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High-temperature lithium battery electrolyte

An electrolyte and lithium battery technology, which is applied in the field of high-temperature lithium battery electrolyte, can solve the problems of poor high-temperature performance of lithium-ion batteries, and achieve the effects of improving composition and thickness, improving high-temperature performance, and improving high-temperature conductivity

Inactive Publication Date: 2017-10-03
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting point of EC, which is solid at room temperature, the high-temperature performance of lithium-ion batteries using EC-based electrolytes is poor.

Method used

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  • High-temperature lithium battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add diethyl carbonate (DEC), ethylene carbonate (EC), and propylene carbonate (PC) in sequence according to the mass ratio of 65:32:5. When the temperature drops to 15°C, ensure that the temperature is not higher than 10°C Slowly add lithium salt to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1.3mol / L, a lithium difluorosulfonimide concentration of 0.1mol / L, and a lithium difluorooxalate borate of 0.1mol / L, and continue stirring until the solution is clear, and then follow the Calculate the total mass of the electrolyte, add 3% fluoroethylene carbonate, stir well, transfer to a bottle filled with inert gas and store it for later use.

Embodiment 2

[0024] Add diethyl carbonate (DEC), ethylene carbonate (EC), and propylene carbonate (PC) in sequence according to the mass ratio of 65:32:5. When the temperature drops to 15°C, ensure that the temperature is not higher than 10°C Slowly add lithium salt to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1.3mol / L, a lithium difluorosulfonimide concentration of 0.1mol / L, and a lithium difluorooxalate borate of 0.1mol / L, and continue stirring until the solution is clear, and then follow the Calculate the total mass of the electrolyte, add 2% sulfites, stir well, and transfer to a bottle filled with inert gas for storage.

Embodiment 3

[0026] Add diethyl carbonate (DEC), ethylene carbonate (EC), and propylene carbonate (PC) in sequence according to the mass ratio of 65:32:5. When the temperature drops to 15°C, ensure that the temperature is not higher than 10°C Slowly add lithium salt to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1.3mol / L, a lithium difluorosulfonimide concentration of 0.1mol / L, and a lithium difluorooxalate borate of 0.1mol / L, and continue stirring until the solution is clear, and then follow the The total mass of the electrolyte is calculated by adding 2% vinylene carbonate, fully stirred, and transferred to a bottle filled with inert gas for storage.

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Abstract

The invention belongs to the technical field of lithium battery materials, and particularly relates to a high-temperature lithium battery electrolyte. The electrolyte is prepared from lithium salt, a compound solvent and a functional additive. The functional additive accounts for 1%-10% of the electrolyte. Compared with the traditional lithium battery electrolyte, the high-temperature lithium battery electrolyte is improved in ion conductivity, and enables batteries to be used at higher temperatures. Both a voltage platform and a discharge capacity are improved when the lithium ion battery containing the electrolyte discharges at high temperature, so that the high-temperature performance and cycle performance of the lithium battery are improved.

Description

(1) Technical field [0001] The invention belongs to the technical field of lithium battery materials, in particular to a high-temperature lithium battery electrolyte. (2) Background technology [0002] Lithium-ion batteries have become the first choice for portable power sources and power batteries because of their high voltage, large specific energy, long charge and discharge life, safety and environmental protection. In some aviation, aerospace and military fields, the harsh requirements for lithium-ion batteries are mainly reflected in high-temperature performance, cycle performance and safety, and the composition of the electrolyte is one of the key factors determining these performances. The electrolyte generally uses non-aqueous organic esters capable of dissolving lithium salts. Ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), propylene carbonate (PC), ethyl methyl carbonate (EMC), ethyl acetate (EA) are currently widely used in Organic so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0567
CPCH01M10/0567H01M10/0568H01M2300/0025Y02E60/10
Inventor 赵志华王吉峰李立飞任海任加兴
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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