US 12,322,802 B2
Negative electrode for lithium ion secondary battery, and lithium ion secondary battery
Yuji Oura, Osaka (JP); Kazuhiro Yoshii, Osaka (JP); and Yuta Kuroda, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/763,021
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jul. 21, 2020, PCT No. PCT/JP2020/028213
§ 371(c)(1), (2) Date Mar. 23, 2022,
PCT Pub. No. WO2021/059705, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-177955 (JP), filed on Sep. 27, 2019.
Prior Publication US 2022/0344659 A1, Oct. 27, 2022
Int. Cl. H01M 4/583 (2010.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 4/40 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/583 (2013.01) [H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/405 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a negative electrode electricity collector; and
a negative electrode mixture layer formed over the negative electrode electricity collector, wherein
the negative electrode mixture layer includes a first layer disposed over the negative electrode electricity collector, and a second layer disposed over the first layer,
the second layer includes graphite particles A having a particle internal porosity of 10% or lower, and the first layer includes graphite particles B having a particle internal porosity of greater than 10%,
a water contact angle of the second layer is 50° or lower, and
a volume ratio of the graphite particles A in the second layer with respect to a total volume of the second layer is 29 volume % or greater.