Ester-based ionic liquid electrolyte solution for low temperature lithium ion battery

A technology of lithium-ion batteries and ionic liquids, applied in the field of electrolytes and ester-based ionic liquid electrolytes, can solve problems such as potential safety hazards

Inactive Publication Date: 2013-06-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of easy solidification and crystallization of organic solvents in the prior art un

Method used

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  • Ester-based ionic liquid electrolyte solution for low temperature lithium ion battery
  • Ester-based ionic liquid electrolyte solution for low temperature lithium ion battery
  • Ester-based ionic liquid electrolyte solution for low temperature lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) in a mass ratio of 1:1:3 under normal temperature and pressure water, oxygen content less than 1ppm, and an inert atmosphere. uniform. Based on the weight, 1-25% of methyl acetate-modified imidazole bis(trifluoromethyl)sulfonimide ionic liquid is added. Dissolve LiPF in this mixed solvent 6 , added in batches, and fully stirred after adding, so that it was prepared as a 1M electrolyte.

Embodiment 2

[0018] As in Example 1, ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) were uniformly mixed in a mass ratio of 1:1:6. Based on the weight, 1-25% of methyl acetate-modified imidazole bis(trifluoromethyl)sulfonimide ionic liquid is added.

Embodiment 3

[0020] As in Example 1, ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) were uniformly mixed in a mass ratio of 1:1:3. Based on the weight, 1-25% of methyl acetate-modified imidazole bis(trifluoromethyl)sulfonimide ionic liquid is added. Dissolve LiPF in this mixed solvent 6 , added in batches, and stirred thoroughly after adding, so that it was prepared as a 1M electrolyte. Add 1 to 5% fluoroethylene carbonate to the above electrolytic solution. Test low temperature performance.

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Abstract

The invention relates to an ester-based ionic liquid electrolyte solution for a low temperature lithium ion battery. The electrolyte solution contains a lithium salt, non-aqueous solvents, an additive and an ionic liquid. With a wide liquid range, the ionic liquid can still maintain good liquid properties at a low temperature. The adding of the ionic liquid can effectively improve the low temperature performance of the lithium ion battery, thus widening the operating temperature range of the electrolyte solution. At a temperature of -40DEGC, the discharge capacity of the battery composed of the electrolyte solution accounts for 60% of the discharge capacity at 25DEG C. The invention aims to overcome the defects of low temperature problem and potential safety hazards in the electrolyte solution composed of an organic solvent and a lithium salt in the prior art, and provides the ester-based ionic liquid electrolyte solution for a low temperature lithium ion battery.

Description

technical field [0001] The invention relates to an electrolyte solution for lithium ion batteries, in particular to an ester-based ionic liquid electrolyte solution for low-temperature lithium ion batteries, and belongs to the field of lithium ion batteries. Background technique [0002] In the application fields of electric vehicles, aerospace technology, and military low-temperature power supplies, because nickel-cadmium and nickel-hydrogen batteries use water-based electrolytes, there is a problem of low-temperature freezing, and it is very difficult to work in an environment of -20°C, and it is even more difficult to apply In the ultra-low temperature environment below -40°C. Therefore, higher requirements are put forward for the use of lithium-ion batteries under unconventional conditions, and the normal use of low-temperature or ultra-low-temperature lithium-ion batteries has become a research hotspot today. The development of lithium-ion batteries with excellent low-...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0568H01M10/0525
CPCY02E60/10
Inventor 张锁江董陶蔡迎军张亮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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