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Electrolyte for stabilizing silicon-carbon surface of lithium ion battery and preparation method thereof, and application of electrolyte for 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 affect battery safety performance, and achieve the effects of reducing corrosion, reducing lithium precipitation, and reducing gas production

Active Publication Date: 2019-08-30
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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  • Electrolyte for stabilizing silicon-carbon surface of lithium ion battery and preparation method thereof, and application of electrolyte for stabilizing silicon-carbon surface of lithium ion battery
  • Electrolyte for stabilizing silicon-carbon surface of lithium ion battery and preparation method thereof, and application of electrolyte for stabilizing silicon-carbon surface of lithium ion battery
  • Electrolyte for stabilizing silicon-carbon surface of lithium ion battery and preparation method thereof, and application of electrolyte for stabilizing silicon-carbon surface of lithium ion battery

Examples

Experimental program
Comparison scheme
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; pouch 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 electrode surface, and the battery capacity fluctuates significantly during the cycle of button and pouch batteries. This is due to the poor density and uniformity of the SEI film. The rupture of the SEI film in the medium causes the electrolyte solvent to co-embed and reduce 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 Dimethoxysilane 1.6 g, lithium hexafluorophosphate 39.6 g, the battery system is a 2025 button battery, silicon carbon (capacity 600 mAh g -1 ) / metal lithium; pouch battery, lithium nickel cobalt aluminate / silicon carbon (capacity 450 mAh·g -1 ).

[0038] When 0.5% dimethoxydimethylsilane was used as a decorative film additive, the cycle stability of the battery was significantly enhanced compared with Example 1, and there was no fluctuation in the cycle process. Compared with Example 1, the first charge and discharge efficiency and the second charge and discharge efficiency in the formation process of the soft pack full battery 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 Dimethoxysilane 3.2 g, lithium hexafluorophosphate 39.6 g. The battery system is 2025 button battery, silicon carbon 600 / lithium metal; pouch battery, nickel cobalt lithium 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 a lithium-ion battery, its preparation and its application. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have been rapidly used in portable communication devices, energy storage devices, electric vehicles and aviation due to their advantages such as light weight, small size, high energy density, no memory effect, and small self-discharge. Aerospace and other fields. Especially in the field of new energy vehicles, lithium-ion batteries are the most potential power batteries. Silicon carbon materials have a high gram capacity, and replacing traditional graphite can greatly increase the energy density of batteries and reduce the weight of vehicles. However, the cycle stability of silicon carbon materials is poor, the volume expansion is obvious during...

Claims

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Application Information

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Patent Type & Authority Applications(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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