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Lithium ion anode material SiO2@SnO2 with coated structure and preparation method and application thereof

A technology of negative electrode material and coating structure, which is applied in the field of SiO2@SnO2 coating structure lithium ion negative electrode material and its preparation, can solve the problems of poor conductivity, poor battery cycle performance, cracking and the like, and achieves a simple preparation process and good cycle performance. Effect

Active Publication Date: 2016-09-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, SnO 2 As a lithium-ion battery negative electrode material, it also has certain defects. For example, there will be obvious volume expansion during charging and discharging, which will cause the electrode material to fall off and crack, making the cycle performance of the battery relatively poor. In addition, SnO 2 poor electrical conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh SiO with a size of 200nm 2 Powder 0.1g; add to 160mL absolute ethanol, ultrasonically disperse for 60min to obtain a mixed solution;

[0029] (2) Take by weighing 0.8g tin tetrachloride pentahydrate again, join in the mixed solution, magnetically stir 5min under normal temperature;

[0030] (3) Pour the mixed solution into a polytetrafluoroethylene-lined stainless steel autoclave, then put it in a vacuum drying oven, and conduct a hydrothermal reaction at 160° C. for 12 hours;

[0031] (4) When the temperature of the reaction kettle drops to room temperature, the product is collected by centrifugation and washed twice with absolute ethanol;

[0032] (5) SiO was obtained after drying at 90°C for 20h 2 @SnO 2 Coated structure lithium ion negative electrode material.

[0033] The composition structure of the composite material was determined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the morphology characteristics of the compos...

Embodiment 2

[0035] (1) Weigh SiO with a size of 200nm 2 0.1g of powder to obtain a mixed powder; add it to 160mL of absolute ethanol, and ultrasonically disperse for 30min to obtain a mixed solution;

[0036] (2) Take by weighing 0.8g tin tetrachloride pentahydrate again, join in the mixed solution, magnetic stirring 15min under normal temperature;

[0037] (3) Pour the mixed solution into a polytetrafluoroethylene-lined stainless steel autoclave, then put it in a vacuum drying oven, and conduct a hydrothermal reaction at 180° C. for 16 hours;

[0038] (4) When the temperature of the reaction kettle drops to room temperature, the product is collected by centrifugation and cleaned with absolute ethanol;

[0039] (5) SiO was obtained after drying at 85°C for 24h 2 @SnO 2 Coated structure lithium ion negative electrode material.

[0040] The composition structure of the composite material was determined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the morpho...

Embodiment 3

[0042] (1) Weigh SiO with a size of 200nm 2 0.1g of powder to obtain a mixed powder; add it to 160mL of absolute ethanol, and ultrasonically disperse for 90min to obtain a mixed solution;

[0043] (2) Take by weighing 0.8g tin tetrachloride pentahydrate again, join in the mixed solution, magnetically stir 10min under normal temperature;

[0044] (3) Pour the mixed solution into a polytetrafluoroethylene-lined stainless steel autoclave, then put it in a vacuum drying oven, and conduct a hydrothermal reaction at 200° C. for 24 hours;

[0045] (4) When the temperature of the reaction kettle drops to room temperature, the product is collected by centrifugation and cleaned with absolute ethanol;

[0046] (5) SiO was obtained after drying at 95°C for 10 h2 @SnO 2 Coated structure lithium ion negative electrode material.

[0047] The composition structure of the composite material was determined by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the morphol...

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Abstract

The present invention belongs to the field of new energy, and discloses a lithium ion anode material SiO2@SnO2 with a coated structure and a preparation method and application thereof. The anode material is a composite material consisting of SnO2 and SiO2. SnO2 is wrapped and dispersed on the surface of SiO2 so as to form the coated structure. According to the preparation method, the lithium ion anode material SiO2@SnO2 with the coated structure is prepared by using a one-step hydrothermal method. The preparation method is simple, and the compounded composite anode material SiO2@SnO2 has the characteristics of good cycle performance and so on.

Description

technical field [0001] The invention belongs to the field of new energy, in particular to a SiO 2 @SnO 2 Covered structure lithium ion negative electrode material and its preparation method and application. Background technique [0002] With the development of electronic products and electric vehicles, the market has a great demand for lithium-ion batteries with high capacity, high energy density, stable cycle performance and long life. In the development process of lithium-ion batteries, negative electrode materials are one of the keys to the development of lithium-ion batteries. Although traditional carbonaceous negative electrode materials have a long life and low cost, they have low specific capacity (theoretical capacity is 372mA h g -1 ), it is difficult to meet the needs of the market, which seriously restricts the development of lithium-ion batteries. Through research, tin-based materials can form alloys with lithium, have higher theoretical capacity, and are cons...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M10/0525Y02E60/10
Inventor 张海燕许兴发陈易明
Owner GUANGDONG UNIV OF TECH
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