物理化学学报Issue(4)：700-706,7.DOI:10.3866/PKU.WHXB201501261
碳热还原辅助溶胶-凝胶法制备氟代聚阴离子型嵌/脱锂材料LiVPO4F/C
Synthesis of Fluorinated Polyanionic Lithium Ion Insertion/Extraction Material LiVPO4F/C by Carbon Thermal Reduction Assisted Sol-Gel Method
摘要
Abstract
LiVPO4F/C, as a cathode material of lithium-ion batteries, was prepared by carbon thermal reduction assisted sol-gel method. X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge cycles, cyclic voltammogram (CV), and electrochemical impedance spectroscopy (EIS) were employed to investigate the effects of sintering time and temperature on the structure and corresponding electrochemical performance of as prepared materials. At a sintering time of 4 h, pure phase LiVPO4F/C material was obtained when the temperature is settled at 450 ° C. The as-produced LiVPO4F/C exhibited discharge capacities of 193.2, 175.6, and 173.7 mAh∙g-1 at 0.1C, 0.5C, and 1.0C rates, respectively. Li3V2(PO4)3 impurities are formed and increased with increasing calcination temperature. When sintered at 650 °C Li3V2(PO4)3 is turn out to be the main phase. On the other hand, optimal duration time at high temperature could also inhibit the decomposition of LiVPO4F and decrease the formation of Li3V2(PO4)3 impurities, improving electrochemical performance. Optimal conditions were found at a residence time of 3 h when the precursor is sintered at 550 °C.关键词
锂离子电池/正极材料/溶胶-凝胶/碳热还原/LiVPO4F/CKey words
Lithium-ion battery/Cathode material/Sol-gel/Carbon thermal reduction/LiVPO4F/C分类
化学化工引用本文复制引用
黄志鹏,郭琳昱,郭超,赵盟盟,王雪华,金钊,罗晋花,王鑫,冯季军..碳热还原辅助溶胶-凝胶法制备氟代聚阴离子型嵌/脱锂材料LiVPO4F/C[J].物理化学学报,2015,(4):700-706,7.基金项目
The project was supported by the National Natural Science Foundation of China (51102114), Sci-Tech Development Project of Jinan, China (201401234), and National Undergraduate Training Programs for Innovation and Entrepreneurship, China (201310427010).国家自然科学基金(51102114),济南市科技发展计划(201401234)和国家级大学生创新创业训练计划(201310427010)资助项目 （51102114）
