Preparation method of graphene-base tin dioxide composite anode material for lithium ion batteries

Abstract

The invention relates to a preparation method of a graphene-base tin dioxide composite anode material for lithium ion batteries, which belongs to the technical fields of material science and electrochemistry. The method for preparing graphene-base tin dioxide comprises the following steps: 1. dispersing graphite oxide nanosheets in an ethanol C2H5OH solution; 2. adding a certain amount of template agent cetyl trimethyl ammonium bromide (CTAB) into the suspension, adding a certain amount of tin tetrachloride hydrate (SnCl4.5H2O) and sodium hydroxide (NaOH) while vigorously stirring, and continuing stirring for 30 minutes; 3. after stirring, transferring the suspension into a high pressure reaction kettle, reacting in a baking oven at 160 DEG C for 20 hours, and washing the reaction product with ethanol and deionized water many times; and 4. carrying out vacuum drying on the product at 60 DEG C for 8 hours to obtain the graphene-base tin dioxide composite material.

Description

technical field [0001] The invention relates to a one-step method for preparing graphene-based tin dioxide composite lithium-ion battery negative electrode materials, belonging to the fields of material science and electrochemical technology. Background technique [0002] Lithium-ion energy materials can provide energy guarantee for modern communication and information technology. At present, the graphitized carbon anode materials that have been commercially promoted and used are increasingly unable to meet the requirements of technological development due to their low lithium storage capacity (<372mAh / g). Therefore, higher storage capacity and cycle life requirements are put forward for lithium-ion energy materials. In recent years, new lithium-ion energy materials with high specific capacity and excellent cycle performance have become a hot spot of scientific research. [0003] In recent years, on the basis of traditional graphite carbon materials, some new and excell...

AI Technical Summary

Problems solved by technology

However, during the alloying / dealloying process of such anode materials with lithium, the metal matrix may undergo large changes in both structure and volume, and at the same time, the mechanical pressure associated with volume changes can cause its mechanical stability. Rapid decay, causing cracks and brittleness in the electrode, resulting in the loss of electrical contact between ions, and eventually leading to a rapid decline in its cycle performance

Therefore, high-capacity lithium alloy and metal oxide anode materials are still difficult to obtain practical applications.

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