Electrolyte, secondary battery, and electronic device

Abstract

An electrolyte, a secondary battery, and an electronic device. The electrolyte comprises ethyl 2,2-difluoroacetate, 1,2,3-tris(2-cyanoethoxy)propane, and 1,3-propane sultone. Based on 100 parts by mass of the electrolyte, ethyl 2,2-difluoroacetate accounts for 1.5 to 6 parts by mass, 1,2,3-tris(2-cyanoethoxy)propane accounts for 0.5 to 4 parts by mass, and 1,3-propane sultone accounts for 1 to 5.5 parts by mass. The overcurrent and overtemperature safety of secondary batteries are improved.

Description

An electrolyte, a secondary battery, and an electronic device

[0001] Technical Field

[0002] This application relates to the field of energy storage, specifically to an electrolyte, a secondary battery, and an electronic device.

Claims

1. An electrolyte, characterized in that, The electrolyte comprises ethyl 2,2-difluoroacetate, 1,2,3-tris(2-cyanoxy)propane, and 1,3-propanesulfonate lactone, wherein, relative to 100 parts by mass of the electrolyte, the ethyl 2,2-difluoroacetate comprises 1.5 to 6 parts by mass, the 1,2,3-tris(2-cyanoxy)propane comprises 0.5 to 4 parts by mass, and the 1,3-propanesulfonate lactone comprises 1 to 5.5 parts by mass.

2. The electrolyte according to claim 1, characterized in that, The mass ratio of the ethyl 2,2-difluoroacetate, the 1,2,3-tris(2-cyanoxy)propane and the 1,3-propanesulfonate lactone is (2~5):(0.6~3):(2~5).

3. The electrolyte according to claim 1, characterized in that, The electrolyte further includes vinylene carbonate and ethyl propionate, and the total content of vinylene carbonate and ethyl propionate is 40 to 55 parts by mass relative to 100 parts by mass of the electrolyte.

4. The electrolyte according to any one of claims 1 to 3, characterized in that, The electrolyte also includes fluoride ions, wherein the amount of fluoride ions is 0.5 to 2 parts by mass relative to 100 parts by mass of the electrolyte.

5. The electrolyte according to claim 4, characterized in that, The sum of the contents of ethyl 2,2-difluoroacetate, 1,2,3-tris(2-cyanoxy)propane, 1,3-propanesulfonate lactone and fluoride ions, relative to 100 parts by weight of the electrolyte, is 7.7 to 11.5 parts by weight.

6. The electrolyte according to any one of claims 1 to 3, characterized in that, The electrolyte further includes ethylene carbonate, lithium difluorophosphate, and fluoroethylene carbonate, wherein the total content of ethylene carbonate, lithium difluorophosphate, and fluoroethylene carbonate is 12 to 21 parts by mass relative to 100 parts by mass of the electrolyte.

7. The electrolyte according to claim 6, characterized in that, The electrolyte further includes propylene carbonate and adiponitrile, and the sum of the contents of propylene carbonate and adiponitrile is 20 to 40 parts by mass relative to 100 parts by mass of the electrolyte.

8. The electrolyte according to claim 7, characterized in that, Relative to 100 parts by mass of the electrolyte, the sum of the contents of ethylene carbonate, lithium difluorophosphate and fluoroethylene carbonate is A parts by mass, the sum of the contents of propylene carbonate and adiponitrile is B parts by mass, and the ratio of B to A ranges from 1.35 to 1.

79.

9. A secondary battery, characterized in that, It includes the electrolyte according to any one of claims 1 to 8.

10. An electronic device, characterized in that, It includes the secondary battery according to claim 9.

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