Preparation method of nano ferrous sulfide/graphene composite positive electrode material

Abstract

The invention discloses a preparation method of a nano ferrous sulfide / graphene composite positive electrode material. The ferrous sulfide / graphene composite material is prepared by using a ferroferric oxide / graphene composite material as a reaction product and introducing a sulfur source based on a chemical vapor deposition method. ferrous sulfide particles are uniformly dispersed on the surfaceof the graphene and are combined with the graphene stably, thereby preventing agglomeration of the nanoparticles during charging and discharging processes effectively, buffering the volume expansion,suppressing the dissolution of the reaction product in the electrolyte and thus guaranteeing the electrode structure stability during the charging and discharging processes. Meanwhile, the graphene provides a good conductive network to accelerate electron transport. Moreover, the preparation process is simple; the time is shortened; the cost is lowered; and the industrial production is easy to implement. The ferrous sulfide / graphene composite material prepared based on the method has the excellent electrochemical performance and is an ideal positive electrode material for a lithium ion battery. Therefore, the nano ferrous sulfide / graphene composite positive electrode material can be widely applied to portable electronic equipment, electric vehicles and aerospace and other fields.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, and in particular relates to a method for preparing a novel rechargeable and dischargeable lithium-ion battery nanometer ferrous sulfide / graphene (FeS / graphene) composite material. technical background [0002] In today's era, lithium-ion batteries are widely used in mobile phones, notebooks and other digital electronic products and hybrid electric vehicles due to their advantages such as high reversible capacity, high voltage, high cycle performance, high energy density, long cycle life, small self-discharge rate and no memory effect. and other fields have been widely used. With the rapid development of electronic digital products, the performance requirements of the batteries used are getting higher and higher, and there is an urgent need for lithium-ion batteries with high capacity and high energy density to meet the market demand. Today, the "bottleneck" that limits t...

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Problems solved by technology

Preparation of nanoscale pure ferrous sulfide materials, due to large volume changes and poor electronic conductivity during charge and discharge, and nanomaterials are easy to cause active ferrous sulfide to agglomerate during charge and discharge, its cycle stability and rate The performance needs to be further improved; the preparation of ferrous sulfide with special morphology mostly uses organic templates or organic surfactants, the preparation process is complicated, and the yield is low; the preparation of ferrous sulfide / C composites mostly uses solvothermal method and co-precipitation method, However, the controllability of the process of this kind of preparation method is poor, the cost is high, the energy consumption is large, and it is not easy to produce on a large scale.

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