Silicon negative electrode lithium battery electrolyte

A lithium battery and electrolyte technology, which is applied in the field of silicon anode lithium battery electrolyte, can solve the problems of decreased cycle performance of silicon anode lithium ion battery, loss of electrical contact of electrode materials, alloy powdering or cracks, etc., to reduce battery flatulence, Not easy to solidify and improve performance

Inactive Publication Date: 2016-11-23
NINGBO VEKEN BATTERY
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a silicon negative electrode as the negative electrode of a lithium-ion battery, during the charge-discharge cycle, the reversible formation and decomposition of the Li-Si alloy is accompanied by a huge volume change, which will cause the powdering or cracking of the alloy, resulting in the collapse of the silicon material and the electrode material. The peeling off of the electrode material causes the electrode material to lose electrical contact, resulting in a sharp decline in the cycle performance of the silicon negative lithium-ion battery
At the same time, due to the occurrence of side reactions, a large amount of gas will be generated during the charging and discharging process, and it is easy to swell inside the battery.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The electrolyte solution used in the silicon negative electrode lithium battery in this embodiment is composed of lithium salt, solvent and additives, wherein the molar concentration of lithium salt is 0.005 mol / liter, in parts by mass, and the additives are composed of the following components : 10 parts of triethoxymethyltrimethoxysilicone isocyanate, 10 parts of ethoxylated alkyl sodium sulfate, 5 parts of biphenyl, 5 parts of cyclohexylbenzene, 2 parts of fatty alcohol polyoxyethylene ether, t-amyl 2 parts of benzene, 2 parts of adiponitrile; the solvent is a mixture of fluorocarboxylate and carbonate organic solvents. The molar concentrations of the components added in the additives in this embodiment are all 0.001 mol / liter. Lithium salt is LiClO 4 、LiPF 6 and LiAsF 6 mixture. The carbonate organic solvent in the solvent is a mixture of ethylene carbonate, propylene carbonate and butylene carbonate.

Embodiment 2

[0014] The electrolyte solution used in the silicon negative electrode lithium battery in this embodiment is composed of lithium salt, solvent and additives, wherein the molar concentration of lithium salt is 2 mol / liter, in parts by mass, and the additives are composed of the following components : 20 parts of triethoxymethyltrimethoxysilicone isocyanate, 15 parts of sodium ethoxylated alkyl sulfate, 8 parts of biphenyl, 8 parts of cyclohexylbenzene, 5 parts of fatty alcohol polyoxyethylene ether, t-amyl 5 parts of base benzene, 4 parts of adiponitrile; the solvent is a mixture of fluorocarboxylate and ether organic solvents. The molar concentrations of the components added in the additives are all 0.25 mol / liter. Lithium salt is LiPF 6 , LiAsF 6 and LiSO 3 F mix. The ether organic solvent in the solvent is a mixture of tetrahydrofuran, 2-methyltetrahydrofuran and dimethoxymethane.

Embodiment 3

[0016] The electrolyte solution used in the silicon negative electrode lithium battery in this embodiment is composed of lithium salt, solvent and additives, wherein the molar concentration of lithium salt is 3 mol / liter, in parts by mass, and the additives are composed of the following components : 30 parts of triethoxymethyltrimethoxysilicone isocyanate, 20 parts of sodium ethoxylated alkyl sulfate, 10 parts of biphenyl, 10 parts of cyclohexylbenzene, 8 parts of fatty alcohol polyoxyethylene ether, t-amyl 8 parts of base benzene, 6 parts of adiponitrile; the solvent is a mixture of carbonate organic solvents and ether organic solvents. The molar concentrations of the components added in the additives were all 0.5 mol / liter. Lithium salt is LiAsF 6 , LiSO 3 F and LiCF 3 SO 3 in the mixture. The carbonate organic solvent in the solvent is a mixture of diethyl carbonate, dipropyl carbonate and methyl ethyl carbonate; the ether organic solvent is a mixture of dimethoxymetha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a silicon negative electrode lithium battery electrolyte comprising a lithium salt, a solvent and an additive, the molar concentration of the lithium salt is 0.005-3 mol/L, the additive comprises following components by mass: 10-30 parts of triethoxy methyl trimethoxysilane isocyanate, 10-20 parts of sodium ethoxylated alkyl sulfate, 5-10 parts of biphenyl, 5-10 parts of cyclohexyl benzene, 2-8 parts of fatty alcohol polyoxyethylene ether, 2-8 parts of tert amylbenzene and 2-6 parts of adiponitrile; and the solvent is a mixture of one or a plurality of substances of fluoro carboxylic ester, a carbonate organic solvent and an ether organic solvent. The silicon negative electrode lithium battery electrolyte can improve the cycle life of an electrode, reduces side reaction, thereby reducing battery gas expansion and prolonging the cycle life of a battery.

Description

technical field [0001] The invention relates to an electrolyte solution for a silicon negative electrode lithium battery, belonging to the technical field of lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, no pollution, no memory effect, and long life. They are widely used in portable electrical devices such as mobile phones, digital cameras, and notebook computers. At the same time, they are used as an alternative energy source for petroleum in electric vehicles. And hybrid vehicles will also be applied on a large scale. Silicon anode has a large lithium storage capacity and is abundant in the earth, making it an ideal anode material for lithium-ion batteries. Using a silicon negative electrode as the negative electrode of a lithium-ion battery, during the charge-discharge cycle, the reversible formation and decomposition of the Li-Si alloy is accompanied by a huge volume change, whi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 潘美姿刘旭赵亚孙晓辉
Owner NINGBO VEKEN BATTERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap