Preparation And Electrochemical Performance Of Biomass Silicon Carbon Anode Materials

As an energy storage device,lithium-ion batteries have been largely used in mobile devices such as mobile phones and notebook computers,and are also widely used in electric vehicles.Because of its high energy density,long cycle life,fast charge and discharge,and other advantages have been largely concerned.However,the negative electrode materials for commercial lithium ion batteries are mostly graphite-based anode materials.Its theoretical specific capacity is 372 mAh g-1which limits the development of higher energy density lithium-ion batteries.Silicon-carbon composite anode materials have better performance than traditional graphite anode lithium-ion batteries,so the use of silicon-carbon as composite anode materials has attracted more and more attention.Biomass such as rice husks is a class of biomass-containing raw materials containing silicon,which is inexpensive and readily available.The use of organic carbon and silicon in biomass rice husks to prepare a silicon-carbon composite anode material for synthesizing lithium ion batteries can realize low-cost production of silicon-carbon composite anode materials for next-generation lithium ion batteries.The rice husk biomass was used as raw material,mixed with metal chloride,and a porous micro-structured C/SiO2 composite was prepared by carbonization to study its electrochemical performance.The results show that the electrode material prepared by the preparation has a specific capacity of 552 mAh g-1 after 100 cycles of charge/discharge at a current density of 0.2 A g-1,and has excellent electrochemical performance.The rice husk biomass was selected as the raw material,mixed with the lithium metal sheet,and the Li2CO3@C/SiO2 composite was prepared by carbonization to study its electrochemical performance.The results show that the electrode material prepared by the preparation has a specific capacity of 702 mAh g-1 after 100 cycles of charge/discharge at a current density of 0.2 A g-1,and has excellent electrochemical performance.The rice husk biomass was used as the raw material,and mixed with lithium hydroxide.A porous micro structured Li2CO3@C/SiO2 composite was prepared by carbonization to study its electrochemical performance.The results show that the electrode material prepared by the preparation has a specific capacity of 848 mAh g-1 after 100 cycles of charge/discharge at a current density of 0.2 A g-1,and has excellent electrochemical performance.Several silicon-containing biomass lithium-ion battery silicon-carbon composite anode materials were prepared by carbonization through rice husk as a carbon source and silicon source.The specific capacity of these materials exceeds the theoretical specific capacity of the graphite material.The production cost is small,the process flow is simple,and it is convenient for mass production.It has guided significance in the application of biomass silicon based anode materials in lithium ion batteries.