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 |
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;
![]() 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%.
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