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Electrolyte and preparation method thereof and battery

An electrolyte and electrolyte technology, applied in electrolytes, secondary batteries, organic electrolytes, etc., can solve problems such as inapplicability in deep and low temperature environments, reduce ion migration resistance, improve discharge performance and cycle performance, and improve ionic conductivity. Effect

Active Publication Date: 2019-11-08
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 low-temperature performance of the battery at -10°C to -30°C, but because they still use solvents with high melting points, they are not suitable for deep low-temperature environments below -40°C

Method used

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  • Electrolyte and preparation method thereof and battery
  • Electrolyte and preparation method thereof and battery
  • Electrolyte and preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An electrolyte solution, its components include ethyl acetate and chloroform, ethyl acetate and chloroform are used as solvents, and the volume ratio of ethyl acetate and chloroform is 1:2.

[0031] The electrolyte composition also includes electrolyte and additives, the electrolyte is NaPF 6 , the additives include potassium salt additives and AgPF 6 , the potassium salt additive is potassium sulfate, the concentration of potassium sulfate is 0.1mol / L, AgPF 6 The concentration is 0.01mol / L.

[0032] The preparation method of above-mentioned electrolytic solution, comprises the following steps:

[0033] S1. Mix ethyl acetate and chloroform with a volume ratio of 1:2 at a temperature of 25° C.;

[0034] S2. Add electrolyte, potassium sulfate and AgPF 6 , and mix evenly to obtain the electrolyte.

Embodiment 2

[0036] An electrolyte whose components include ethyl propionate and chloroform, ethyl acetate and chloroform as solvents, and the volume ratio of ethyl acetate and chloroform is 1:1.5.

[0037] The electrolyte composition also includes electrolyte and additives, the electrolyte is NaPF 6 , the additives include potassium salt additives and AgPF 6 , the potassium salt additive is potassium carbonate, the concentration of potassium carbonate is 0.15mol / L, AgPF 6 The concentration is 0.01mol / L.

[0038] The preparation method of above-mentioned electrolytic solution, comprises the following steps:

[0039] S1. Mix ethyl propionate and chloroform with a volume ratio of 1:1.5 at a temperature of 25°C;

[0040] S2. Add electrolyte, potassium carbonate and AgPF 6 , and mix evenly to obtain the electrolyte.

Embodiment 3

[0042] A kind of electrolytic solution, its component comprises methyl acetate, ethyl acetate and methylene chloride, methyl acetate, ethyl acetate and methylene chloride are as solvent, the volume ratio of methyl acetate, ethyl acetate and methylene chloride is 1:1:3.

[0043] The electrolyte composition also includes electrolyte and additives, the electrolyte is NaPF 6 , the additives include potassium salt additives and AgPF 6 , the potassium salt additive is potassium sulfite, the concentration of potassium sulfite is 0.05mol / L, AgPF 6 The concentration is 0.01mol / L.

[0044] The preparation method of above-mentioned electrolytic solution, comprises the following steps:

[0045] S1. Mix methyl acetate, ethyl acetate and dichloromethane with a volume ratio of 1:1:3 at a temperature of 25°C;

[0046] S2. Add electrolyte, potassium sulfite and AgPF 6 , and mix evenly to obtain the electrolyte.

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PUM

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Abstract

The invention discloses an electrolyte, which comprises carboxylic ester and halogenated methane. The carboxylic ester can be combined with cations of the electrolyte, haloalkane has a small volume, arole of a lubricant can be played, ion migration resistance is reduced, and ionic conductivity of the electrolyte is thus improved. A potassium salt additive can change the solvation condition of thecations inside the electrolyte and an electrode interface film-forming reaction form, a thin and stable SEI film can be formed on the surface of a negative electrod, and the resistance of the ions embedded in the negative electrode can be reduced. An AgPF6 additive can perform reduction on the surface of the negative electrode to form nano-Ag particles, the SEI film charge transfer impedance is reduced, and the ion embedding / de-embedding resistance is reduced. Through combined actions of the carboxylic ester, the halogenated methane, the electrolyte and the additives, the discharge performance and the cycle performance of the battery below -40 DEG C can be improved, and the battery can perform discharge in a deep low temperature environment of -70 DEG C. The invention also provides an electrolyte preparation method and a battery containing the electrolyte.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte, a preparation method thereof and a battery. Background technique [0002] At present, lithium-ion batteries and sodium-ion battery electrolytes generally use carbonate solvents, and carbonates have a high melting point, and the viscosity increases significantly in low temperature environments, and the conductivity decreases, resulting in battery performance degradation. The development of low-temperature electrolytes is the key to improving the low-temperature performance of secondary batteries. [0003] An electrolyte is disclosed in the prior art, which uses carbonates and amides as solvents and lithium salt additives to improve the low-temperature performance of the battery at -10°C. Another electrolyte, using high boiling point organic solvents, carbonate solvents, aromatic hydrocarbon organic solvents, and carbonate-based additives, improves the discharge,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/42H01M10/0525H01M10/054
CPCH01M10/0525H01M10/054H01M10/0566H01M10/0567H01M10/4235H01M2300/0025H01M2300/0091Y02E60/10
Inventor 孟庆飞乐琦孔维和
Owner 中国电子新能源(武汉)研究院有限责任公司
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