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Preparation method of three-dimensional nano porous tin-base alloy for lithium-ion battery negative electrode

A lithium-ion battery, three-dimensional nano technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that limit the commercial application of tin-based alloys, and achieve the effect of simple preparation method and environmental friendliness

Active Publication Date: 2015-06-24
SUZHOU YOULION BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of 3D nanoporous Sn-based alloys still faces great challenges, which limits the commercial application of Sn-based alloys.

Method used

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  • Preparation method of three-dimensional nano porous tin-base alloy for lithium-ion battery negative electrode
  • Preparation method of three-dimensional nano porous tin-base alloy for lithium-ion battery negative electrode
  • Preparation method of three-dimensional nano porous tin-base alloy for lithium-ion battery negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) At 25°C, mix and react 0.6 mol / liter aqueous solution of nickel potassium cyanide and 0.6 mol / liter aqueous solution of tin tetrachloride to form a tin-nickel cyanide rubber system, in which potassium nickel cyanide and tin tetrachloride The molar ratio is 0.5:1.

[0025] (2) Take the tin-nickel cyanide rubber system obtained in step (1) as a precursor, add excessive reducing agent sodium borohydride therein, leave it to stand for 1 hour to fully react the tin-nickel cyanide rubber and the reducing agent, wash the product, and then Dry under vacuum to obtain a three-dimensional nanoporous tin-nickel alloy.

[0026] figure 1 , figure 2 , image 3 with Figure 4 They are the scanning electron micrographs, transmission electron micrographs, energy spectra and electrochemical performance diagrams of the three-dimensional nanoporous tin-nickel alloy synthesized in this example, respectively.

[0027] image 3 is the energy spectrum of the three-dimensional nanopor...

Embodiment 2

[0029] (1) At 0°C, mix and react 1 mol / liter aqueous solution of nickel potassium cyanide and 1 mol / liter aqueous solution of tin tetrachloride to form a tin-nickel cyanide rubber system, in which nickel potassium cyanide and tin tetrachloride The molar ratio is 1:1.

[0030] (2) Take the tin-nickel cyanide rubber system obtained in step (1) as a precursor, add an equivalent amount of reducing agent hydrazine hydrate to it, let stand for 0.1 hour to fully react the tin-nickel cyanide rubber and the reducing agent, wash the product, and then The three-dimensional nanoporous tin-nickel alloy is obtained by drying under the protection of an inert gas. The result is similar to Example 1.

Embodiment 3

[0032] (1) At 25°C, mix 0.1 mol / liter aqueous solution of nickel potassium cyanide with 0.1 mol / liter aqueous solution of tin tetrachloride to form a tin-nickel cyanide rubber system, in which potassium nickel cyanide and tin tetrachloride The molar ratio is 0.1:1.

[0033] (2) take the tin-nickel cyanide rubber system obtained in step (1) as a precursor, add excessive reducing agent sodium hypophosphite therein, leave standstill for 5 hours to make the tin-nickel cyanide rubber and reducing agent fully react, the product is washed, Subsequent drying under vacuum yielded a three-dimensional nanoporous tin-nickel alloy. The result is similar to Example 1.

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Abstract

The invention relates to a preparation method of three-dimensional nano porous tin-base alloy for a lithium-ion battery negative electrode. Within the temperature range between 0 and 100 DEG C, a transitional metal cyanide aqueous solution in given concentration is mixed and reacted with a stannic chloride aqueous solution in given concentration to form a tin-base cyanogen gel system according to certain molar ratio. The tin-base cyanogen gel system is used as a precursor, a reducing agent in identical volume or excessive volume is added into the precursor to stand for 0.1 to 20 hours, the tin-base cyanogen gel is adequately reacted with the reducing agent, and a product is washed and dried under the protection of vacuum or inert gas to obtain the three-dimensional nano porous tin-base alloy. The three-dimensional nano porous tin-base alloy prepared by adopting the tin-base cyanogen gel system as the precursor is used as the lithium-ion battery negative electrode material, the tin-base alloy has a three-dimensional nano porous structure, and when being used as the lithium-ion battery negative electrode material, the tin-base alloy has good cycling performance, high specific capacity and multiplying power performance. The preparation method is simple and environment-friendly, and the mass production can be realized.

Description

technical field [0001] The present invention relates to a preparation method of a tin-based alloy, in particular to a preparation method of a three-dimensional nanoporous tin-based alloy for negative electrodes of lithium-ion batteries. The tin-based alloy negative electrode material has good lithium storage performance, such as good cycle performance , High specific capacity and rate performance. Background technique [0002] At present, the world is facing two severe challenges of energy crisis and environmental pollution. With the rapid development of the global economy, the total amount of fossil fuels such as coal, natural gas and oil is continuously decreasing, and the environmental pollution and other problems caused by this are becoming more and more serious. Nowadays, countries are focusing on the development and utilization of green and low-energy energy. Due to the advantages of high energy conversion efficiency and low environmental pollution, fuel cells will be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C13/00H01M4/38
CPCY02E60/10
Inventor 唐亚文吴平李建苹陈煜周益明陆天虹
Owner SUZHOU YOULION BATTERY INC
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