US 12,341,180 B2
Secondary battery with positive electrode additional layer including inert material
Satoshi Shibutani, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/637,537
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jun. 23, 2020, PCT No. PCT/JP2020/024532
§ 371(c)(1), (2) Date Feb. 23, 2022,
PCT Pub. No. WO2021/039063, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-154693 (JP), filed on Aug. 27, 2019.
Prior Publication US 2022/0293896 A1, Sep. 15, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/0404 (2013.01) [H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A secondary battery, comprising:
a positive electrode;
a negative electrode;
a separator disposed between the positive electrode and the negative electrode; and
an electrolyte, wherein
the positive electrode has a positive electrode current collector, a positive electrode mixture layer including a positive electrode active material, and an additional layer including an inert material;
the inert material is a Li-containing transition metal oxide having a crystal structure belonging to any of space groups Fm3m, C2/M, Immm, and P3m1;
a content of the inert material in the additional layer is 60 mass % or more;
a basis weight of the additional layer is 3.8 g/m2 or more and 50 g/m2 or less;
the additional layer is located between the positive electrode current collector and the positive electrode mixture layer;
of the inert material, the Li-containing transition metal oxide having a crystal structure belonging to the space group Immm is a Li-containing transition metal oxide having a crystal structure with Cu as a main component of a transition metal; and
the inert material includes at least one of the group consisting of: a Li-containing transition metal oxide represented by LixFeyM1−yO2, where 0.5≤x≤1.5, 0.5≤y≤1, and M represents a transition metal other than Fe, and belonging to a space group Fm3m; a Li-containing transition metal oxide represented by LixMnyM1−yO2, where 0.5≤x≤1.5, 0.5≤y≤1, and M represents a transition metal other than Mn, and belonging to a space group Fm3m; a Li-containing transition metal oxide represented by LixCuyM1−yO2, where 0.5≤x≤1.5, 0.5≤y≤1, and M represents a transition metal other than Cu, and having a crystal structure belonging to any of space groups C2/M, Immm, and P3m1; and a Li-containing transition metal oxide represented by LixNiyM1−yO2, where 0.5≤x≤1.5, 0.5≤y≤1, and M represents a transition metal other than Ni, and having a crystal structure belonging to any of space groups C2/M, and P3m1.