High-stability lithium ion battery electrolyte and battery containing electrolyte

A lithium-ion battery, high stability technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problem of high moisture free acid, achieve the effect of reducing reaction activity, reducing side reactions, and increasing internal resistance

Pending Publication Date: 2020-09-25
HUBEI JIUBANG NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems mentioned in the background technology, the present invention forms a high-stability lithium-ion battery electrolyte by adding a stabilizer in the lithium-ion battery electrolyte, so as to solve the problem of moisture, free and high acidity problem

Method used

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  • High-stability lithium ion battery electrolyte and battery containing electrolyte
  • High-stability lithium ion battery electrolyte and battery containing electrolyte
  • High-stability lithium ion battery electrolyte and battery containing electrolyte

Examples

Experimental program
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Effect test

Embodiment

[0027] Example (electrolyte 1)

[0028] In a glove box filled with argon (moisture <10ppm, oxygen <10ppm), according to ethylene carbonate (EC): ethyl methyl carbonate (EMC): diethyl carbonate (DEC) = 1:1:1 (mass ratio) Prepare a mixed solution, slowly add 1 mol of lithium hexafluorophosphate and hexamethyldisilazane (HMDS) to the mixed solution, the mass ratio of lithium hexafluorophosphate to the electrolyte is 12.5wt%, and hexamethyldisilazane (HMDS) accounts for The liquid mass ratio is 0.5wt%, and the mixture is evenly stirred. The electrolyte was stored at a high temperature of 60 ℃ / 24h, and the moisture content of the electrolyte was measured with a Metrohm KF-831 (Swiss Metrohm) coulometric moisture tester, and a Metrohm877 (Swiss Metrohm) potentiometric titrator was used to measure the electrolyte. Determination of free acid content (calculated as HF).

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Abstract

The invention provides a high-stability lithium ion battery electrolyte and a battery containing the electrolyte. The lithium ion battery electrolyte comprises an electrolyte lithium salt, a lipid solvent and a high-voltage stabilizer, and the electrolyte is prepared by mixing the components according to a certain proportion. The electrolyte stabilizer is hexamethyldisilazane, and the electrolytelithium salt is lithium hexafluorophosphate, wherein the electrolyte lithium salt accounts for 12.5 wt% of the mass of the electrolyte, and the hexamethyldisilazane accounts for 0.3-0.8 wt% of the mass of the electrolyte. The invention also discloses a battery containing the lithium ion battery electrolyte. According to the present invention, the hydrolysis and pyrolysis of LiPF6 in the storage process of the electrolyte can be inhibited, the content of H2O and HF in the electrolyte can be effectively reduced, and the rapid increase of the acidity and the chromaticity of the electrolyte underthe high temperature condition can be inhibited so as to improve the storage stability and the thermal stability of the lithium ion electrolyte and improve the electrochemical performance and the cycle performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium secondary batteries, and in particular relates to a highly stable lithium ion battery electrolyte and a battery containing the electrolyte. Background technique [0002] As a new energy source, lithium-ion batteries have unique advantages such as high specific energy, high working voltage, wide application range, low self-discharge rate, long cycle life, no pollution, and good safety performance. Now they have gradually replaced traditional batteries in many fields. Batteries are widely used. Therefore, Li-ion batteries have attracted much attention in modern electrochemistry. [0003] Non-aqueous electrolyte is an important part of lithium-ion secondary batteries. It plays the role of transferring charge between the positive and negative electrodes in the battery, and is crucial to the specific capacity, operating temperature range, cycle efficiency and safety performance of the battery. During the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0583H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0583Y02E60/10Y02P70/50
Inventor 段俊峰周云鹏
Owner HUBEI JIUBANG NEW ENERGY TECH
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