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Citation: BIAN Xiaofei, LIU Wanqiang, WEI Yingjin. Surfacial/Interfacial Behavior of Carbon Coated Li₃V₂(PO₄)₃ Cathode Material in LiPF₆ Based Electrolyte[J]. Chinese Journal of Applied Chemistry, ;2013, 30(5): 602-607. doi: 10.3724/SP.J.1095.2013.20295 shu

Surfacial/Interfacial Behavior of Carbon Coated Li₃V₂(PO₄)₃ Cathode Material in LiPF₆ Based Electrolyte

a. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China;
b. College of Physics, Jilin University, Changchun 130012, China

Received Date: 5 July 2012
Revised Date: 16 July 2012

Carbon coated monoclinic Li₃V₂(PO₄)₃ cathode material was prepared by the carbothermal reduction method. X-ray diffraction result showed that the material is phase pure monoclinic Li₃V₂(PO₄)₃ with space group of P2₁/n. HRTEM revealed a surfacial carbon layer with thickness about 5~10 nm. The material showed a reversible discharge capacity of 120 mA·h/g(C/4 rate),115 mA·h/g(1C rate) and 110 mA·h/g(2C rate) in the voltage window of 3.0~4.3 V,which maintained excellent cycle stability after 300 cycles. The material suffered from a capacity loss in the initial charge-discharge cycles. The irreversible capacity loss was mainly due to the progressive formation of a solid electrolyte interface(SEI) that could be observed under HRTEM. FTIR analysis showed that the chemical species of the SEI film mainly contained some organic compounds such as ROCO₂Li,RCO₂Li,and aliphatic,as well as some inorganic compounds such as Li₂CO₃,Li_xPF_y or Li_xPO_yF_z.
- Li-ion batteries,
- cathode material,
- Li₃V₂(PO₄)₃,
- surfacial/interfacial reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

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Surfacial/Interfacial Behavior of Carbon Coated Li₃V₂(PO₄)₃ Cathode Material in LiPF₆ Based Electrolyte