Progress on LiVPO4F as a cathode material for lithium-ion batteries
Tavorite type cathode material lithium vanadium fluorophosphate(LiVPO4F)has the advantages of high safety performance,high specific energy,high operating voltage,low cost and environmental friendli-ness.The material has a three-dimensional channel structure,which makes more diffusion paths for lithium ions and faster diffusion rate.The modified LiVPO4F material can meet the future demand for fast charging and discharging of power batteries.Compared with lithium iron phosphate(LiFePO4),it has a higher theoretical specific capacity and better safety performance,the future is expected to become an important cathode materi-al in commercial lithium-ion batteries.We reviewed and discussed various methods of synthesis of LiVPO4F materials in recent years and compared their advantages and disadvantages.The polymer template method,hy-drothermal method and sol-gel method were found to be able to synthesize LiVPO4F materials with higher crys-tallinity,which resulted in faster electron migration rate and better multiplicity performance.However,these three methods are unable to mass produce LiVPO4F materials.While the high solid-phase method is simple to operate and can synthesize LiVPO4F materials in bulk,this method makes the material morphology inhomoge-neous and affects its electrical conductivity.The modification of carbon coating and ion doping can improve the performance of LiVPO4F materials.
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