Nonaqueous electrolytic solution, lithium-ion battery, battery module, battery pack, and apparatus

Patent metadata

Field	Value
Publication number	US-12482863-B2
Application number	US-202017130713-A
Country	US
Kind code	B2
Filing date	Dec 22, 2020
Priority date	Sep 28, 2018
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

This application provides a nonaqueous electrolytic solution, a lithium-ion battery, a battery module, a battery pack, and an apparatus. The nonaqueous electrolytic solution includes a nonaqueous solvent and a lithium salt. The nonaqueous solvent includes a carbonate solvent and a high-oxidation-potential solvent. The carbonate solvent is a chain carbonate, and the high-oxidation-potential solvent is selected from one or more of compounds denoted by Formula I and Formula II. This application improves electrochemical performance of the lithium-ion battery under a high temperature and a high voltage as well as safety performance such as overcharge safety and hot-oven safety of the lithium-ion battery, and also ensures kinetic performance of the lithium-ion battery to some extent.

First claim

What is claimed is:

1 . A lithium-ion battery, comprising a positive electrode plate, a negative electrode plate, a separator, and a nonaqueous electrolytic solution, wherein the nonaqueous electrolytic solution comprises a nonaqueous solvent and a lithium salt; and
the nonaqueous solvent comprises a carbonate solvent and a high-oxidation-potential solvent and is free from a non-halogenated cyclic alkylene carbonate, and the high-oxidation-potential solvent comprises at least one compound denoted by Formula I and at least one compound denoted by Formula II:

in Formula I, R 1 and R 2 are separately selected from unsubstituted, partially halogenated, or fully halogenated alkyls that comprise 1 to 5 carbon atoms, and at least one of R 1 or R 2 is a partially halogenated or fully halogenated alkyl that comprises 1 to 5 carbon atoms;
in Formula II, R 3 is selected from partially halogenated or fully halogenated alkylidenes that comprise 1 to 6 carbon atoms; and
a halogen atom thereof is selected from one or more of F, Cl, Br, or I,
the compound denoted by Formula I is selected from the group consisting of:

and any combinations thereof, the compound denoted by Formula II is selected from the group consisting of:

and any combinations thereof,
wherein, based on a total weight of the nonaqueous solvent, the high-oxidation-potential solvent is 40%-60%, the linear chain carbonate is 40%-60%,
based on a total weight of the high-oxidation-potential solvent, the at least one compound denoted by Formula I is 60%-70%, and the at least one compound denoted by Formula II is 30%-40%,
wherein the nonaqueous electrolytic solution further comprises a film-forming additive; and,
wherein the film-forming additive comprises a fluoroethylene carbonate.

2 . The lithium-ion battery according to claim 1 , wherein
the positive electrode plate comprises one or more of Li 1+x Ni a Co b M′ (1-a-b) O 2-c Y c or Li 1+y Ni m Mn n M″ 2-m-n O 4-p Z p , wherein −0.1≤x≤0.2, 0.6≤a≤1, 0≤b<1, 0≤(1-a-b)<1, 0≤c<1, M′ is selected from one or more of Mn, Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti, or Zr, and Y is selected from one or more of F, Cl, or Br; and −0.1≤y≤0.2, 0.4≤m≤1.2, 0.8≤n≤1.6, 0≤(2-m-n)≤0.3, 0≤p≤1, M″ is selected from one or more of Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti, or Zr, and Z is selected from one or more of F, Cl, or Br.

3 . The lithium-ion battery according to claim 1 , wherein
the chain carbonate is selected from one or more of an ethyl methyl carbonate, a methyl propyl carbonate, a methyl isopropyl carbonate, a methyl butyl carbonate, an ethyl propyl carbonate, a dimethyl carbonate, a diethyl carbonate, a dipropyl carbonate, or a dibutyl carbonate.

4 . The lithium-ion battery according to claim 1 , wherein
the film-forming additive further comprises at least one compound selected from the group consisting of a sulfate compound, a sulfite compound, a sultone compound, a disulfonate compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, a cyclic anhydride compound, a phosphite compound, a phosphate compound, a borate compound, a carboxylic acid ester compound, and any combinations thereof.

5 . The lithium-ion battery according to claim 4 , wherein
the film-forming additive further comprises at least an ethylene sulfate.

6 . A battery module, comprising a lithium-ion battery, wherein the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator, and a nonaqueous electrolytic solution, the nonaqueous electrolytic solution comprises a nonaqueous solvent and a lithium salt; and
the nonaqueous solvent comprises a linear chain carbonate solvent and a high-oxidation-potential solvent and is free from a non-halogenated cyclic alkylene carbonate, and the high-oxidation-potential solvent comprises at least one compound selected from a compound denoted by Formula I and at least one compound denoted by Formula II:

in Formula I, R 1 and R 2 are separately selected from unsubstituted, partially halogenated, or fully halogenated alkyls that comprise 1 to 5 carbon atoms, and at least one of R 1 or R 2 is a partially halogenated or fully halogenated alkyl that comprises 1 to 5 carbon atoms;
in Formula II, R 3 is selected from partially halogenated or fully halogenated alkylidenes that comprise 1 to 6 carbon atoms; and
a halogen atom thereof is selected from one or more of F, Cl, Br, or I, the compound denoted by Formula I is selected from the group consisting of:

and any combinations thereof,
the compound denoted by Formula II is selected from the group consisting of:

and any combinations thereof,
wherein, based on a total weight of the nonaqueous solvent, the high-oxidation-potential solvent is 40%-60%, the linear chain carbonate is 40%-60%,
based on a total weight of the high-oxidation-potential solvent, the at least one compound denoted by Formula I is 60%-70%, and the at least one compound denoted by Formula II is 30%-40%,
wherein the nonaqueous electrolytic solution further comprises a film-forming additive; and,
wherein the film-forming additive comprises a fluoroethylene carbonate.

7 . The battery module according to claim 6 , wherein
the positive electrode plate comprises one or more of Li 1+x Ni a Co b M′ (1-a-b) O 2-c Y c or Li 1+y Ni m Mn n M″ 2-m-n O 4-p Z p , wherein −0.1≤x≤0.2, 0.6≤a≤1, 0≤b<1, 0≤(1-a-b)<1, 0≤c<1, M′ is selected from one or more of Mn, Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti, or Zr, and Y is selected from one or more of F, Cl, or Br; and −0.1≤y≤0.2, 0.4≤m≤1.2, 0.8≤n≤1.6, 0≤(2-m-n)≤0.3, 0≤p≤1, M″ is selected from one or more of Al, Mg, Zn, Ga, Ba, Fe, Cr, Sn, V, Sc, Ti, or Zr, and Z is selected from one or more of F, Cl, or Br.

8 . An apparatus, comprising a lithium-ion battery, wherein the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator, and a nonaqueous electrolytic solution, the nonaqueous electrolytic solution comprises a nonaqueous solvent and a lithium salt; and p 1 the nonaqueous solvent consists essentially of a linear chain carbonate solvent and a high-oxidation-potential solvent and is free from a non-halogenated cyclic alkylene carbonate, the carbonate solvent is a linear chain carbonate, and the high-oxidation-potential solvent comprises at least one compound denoted by Formula I and at least one compound denoted by Formula II:

in Formula I, R 1 and R 2 are separately selected from unsubstituted, partially halogenated, or fully halogenated alkyls that comprise 1 to 5 carbon atoms, and at least one of R 1 or R 2 is a partially halogenated or fully halogenated alkyl that comprises 1 to 5 carbon atoms;
in Formula II, R 3 is selected from partially halogenated or fully halogenated alkylidenes that comprise 1 to 6 carbon atoms; and
a halogen atom thereof is

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Fu Chenghua
• Chen Peipei
• Feng Junmin
• Liang Chengdu

Classifications

• H01M2300/0037

  Mixture of solvents · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title