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Battery storage

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MANUFACTURING METHOD FOR HEAT TREATMENT JIG

Publication No.:  EP4671227A1 31/12/2025
Applicant: 
TOKYO YOGYO KK [JP]
TOKYO YOGYO KABUSHIKI KAISHA
KR_20250154437_PA

Absstract of: EP4671227A1

An object is to achieve a manufacturing method of manufacturing a heat treatment jig by using a fired product, which has already been fired, as a raw material. A method of manufacturing a heat treatment jig of the present invention includes: a fired product-derived raw material forming step of forming a fired product-derived raw material by pulverizing a lithium-containing fired product that has Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, and MgO as main components and contains a lithium-containing compound; a fired raw material preparing step of preparing raw materials to be fired, the raw materials to be fired including the fired product-derived raw material that has been obtained in the fired product-derived raw material forming step as part or a whole of raw materials and including Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, and MgO at a predetermined ratio as main components; a kneading step of kneading the raw materials to be fired that have been prepared in the fired raw material preparing step; a molding step of molding the raw materials to be fired that have been kneaded in the kneading step; and a firing step of firing the raw materials to be fired that have been molded in the molding step under predetermined firing conditions.

ELECTRODE PLATE, MANUFACTURING METHOD THEREFOR, AND BATTERY

Publication No.:  EP4672481A1 31/12/2025
Applicant: 
PANASONIC ENERGY CO LTD [JP]
Panasonic Energy Co., Ltd
CN_120693741_PA

Absstract of: EP4672481A1

An electrode plate, which is an example of an embodiment of the present invention, has a core body and a mixture layer formed on the core body, and is provided with an exposed part where the surface of the core body is exposed. The electrode plate has a lead joined to the exposed part, and an identification display part (36) formed on the outer surface of the lead. The identification display part (36) includes at least one of a discolored part and a recess formed on the outer surface of the lead by a melting and solidifying part that penetrates the lead in the thickness direction and reaches the exposed part and joins the lead and the exposed part.

DETERIORATION SUPPRESSION SYSTEM, DETERIORATION SUPPRESSION METHOD, DETERIORATION SUPPRESSION PROGRAM, AND STORAGE MEDIUM HAVING DETERIORATION SUPPRESSION PROGRAM WRITTEN THEREIN

Publication No.:  EP4672548A1 31/12/2025
Applicant: 
PANASONIC IP MAN CO LTD [JP]
Panasonic Intellectual Property Management Co., Ltd
CN_120752825_PA

Absstract of: EP4672548A1

A histogram generation unit generates a histogram of a residence time of a state of charge (SOC) of a battery based on battery data. An actual SOC range calculation unit specifies, as an actual SOC use range, an SOC range that falls within a predetermined appearance probability from the histogram. A recommended SOC range calculation unit calculates a recommended SOC use range in which deterioration is further suppressed than the actual SOC use range while referring to deterioration characteristics of the battery based on the actual SOC use range and a statistical charge and discharge pattern based on the battery data. A charge recommendation degree generation unit generates the charge recommendation degree that increases or decreases in accordance with the SOC of the battery, the charge recommendation degree having a lower limit SOC of the recommended SOC use range as a charge start recommendation value and an upper limit SOC of the recommended SOC use range as a charge end recommendation value.

NEGATIVE ELECTRODE FOR SECONDARY BATTERIES, SECONDARY BATTERY, AND METHOD FOR PRODUCING NEGATIVE ELECTRODE FOR SECONDARY BATTERIES

Publication No.:  EP4672358A1 31/12/2025
Applicant: 
PANASONIC IP MAN CO LTD [JP]
Panasonic Intellectual Property Management Co., Ltd
CN_120513525_A

Absstract of: EP4672358A1

A negative electrode for secondary batteries is provided, the negative electrode being able to be inhibited from swelling.The negative electrode for secondary batteries comprises a negative-electrode current collector and a negative-electrode mix layer disposed on the negative-electrode current collector, and is characterized in that the negative-electrode mix layer comprises a negative-electrode active material, which includes a carbon material and an Si-based material, and an organic compound having a solubility in water of 0.05 g/100 mL or less. The negative electrode is also characterized in that a pore diameter distribution of the negative-electrode mix layer determined by mercury porosimetry has two peaks R1 and R2.

AN IONIC AND ELECTRONIC CONDUCTIVE POLYMERIC MATERIAL FOR BATTERIES

Publication No.:  EP4672359A1 31/12/2025
Applicant: 
CENTRE NAT RECH SCIENT [FR]
UNIV BORDEAUX [FR]
INST POLYTECHNIQUE BORDEAUX [FR]
Centre National de la Recherche Scientifique,
Universit\u00E9 de Bordeaux,
Institut Polytechnique de Bordeaux

Absstract of: EP4672359A1

The present invention relates to batteries, such as lithium, sodium or zinc batteries. In particular, the present invention relates to an electrode material comprising at least one electroactive material and at least one polymeric material. The invention also relates to an electrode comprising said electrode material and to a battery comprising said electrode.The invention is also directed to a method of manufacturing said electrode material, the method comprising at least one step of mixing the polymeric material with the electroactive material, thereby obtaining the electrode material, and optionally at least one step of pouring the obtained electrode material on a current collector.

FIBROUS SILICON-CARBON COMPOSITE MATERIAL AND PREPARATION METHOD THEREFOR

Publication No.:  EP4672371A1 31/12/2025
Applicant: 
SHIDA SHINGWA ADVANCED MAT GROUP CO LTD [CN]
Shida Shingwa Advanced Material Group Co., Ltd
US_2025361603_PA

Absstract of: EP4672371A1

The present invention discloses a fibrous silicon-carbon composite material and a preparation method therefor. The fibrous silicon-carbon composite material includes a core-shell structure, where a core of the core-shell structure includes a porous carbon fiber and nano-silicon, and a shell of the core-shell structure includes an inorganic lithium salt and amorphous carbon. The present invention has a characteristic of high electronic conductivity, and a lithium-ion battery to which the present invention is applied exhibits an excellent rate capability and excellent cycle performance.

PREPARATION METHOD FOR LITHIUM IRON PHOSPHATE CATHODE MATERIAL AND LITHIUM BATTERY

Publication No.:  EP4671201A1 31/12/2025
Applicant: 
HUNAN YUNENG NEW ENERGY BATTERY MAT CO LTD [CN]
Hunan Yuneng New Energy Battery Materials Co., LTD
KR_102791945_B1

Absstract of: EP4671201A1

The present application belongs to the field of lithium battery technology, particularly relating to a preparation method for lithium iron phosphate cathode material and lithium battery. The method comprises: adding lithium source, iron source, phosphorus source, first carbon source, dopant, and dispersant into a solvent according to a preset ratio for mixing and grinding treatment to obtain the first mixture; Drying the first mixture and performing the first sintering in an inert gas atmosphere to obtain the lithium iron phosphate precursor; Adding borohydride, deionized water, second carbon source, and dispersant to the lithium iron phosphate precursor for pretreatment to obtain the lithium iron phosphate precursor mixture; After mixing, grinding, and drying the lithium iron phosphate precursor mixture, performing a second sintering in an inert gas atmosphere to obtain a coated doped type lithium iron phosphate cathode material.

BATTERY CELL, BATTERY, AND ELECTRIC DEVICE

Publication No.:  EP4672431A1 31/12/2025
Applicant: 
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD [CN]
Contemporary Amperex Technology Co., Limited
CN_118782980_PA

Absstract of: EP4672431A1

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), and an electric device. The electric device comprises a battery (100). The battery (100) comprises a battery cell (10). The battery cell (10) comprises an electrode assembly (11) and a heat conduction member (13). The electrode assembly (11) comprises a main body (111) and tabs (112) arranged at one end or two opposite ends of the main body (111). The heat conduction member (13) is at least partially arranged at the end of the main body (111) provided with the tabs (112). By using the technical solution, the heat conduction member (13) implements the heat conduction at the end of the main body (111) close to the tabs (112) in a first direction (Z), so that the problem of the heat at the end of the main body (111) close to the tabs (112) being hard to be conducted out can be effectively mitigated, thereby facilitating implementation of the effect of uniform heat distribution inside the main body (111).

FUSE DEVICE AND BATTERY MODULE

Publication No.:  EP4672294A1 31/12/2025
Applicant: 
AESC JAPAN LTD [JP]
AESC Japan Ltd
CN_120660165_PA

Absstract of: EP4672294A1

A first fuse device (40A) includes a narrow portion (414A) that functions as a fuse, and a first wide portion (412A) electrically connected to the narrow portion (414A) and having a cross-sectional area greater than the cross-sectional area of the narrow portion (414A). A first curve (404A) is provided from the outer edge of the narrow portion (414A) to the outer edge of the first wide portion (412A).

SEALED BATTERY

Publication No.:  EP4672477A1 31/12/2025
Applicant: 
PANASONIC ENERGY CO LTD [JP]
Panasonic Energy Co., Ltd
CN_120615256_PA

Absstract of: EP4672477A1

In the present invention, a cylindrical battery (10) comprises: an electrode (14); an electrolyte; a bottomed cylindrical outer casing can (16) that accommodates the electrode (14) and the electrolyte; a seal (17) that closes off an opening of the outer casing can (16); and an upper insulating plate (18) that is disposed in between the electrode (14) and the seal (17). The seal (17) is provided with a safety valve. The upper insulating plate (18) includes a base material (50) having a through hole (60), and a film (53) that blocks the through hole (60). The film (53) is constituted from a thermoplastic resin that melts at a lower temperature than the base material (50) does.

PRESSING DEVICE FOR A BATTERY CELL STACK

Publication No.:  EP4672391A1 31/12/2025
Applicant: 
IKERLAN S COOP [ES]
Ikerlan, S. Coop

Absstract of: EP4672391A1

Pressing device for a battery cell stack (10) comprising a plurality of prismatic or pouch-type battery cells (11), the pressing device (1) comprising a first pressure plate (2) and a second pressure plate (3), and a first side structure (4) and a second side structure (5) configured to be fixed to the first and the second pressure plate (2, 3). The first side structure (4) and the second side structure (5) expand and are compressed in the stacking direction with an increase and a decrease in the thickness of the battery cells (11) respectively, and comprise a plurality of deformable elements (7) which for each width of the first side structure (4) and the second side structure (5) behave as deformable elements of positive stiffness, negative stiffness, or zero stiffness.

ELECTROCHEMICAL ENERGY STORAGE ELEMENT AND METHOD OF MANUFACTURE

Publication No.:  EP4672288A1 31/12/2025
Applicant: 
VARTA MICROBATTERY GMBH [DE]
VARTA Microbattery GmbH

Absstract of: EP4672288A1

Ein elektrochemisches Energiespeicherelement 100 umfasst ein einen Innenraum 103 umschließendes Gehäuse mit einem Gehäuseboden 104 und einem Gehäusedeckel 102, die jeweils eine in den Innenraum 103 weisende Innenseite und eine Außenseite aufweisen, und einem einwandigen Gehäusemantel 105. In dem Innenraum 103 angeordnet sind mindestens eine positive und mindestens eine negative Elektrode, die über einen Elektrolyten miteinander verbunden sind. Der Gehäuseboden 104 oder der Gehäusedeckel 102 weisen ein Loch 107 auf. Auf der Innenseite des Gehäusebodens 104 oder des Gehäusedeckels mit dem Loch 107 ist eine Isolierschicht 108 um das Loch 107 herum angeordnet. Ein Metallplättchen 109, das an dieser Innenseite, nur getrennt durch die Isolierschicht 108, anliegt, bildet einen Lochboden, der das Loch 107 auf der Innenseite verschließt. Ein Stromleiter 110, der mit einer der Elektroden elektrisch verbunden ist, ist an die dem Loch 107 abgewandte Seite des Metallplättchens 109 angebunden. Neben dem Energiespeicherelement 100 werden auch Verfahren zu seiner Herstellung beschrieben.

BATTERY MODULE

Publication No.:  EP4672546A1 31/12/2025
Applicant: 
NICOVENTURES TRADING LTD [GB]
Nicoventures Trading Limited

Absstract of: EP4672546A1

A battery module and an aerosol provision device comprising such a battery module is described. The battery module includes a battery and one or more electric circuit that are responsive, at least in part, to an input, to cause a persistent change in the one or more circuits to prevent charging of the battery and/or to prevent transfer of electrical power from the battery to the aerosol provision device.

BATTERY MODULE

Publication No.:  EP4672545A1 31/12/2025
Applicant: 
NICOVENTURES TRADING LTD [GB]
Nicoventures Trading Limited

Absstract of: EP4672545A1

A battery module is described that is connectable to an aerosol provision device for generating aerosol. The battery module comprises a battery (for providing electrical power to the aerosol provision device), a data storage medium, and a controller (configured to obtain and store battery data in the data storage medium).

PREPARATION METHOD FOR ULTRA-HIGH COMPACTED LITHIUM IRON PHOSPHATE CATHODE MATERIAL AND LITHIUM BATTERY

Publication No.:  EP4671200A1 31/12/2025
Applicant: 
HUNAN YUNENG NEW ENERGY BATTERY MAT CO LTD [CN]
Hunan Yuneng New Energy Battery Materials Co., LTD
KR_102791946_B1

Absstract of: EP4671200A1

The present application belongs to the field of lithium battery technology, particularly relating to a preparation method for ultra-high compacted lithium iron phosphate cathode material and lithium battery. The method comprises: obtaining an iron-containing precursor based on iron phosphate and dispersant; Mixing the iron-containing precursor, lithium source, phosphorus source, and first carbon source for first sintering to obtain the first precursor mixture and grinding to the first preset particle size to obtain the first precursor; Mixing the iron-containing precursor, lithium source, phosphorus source, and second carbon source for second sintering to obtain the second precursor mixture and grinding to the second preset particle size to obtain the second precursor; Mixing the first precursor, second precursor, and third carbon source and performing a third sintering to obtain the first lithium iron phosphate cathode material.

BATTERY CELL, BATTERY, AND ELECTRICAL DEVICE

Publication No.:  EP4672355A1 31/12/2025
Applicant: 
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD [CN]
Contemporary Amperex Technology Co., Limited
DE_212023000439_PA

Absstract of: EP4672355A1

The present application relates to the technical field of lithium batteries, and in particular to, a battery cell, a battery, and an electrical device. A positive electrode active material of the battery cell comprises a first lithium-nickel-cobalt-manganese oxide and a second lithium-nickel-cobalt-manganese oxide. A negative electrode active material comprises a silicon-based material and a carbon-based material. A molar content of nickel element in the second lithium-nickel-cobalt-manganese oxide is greater than that of nickel element in the first lithium-nickel-cobalt-manganese oxide among all transition metal elements, wherein the molar content of the nickel element in the second lithium-nickel-cobalt-manganese oxide among all transition metal elements is greater than or equal to 0.8. With the second lithium-nickel-cobalt-manganese oxide with a high nickel element content provided in the positive electrode active material according to the present application, during charging, voids created by shrinkage of a lattice of the second lithium-nickel-cobalt-manganese oxide may store an electrolytic solution squeezed out by expansion of negative electrode silicon, facilitating reflux of the electrolytic solution during a next charge, reducing lithium plating, and improving cycling performance of the battery cell.

HEAT INSULATION MATERIAL, PREPARATION METHOD THEREFOR, HEAT INSULATION MEMBER, HEAT INSULATION PRODUCT, BATTERY AND ELECTRICAL APPARATUS

Publication No.:  EP4671460A1 31/12/2025
Applicant: 
GONGYI VAN RES INNOVATION COMPOSITE MATERIALS CO LTD [CN]
Gongyi Van-Research Innovation Composite Materials Co., Ltd
KR_20250151383_PA

Absstract of: EP4671460A1

A heat insulation material, a preparation method therefor, a heat insulation member, a heat insulation product, a battery and an electrical apparatus. The heat insulation material may comprise heat insulation powder and reinforced phase fibers, the heat insulation powder being loaded on the surfaces of the reinforced phase fibers; and, in parts by mass, the heat insulation powder may be 25-120 parts, and the reinforced phase fibers may be 0.5-40 parts. The heat insulation material has high compactness, and obviously ameliorates the powder falling phenomenon; and moreover, loading the heat insulation powder on the surfaces of the reinforced phase fibers can reduce the agglomerating space and area of the heat insulation powder, thus reducing the agglomeration of the heat insulation powder, and effectively improving the uniformity of the overall performance of the heat insulation material.

ENERGY STORAGE THERMAL MANAGEMENT SYSTEM AND METHOD

Publication No.:  EP4672430A1 31/12/2025
Applicant: 
SUNGROW POWER SUPPLY CO LTD [CN]
Sungrow Power Supply Co., Ltd
AU_2023432368_PA

Absstract of: EP4672430A1

Provided in the present invention are an energy storage thermal management system and method. The energy storage thermal management system comprises a controller, a battery, a power electronic device, and a shunting apparatus. The controller determines the operating mode of the energy storage management system, the operating mode being any one of a preset first mode, second mode and third mode; and according to the operating mode of the energy storage thermal management system, controls a corresponding path of the shunting apparatus to be turned on, so that in the first mode, the battery performs heat exchange in a compression cooling mode and the power electronic device performs heat exchange in a liquid-cooled heat exchange mode; in the second mode, the battery and the power electronic device both perform heat exchange in the liquid-cooled heat exchange mode; and in the third mode, the power electronic device and/or an electric heater perform heat exchange with the battery. The present invention can select different heat exchange modes for the battery and the power electronic device according to different operating modes, so as to meet the heat dissipation requirements of the battery and the power electronic device.

META-ARAMID POLYMER HAVING GRID STRUCTURE, PREPARATION METHOD THEREFOR, AND USE THEREOF

Publication No.:  EP4671301A1 31/12/2025
Applicant: 
YANTAI TAYHO ADVANCED MATERIALS RES INSTITUTE CO LTD [CN]
Yantai Tayho Advanced Materials Research Institute Co., Ltd
JP_2025522207_PA

Absstract of: EP4671301A1

The present invention discloses a meta-aramid polymer with a grid structure, and a preparation method therefor and use thereof, and belongs to the technical field of lithium battery materials. In the process of forming the meta-aramid polymer, alkyl is introduced among macromolecules through alkylation, such that adjacent molecular chains are linked by a chemical bond so as to form a grid structure. A coating slurry prepared from the meta-aramid polymer with a grid structure, a pore-forming agent and a cosolvent are coated on the surface of a polyolefin porous separator so as to obtain a high-performance lithium battery coated separator. Compared with a coated separator prepared by a traditional method, the coated separator prepared by the present invention has higher heat resistance, thermal shrinkage resistance and puncture strength, has better wettability with an electrolyte, and thus can prolong a cycle life of a battery. The coated separator of the meta-aramid with a grid structure can further improve the oxidation resistance, is beneficial to realizing high potential and improves energy density.

ALL-SOLID BATTERY COMPRISING THROUGH HOLE

Publication No.:  EP4672382A1 31/12/2025
Applicant: 
BELENOS CLEAN POWER HOLDING AG [CH]
Belenos Clean Power Holding AG
CN_121216001_PA

Absstract of: EP4672382A1

The present invention relates to an all-solid battery comprising: a casing comprising a tubular body comprising a first through hole, an outer tubular surface and an inner tubular surface defining an internal volume of the tubular body, first and planar case portions each comprising a through hole arranged to match the first through hole of the tubular body; a first and second metallic conductors comprising a hollow tubular body and provided coaxially within the internal volume of the tubular body of the casing and provided adjacent to the outer tubular surface and the inner tubular surface of the tubular body of the casing, respectively; a first cell unit comprising a first cathode current collector, a first cathode adjacent to the cathode current collector, a first solid state electrolyte (SSE) adjacent to the first cathode, optionally a first anode adjacent to the first SSE, and a first anode current collector adjacent to the first anode, wherein each component of the first cell unit comprises a hollow tubular body and is provided coaxially within the internal volume of the tubular body of the casing.

DEVICE AND METHOD FOR EXCHANGING VEHICLE FLUIDS

Publication No.:  EP4671512A1 31/12/2025
Applicant: 
VOLVO TRUCK CORP [SE]
VOLVO TRUCK CORPORATION

Absstract of: EP4671512A1

A device (1) for exchanging vehicle fluids (111, 121), comprising- a first fluid port (10) to connect to a first assembly (110) of a vehicle (100), the first assembly (110) containing a first vehicle fluid (111),- a second fluid port (20) to connect to a second assembly (120) of the vehicle (100), the second assembly (120) containing a second vehicle fluid (121),- a first fluid control arrangement (12) configured to selectively permit fluid flow from the first assembly (110) to the first fluid port (10) and to selectively permit fluid flow from the first fluid port (10) to the first assembly (110), and- a second fluid control arrangement (22) configured to selectively permit fluid flow from the second assembly (120) to the second fluid port (20) and to selectively permit fluid flow from the second fluid port (20) to the second assembly (120).

PRINTING METHOD FOR PREVENTING CORROSION, AND BATTERY CELL MANUFACTURED USING SAME

Publication No.:  EP4672444A1 31/12/2025
Applicant: 
LG ENERGY SOLUTION LTD [KR]
LG Energy Solution, Ltd
CN_121241470_PA

Absstract of: EP4672444A1

The present invention provides a method for printing a coating material for corrosion prevention and a battery cell manufactured using the same. According to the method, a coating material may be locally printed on a minimum area where a coating for corrosion prevention is required at the front end of a crimped portion of a battery can having a fractured surface. The coating material is a thermosetting resin or a thermosetting sealant, and may be cured by the heat of a subsequent cell activation process without a separate curing process. The coating material may be printed on the front end of the crimped portion by reverse-transcribing (printing) onto the local area a coating material having a predetermined pattern transcribed on the surface of a flexible pad.

ENERGY STORAGE APPARATUS AND ENERGY STORAGE APPARATUS OPEN CIRCUIT CONTROL METHOD

Publication No.:  EP4672550A1 31/12/2025
Applicant: 
ALPHA ESS CO LTD [CN]
Alpha Ess Co., Ltd
AU_2024279773_PA

Absstract of: EP4672550A1

The present application provides an energy storage device and a circuit breaking control method thereof. The energy storage device includes a main circuit formed by multiple battery modules connected in series in sequence, and the energy storage device comprises a detection module, a circuit breaking protection module connected in series with the main circuit of the energy storage device, and a circuit breaking detection module. The detection module is configured to detect a working status of the energy storage device and turn on the circuit breaking protection module when detecting that the energy storage device fails. The circuit breaking protection module is configured to output circuit breaking drive power after being turned on, and drive a circuit breaker in the main circuit of the energy storage device to break based on the circuit breaking drive power, to disconnect the connection circuit between the energy storage device and an external device. The circuit breaking detection module is configured to perform sampling current detection on the circuit breaking protection module periodically, and output a shunt failure signal when a sampling current does not meet a preset condition.

NON-ROUND PLUG AND SEAL WITH RADIAL OFFSET CAPABILITIES

Publication No.:  EP4671591A1 31/12/2025
Applicant: 
FREUDENBERG NOK GENERAL PARTNERSHIP [US]
Freudenberg-NOK General Partnership
US_12442473_PA

Absstract of: EP4671591A1

A seal (10) for connecting between oval cross-section pipe sections includes an oval shaped tubular insert (16) having two flat wall sections connected to one another by two end curved sections. The oval shaped tubular insert has a pair of ends with a passage extending through the pair of ends. An elastomeric over-mold (14) is provided on an exterior of the oval shaped tubular insert. The elastomeric over-mold includes a pair of raised seal beads (22) each surrounding a respective one of the pair of ends. The pair of raised beads have a first bead thickness (Y) in a radial direction along the two flat wall sections and a gradually increasing bead thickness (X) from the ends of the flat wall sections to a center of the two end curved sections.

PREPARATION METHOD FOR SILICON-CARBON COMPOSITE MATERIAL AND SILICON-CARBON COMPOSITE MATERIAL

Nº publicación: EP4672362A1 31/12/2025

Applicant:

SHIDA SHINGWA ADVANCED MAT GROUP CO LTD [CN]
SHINGHWA ADVANCED MATERIAL TECH MEISHAN CO LTD [CN]
SHINGHWA ADVANCED MATERIAL TECH LIANJIANG CO LTD [CN]
Shida Shingwa Advanced Material Group Co., Ltd,
Shinghwa Advanced Material Technology (Meishan) Co., Ltd,
Shinghwa Advanced Material Technology (Lianjiang) Co., Ltd

US_2025340443_PA

Absstract of: EP4672362A1

The present invention discloses a preparation method of a silicon-carbon composite material and a silicon-carbon composite material. The preparation method includes: preparing a porous carbon-doped porous copper complex, and depositing nano-silicon on the porous carbon-doped porous copper complex according to a silane pyrolysis method, to obtain the silicon-carbon composite material. The preparation of the porous carbon-doped porous copper complex includes at least operation steps of: S11). uniformly mixing carbon disulfide, activated carbon, and a binder, and pressing an obtained mixture into copper foam to form a sheet-like structure; and S12). transferring the sheet-like structure obtained in the step S11) to a carbonization apparatus, and performing heating and carbonization in an inert atmosphere to obtain the porous carbon-doped porous copper complex. In the present invention, the following obvious defects and problems are significantly alleviated: The nano-silicon cannot be completely deposited in porous carbon when only pure porous carbon is used as a substrate for depositing the nano-silicon, thus affecting expansion and high-temperature preservation performance of the silicon-carbon composite material due to exposure of the nano-silicon; and the use of a pure porous metal for depositing the nano-silicon leads to poor consistency and low efficiency.

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