US 12,230,796 B2
Secondary battery
Takuju Hashimoto, Kyoto (JP); and Yuki Niwata, Kyoto (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed by MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed on Mar. 24, 2022, as Appl. No. 17/703,293.
Application 17/703,293 is a continuation of application No. PCT/JP2020/033536, filed on Sep. 4, 2020.
Claims priority of application No. 2019-178788 (JP), filed on Sep. 30, 2019.
Prior Publication US 2022/0216472 A1, Jul. 7, 2022
Int. Cl. H01M 4/525 (2010.01); C01G 51/42 (2025.01); H01M 10/0525 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 51/42 (2013.01); H01M 10/0525 (2013.01); H01M 10/0569 (2013.01); C01P 2002/50 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0037 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a positive electrode including a positive electrode active material particle,
a negative electrode, and
an electrolytic solution including a chain carboxylic acid ester and a cyclic ether,
wherein the positive electrode active material particle includes a layered rock-salt lithium composite oxide represented by Formula (1) and a spinel metal oxide represented by Formula (2), and wherein the spinel metal oxide is provided on at least a surface of the layered rock-salt lithium composite oxide;
LixCoaNibM(1-a-b)O2  (1)
wherein
M represents at least one of magnesium (Mg), aluminum (Al), titanium (Ti), manganese (Mn), yttrium (Y), zirconium (Zr), molybdenum (Mo), or tungsten (W), and
x, a, and b satisfy 0.9≤x≤1.2, 0≤a≤1, and 0≤b≤1, respectively,
X3O4  (2)
wherein X includes at least one of cobalt (Co), aluminum, magnesium, or zinc (Zn),
a content of the spinel metal oxide in the positive electrode active material particle is from 80 parts per million to 900 parts per million.