US 12,322,795 B2
Lithium ion secondary battery
Ryosuke Kido, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Apr. 19, 2022, as Appl. No. 17/723,785.
Claims priority of application No. 2021-088276 (JP), filed on May 26, 2021.
Prior Publication US 2022/0384796 A1, Dec. 1, 2022
Int. Cl. H01M 4/48 (2010.01); H01M 4/02 (2006.01); H01M 4/13 (2010.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/48 (2013.01) [H01M 4/13 (2013.01); H01M 4/366 (2013.01); H01M 2004/027 (2013.01); H01M 10/0525 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A lithium ion secondary battery comprising:
a positive electrode;
a negative electrode;
a separator located between the positive electrode and the negative electrode; and
an electrolytic solution, wherein
the negative electrode includes a negative electrode active material which contains silicon oxide and a compound containing a first element,
the electrolytic solution contains a non-aqueous solvent and an imide salt which contains the first element and an imide anion, and
the first element is any one or more elements selected from the group consisting of K, Na, Mg, Ca, Cs, Al, and Zn.