US 12,230,795 B2
Positive-electrode active material and battery
Mitsuhiro Hibino, Kyoto (JP); and Youshin Lee, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Sep. 15, 2021, as Appl. No. 17/475,461.
Application 17/475,461 is a continuation of application No. PCT/JP2020/026108, filed on Jul. 3, 2020.
Claims priority of application No. 2019-145559 (JP), filed on Aug. 7, 2019.
Prior Publication US 2021/0408541 A1, Dec. 30, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/36 (2006.01); H01M 10/36 (2010.01); H01M 4/46 (2006.01); H01M 10/054 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 4/366 (2013.01); H01M 10/36 (2013.01); H01M 2004/028 (2013.01); H01M 4/466 (2013.01); H01M 10/054 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A magnesium secondary battery comprising:
a positive electrode that contains a composite oxide as a positive-electrode active material;
a negative electrode; and
an electrolyte that conducts magnesium ions,
wherein the composite oxide is, in an initial state, represented by the following formula NaxMyO2,
where M is nickel and manganese, and
0<x+y≤2,
wherein the composite oxide, in a state after charge and discharge, contains magnesium ions, with which sodium ions of the composite oxide in the initial state are replaced, and
wherein the magnesium ions replacing the sodium ions of the composite oxide in the initial state are provided by the electrolyte.