US 12,438,199 B2
Positive electrode plate and electrochemical device
Haizu Jin, Ningde (CN); Xiaowen Zhang, Ningde (CN); and Zhenhua Li, Ningde (CN)
Assigned to Contemporary Amperex Technology (Hong Kong) Limited, Hong Kong (CN)
Appl. No. 17/056,479
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
PCT Filed Nov. 15, 2019, PCT No. PCT/CN2019/118827
§ 371(c)(1), (2) Date Nov. 18, 2020,
PCT Pub. No. WO2020/098788, PCT Pub. Date May 22, 2020.
Claims priority of application No. 201811371592.2 (CN), filed on Nov. 16, 2018.
Prior Publication US 2021/0367280 A1, Nov. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/42 (2006.01); H01G 11/28 (2013.01); H01M 4/02 (2006.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 10/4235 (2013.01) [H01G 11/28 (2013.01); H01M 4/625 (2013.01); H01M 4/667 (2013.01); H01M 4/668 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01); H01M 2200/106 (2013.01); H01M 2220/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A positive electrode plate comprising a current collector, a positive active material layer and a safety coating disposed between the current collector and the positive active material layer, the safety coating comprising a polymer matrix, a conductive material and an inorganic filler, wherein the polymer matrix is selected from at least one of fluorinated polyolefin or chlorinated polyolefin having a crosslinked structure and a weight ratio of the polymer matrix to the conductive material is 2 or more,
wherein an operating temperature range of the safety coating is from 80° C. to 160° C.,
wherein a weight ratio of a crosslinking agent to the polymer matrix is from 0.01% to 5%,
wherein the inorganic filler is an inorganic salt modified with a conductive carbon coating, and wherein the inorganic salt is at least one of lithium iron phosphate, lithium titanate, lithium cobalt oxide, lithium nickel manganese cobalt oxide, lithium nickel manganese aluminium oxide, lithium vanadium phosphate, lithium cobalt phosphate, lithium manganese phosphate, lithium manganese iron phosphate, lithium iron silicate, lithium vanadium silicate, lithium cobalt silicate, lithium manganese silicate, spinel lithium manganese, or spinel lithium nickel manganese oxide.