US 11,942,621 B2
Positive electrode coating liquid, positive electrode precursor, and nonaqueous lithium electric storage element
Kazuteru Umetsu, Tokyo (JP); Keita Kusuzaka, Tokyo (JP); Yuichiro Hirakawa, Tokyo (JP); and Nobuhiro Okada, Tokyo (JP)
Assigned to Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
Appl. No. 16/644,295
Filed by Asahi Kasei Kabushiki Kaisha, Tokyo (JP)
PCT Filed Nov. 13, 2018, PCT No. PCT/JP2018/042002
§ 371(c)(1), (2) Date Mar. 4, 2020,
PCT Pub. No. WO2019/098197, PCT Pub. Date May 23, 2019.
Claims priority of application No. 2017-219289 (JP), filed on Nov. 14, 2017; and application No. 2017-219302 (JP), filed on Nov. 14, 2017.
Prior Publication US 2020/0194775 A1, Jun. 18, 2020
Int. Cl. H01M 4/131 (2010.01); H01M 4/02 (2006.01); H01M 4/133 (2010.01); H01M 4/1391 (2010.01); H01M 4/505 (2010.01); H01M 4/66 (2006.01)
CPC H01M 4/131 (2013.01) [H01M 4/133 (2013.01); H01M 4/1391 (2013.01); H01M 4/505 (2013.01); H01M 4/66 (2013.01); H01M 2004/028 (2013.01)] 11 Claims
 
1. A positive electrode precursor having a current collector and a positive electrode active material layer disposed on the current collector, wherein
the positive electrode active material layer comprises all of a carbon material, lithium transition metal oxide, and an alkali metal compound, a weight proportion A1 of the carbon material in the positive electrode active material layer accounts for 50% by weight or greater and 65% by weight or less, a weight proportion A2 of the lithium transition metal oxide in the positive electrode active material layer accounts for 10% by weight or greater and 30% by weight or less, a weight proportion A3 of the alkali metal compound in the positive electrode active material layer accounts for 24.6% by weight or greater and 50% by weight or less,
A2/A1 is 0.19 or greater and 1.10 or less, A1/A3 is 0.65 or greater and 2.88 or less, and the positive electrode active material layer has a peel strength of 0.02 N/cm or greater and 3.00 N/cm or less,
the carbon material in the positive electrode active material layer is activated carbon material, and
the alkali metal compound is at least one selected from the group consisting of lithium carbonate, sodium carbonate, and potassium carbonate.