Citation: NG Qiang, WANG Hong, LIAO Xiao-Zhen, MA Wei, HE Yu-Shi, MA Zi-Feng. Electrochemical Performance of Vanadium Modified LiFe_0.5Mn_0.5PO₄/C Cathode Materials for Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2012, 28(01): 100-104. doi: 10.3866/PKU.WHXB201228100 shu

Electrochemical Performance of Vanadium Modified LiFe_0.5Mn_0.5PO₄/C Cathode Materials for Lithium-Ion Batteries

1.
Institute of Electrochemical and Energy Technology, Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Received Date: 20 July 2011
Available Online: 19 October 2011
Fund Project: 国家自然科学基金(21073120, 20773087, 21006063) (21073120, 20773087, 21006063)上海市科学技术委员会科技支撑项目(09DZ1203603, 10DZ1202702)资助项目 (09DZ1203603, 10DZ1202702)

Vanadium modified LiFe_0.5Mn_0.5PO₄/C cathode materials with a nominal composition of (1-x)LiFe_0.5Mn_0.5PO₄-xLi₃V₂(PO₄)₃/C (x=0, 0.1, 0.2, 0.25, 1) were prepared by a solid-state reaction using NH4VO3 as the vanadium source. The electrochemical performance of the LiFe_0.5Mn_0.5PO₄-based compounds improved upon vanadium modification. The 0.8LiFe_0.5Mn_0.5PO₄-0.2Li₃V₂(PO₄)₃/C (LFMP-LVP/C) sample exhibited the highest discharge capacity of 141 mAh·g^-1 at 0.1C rate. X-ray diffraction analyses revealed a dual phase of the LFMP-LVP/C composite with the coexistence of an olivine-type LiFe_0.5Mn_0.5PO₄/C phase and a NASICON-type Li₃V₂(PO₄)₃ phase. Energy dispersive X-ray spectroscopy (EDS) analysis indicates a uniform distribution of Fe, Mn, V, and P in the composite. The electronic conductivity of LFMP-LVP was found to be 2.7×10^-7 S·cm^-1, which is much higher than the value (1.9×10^-8 S·cm^-1) of LiFe_0.5Mn_0.5PO₄ and similar to the value (2.3 × 10^-7 S·cm^-1) of pure Li₃V₂(PO₄)₃. Vanadium modification remarkably reduced the electrode polarization of the LFMP-LVP/C cathode during the charge-discharge procedure. This suggests that vanadium modification is an effective method to improve the electrochemical performance of olivine-type cathode materials.
- Lithium-ion battery,
- LiFe_0.5Mn_0.5PO₄,
- Li₃V₂(PO₄)₃-modified,
- Cathode material
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Electrochemical Performance of Vanadium Modified LiFe0.5Mn0.5PO4/C Cathode Materials for Lithium-Ion Batteries

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通讯作者: 陈斌, bchen63@163.com

Electrochemical Performance of Vanadium Modified LiFe_0.5Mn_0.5PO₄/C Cathode Materials for Lithium-Ion Batteries