US 11,658,330 B2
Battery
Haizu Jin, Ningde (CN); Xiaowen Zhang, Ningde (CN); and Zhenhua Li, Ningde (CN)
Assigned to Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Apr. 29, 2022, as Appl. No. 17/732,571.
Application 17/732,571 is a continuation of application No. 16/433,662, filed on Jun. 6, 2019, granted, now 11,362,364.
Claims priority of application No. CN201811368959 (CN), filed on Nov. 16, 2018.
Prior Publication US 2022/0255114 A1, Aug. 11, 2022
Int. Cl. H01M 10/04 (2006.01); H01M 4/525 (2010.01); H01M 10/0565 (2010.01)
CPC H01M 10/0459 (2013.01) [H01M 4/525 (2013.01); H01M 10/045 (2013.01); H01M 10/0565 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A battery comprising a positive electrode plate, a separator, and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active material coated on at least one surface of the positive electrode current collector, comprising an underlying positive active material layer in contact with the positive electrode current collector and an upper positive active material layer in contact with the underlying positive active material layer and away from the positive electrode current collector; and
wherein the underlying positive active material layer comprises a first positive active material, a first polymer material and a first conductive material, and based on the total weight of the underlying layer positive active material layer, the first positive active material has a content of A % by weight, the first polymer material has a content of B % by weight, and the first conductive material has a content of C % by weight; wherein the first positive active material satisfies 10 wt %≤A %≤60 wt %, the first polymer material satisfies 35 wt %≤B %≤75 wt %, and the first conductive material satisfies 5 wt %≤C %≤25 wt %;
wherein the upper positive active material layer comprises a second positive active material, a second polymer material and a second conductive material, and based on the total weight of the upper positive active material layer, the second positive active material has a content of A′% by weight, the second polymer material has a content of B′% by weight, and the second conductive material has a content of C′% by weight;
wherein A %<A′%, B %>B′%, C %≥C′%;
wherein the first polymer material comprises fluorinated polyolefin and/or chlorinated polyolefin polymer material having a crosslinked structure; and
wherein the first positive active material has a specific surface area (BET) of at most 500 m2/g.