US 12,015,123 B2
Lithium ion secondary battery
Satoru Hirakawa, Sagamihara (JP); and Hideaki Sasaki, Sagamihara (JP)
Assigned to AESC Japan Ltd., Zama (JP)
Filed by AESC Japan Ltd., Zama (JP)
Filed on Oct. 18, 2022, as Appl. No. 17/968,121.
Application 17/968,121 is a continuation of application No. 16/493,904, abandoned, previously published as PCT/JP2018/004667, filed on Feb. 9, 2018.
Claims priority of application No. 2017-049754 (JP), filed on Mar. 15, 2017.
Prior Publication US 2023/0062771 A1, Mar. 2, 2023
Int. Cl. H01M 10/0567 (2010.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01); H01M 10/0568 (2010.01)
CPC H01M 10/0567 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/0565 (2013.01); H01M 10/0568 (2013.01); H01M 2004/028 (2013.01); H01M 2300/004 (2013.01)] 12 Claims
 
1. A method of making a lithium ion secondary battery, the method comprising:
obtaining a positive electrode which is capable of storing and releasing lithium;
obtaining a negative electrode which is capable of storing and releasing lithium;
obtaining a nonaqueous electrolyte which contains lithium salts, cyclic disulfonic acid ester, and a crosslinked polymer that contains a crosslinked product of meth(acrylate)-based polymer having a cyclic ether structure as a crosslinkable group in a side chain,
at least a part of the lithium salts are imide lithium salts, and
the nonaqueous electrolyte is a liquid having a fluidity;
combining the positive electrode, the negative electrode, and the nonaqueous electrolyte to obtain a lithium ion secondary battery which has not been subjected an initial charge and thus a solid electrolyte interphase (SEI) is not present on a surface of the negative electrode, and
further comprising performing an initial charging of the lithium ion secondary battery,
wherein the initial charging the cyclic disulfonic acid ester forms a coated solid electrolyte interphase (SEI) film on a surface of a negative electrode.