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Citation: ZHENG Jun-Chao, LI Xin-Hai, WANG Zhi-Xing, LI Jin-Hui, WU Ling, LI Ling-Jun, GUO Hua-Jun. A Coalescence Mechanism for the Composite Cathode Material xLiFePO₄·yLi₃V₂(PO₄)₃[J]. Acta Physico-Chimica Sinica, ;2009, 25(09): 1916-1920. doi: 10.3866/PKU.WHXB20090929 shu

A Coalescence Mechanism for the Composite Cathode Material xLiFePO₄·yLi₃V₂(PO₄)₃

1.
School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 17 April 2009
Available Online: 7 August 2009

Composite cathode material xLiFePO4·yLi3V2(PO4)3 was obtained from wet chemical reduction and lithiation method by using FePO4·xH2O, V2O5, NH4H2PO4, Li2CO3 as raw materials and oxalic acid as reductant. X-ray diffraction (XRD) results showed that the composite material contained olivine LiFePO4 and monoclinic Li3V2(PO4)3 phases. High resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectrometry (EDAX) results indicated that some LiFePO4 and Li3V2(PO4)3 in the composite material were doped by V and Fe, respectively, and formed a solid solution. The valences of Fe and V doping in Li3V2(PO4)3 and LiFePO4 are +2 and +3, respectively. Charge and discharge tests showed that the synthesized composite material exhibited better electrochemical performance than individual LiFePO4 and Li3V2(PO4)3. Cyclic voltammetry indicated the composite material showing od lithium ions extraction/insertion property.
- Lithium ion battery,
- Composite cathode material,
- Doping,
- xLiFePO4·yLi3V2(PO4)3
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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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A Coalescence Mechanism for the Composite Cathode Material xLiFePO4·yLi3V2(PO4)3

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通讯作者: 陈斌, bchen63@163.com

A Coalescence Mechanism for the Composite Cathode Material xLiFePO₄·yLi₃V₂(PO₄)₃