US 12,300,814 B2
Lithium ion secondary battery
Zhiqiang Li, Ningde (CN); and Changlong Han, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Oct. 24, 2023, as Appl. No. 18/383,050.
Application 18/383,050 is a continuation of application No. 16/768,753, abandoned, previously published as PCT/CN2019/105138, filed on Sep. 10, 2019.
Claims priority of application No. 201811094862.X (CN), filed on Sep. 19, 2018.
Prior Publication US 2024/0063379 A1, Feb. 22, 2024
Int. Cl. H01M 4/505 (2010.01); C01G 53/50 (2025.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [C01G 53/50 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0037 (2013.01)] 19 Claims
 
1. A lithium ion secondary battery comprising a battery core and an electrolyte, wherein:
the battery core comprises a negative electrode active material and a lithium-manganese-based positive electrode active material;
wherein the lithium-manganese-based positive electrode active material comprises first lithium-manganese-based positive electrode active material represented by chemical formula (1) and second lithium-manganese-based positive electrode active material represented by chemical formula (2),
Li1+xMnaNibM1−a−bO2−yAy  Chemical formula (1)
in the chemical formula (1), −0.1≤x≤0.2, 0<a<1, 0≤b<1, 0<a+b<1, 0≤y<0.2, and M is one or more of Co, Fe, Cr, Ti, Zn, V, Al, Zr and Ce; A comprises one or more of S, N, F, Cl, Br and I;
Li1+zMncN2−cO4−dBd  Chemical formula (2)
in the chemical formula (2), −0.1≤z≤0.2, 0<c≤2, 0≤d<1, and N comprises one or more of Ni, Fe, Cr, Ti, Zn, V, Al, Mg, Zr and Ce, and B comprises one or more of S, N, F, Cl, Br and I;
the electrolyte comprises a solvent, a lithium salt and an additive, and the additive comprises vinylene carbonate; and
wherein weight percentage q of the electrolyte based on a total weight of the positive electrode active material layer in the battery core is from 50 wt % to 70 wt %, weight percentage r of vinylene carbonate present in the electrolyte is from 0.01 wt % to 3.5 wt %, compaction density s of negative electrode active material layer in the battery core is from 1.3 g/cm3 to 1.65 g/cm3, and weight percentage p of manganese element present in the positive electrode active material is from 5 wt % to 50 wt %, and q, r, s, p satisfy formula (1):

OG Complex Work Unit Math
in the formula (1), the units of q, r, and p are wt %, and the unit of s is g/cm3.