Pre-lithiated and graphene-coated mesoporous SiO negative electrode material and preparation method thereof

Abstract

The invention discloses a pre-lithiated and graphene-coated mesoporous SiO negative electrode material and a preparation method thereof. The method comprises the following steps: firstly, adding metal lithium to a non-aqueous solvent to form a lithium solution; secondly, adding graphene oxide to a dispersing solvent and carrying out ultrasonic treatment to obtain 0.5-60g / L of graphene oxide dispersion; adding nano mesoporous SiO microspheres with the specific surface area of 500-700m<2> / g to the dispersion, and carrying out ultrasonic treatment; adding the lithium solution under a stirring condition; adding a lithium complexing agent, stirring, filtering and washing to obtain a precursor; and finally drying the precursor in vacuum, grinding evenly, packing into a corundum boat, sintering in an inert atmosphere furnace, and cooling along with the furnace, so as to obtain the pre-lithiated and graphene-coated mesoporous SiO negative electrode material. The composite material is prelithiated in the process of preparing the graphene-coated mesoporous SiO negative electrode material; and the initial Coulomb efficiency, the cycle performance and the charge and discharge specific capacity of a silicon oxide negative electrode material are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials and preparation methods thereof, and relates to a pre-lithiated and graphene-coated mesoporous SiO negative electrode material and a preparation method thereof. Background technique [0002] With the development of science and technology, electronic devices are more miniaturized and lighter, and the use of portable electronic devices is becoming more and more extensive, which makes the development of lithium-ion batteries with higher capacity a focus. Positive and negative electrode materials are the key factors that determine the energy storage, service life, cost and price of lithium-ion batteries. However, since the commercialization of lithium-ion batteries, positive electrode materials have been continuously introduced, while negative electrode materials have been using carbon-based materials. However, the capacity of carbon-based materials is low, which can no longer meet the dev...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the poor conductivity of SiO and a large amount of Li in the first charging and discharging process + Due to consumption and other reasons, the problems of low capacity, first charge and discharge efficiency and poor cycle performance are caused. A pre-lithiated and graphene-coated mesoporous SiO negative electrode material and its preparation method are provided.