US 11,870,072 B2
Secondary battery, battery pack, vehicle, and stationary power supply
Norio Takami, Yokohama Kanagawa (JP); and Tomoko Sugizaki, Kawasaki Kanagawa (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Feb. 26, 2021, as Appl. No. 17/186,062.
Claims priority of application No. 2020-154458 (JP), filed on Sep. 15, 2020.
Prior Publication US 2022/0085369 A1, Mar. 17, 2022
Int. Cl. H01M 4/58 (2010.01); H01M 10/0562 (2010.01); H01M 4/136 (2010.01); H01M 50/46 (2021.01); H01M 4/38 (2006.01); H01M 10/42 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/582 (2013.01) [H01M 4/136 (2013.01); H01M 4/382 (2013.01); H01M 10/0562 (2013.01); H01M 10/425 (2013.01); H01M 50/46 (2021.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a positive electrode including a halide, the halide including at least one metal element selected from the group consisting of copper, iron, nickel, cobalt, tin, and zinc, as a positive electrode active material;
a negative electrode including at least one selected from the group consisting of lithium metal, a lithium alloy, and a compound capable of having Li inserted and extracted, as a negative electrode active material;
a first nonaqueous electrolyte formed of an ionic liquid including chlorine ions comprising a non-chloroaluminate-based ionic liquid and the first nonaqueous electrolyte being in contact with the positive electrode;
a second nonaqueous electrolyte including lithium ions that is different from the ionic liquid including chlorine ions, and is in contact with the negative electrode; and
a separator having lithium ion conductivity and being interposed between the positive electrode and the negative electrode, and
wherein the separator having lithium ion conductivity allows only lithium ions to permeate.