Hydrothermal Synthesis and Electrochemical Characteristics of Cathode Materials Li3V2(PO4)(3)/C

作者：Wang Huan Feng; Gao Yan Ying; Jiang Qian Qian; Ma Cong; Wang Xing Yao^*

来源：Chemical Journal of Chinese Universities, 2012, 33(10): 2326-2332.

DOI：10.7503/cjcu20120011

• Li3V2(PO4)(3)/C
• Cathode material
• Hydrothermal method
• Electrochemical property

A novel hydrothermal method was used to synthesize carbon-coated lithium vanadium phosphate compound. LiOH center dot H2O, NH4VO3, NH4H2PO4 and maltose without further purification were selected as starting materials to prepare precursor and the Li3V2(PO4)(3)/C which was obtained by sintering precursor at 650 degrees C for 2 h in flowing argon, and the effects of carbon content on electrochemical properties were investigated. The structural, morphology and electrochemical properties were investigated via X-ray diffraction(XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and constant current charge-discharge cycling. The compound synthesized at 650 degrees C took on pure monoclinic crystal structure, the particle size of the samples were ranged from 100 nm to 300 nm and there was a layer of carbon on the surface of Li3V2(PO4)(3)/C particles, which was available for enhancing the conductivity of Li3V2(PO4)(3). Electrochemical properties of Li3V2(PO4)(3)/C were investigated. The results show that the Li3V2(PO4)(3)/C synthesized at 650 degrees C exhibits the highest initial discharge capacity of 118. 8 mA.h/g and at the 15th cycle, the sample still keeps 115. 1 mA.h/g at 1. 0C in the voltage range of 3. 0-4. 3 V with 10. 23% carbon contents. This behavior indicates that the Li3V2(PO4)(3)/C material obtained by hydrothermal method has excellent capacity retention and rate capability.

• 出版日期2012-10-10
• 单位天津大学