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  • 专利标题:   Secondary battery for use as high voltage, high energy density rechargeable battery, has cathode film layer comprising first cathode active material, where first active material comprises first artificial graphite.
  • 专利号:   WO2022077371-A1, CN114788044-A, IN202217036434-A, KR2022118511-A, EP4064385-A1, US2022328831-A1, EP4064385-A4, JP2023511881-W, US11631852-B2
  • 发明人:   LI E, KANG M, DENG B, HE L, REALING, CANMONG, DENBAI I, BING W
  • 专利权人:   CONTEMPORARY AMPEREX TECHNOLOGY LTD, NINGDE CONTEMPORARY AMPEREX TECHNOLOGY, CONTEMPORARY AMPEREX TECHNOLOGY LTD, CONTEMPORARY AMPEREX TECHNOLOGY LTD, CONTEMPORARY AMPEREX TECHNOLOGY LTD
  • 国际专利分类:   H01M004/133, H01M004/587, H01M010/052, H01M004/36, H01M010/058, H01M010/0525, H01M004/02, H01M004/583, H01M050/209, H01M004/62, H01M004/1393, H01M050/204, H01M004/66, H01M004/58
  • 专利详细信息:   WO2022077371-A1 21 Apr 2022 H01M-004/133 202243 Pages: 41 Chinese
  • 申请详细信息:   WO2022077371-A1 WOCN121264 15 Oct 2020
  • 优先权号:   CN80084914, EP957150, JP543793, WOCN121264, CN80084914, IN17036434, US853229, KR724936

▎ 摘　　要

NOVELTY - The secondary battery has a multi-layer structure-type negative pole piece (10) that sequentially includes a negative electrode current collector (101), a base coating layer (102) and a negative electrode film layer. The negative electrode film layer includes a first negative electrode film layer (103) and a second negative electrode film layer (104). The first negative electrode film layer is located between base coating layer and second negative electrode film layer. The first negative electrode film layer includes a first negative electrode active material. The first negative electrode active material includes a first artificial graphite. The at least a portion of the particles in first artificial graphite are secondary particles. The number ratio set as A of secondary particles in the total number of particles of first negative electrode active material satisfies the equation A greater than or equal to 50 percent. The base coating layer contains a conductive agent and a binder. USE - Secondary battery for battery module used in battery pack and device (all claimed). ADVANTAGE - The secondary battery has high energy density, good fast charging performance and cycle performance, and long cycle life. DETAILED DESCRIPTION - The conductive agent contains a conductive carbon material and optionally includes at least one of acetylene black, conductive carbon black, kojen black, carbon nanotubes, carbon fiber and graphene. The binder includes at least one of the modified compound of butadiene styrene rubber (SBR), polyvinylidene fluoride (PVDF), copolymer of vinylidene fluoride, polystyrene, polyacrylic acid, olytetrafluoroethylene, polyacrylonitrile, polyimide, polyurethane, polyvinyl alcohol, polyvinyl butyral (PVB), polyacrylate, acrylic acid-acrylonitrile copolymer, ethylene-vinyl acetate (EVA) copolymer, and acrylate-acrylonitrile copolymer. An INDEPENDENT CLAIM is included for a preparation method of a secondary battery. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the negative pole piece in a secondary battery. Negative pole piece (10) Negative electrode current collector (101) Base coating layer (102) First negative electrode film layer (103) Second negative electrode film layer (104)