US 11,916,204 B2
Method of producing lithium-ion battery
Makoto Kubo, Kasai (JP); Kazunori Donoue, Kobe (JP); and Shinya Miyazaki, Tokushima (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Oct. 13, 2021, as Appl. No. 17/499,865.
Claims priority of application No. 2020-173948 (JP), filed on Oct. 15, 2020.
Prior Publication US 2022/0123379 A1, Apr. 21, 2022
Int. Cl. H01M 10/44 (2006.01); H01M 10/04 (2006.01); H01M 50/609 (2021.01); H01M 10/0525 (2010.01)
CPC H01M 10/446 (2013.01) [H01M 10/04 (2013.01); H01M 10/0525 (2013.01); H01M 50/609 (2021.01)] 5 Claims
OG exemplary drawing
 
1. A method of producing a lithium-ion battery, comprising:
(A) injecting an electrolyte solution into a lithium-ion battery, the electrolyte solution containing lithium bis(oxalato)borate and vinylene carbonate;
(B) performing initial charging of the lithium-ion battery including the electrolyte solution; and
(C) aging the lithium-ion battery after the initial charging, wherein during the (A), in the electrolyte solution, a mass fraction of lithium bis(oxalato)borate is more than 0.10% and not more than 0.50%, and a mass fraction of vinylene carbonate is not less than 0.10% and not more than 0.50%,
during the aging, lithium bis(oxalato)borate and vinylene carbonate contained in the electrolyte solution are degraded, and
after the aging, in the electrolyte solution, a mass fraction of lithium bis(oxalato)borate is less than 0.10% and a mass fraction of vinylene carbonate is less than 0.10%,
the aging comprises:
(c1) adjusting a state of charge of the lithium-ion battery to a range of 50% to 80% so that an electric potential of a negative electrode is equal to or less than both a reduction potential of lithium bis(oxalato)borate and a reduction potential of vinylene carbonate; and
(c2) storing the lithium-ion battery in an environment at a temperature of range of 60° C. to 85° C. for a time range of 10 hours to 48 hours.