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

doi:10.3866/PKU.WHXB201501261

Abstract

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 ℃. 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 ℃ 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 ℃.

Key words: Lithium-ion battery, Cathode material, Sol-gel, Carbon thermal reduction, LiVPO₄F/C

HUANG Zhi-Peng, GUO Lin-Yu, GUO Chao, ZHAO Meng-Meng, WANG Xue-Hua, JIN Zhao, LUO Jin-Hua, WANG Xin, FENG Ji-Jun. Synthesis of Fluorinated Polyanionic Lithium Ion Insertion/Extraction Material LiVPO₄F/C by Carbon Thermal Reduction Assisted Sol-Gel Method[J]. Acta Phys. -Chim. Sin. 2015, 31(4), 700-706. doi: 10.3866/PKU.WHXB201501261

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Synthesis of Fluorinated Polyanionic Lithium Ion Insertion/Extraction Material LiVPO₄F/C by Carbon Thermal Reduction Assisted Sol-Gel Method

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Synthesis of Fluorinated Polyanionic Lithium Ion Insertion/Extraction Material LiVPO4F/C by Carbon Thermal Reduction Assisted Sol-Gel Method

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Synthesis of Fluorinated Polyanionic Lithium Ion Insertion/Extraction Material LiVPO₄F/C by Carbon Thermal Reduction Assisted Sol-Gel Method