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Secondary battery electrolyte, preparation method thereof, and battery

A secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of not meeting the needs of practical applications, high cost of LiFSI, limited improvement effect, etc., to achieve improved Fast charging cycle performance, reduced polarization, and reduced migration resistance

Active Publication Date: 2022-04-01
中国电子新能源(武汉)研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods have improved the fast charging capacity and fast charging cycle performance of the battery to a certain extent, but the improvement effect is limited, and LiFSI is used as the electrolyte. The cost of LiFSI is high, which is not conducive to reducing costs and cannot meet practical applications. needs

Method used

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  • Secondary battery electrolyte, preparation method thereof, and battery
  • Secondary battery electrolyte, preparation method thereof, and battery
  • Secondary battery electrolyte, preparation method thereof, and battery

Examples

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Effect test

Embodiment 1

[0030] An electrolyte solution for secondary batteries, using ethylene carbonate, dimethyl carbonate, bis(2,2-difluoroethyl)ether and trichloroethane as solvents, the volume ratio of the four solvents is 1:1:0.2 : 0.2.

[0031] Using LiPF 6 As an electrolyte, lithium nitrate and sulfur dioxide are also included in the secondary battery electrolyte.

[0032] The steps of preparing the above secondary battery electrolyte are as follows:

[0033] S1. Weigh 1000ml of ethylene carbonate, 1000ml of dimethyl carbonate, 200ml of bis(2,2-difluoroethyl) ether and 200ml of trichloroethane, and add them into the reaction flask for mixing and stirring, keeping the temperature at 20°C , and stir evenly to obtain the first mixture;

[0034] S2, add LiPF again in the first mixture 6 , keeping the temperature in the reaction flask at 20°C, add to LiPF 6 The molar concentration of reaches 0.8mol / L, obtains the second mixture;

[0035] S3, adding lithium nitrate to the second mixture, keep...

Embodiment 2

[0039] An electrolyte solution for a secondary battery, using propylene carbonate, diethyl carbonate, bis(2,2,2-trifluoroethyl)ether and tetrachloroethane as solvents, and the volume ratio of the four solvents is 1:1 :0.4:0.4.

[0040] Using LiPF 6 As an electrolyte, sodium nitrate and sulfur dioxide are also included in the secondary battery electrolyte.

[0041] The steps of preparing the above secondary battery electrolyte are as follows:

[0042] S1. Weigh 1000ml propylene carbonate, 1000ml diethyl carbonate, 400ml bis(2,2,2-trifluoroethyl) ether and 400ml tetrachloroethane respectively, add them to the reaction flask for mixing and stirring, and keep the temperature at 22°C, stir evenly to obtain the first mixture;

[0043] S2, add LiPF again in the first mixture 6 , keeping the temperature in the reaction flask at 22°C, add to LiPF 6 The molar concentration of reaches 1.2mol / L, obtains the second mixture;

[0044] S3. Add sodium nitrate to the second mixture, keep ...

Embodiment 3

[0048]An electrolyte solution for a secondary battery, using ethyl methyl carbonate, bis(2-fluoroethyl) ether, bis(1-fluoro-2,2,2-trifluoroethyl) ether, dichloroethane and ethyl chloride Alkanes are used as solvents, and the volume ratio of the five solvents is 1:0.2:0.3:0.2:0.3.

[0049] Using LiPF 6 As an electrolyte, lithium nitrite and sulfur dioxide are also included in the secondary battery electrolyte.

[0050] The steps of preparing the above secondary battery electrolyte are as follows:

[0051] S1. Weigh 1000ml ethyl methyl carbonate, 200ml bis(2-fluoroethyl) ether, 300ml bis(1-fluoro-2,2,2-trifluoroethyl) ether, 200ml dichloroethane and 300ml chlorine Add ethane into the reaction flask for mixing and stirring, keep the temperature at 24°C, and stir evenly to obtain the first mixture;

[0052] S2, add LiPF again in the first mixture 6 , keeping the temperature in the reaction flask at 24°C, add to LiPF 6 The molar concentration of reaches 1.6mol / L, obtains the s...

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Abstract

The present invention proposes a secondary battery electrolyte, a preparation method thereof and a battery, wherein the electrolyte includes a solvent, an electrolyte, and an additive, wherein the solvent includes carbonate, fluorinated ether, and chloroalkane; the additive includes nitrate and sulfur dioxide . The solvent and the additive of the present invention can play a synergistic effect and change the solvation structure of the electrolyte. On the one hand, it can improve the conductivity of the electrolyte and reduce the migration resistance of electrolyte cations, thereby reducing the polarization of the battery during fast charging and improving Fast charge capacity; on the other hand, it can inhibit solvent co-intercalation, thereby improving the fast charge cycle performance of the battery. The additive of the present invention can participate in the SEI film-forming reaction on the surface of the negative electrode during charging, making the SEI film more stable, thereby further improving the fast charging cycle performance of the battery. The technical problems of low fast-charging capacity, fast-charging cycle capacity attenuation, and short life of the battery are solved through the joint action of each component. The invention also provides a preparation method of the electrolyte and a battery containing the electrolyte.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a secondary battery electrolyte, a preparation method thereof and a battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long life, no memory effect, and environmental friendliness, and have been widely used in electronic products and electric vehicles. However, due to the long charging time of lithium-ion batteries, the use of related products is limited. The development of fast charging technology has become a research hotspot in recent years. [0003] Under fast charging conditions, lithium-ion batteries will have problems such as low charging capacity, fast capacity decay, and short cycle life. It is found through research that the development of fast charging electrolyte is the key to solve the above problems. The prior art discloses various fast charging electrolytes. For example, LiFSI is used as electrolyte, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCY02E60/10
Inventor 孟庆飞杨帆吴际良徐谦曾辉辉陈泽琦刘崯海李立新佘有缘高泽金欧阳才校
Owner 中国电子新能源(武汉)研究院有限责任公司
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