Silane compound modified SiO anode material as well as preparation method and application thereof

A technology of silane compound and negative electrode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of fast capacity decay, achieve the effect of inhibiting swelling and pulverization, improving cycle performance, and facilitating commercialization

Active Publication Date: 2015-08-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a silane compound-modified SiO negative electrode material and its preparation method and application. By modifying a layer of organic silicon compound on the surface of the material, the problem of rapid capacity decay caused by the pulverization of the silicon material during charge and discharge can be solved.

Method used

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  • Silane compound modified SiO anode material as well as preparation method and application thereof
  • Silane compound modified SiO anode material as well as preparation method and application thereof
  • Silane compound modified SiO anode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Hydrolyze 0.15g of γ-aminopropyltriethoxysilane in water, drop a small amount of oxalic acid to make it weakly acidic; put 5g of SiO in a mixture of 60mL of ethanol and water (ethanol: water = 5:1) for 30min, It is then blended with hydrolyzed γ-(methacryloyloxy)propyltrimethoxysilane. Inert gas is introduced, and the flow rate is controlled at 100~300 mL / min (the flow rate is too small to ensure the inert atmosphere of the internal reaction, and the air flow is too large, which is easy to splash the liquid.), and the reaction is carried out by magnetic stirring at 80°C under the reflux device for 6 hours. Dry at 80° C. for 12 hours to obtain a SiO material with a modified layer of γ-aminopropyltriethoxysilane.

[0035] After being modified by γ-aminopropyltriethoxysilane, its initial charge specific capacity is 1272.99mAh / g, and its initial efficiency is 75.11%; after 100 cycles, its charge specific capacity is 934.37mAh / g, and its capacity retention rate is 73.39% %....

Embodiment 2

[0037] Hydrolyze 0.15g of vinyltriethoxysilane in water, drop a small amount of oxalic acid to make it weakly acidic; put 5g of SiO in a mixture of 60mL of ethanol and water (ethanol: water = 5:1) for 30min, and then mix with Hydrolyzed γ-(methacryloyloxy)propyltrimethoxysilane blended. Inert gas was introduced, the flow rate was controlled at 100-300 mL / min, the reaction was carried out under magnetic stirring at 80°C for 6h under reflux device, and the SiO material with vinyltriethoxysilane modified layer was obtained by drying at 80°C for 12h.

[0038] After being modified by vinyltriethoxysilane, its initial charge specific capacity is 1388.56mAh / g, and its initial efficiency is 78.13%; after 100 cycles, its charge specific capacity is 1030.04mAh / g, and its capacity retention rate is 74.18%.

Embodiment 3

[0040]Hydrolyze 0.15g of γ-glycidyl etheroxypropyltrimethoxysilane in water, add a small amount of oxalic acid dropwise to make it weakly acidic; put 5g of SiO in a mixture of 60mL ethanol and water (ethanol: water = 5:1) ultrasonically 30min, and then blended with hydrolyzed γ-(methacryloyloxy)propyltrimethoxysilane. Inert gas was introduced, the flow rate was controlled at 100-300 mL / min, and the reaction was carried out under a reflux device with magnetic stirring at 80°C for 6h, and dried at 80°C for 12h to obtain a SiO material with a modified layer of γ-glycidyl etheroxypropyltrimethoxysilane.

[0041] After being modified by γ-glycidyl etheroxypropyl trimethoxysilane, its initial charge specific capacity is 1267.02mAh / g, and its initial efficiency is 74.18%; after 100 cycles, its charge specific capacity is 899.22mAh / g, and the capacity retention rate It was 70.97%.

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Abstract

The invention discloses a silane compound modified SiO anode material as well as a preparation method and the application thereof, wherein the material takes SiO as a substrate, and the substrate is modified by a layer of silane compound. The preparation method comprises the steps of 1, hydrolyzing the silane compound to enable the chemical bonds of a coupling agent connected with silicon atoms to be hydrolyzed and generate siloxane with low degree of polymerization, and carrying out ultrasonic treatment on SiO powder in water-alcohol mixed liquid; 2, mixing the hydrolyzed silane compound with the SiO, and carrying out reflux heating reaction in the atmosphere of inert gas; and 3, centrifuging the mixed solution, and then carrying out vacuum drying. The SiO anode material with the silane compound modification layer can be mixed with graphite so as to be used as the anode material for a lithium-ion battery. The surface of the material is modified by the silane compound, so that the problem of rapid capacity fading caused by powdering of the silicon material in the charge and discharge processes can be solved. The process route adopted by the invention is convenient, simple and easy to operate; furthermore, the needed material is low in cost, so that the silane compound modified SiO anode material is favorably produced in a factory on a large scale.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacture and electrochemical reaction, and relates to a lithium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have many attractive advantages since their inception, such as high energy density, long cycle life, high output voltage, small self-discharge, light weight, environmental protection, etc., and are widely used in electronic devices. However, with the continuous development of electric vehicles, new energy storage and other fields, there are higher requirements for the performance of lithium-ion batteries. Commercial lithium-ion batteries mostly use graphite with good cycle stability as the negative electrode material, but its theoretical specific capacity is very low, only 372mAh / g, which is difficult to meet people's requirements for high capacity. [0003] SiO anode material ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/139
CPCH01M4/139H01M4/60Y02E60/10
Inventor 高云智颜世银马刊王龙尹鸽平
Owner HARBIN INST OF TECH
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