应用碳包覆固相法合成锂离子电池Li3V2(PO4)3正极材料.X射线衍射、扫描电子显微镜表征材料的结构和观察表面形貌.材料的电阻和电化学性能测试表明,碳包覆Li3V2(PO4)3材料可避免颗粒团聚,减小颗粒尺寸,提高材料电导率,改善其电极的电化学性能.
The carbon coating Li3V2(PO4)3 powder samples were synthesized by carbon incorporation solid state reaction.The structure,morphology and electrochemical properties have been studied by X-ray powder diffraction,scanning electron microscopy and automatic battery tester system,respectively.Carbon coating on Li3V2(PO4)3 would prevent the particles from agglomerating,reduce the particle size,raise the conductivity and improve the samples′ electrochemical performance.
[1]Padhi A K,Najundaswamy K S,Goodenough J B.Phospho-olivines as positive-electrode materials for re-chargeable lithium batteries[J].Electrochem Soc,1997,144:1188.
[2]Okada S,Sawa S,Egashira M,et al.Cathode proper-ties of phospho-olivine LiMPO4for lithium secondarybatteries[J].J Power Sources,2001,(97~98):430.
[3]Delacourt C,Poizot P,Morcrette M,et al.One-steplow-temperature route for the preparation of electro-chemically active LiMnPO4powders[J].Chem Mater,2004,16:93.
[4]Saidi M Y,Barker J,Huang H,et al.Performancecharacteristics of lithium vanadium phosphate as a cath-ode material for lithium-ion batteries[J].J PowerSources,2003,(119~121):266.
[5]Huang H,Yin S C,Kerr T,et al.Nanostructrued com-positions:A high capacity,fast rate Li3V2(PO4)3/carbon cathode for rechargeable lithium batteries[J].Adv Mater,2002,14:1525.
[6]Li Y Z,Zhou Z,Ren MM,et al.Electrochemical per-formance of nacrystalline Li3V2(PO4)3/carbon com-posite material synthesized by a novel sol-gel method[J].Electrochim Acta,2006,51:6498.
[7]Barker J,Saidi M Y,Swoyer J L.A carbothermal re-duction method for the preparation of electroactive ma-terials for lithium ion applications[J].J ElectrochemSoc,2003,150:A684.
[8]Yamada A,Chung S C.Crystal chemistry of the olivine-type Li(MnyFe1-y)PO4 and(MnyFe1-y)PO4as possi-ble 4V cathode materials for lithium batteries[J].JElectrochem Soc,2001,148:A960.
