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

2013 
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.
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