US 12,476,257 B2
Positive plate, electrochemical device comprising same and apparatus thereof
Jing Li, Ningde (CN); Qingrui Xue, Ningde (CN); Wei Li, Ningde (CN); Zige Zhang, Ningde (CN); Yang Zhang, Ningde (CN); and Xianwei Yang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Appl. No. 17/620,417
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
PCT Filed Dec. 27, 2019, PCT No. PCT/CN2019/129363
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2021/000547, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 201910585849.2 (CN), filed on Jul. 1, 2019.
Prior Publication US 2022/0352522 A1, Nov. 3, 2022
Int. Cl. H01M 4/66 (2006.01); H01M 4/02 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/42 (2006.01)
CPC H01M 4/667 (2013.01) [H01M 4/621 (2013.01); H01M 4/623 (2013.01); H01M 4/625 (2013.01); H01M 4/661 (2013.01); H01M 4/662 (2013.01); H01M 4/664 (2013.01); H01M 10/0525 (2013.01); H01M 10/4235 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A positive plate comprising a current collector and an electrode active material layer arranged on at least one surface of the current collector, wherein:
the current collector comprises a support layer and a conductive layer arranged on at least one surface of the support layer, a single-sided thickness D2 of the conductive layer satisfies: 30 nm≤D2≤3 μm, a material of the conductive layer is aluminum or aluminum alloy, a density of the conductive layer is 2.5 g/cm3-2.8 g/cm3;
the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, the binder in the electrode active material layer has an uneven distribution in a thickness direction of the electrode active material layer, the electrode active material layer is divided in the thickness direction into an inner region and an outer region, and based on a total weight of the electrode active material layer, a weight percentage of the binder in the inner region of the electrode active material layer is higher than a weight percentage of the binder in the outer region of the electrode active material layer,
wherein viewed from a width direction of a coated surface of the positive plate, the electrode active material layer or the outer region of the electrode active material layer comprises 2n+1 regions based on a compaction density, the 2n+1 regions comprises a middle region and at least two side regions, and a compaction density of the at least two side regions is lower than a compaction density of the middle region by 5% to 30% of the compaction density of the two side regions, a ratio of a width of the middle region to a sum of a width of each one of the 2n+1 regions is 30% to 70%.