A kind of graphene loaded transition metal silicate nano film material and preparation method thereof for lithium ion battery

Abstract

The invention discloses a graphene loaded transition metal silicate nano film material for a lithium ion battery and a preparation method of the nano film material. The nano film material is preparedfrom transition metal salt, a complexing agent, graphene and silicon tetrachloride in an organic alcohol phase system by a solvothermal method; a chemical formula of the nano film material is M2SiO4 / SiO2 / G; M is transition metal Mn, Fe, Co or Ni; and G is the graphene. The material is used in a lithium ion battery cathode; a two-dimensional nano film structure of the material facilitates transmission of charge in the material, and can effectively reduce volume expansion of the material in a lithium disembedding process; and high capacity and excellent cycle performance are represented.

Description

technical field [0001] The invention relates to a graphene-loaded transition metal silicate nano-membrane material, belonging to the field of negative electrode materials for lithium-ion batteries. Background technique [0002] Since the actual commercialization of lithium-ion batteries, lithium-ion batteries have been widely used in various fields and continue to develop due to their high energy density and environmental friendliness. At present, the anode material of commercial lithium-ion batteries is mainly graphite, and its theoretical capacity is 372mAh g -1 , low capacity gradually cannot meet the growing demand of people, so the development of new anode materials with high capacity becomes the key. [0003] Silicon dioxide has high theoretical capacity, abundant reserves, and low cost. It is an ideal substitute for the anode material of the next generation of lithium-ion batteries; The problem of volume expansion has become a major obstacle to its commercial applic...

AI Technical Summary

Problems solved by technology

At present, the anode material of commercial lithium-ion batteries is mainly graphite, and its theoretical capacity is 372mAh g -1 , the low capacity gradually cannot meet the growing demand of people, so the development of new anode materials with high capacity becomes the key

[0003] Silicon dioxide has high theoretical capacity, abundant reserves, and low cost. It is an ideal substitute for the anode material of the next generation of lithium-ion batteries; The volume expansion problem has become the main obstacle to its commercial application

[0006] Although the above-mentioned method for preparing transition metal silicate materials can prepare transition metal silicate in a pure phase, the preparation process has disadvantages such as high energy consumption, long time consumption, complicated process routes, etc., and its capacity as a lithium ion battery negative electrode material Generally, it is therefore necessary to propose a new material capable of possessing a high Li-ion capacity with a simple and convenient preparation process.

Images