Electrolyte for lithium-ion battery, lithium-ion battery, battery module, battery pack, and apparatus

Patent metadata

Field	Value
Publication number	US-12315880-B2
Application number	US-202217702645-A
Country	US
Kind code	B2
Filing date	Mar 23, 2022
Priority date	Oct 18, 2019
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

This application provides an electrolyte for lithium-ion battery, a lithium-ion battery, a battery module, a battery pack, and an apparatus. The electrolyte includes an organic solvent, an electrolytic lithium salt dissolved in the organic solvent, and additives, where the additives include a first additive and a second additive. The first additive includes an alkenyl dioxaborolane compound represented by formula I or formula II, and the second additive includes phosphoric acid cyclic anhydride represented by formula III. After the electrolyte of this application is applied to a lithium-ion battery, the lithium-ion battery can, at high voltage, have a good high-temperature cycling performance and high-temperature storage performance, a low direct current resistance, as well as good high-voltage characteristics.

First claim

What is claimed is:

1. An electrolyte for lithium-ion battery, comprising:
an organic solvent;
an electrolytic lithium salt dissolved in the organic solvent; and
additives;
wherein the additives comprise a first additive and a second additive;
wherein the first additive comprises an alkenyl dioxaborolane compound represented by formula I or formula II:

wherein R 3 , R 4 , R 5 , R 6 , R 9 , and R 10 are each independently selected from H and a saturated alkyl group containing 1 to 10 carbon atoms, R 1 and R 2 jointly form a structure, R 7 and R 8 jointly form a structure, wherein the structure is selected from the group consisting of:

 and
the second additive comprises phosphoric acid cyclic anhydride represented by formula III,

wherein R 11 , R 12 , and R 13 are each independently selected from H, a saturated or unsaturated alkyl group containing 1 to 20 carbon atoms, or a group containing 6 to 18 carbon atoms and at least one benzene ring.

2. The electrolyte according to claim 1 , wherein the structure is selected from the group consisting of:

3. The electrolyte according to claim 1 , wherein the first additive is selected from one or more of the following compounds:
compound 1-5:2-(3,6-dihydro-2H-thiopyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and
compound 1-6:2-(1-styryl)-4,4,5,5-tetramethyl-(1,3,2)dioxaborolane.

4. The electrolyte according to claim 1 , wherein in formula III, R 11 , R 12 , and R 13 are each independently selected from H or a saturated or unsaturated alkyl group containing 1 to 5 carbon atoms.

5. The electrolyte according to claim 1 , wherein the second additive is selected from one or more of the following compounds:
compound 2-1: trimethyl phosphoric acid cyclic anhydride,
compound 2-2: triethyl phosphoric acid cyclic anhydride,
compound 2-3: tripropyl phosphoric acid cyclic anhydride, and
compound 2-4: triphenyl phosphoric acid cyclic anhydride.

6. The electrolyte according to claim 1 , wherein a concentration of the first additive in the electrolyte is 0.1 wt % to 3 wt %.

7. The electrolyte according to claim 1 , wherein a concentration of the second additive in the electrolyte is 0.05 wt % to 2 wt %.

8. The electrolyte according to claim 1 , wherein the electrolytic lithium salt is selected from one or more of LiPF 6 , LiPO 2 F 2 , Li 2 PO 3 F, LiBF 4 , LiSO 3 F, LiTFMSB, LiN(SO 2 F) 2 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 C 2 F 5 ) 2 , LiBOB, LiPFO, and lithium tetrafluoro [oxalate-O,O′] phosphate.

9. The electrolyte according to claim 1 , wherein the electrolytic lithium salt is selected from one or more of LiPF 6 , LiBF 4 , LiSO 3 F, LiTFMSB, LiPO 2 F 2 , LIN (SO 2 CF 3 ) 2 , LiN(SO 2 F) 2 , LiBOB, and LiPFO.

10. The electrolyte according to claim 1 , wherein a concentration of the electrolytic lithium salt in the electrolyte is 0.5 M to 2 M.

11. A lithium-ion battery, comprising a positive electrode, a negative electrode, a separator, and the electrolyte according to claim 1 .

12. An apparatus, comprising the lithium-ion battery according to claim 11 , wherein the lithium-ion battery is used as a power source for the apparatus, and the apparatus comprises an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, an electric vessel, and an energy storage system.

13. A battery module, comprising the lithium-ion battery according to claim 11 .

14. A battery pack, comprising the battery module according to claim 13 .

15. The electrolyte according to claim 1 , wherein the first additive comprises:
compound 1-5:2-(3,6-dihydro-2H-thiopyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.

16. The electrolyte according to claim 1 , wherein the first additive comprises:
compound 1-6:2-(1-styryl)-4,4,5,5-tetramethyl-(1,3,2)dioxaborolane.

17. The electrolyte according to claim 1 , wherein the second additive comprises:
compound 2-4: triphenyl phosphoric acid cyclic anhydride.

18. An electrolyte for lithium-ion battery, comprising:
an organic solvent;
an electrolytic lithium salt dissolved in the organic solvent; and
additives;
wherein the additives comprise a first additive and a second additive;
wherein the first additive comprises an alkenyl dioxaborolane compound selected from the group consisting of:
compound 1-1:2-isopropenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane,
compound 1-2:5,5-dimethyl-2-(isopropen-1-yl)-1,3,2-dioxaborolane,
compound 1-4: trans-2-butene-2-boronic acid pinacol ester,
compound 1-5:2-(3,6-dihydro-2H-thiopyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane,
compound 1-6:2-(1-styryl)-4,4,5,5-tetramethyl-(1,3,2)-dioxaborolane, and
any combinations thereof, and
the second additive comprises phosphoric acid cyclic anhydride selected from the group consisting of:
compound 2-1: trimethyl phosphoric acid cyclic anhydride,
compound 2-2: triethyl phosphoric acid cyclic anhydride,
compound 2-3: tripropyl phosphoric acid cyclic anhydride,
compound 2-4: triphenyl phosphoric acid cyclic anhydride, and
any combinations thereof.

19. The electrolyte according to claim 18 , wherein the first additive comprises one selected from the group consisting of:
compound 1-5:2-(3,6-dihydro-2H-thiopyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane,
compound 1-6:2-(1-styryl)-4,4,5,5-tetramethyl-(1,3,2)-dioxaborolane, and
any combinations thereof.

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Li Yongkun
• Wu Kai
• Cheng Bo
• Ju Feng

Classifications

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0525 Primary

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

• H01M2220/20

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title