US 12,283,695 B2
Negative electrode material for lithium ion secondary battery, method of manufacturing negative electrode material for lithium ion secondary battery, negative electrode material slurry for lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
Yoshiyuki Matsumoto, Tokyo (JP); Takeshi Masayoshi, Tokyo (JP); Takashi Sakamoto, Tokyo (JP); and Hideyuki Tsuchiya, Tokyo (JP)
Assigned to RESONAC CORPORATION, Tokyo (JP)
Appl. No. 17/639,515
Filed by Showa Denko Materials Co., Ltd., Tokyo (JP)
PCT Filed Sep. 2, 2019, PCT No. PCT/JP2019/034414
§ 371(c)(1), (2) Date Mar. 1, 2022,
PCT Pub. No. WO2021/044482, PCT Pub. Date Mar. 11, 2021.
Prior Publication US 2022/0293942 A1, Sep. 15, 2022
Int. Cl. H01M 4/583 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/583 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0471 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A negative electrode material for a lithium ion secondary battery, the negative electrode material comprising composite particles, each of the composite particles comprising: a spherical graphite particle; and flat graphite particles that are gathered or bound together such that the flat graphite particles have non-parallel orientation planes, wherein the composite particles satisfy the following conditions (1) and (2):
(1) a pore volume in a range of a pore diameter of from 0.10 to 8.00 μm obtained by a mercury intrusion method is from 0.20 to 1.00 mL/g; and
(2) in a log differential pore volume distribution obtained by the mercury intrusion method, wherein a peak is defined as a point at which a slope the log differential pore volume distribution changes from a positive value to a negative value, at least two peaks appear in a range of a pore diameter of from 0.10 to 8.00 μm, the at least two peaks including a first peak P1 and a second peak P2 at a higher diameter than the first peak P1, wherein:
a pore diameter corresponding to a maximum log differential pore volume of the first peak P1 is from 0.10 to less than 4.00 μm, and
a pore diameter corresponding to a maximum log differential pore volume of the second peak P2 is from 4.50 to 7.00 μm.