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Co2SnO4/C nano-composite negative electrode material for lithium ion battery, preparation and application of Co2SnO4/C nano-composite negative electrode material

A lithium-ion battery and nano-composite technology, applied in the field of electrochemistry, can solve the problems of impossibility for industrial application, long reaction time, and small output, and achieve good cycle stability and rate performance, high specific capacity, and improved conductivity. Effect

Active Publication Date: 2014-08-06
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the hydrothermal method also has the disadvantages of small output and long reaction time, so it cannot be applied industrially.

Method used

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  • Co2SnO4/C nano-composite negative electrode material for lithium ion battery, preparation and application of Co2SnO4/C nano-composite negative electrode material
  • Co2SnO4/C nano-composite negative electrode material for lithium ion battery, preparation and application of Co2SnO4/C nano-composite negative electrode material
  • Co2SnO4/C nano-composite negative electrode material for lithium ion battery, preparation and application of Co2SnO4/C nano-composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] To prepare the lithium-ion battery negative electrode sheet, the specific steps are as follows:

[0044] (1) Preparation of Li-ion battery Co 2 SnO 4 / C nanocomposite anode material:

[0045] (1) Dissolve 0.875g of tin chloride pentahydrate and 1.19g of cobalt chloride hexahydrate in 50mL of deionized water to obtain a dispersion, and then add it to the dispersion under stirring (100r / min) at a speed of 5mL / min Add 50 mL of sodium hydroxide solution dropwise to ensure that the concentration of NaOH in the solution after the dropwise addition is 2 mol / L. After the dropwise addition, continue to stir and react for 10 minutes, then centrifuge the reaction solution to take the precipitate, and dry the resulting precipitate in vacuum at 60°C for 12 hours to obtain a powder; wherein, the molar concentration of tin ions in the dispersion is 0.05mol / L, and the molar concentration of cobalt ions is 0.1mol / L, the molar ratio of tin ions to cobalt ions is 1:2;

[0046] (2) Put...

Embodiment 2

[0052] To prepare the lithium-ion battery negative electrode sheet, the specific steps are as follows:

[0053] (1) Preparation of Li-ion battery Co 2 SnO 4 / C nanocomposite anode material:

[0054] (1) Dissolve 0.875g of tin chloride pentahydrate and 1.19g of cobalt chloride hexahydrate in 50mL of deionized water to obtain a dispersion, and then add it to the dispersion under stirring (250r / min) at a speed of 10mL / min Add 50 mL of sodium hydroxide solution dropwise to ensure that the concentration of NaOH in the solution after the dropwise addition is 2 mol / L. After the dropwise addition, continue to stir and react for 10 minutes, then centrifuge the reaction solution to take the precipitate, and dry the precipitate in vacuum at 70°C for 10 hours to obtain a powder; wherein, the molar concentration of tin ions in the dispersion is 0.05mol / L, and the molar concentration of cobalt ions is 0.1 mol / L, the molar ratio of tin ions to cobalt ions is 1:2;

[0055] (2) Put the pow...

Embodiment 3

[0060] To prepare the lithium-ion battery negative electrode sheet, the specific steps are as follows:

[0061] (1) Preparation of Li-ion battery Co 2 SnO 4 / C nanocomposite anode material:

[0062] (1) Dissolve 0.875g of tin chloride pentahydrate and 1.19g of cobalt chloride hexahydrate in 50mL of deionized water to obtain a dispersion, and then add it to the dispersion under stirring (500r / min) at a speed of 15mL / min Add 50 mL of sodium hydroxide solution dropwise to ensure that the concentration of NaOH in the solution after the dropwise addition is 2 mol / L. After the dropwise addition, continue to stir and react for 10 minutes, then centrifuge the reaction solution to take the precipitate, and dry the precipitate in vacuum at 90°C for 8 hours to obtain a powder; wherein, the molar concentration of tin ions in the dispersion is 0.05mol / L, and the molar concentration of cobalt ions is 0.1 mol / L, the molar ratio of tin ions to cobalt ions is 1:2;

[0063] (2) Put the powd...

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Abstract

The invention discloses a Co2SnO4 / C nano-composite negative electrode material for a lithium ion battery, preparation and application of the Co2SnO4 / C nano-composite negative electrode material. The method comprises the steps of dissolving tin salt and cobalt salt into a dispersing agent to obtain dispersion liquid; dropwise adding sodium hydroxide solutions into the dispersion liquid under the stirring condition; reacting, filtering or centrifuging and drying in vacuum to obtain powder; spreading the powder under the inert gas environment, raising the temperature to 900 DEG C, and then reacting to obtain a reaction product; mechanically milling the reaction product and graphite in a period of time and carrying out nano-milling again; finally, centrifuging the obtained solution to obtain a precipitate; washing and drying to obtain the Co2SnO4 / C nano-composite negative electrode material for the lithium ion battery. According to the Co2SnO4 / C nano-composite negative electrode material for the lithium ion battery, by adopting a form of doping the material and amorphous carbon, the material has the advantages of high charging / discharging efficiency for the first time, high specific capacity and high cycling stability.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, in particular to a lithium ion battery Co 2 SnO 4 / C nanocomposite anode material and its preparation and application. Background technique [0002] Due to the advantages of high voltage, no memory effect, high energy density, and no pollution, lithium-ion batteries have been widely used in mobile devices such as mobile phones, digital cameras, and notebook computers. Due to the development of science and technology and the demand for energy, lithium-ion batteries have been gradually used in electric bicycles and hybrid electric vehicles in recent years. At present, carbon materials are mainly used as anode materials for commercial lithium-ion batteries, but carbon materials have a low specific capacity (372mAh g -1 ) limits its application in the direction of high-power power lithium batteries. In order to develop lithium battery negative electrode materials with higher energy densi...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/62
CPCH01M4/362H01M4/483H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 汝强安柏楠陈畅胡社军
Owner SOUTH CHINA NORMAL UNIVERSITY
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