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A kind of electrolytic solution, preparation and application of stabilizing silicon carbon surface of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as battery flatulence and affecting battery safety performance

Active Publication Date: 2020-10-27
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluoroethylene carbonate and ethylene carbonate are easy to reduce and decompose under the action of an electric field to generate gas, which will cause battery flatulence and affect battery safety performance

Method used

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  • A kind of electrolytic solution, preparation and application of stabilizing silicon carbon surface of lithium ion battery
  • A kind of electrolytic solution, preparation and application of stabilizing silicon carbon surface of lithium ion battery
  • A kind of electrolytic solution, preparation and application of stabilizing silicon carbon surface of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0033] An electrolyte for stabilizing the silicon carbon surface of a lithium ion battery, comprising the following raw materials: 90 g of ethylene carbonate, 60 g of diethyl carbonate, 120 g of dimethyl carbonate, 30 g of fluoroethylene carbonate, and 39.6 g of lithium hexafluorophosphate .

[0034] The battery system is a 2025 button battery, silicon carbon (capacity 600 mAh g -1 ) / metal lithium; soft pack battery, lithium nickel cobalt aluminate / silicon carbon (capacity 450 mAh g -1 ).

[0035] As a film-forming additive, fluoroethylene carbonate can form an effective solid-state electrolyte film on the surface of the electrode, and the battery capacity fluctuates significantly during the cycle of the button and pouch batteries. This is due to the poor compactness and uniformity of the SEI film, and the cycle process The middle SEI film is ruptured, resulting in the co-intercalation and reduction of the electrolyte solvent to form a new SEI film.

Embodiment 2

[0037] An electrolyte for stabilizing the silicon carbon surface of a lithium ion battery, comprising the following raw materials: 90 g of ethylene carbonate, 60 g of diethyl carbonate, 120 g of dimethyl carbonate, 30 g of fluoroethylene carbonate, dimethyl carbonate Dimethoxysilane 1.6 g, lithium hexafluorophosphate 39.6 g, battery system is 2025 button cell, silicon carbon (capacity 600 mAh g -1 ) / metal lithium; soft pack battery, lithium nickel cobalt aluminate / silicon carbon (capacity 450 mAh g -1 ).

[0038] When 0.5% dimethoxydimethylsilane was used as a coating additive, the cycle stability of the battery was significantly enhanced compared with Example 1, and there was no fluctuation during the cycle. Compared with Example 1, the first charge-discharge efficiency and the second charge-discharge efficiency during the formation of the full battery of the soft pack are significantly improved.

Embodiment 3

[0040] An electrolyte for stabilizing the silicon carbon surface of a lithium-ion battery, comprising the following raw materials: 90 g of ethylene carbonate, 60 g of diethyl carbonate, 120 g of dimethyl carbonate, 30 g of fluoroethylene carbonate, dimethyl carbonate 3.2 g of dimethoxysilane and 39.6 g of lithium hexafluorophosphate. The battery system is 2025 button battery, silicon carbon 600 / metal lithium; soft pack battery, nickel cobalt aluminate / silicon carbon (capacity 450 mAh g -1 ).

[0041]When 1% dimethyldimethoxysilane is used as an additive, the battery cycle process has a stable capacity without fluctuation, and the capacity retention rate is improved compared with Example 1. The initial charge and discharge efficiency of the pouch battery is higher than that of Examples 1 and 2. After cycling, the electrode sheet is less wrinkled and the interface is stable.

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Abstract

The invention provides an electrolyte for stabilizing a silicon-carbon surface of lithium ion battery and a preparation method thereof, and application of an electrolyte for stabilizing a silicon-carbon surface of lithium ion battery. The electrolyte comprises a solvent, a lithium salt and an additive, the additive comprises a film forming agent and a film decoration additive, the film forming agent is fluoroethylene carbonate, and the film decoration additive is at least one of dimethoxydimethylsilane and allyloxytrimethylsilane. The stability of the silicon carbon electrode of the lithium ion battery can be improved, and the continuous decomposition of the electrolyte on the surface of the electrode can be reduced, thereby reducing the internal resistance and polarization phenomena of the battery and improving the cycling stability of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte for stabilizing the silicon carbon surface of lithium ion batteries, preparation and application thereof. Background technique [0002] Since its commercialization in the 1990s, lithium-ion batteries have been rapidly used in portable communication equipment, energy storage equipment, electric vehicles and aviation due to their advantages of light weight, small size, high energy density, no memory effect, and low self-discharge. aerospace and other fields. Especially in the field of new energy vehicles, lithium-ion batteries are the most potential power batteries. The silicon carbon material has a high gram capacity, which can greatly improve the energy density of the battery and reduce the weight of the car by replacing the traditional graphite. However, the cyclic stability of silicon carbon materials is poor, the volume expansion is obvious durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 张锁江王恩阳刘艳侠张兰李蒙张若涛
Owner 郑州中科新兴产业技术研究院
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