US 11,942,641 B2
Method for producing carbonaceous substance-coated graphite particles
Ryuta Haga, Tokyo (JP); Motoharu Obika, Tokyo (JP); Kunihiko Eguchi, Tokyo (JP); Yoshikazu Kobayashi, Tokyo (JP); and Masakatsu Asami, Tokyo (JP)
Assigned to JFE Chemical Corporation, Tokyo (JP); and Sumitomo Bakelite Co., Ltd., Tokyo (JP)
Appl. No. 17/430,430
Filed by JFE CHEMICAL CORPORATION, Tokyo (JP); and SUMITOMO BAKELITE CO., LTD., Tokyo (JP)
PCT Filed Nov. 9, 2020, PCT No. PCT/JP2020/041721
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2021/260964, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-110143 (JP), filed on Jun. 26, 2020.
Prior Publication US 2023/0107067 A1, Apr. 6, 2023
Int. Cl. H01M 4/583 (2010.01); H01M 4/04 (2006.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/583 (2013.01) [H01M 4/0471 (2013.01); H01M 4/625 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for producing carbonaceous substance-coated graphite particles, the method comprising:
obtaining resin-adhered graphite particles by causing a modified novolac-type phenolic resin to adhere to graphite particles; and
coating at least part of surfaces of the graphite particles with a carbonaceous coating by heating the resin-adhered graphite particles in a non-oxidizing atmosphere at 900 to 1,500° C. to carbonize the modified novolac-type phenolic resin,
wherein arylene groups having hydroxy groups account for 5 to 95 mol % of arylene groups constituting the modified novolac-type phenolic resin, and
wherein in the carbonaceous substance-coated graphite particles,
an amount of carbonaceous coating is in a range of 0.1 to 15.0 parts of mass, with respect to 100 parts of mass of graphite particle,
a particle diameter D50 is 3.0 to 20.0 μm,
a specific surface area determined by BET method is 4.0 to 15.0 m2/g,
a pore specific surface area SAa of pores having pore sizes of 1 to 4 nm determined by BJH method is 1.85 to 12.50 m2/g, and
a ratio of a pore specific surface area SAb of pores having pore sizes of 4 to 150 nm determined by BJH method to the pore specific surface area SAa (SAb/SAa) is 0.20 to 1.29.