Electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of a wide variety of materials and complex preparation, and achieve the effects of improving rate and cycle performance, reducing battery internal resistance, and improving rate performance and cycle performance

Pending Publication Date: 2022-03-08
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CN113363557A has a certain degree of improvement, the preparation is complicated and there are many kinds of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment provides an electrolytic solution, the electrolytic solution includes an electrolyte, a solvent and an additive; the additive includes a first additive and a second additive, and the quality of the additive is 3.1wt% of the mass of the electrolytic solution; the electrolyte is lithium hexafluorophosphate and lithium bisfluorosulfonyl imide, the mass ratio is 9:3, and the concentration of the electrolyte in the electrolyte is 1.2mol / L; the solvent is ethylene carbonate, methyl carbonate with a mass ratio of 3:4:3 ethyl ester and dimethyl carbonate.

[0060] The first additive is vinylene carbonate and lithium difluorophosphate, and the quality is respectively 10wt% and 16wt% of the additive mass; the second additive is tris(trimethylsilane) phosphite, fluoroethylene carbonate and ethylene sulfate, the mass is respectively 10wt%, 48wt% and 16wt% of the additive mass.

[0061] The preparation method of described electrolyte comprises the steps:

[0062] m...

Embodiment 2

[0064] This embodiment provides a kind of electrolytic solution, and described electrolytic solution comprises electrolyte, solvent and additive; Described additive comprises first additive and second additive, and the quality of described additive is 3.8wt% of electrolyte mass; Said electrolyte It is lithium hexafluorophosphate and lithium bisfluorosulfonimide, the mass ratio is 8:2, and the concentration of the electrolyte in the electrolyte is 1.1mol / L; the solvent is ethylene carbonate, carbonic acid with a mass ratio of 3:5:2 Methyl ethyl ester and propylene carbonate.

[0065] The first additive is vinylene carbonate and lithium difluorophosphate, the quality of which is 9wt% and 12wt% of the additive mass respectively; the second additive is tris(trimethylsilane) phosphite, fluoroethylene carbonate and lithium difluorooxalate borate, the mass is 10wt%, 52wt% and 17wt% of the additive mass respectively.

[0066] The preparation method of described electrolyte comprises ...

Embodiment 3

[0069] This embodiment provides a kind of electrolytic solution, and described electrolytic solution comprises electrolyte, solvent and additive; Described additive comprises first additive and second additive, and the quality of described additive is 3.6wt% of electrolytic solution mass; Said electrolyte It is lithium hexafluorophosphate and lithium bisfluorosulfonimide, the mass ratio is 10:4, and the concentration of the electrolyte in the electrolyte is 1.3mol / L; the solvent is dimethyl carbonate, Methyl ethyl carbonate and propylene carbonate.

[0070] The first additive is vinylene carbonate and lithium difluorophosphate, and the quality of the additives is 12wt% and 18wt% respectively; the second additive is tris(trimethylsilane) phosphite, fluoroethylene carbonate , lithium difluorooxalate borate and ethylene sulfate, the mass of which is 10wt%, 44wt%, 8wt% and 8wt% of the additive mass respectively.

[0071] The preparation method of described electrolyte comprises t...

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Abstract

The invention relates to an electrolyte, a preparation method thereof and a lithium ion battery. The electrolyte comprises an electrolyte, a solvent and an additive; the additives comprise a first additive and a second additive; the first additive comprises vinylene carbonate and / or lithium difluorophosphate; and the second additive comprises any one or a combination of at least two of tris (trimethylsilane) phosphite ester, fluoroethylene carbonate, lithium difluoro (oxalato) borate or ethylene sulfate. According to the electrolyte prepared through a selective formula of the first additive and the second additive, the rate capability and the cycle performance of the lithium ion battery at low temperature can be effectively improved. According to the lithium ion battery provided by the invention, by improving the formulas of the positive electrode, the negative electrode and the electrolyte, the internal resistance of the battery at a low temperature is effectively reduced, and the rate and the cycle performance of the battery at the low temperature are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrolyte, in particular to an electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used due to their light weight, high energy density, small self-discharge, long life, high discharge power and environmental protection. Lithium-ion batteries include four major material parts: positive electrode, negative electrode, diaphragm and electrolyte. These four major material parts directly affect the performance of lithium-ion batteries. Under low temperature conditions below -20°C, as the viscosity of the electrolyte increases, the conductivity decreases, which increases the impedance and charge transfer impedance of the interface between the electrolyte and the electrode. Especially when charging at low temperature and high rate, lithium metal will be precipitated and deposited on the nega...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 谭立波高夜军阮祝华苑丁丁
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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