A Coalescence Mechanism for the Composite Cathode Material xLiFePO(4)center dot yLi(3)V(2)(PO4)(3)

作者：Zheng Jun Chao; Li Xin Hai^*; Wang Zhi Xing; Li Jin Hui; Wu Ling; Li Ling Jun; Guo Hua Jun

来源：Acta Physico - Chimica Sinica, 2009, 25(9): 1916-1920.

DOI：10.3866/PKU.WHXB20090929

• Lithium ion battery
• Composite cathode material
• Doping
• xLiFePO(4)center dot yLi(3)V(2)(PO4)(3)

Composite cathode material xLiFePO(4)center dot yLi(3)V(2)(PO4)(3) was obtained from wet chemical reduction and lithiation method by using FePO4 center dot xH(2)O, 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 good lithium ions extraction/insertion property.

• 出版日期2009-9
• 单位江西理工大学; 中南大学