Granted Patent B2

US 12,315,880 · App. 17/702,645 · Granted May 27, 2025

Inventors: Yongkun Li (Ningde, CN); Kai Wu (Ningde, CN); Bo Cheng (Ningde, CN); Feng Ju (Ningde, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

H01M10/0567H01M10/0525H01M2300/0025

Abstract

Claims (57)

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.

Assignments (2)

Priority Claims (1)

Continuity (2)

References Cited (15)