Method for efficiently preparing graphene/metal oxide composite material

Abstract

The present invention provides a method for efficiently preparing a graphene / metal oxide composite material based on gamma irradiation. The method comprises the following steps: irradiating a mixed solution of graphene oxide and metal salts through gamma rays, and inducing oxygen-containing functional groups on the surface of graphene oxide to react with metal ions so as to synchronously achieve reduction of graphene oxide and oxidation of the metal ions and prepare the graphene / metal oxide composite material through one step. The method provided by the invention has beneficial effects as follows: the method is low in cost and simple in process, has high controllability, does not need to add high-risk reducing agents, is environment-friendly, and is beneficial for batch preparation of the material; under the oxidation-reduction action between rich oxygen-containing groups on the surface of graphene oxide and the metal ions, uniform dispersion and firm anchoring of metal oxide nano-particles on the surface of graphene can be effectively achieved, and uniform and stable material structures can be ensured; and additionally, as a cathode of a lithium battery, the material has relatively high theoretical specific capacity as well as excellent cycling performance and rate performance.

Description

technical field [0001] The invention belongs to the field of energy materials, in particular to a method for efficiently preparing graphene / metal oxide composite materials. Background technique [0002] With the urgent demand for high-performance lithium-ion batteries for electric vehicles, hybrid vehicles, and high-end energy storage systems, the development of anode materials with high capacity, high rate performance, and long cycle life has become the mainstream development direction in this field. Compared with commercial graphite-based anode materials, SnO 2 , Fe 2 o 3 , ZnO and other metal oxides have high theoretical lithium intercalation capacity, and have received great attention from domestic and foreign scholars in recent years. However, such materials will experience severe volume expansion during charging and discharging, resulting in large deformation stress, resulting in broken electrode materials, and ultimately resulting in continuous decline in battery c...

AI Technical Summary

Problems solved by technology

In the above preparation methods, the loading of metal oxides and the reduction of graphene oxide often need to be completed step by step, and the preparation process is cumbersome; during the reaction, the use of organic solvents, high-risk reducing agents or high-temperature heat treatment increases the energy consumption of the reaction and is not conducive to Environmental friendly