Based On The Research Of Seaweed Biomass Phosphorous Carbon Composite Material In The Negative Electrode Of Lithium Ion Battery

As a kind of energy storage equipment,lithium ion batteries are widely used in hybrid electric vehicles,smart grid and portable electric vehicles.The traditional anode material graphite only has 372 m Ah g^-1 theoretical capacity and low energy density,which can not meet the requirements of high gravimetric and volume energy density.Development of more novel electrode materials,especially the anode materials is particularly important.Red phosphorus has high theoretical capacity of 2596 mAh g^-1,which are commercially available,stable and environmental friendly.However,as the anode materials for lithium ion batteries,red phosphorus suffers from poor conductivity and volume expansion,resulting in the rapid attenuation capacity.The compound of red phosphorus and porous carbon materials is the best solution,which can not only overcome the volume expansion,but also greatly improve the electrochemical conductivity.Renewable biomass materials are rich in reserves and environment-friendly.Obtaining a variety of forms of energy has become a hot research topic from biomass.Biomass materials,calcium alginate fibers and enteromorpha,have high surface area and pore volume after high temperature carbonization as carbon substrate.The composite between biomass carbon substrate and red phosphorus by vaporization-condensation method not only can effectively limit the red phosphorus adsorption and particle,buffer the volume expansion,but also greatly improve the electrochemical conductivity,shorten the transmission path of ions and electrons,increase the contact area of the electrolyte,improving the electrochemical properties and promoting the development of the energy storage.In this work,we use biomass materials calcium alginate fibers,enteromorpha and carrageenan as carbon source and compound with red phosphorus on the following aspects:?1?The biomass carbon substrate have high surface area and pore volume after carbonization from calcium alginate fiber,enteromorpha and carrageenan.?2?We confined red phosphorus nanoparticles into biomass carbon substrate forming phosphorus carbon complex by vaporization-condensation method,which was applied to the anode material and shows high performance in lithium ion battery.