	US 12,394,818 B2
	Process for preparing a composite anode for lithium ion cell
Aravamuthan S, Thiruvananthapuram (IN); Td Mercy, Thiruvananthapuram (IN); and John Bibin, Thiruvananthapuram (IN)
Appl. No. 17/636,363
Filed by INDIAN SPACE RESEARCH ORGANISATION, Bangalore (IN)
PCT Filed Jul. 7, 2020, PCT No. PCT/IN2020/050591 § 371(c)(1), (2) Date Feb. 18, 2022, PCT Pub. No. WO2021/033195, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 201941033431 (IN), filed on Aug. 20, 2019.
Prior Publication US 2022/0294005 A1, Sep. 15, 2022
Int. Cl. H01M 10/0525 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/583 (2010.01); H01M 4/62 (2006.01); H01M 4/66 (2006.01); H01M 4/02 (2006.01)

CPC H01M 10/0525 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0435 (2013.01); H01M 4/364 (2013.01); H01M 4/583 (2013.01); H01M 4/623 (2013.01); H01M 4/661 (2013.01); H01M 2004/027 (2013.01)]

16 Claims

1. A process for preparing a composite anode for a lithium ion cell comprising the steps of:

i. forming an anode slurry in a planetary mixing machine by mixing active materials, a binder and a solvent;

ii. coating the slurry over a copper foil substrate in a coating machine at a speed of 0.3-1.0 m/min; and

iii. calendering of the anode in a calendering machine at a temperature of 50-150° C.,

wherein the active material is a mixture of spherical graphite and flake graphite, and the binder comprises: Polyvinylidene fluoride, the organic solvent is 1-methyl-2-pyrrolidinone, the amount of the binder is in the range of 1 to 15 wt % based on the total amount of the anode slurry, and the amount of the organic solvent is in the range of 45 to 55 wt % based on the total amount of the anode slurry; comprises forming the anode slurry of viscosity in the 2000-15000 cps range by dry mixing the active materials, followed by addition of binder solutions and then addition of the solvents at different time intervals.