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碳热还原法制备LiVPO₄F及其电化学性能

Synthesis of LiVPO₄F by carbothermal reduction method and its electrochemical properties

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【Author】 ZHONG Sheng-kui~(1,2),YIN Zhou-lan~1,WANG Zhi-xing~3,CHEN Qi-yuan~1(1.College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;2.Department of Material and Chemistry,Guilin University of Technology,Guilin 541004,China;3.School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China)

【机构】中南大学化学化工学院；中南大学冶金科学工程学院；中南大学化学化工学院湖南长沙410083；桂林工学院材料与化学系；广西桂林541004；湖南长沙410083；

【摘要】以LiF、V2O5和NH4H2PO4为原料,C为还原剂,采用碳热还原法两步合成了锂离子电池正极材料LiVPO4F。考察了不同合成温度、时间对产物晶形结构、形貌和电化学性能的影响。结果表明,当合成温度、时间分别为750℃、30min时,所合成的LiV-PO4F样品属于三斜晶系,且颗粒分布比较均匀。该材料以0.2C充放电,首次放电容量为119mAh/g,放电平台在4.2V左右(vs.Li/Li+),循环30次后其比容量达89mAh/g。更多还原

【Abstract】 The cathode material LiVPO₄F was prepared by a two-step carbothermal reduction reaction of LiF,V₂O₅ and NH₄H₂PO₄,with carbon as the reduction agent.The effect of reaction temperature and time on the structure,morphology and electrochemical properties was investigated.The results show that the sample synthesized at 750℃ for 30min has a single triclinic structure with homogenous distribution of particle,which delievered initial discharge capacity of 119mAh/g at 0.2C rate with an average discharge voltage of 4.2V（vs.Li/Li⁺）,and the capacity retains 89mAh/g after 30 cycles.更多还原