US 12,191,490 B2
Nonaqueous electrolyte secondary battery
Takao Tsuda, Osaka (JP); Takuya Shinomiya, Osaka (JP); Takamitsu Tashita, Tokushima (JP); and Fumikazu Mizukoshi, Osaka (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/604,334
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Apr. 14, 2020, PCT No. PCT/JP2020/016401
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2020/218083, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-083098 (JP), filed on Apr. 24, 2019.
Prior Publication US 2022/0216475 A1, Jul. 7, 2022
Int. Cl. H01M 4/583 (2010.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/583 (2013.01) [H01M 4/364 (2013.01); H01M 4/622 (2013.01); H01M 2004/027 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising:
a negative electrode comprising a negative electrode collector, and a negative electrode mixture layer disposed on a surface of the negative electrode collector, wherein
the negative electrode mixture layer contains graphite particles A and graphite particles B as a negative electrode active material and a rubber binder as a binder,
the graphite particles A have an internal porosity of 5% or less, and the graphite particles B have an internal porosity of 8% to 20%,
the negative electrode mixture layer includes two equally divided half regions in a thickness direction of the negative electrode mixture layer, and the graphite particles A are contained in a half region of the negative electrode mixture layer adjacent to an outer surface of the negative electrode mixture layer in a greater amount than in a half region of the negative electrode mixture layer adjacent to the negative electrode collector, and
the rubber binder is contained in the half region adjacent to the negative electrode collector in an amount of 90 mass % to 100 mass % of all of the rubber binder contained in the negative electrode mixture layer.