Anode material

Abstract

The invention relates to an anode material which comprises graphene conductive films and silicon conductive films which are plated on the surface of a metal electrode, wherein the layer numbers of thegraphene conductive films and the silicon conductive films are both greater than or equal to 2; and the graphene conductive films and the silicon conductive films are arranged in an alternative overlapping manner. The graphene / silicon multi-layer film composite anode material provided by the invention has small volume change in charge and discharge, and is long in service life.

Description

technical field [0001] The invention belongs to the field of battery anode materials, in particular to a graphene / silicon composite anode material. Background technique [0002] In daily life, consumer electronic products play an indispensable role, and with the rapid increase in the use of wireless devices in recent years, energy storage materials that can provide stable power are issues that cannot be ignored. Among them, high-capacity Lithium ion batteries (LIBs for short) are the focus of development. However, currently commercial lithium-ion batteries mostly use graphite or silicon as the anode, but the theoretical capacitance of graphite is only 374mAh / g, which limits the electrochemical characteristics of the battery; although the theoretical capacitance of silicon can be However, its volume will change drastically during charging and discharging, which will easily cause electrode structure damage and greatly reduce its capacitance. [0003] In 2012, Ji et al. (Nano...

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Problems solved by technology

[0004] The present invention aims to provide a novel graphene / silicon multilayer composite anode material capable of solving the problems of large volume change and short service life of the graphene / silicon multilayer composite anode material in the prior art

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