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Low-temperature electrolyte for ternary power lithium ion battery and preparation method

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low discharge efficiency at low temperature, and achieve high discharge efficiency at low temperature, good discharge performance at low temperature, and reasonable composition ratio

Inactive Publication Date: 2013-07-24
山东威高新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly adopts small molecular linear ester with low melting point, which effectively solves the problem of low low-temperature discharge efficiency of lithium-ion batteries at present

Method used

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  • Low-temperature electrolyte for ternary power lithium ion battery and preparation method
  • Low-temperature electrolyte for ternary power lithium ion battery and preparation method
  • Low-temperature electrolyte for ternary power lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: In a glove box filled with nitrogen (moisture is less than 0.9ppm), the dehydrated organic solvents ethylene carbonate EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC and methyl acetate MA are fully mixed, The volume ratio of organic solvent ethylene carbonate EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC, and methyl acetate MA is 4:9:6:6 (water content is less than 10ppm), then slowly add LiPF 6 , and magnetically stirred until the lithium salt was fully dissolved, and finally added vinylene carbonate VC and 1,3-propane sultone PS, continued to stir until all components were mixed uniformly, and left for 0.5h to obtain Example 1 low-temperature lithium The ion battery electrolyte, the concentration of the above-mentioned lithium salt in the electrolyte is 1.5 mol / L, the organic solvent accounts for 95%, and the additive accounts for 5%.

Embodiment 2

[0025] In a glove box filled with nitrogen (moisture is less than 0.9ppm), the dehydrated organic solvents ethylene carbonate EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC and methyl acetate MA were thoroughly mixed, and the organic solvent ethylene carbonate The volume ratio of ester EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC, and methyl acetate MA is 4:9:6:8 (water content is less than 10ppm), and then slowly add LiPF 6 , and stir with a magnetic stirrer until the lithium salt is fully dissolved, and finally add vinylene carbonate VC and 1,3-propane sultone PS, and continue to stir until all components are mixed uniformly, and set aside for 0.5h to obtain Example 2 Low-temperature lithium-ion battery electrolyte, the concentration of the above-mentioned lithium salt in the electrolyte is 0.8 mol / L, organic solvents account for 90%, and additives account for 10%.

Embodiment 3

[0027] In a glove box filled with nitrogen (moisture is less than 0.9ppm), the dehydrated organic solvents ethylene carbonate EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC and methyl acetate MA were thoroughly mixed, and the organic solvent ethylene carbonate The volume ratio of ester EC, dimethyl carbonate DMC, ethyl methyl carbonate EMC, and methyl acetate MA is 4:9:6:8 (water content is less than 10ppm), and then slowly add LiPF 6 , and magnetically stir until the lithium salt is fully dissolved, and finally add a little each of vinylene carbonate VC, 1,3-propane sultone PS and fluoroethylene carbonate, continue to stir until all components are evenly mixed, and set aside for 0.5h. That is, the low-temperature lithium-ion battery electrolyte of Example 3 was obtained, the concentration of the above-mentioned lithium salt in the electrolyte was 0.6 mol / L, the organic solvent accounted for 85%, and the additive accounted for 15%.

[0028] According to the production ...

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Abstract

The invention relates to the technical field of electrolyte for power lithium ion batteries, and in particular relates to low-temperature electrolyte for a ternary power lithium ion battery. The low-temperature electrolyte is characterized by consisting of lithium salt, an organic solvent and an additive, wherein the organic solvent accounts for 85% to 97% in mass percent while the additive accounts for 3% to 15% in mass percent; and the lithium salt is added to ensure that the concentration of the lithium salt of the electrolyte is 0.6 to 1.5 mol / L. The preparation method comprises the following steps of: adding the organic solvent with water content lower than 10ppm into a fluorinated bottle according to a proportion under the protection of dry inert gas for performing molecular sieve dehydration treatment, uniformly stirring the organic solvent until the water content of the organic solvent is 0 to 10ppm, adding the additive and the lithium salt according to set proportions into the uniformly stirred organic solvent, and uniformly stirring the three materials to obtain the required low-temperature electrolyte, wherein the temperature in an operation process is controlled to range from 8 to 12 DEG C. The electrolyte is low in melting point and viscosity and wide in temperature window range, has high electric conductivity at room temperature to -40 DEG C, and can be applied to the use of the ternary power lithium ion battery under a low-temperature condition.

Description

technical field [0001] The invention relates to the technical field of electrolytes for power batteries, and in particular discloses a low-temperature electrolyte for ternary power batteries and a preparation method thereof. Background technique [0002] As we all know, lithium-ion batteries have the advantages of high voltage, large specific energy, long charge and discharge life, stable discharge performance, safe use, and environmental friendliness, and are more and more widely used by people. The iron-lithium battery is more than 30% higher, and its low-temperature performance and consistency are even better, and there is great room for improvement in the future. [0003] With the rapid development of lithium-ion battery applications, military and aerospace fields require lithium-ion batteries to be used at low temperatures below -40°C. It has been reported in the literature that at -40°C, the battery discharge capacity is extremely low or even undischargeable. Judgin...

Claims

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Application Information

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IPC IPC(8): H01M10/0569
CPCY02E60/10
Inventor 王庆生杨哲龙包彦彦吴磊
Owner 山东威高新能源科技有限公司
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