US 12,068,457 B2
Nonaqueous electrolyte compositions for lithium-ion battery
Junmin Feng, Ningde (CN); Peipei Chen, Ningde (CN); Chenghua Fu, Ningde (CN); and Chengdu Liang, Ningde (CN)
Assigned to Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Mar. 11, 2021, as Appl. No. 17/199,256.
Application 17/199,256 is a continuation of application No. PCT/CN2019/108602, filed on Sep. 27, 2019.
Claims priority of application No. 201811140341.3 (CN), filed on Sep. 28, 2018.
Prior Publication US 2021/0203000 A1, Jul. 1, 2021
Int. Cl. H01M 10/0569 (2010.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01); H01M 4/1391 (2010.01); H01M 10/0568 (2010.01)
CPC H01M 10/0569 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0567 (2013.01); H01M 4/1391 (2013.01); H01M 10/0568 (2013.01); H01M 2220/20 (2013.01); H01M 2300/0022 (2013.01); H01M 2300/0034 (2013.01); H01M 2300/0037 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A lithium-ion battery, comprising a positive electrode plate, a negative electrode plate, a separator, and a nonaqueous electrolyte, wherein the positive electrode plate comprises Li1+xNiaCobMe(1−a−b)O2−cYc, wherein −0.1≤x≤0.2, 0.8≤a<1, 0<b<1, 0<(1−a−b)<1, 0≤c<1, Me is selected from one or more of Mn, Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti, and Zr, and Y is selected from one or more of F, Cl, and Br;
the nonaqueous electrolyte comprises a nonaqueous solvent and a lithium salt, wherein the nonaqueous solvent comprises a carbonate solvent and a high oxidation potential solvent, and the high oxidation potential solvent comprises two compounds respectively represented by formula I and formula II;

OG Complex Work Unit Chemistry
in formula I, R1 and R2 are independently selected from unsubstituted, partially halogenated, or fully halogenated alkyl groups having 1 to 5 carbon atoms, and at least one of R1 and R2 is a partially halogenated or fully halogenated alkyl group having 1 to 5 carbon atoms; and
in formula II, R3 is selected from partially halogenated or fully halogenated alkylidene groups having 1 to 6 carbon atoms, wherein
a halogen atom is selected from one or more of F, Cl, Br, and I; and
wherein the high oxidation potential solvent includes both the compound represented by formula I and the compound represented by formula II;
wherein based on a total weight of the nonaqueous solvent, a weight percentage of the two compounds respectively represented by formula I and formula II is greater than 10%.