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Method for preparing Si/Ag/C composite negative material based on silver mirror reaction principle

A negative electrode material and silver mirror reaction technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low conductivity and unfavorable battery rate performance, and achieve uniform distribution, good rate performance and excellent cycle performance.

Inactive Publication Date: 2014-01-29
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Silicon-carbon composite materials are usually prepared by mixing organic polymers and silicon powder and then sintering them under an inert atmosphere. However, the form of carbon cracked by organic polymers is mostly amorphous carbon, which has low electrical conductivity, which is not conducive to improving the performance of batteries. Rate performance

Method used

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  • Method for preparing Si/Ag/C composite negative material based on silver mirror reaction principle
  • Method for preparing Si/Ag/C composite negative material based on silver mirror reaction principle

Examples

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Effect test

Embodiment 1

[0025] like figure 1 As shown, the concentration of 5% silver nitrate solution is dropped into the concentration of 20% ammonia solution to form a concentration of 2% silver ammonia solution; silicon powder with a size of 20nm is n Si : n Ag =50:1 ratio into the silver ammonia solution, adjust the pH value of the solution to 8; then the concentration is 25% glucose solution with n 葡萄糖 : n Ag =1:1 ratio slowly drop into the above solution, at 100 o C under magnetic stirring until the precursor body is formed; the precursor body is put into a tube furnace with argon gas for sintering, and the heating rate is controlled to be 10 o C / min, sintering temperature is 725 o C. The sintering time is 3 hours; finally, the temperature is lowered by cooling with the furnace, and the Si / Ag / C composite negative electrode material can be obtained.

Embodiment 2

[0027] like figure 2 As shown, the concentration of 2% silver nitrate solution is dropped into the concentration of 32% ammonia solution to form a concentration of 5% silver ammonia solution; silicon powder with a size of 320nm is n Si : n Ag =62:1 ratio was added to the silver ammonia solution to adjust the pH value of the solution to 9.5; then the concentration was 38% glucose solution with n 葡萄糖 : n Ag =1.5:1 ratio slowly drop into the above solution, at 95 o C under magnetic stirring until the precursor body is formed; the precursor body is put into a tube furnace with argon gas for sintering, and the heating rate is controlled to be 20 o C / min, sintering temperature is 550 o C. The sintering time is 10 hours; finally, the temperature is lowered by cooling with the furnace, and the Si / Ag / C composite negative electrode material can be obtained.

Embodiment 3

[0029] Drop the concentration of 4% silver nitrate solution into the concentration of 10% ammonia solution to form a concentration of 11% silver ammonia solution; n Si : n Ag =80:1 ratio was added to the silver ammonia solution to adjust the pH value of the solution to 9; then the concentration was 45% of the glucose solution to n 葡萄糖 : n Ag =1.2:1 ratio slowly drop into the above solution, at 80 o C under magnetic stirring until the precursor body is formed; the precursor body is put into a tube furnace with argon gas for sintering, and the heating rate is controlled to be 15 o C / min, sintering temperature is 600 o C. The sintering time is 8 hours; finally, the temperature is lowered by cooling with the furnace, and the Si / Ag / C composite negative electrode material can be obtained.

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Abstract

The invention relates to a method for preparing a Si / Ag / C composite negative material based on the silver mirror reaction principle. The method is characterized by comprising the following concrete steps: a) dropwise adding a 2-5% silver nitrate solution into a 10-32% ammonium hydroxide solution to form a 2-11% Tollens reagent solution; b) adding silica powder in the Tollens reagent solution and adjusting the PH value of the solution to 8-9.5; c) slowly dropwise adding a glucose solution into the solution obtained in the step b) and performing magnetic stirring at the temperature of 80-100 DEG C until forming a precursor; and d) sintering the precursor in a tubular furnace into which argon gas or nitrogen gas are introduced. Glucose is cracked by means of controlling sintering temperature and sintering atmosphere so that glucose is carbonized into highly-crystallized carbon which serves as a buffer framework during charging and discharging process of silica powder, so that the safety and the rate capability of the negative material are enhanced.

Description

technical field [0001] The invention relates to a Si / Ag / C composite negative electrode material prepared based on the principle of glucose silver mirror reaction, in particular to a preparation method of a silicon-based negative electrode material for a lithium ion battery, which belongs to the technical field of new energy materials. Background technique [0002] Lithium-ion batteries, a device that relies on the repeated movement of lithium ions between positive and negative electrode materials for energy storage and conversion, have been widely used in many fields such as portable electronic devices since their commercialization. Battery materials are an important component that determines battery performance, especially positive and negative electrode materials, which affect factors such as energy, power, safety and cost of lithium-ion batteries. Cathode materials are the most critical and costly part of lithium-ion batteries. The anode materials for lithium-ion secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/1395
CPCY02E60/122H01M4/362Y02E60/10
Inventor 姜涛陈慧明张克金米新艳
Owner CHINA FIRST AUTOMOBILE
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