Effect of carbon content on electrochemical performance of LVP/C
Zhou Guojiang;Zhang Guangming;Zhang Weijun;School of Environmental & Chemical Engineering,Heilongjiang University of Science & Technology;Institute of Advanced Technology,Heilongjiang Academy of Sciences;
This paper is directed at improving the conductivity of LVP. The targeted research process involves synthesizing carbon-coated lithium vanadium phosphate( LVP/C) composite from citric acid as the carbon source using sol-gel method and investigating the effect of carbon content on the electrochemical performance in LVP/C through charge-discharge,CV,XRD and SEM. The results show that LVP/C fabricated by adding a mole ratio of 2. 0 to the carbon source exhibits the best electrochemical performance; when working at the voltage ranging from 3. 0-4. 3 V,and rate of 0. 5,C2. 0 material has the initial discharge specific capacity of up to 123 m Ah/g and,after 80 cycles,it exhibits the specific capacity retention rate of 99. 7%,relative to the first-cycle charge-discharge capacity,demonstrating the best reversible and lithium ion diffusion performance; and the samples boast the better crystalline properties: the crystalline grain size of about 1 μm and coated carbon thickness of about 3. 6 nm,as is validated by the characterization of structure and morphology.
【CateGory Index】： TM912