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碳热还原法合成正极材料Li_3V_2(PO_4)_3及其性能 被引量：6

Synthesis of cathode materials Li_3V_2(PO_4)_3 by carbon-thermal reduction procedure
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摘要 采用碳热还原(CTR)法以LiOH.H2O、V2O5和NH4H2PO4为原料合成了具有NASCION结构的锂离子蓄电池正极材料磷酸钒锂Li3V2(PO4)3。系统地研究了合成温度、反应时间和原料配比等因素对样品性能的影响。结果表明以n(Li)∶n(V)∶n(P)=3.05∶2.00∶3.00投入原料在800℃下煅烧24h合成的正极材料在0.1C充、放电制度下,首次充电比容量达到137mAh/g,首次放电比容量137mAh/g,充、放电效率达100%,经过20次循环后,放电容量仍然保留110mAh/g,为初始放电容量的84%。对样品进行了X射线衍射(XRD)分析,结果表明合成的样品Li3V2(PO4)3具有单斜晶体结构。 Cathode materials lithium-vanadium-phosphate Li3V2（PO4）3 were synthesized by carbon-thermal reduction method, with LiOH ·H2O、V2O5 and NH4H2PO4 as the raw materials, The effects of reaction conditions on the properties were studied systematically. The results showed that the sample synthesized from the raw materials with the molar ratio of n（Li） ： n（V） ： n（P） to 3.05 ： 2.00 ： 3,00 under 800 ℃ for 24 h had a monoclinic crystal structure, which derived a initial discharge specific capacity of 137 mAh/g. After charged/discharged at 0.1 C rate for 20 cycles, the sample retained a discharge specific capacity of 110 mAh/g.
作者 刘素琴 唐联兴 黄可龙
机构地区 中南大学化学化工学院
出处 《电源技术》 CAS CSCD 北大核心 2006年第6期473-476,共4页 Chinese Journal of Power Sources
基金 国家自然科学基金(20376086)
关键词 LI3V2(PO4)3 正极材料 NASCION结构 lithium vanadium phosphate cathode materials NASICON structure
分类号 TM912.9 [电气工程—电力电子与电力传动]
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参考文献14

  • 1MORGAN D,CEDER G, SAIDI M Y, et al. Experimental and computational study of the structure and electrochemical properties of monoclinic LixM2(PO4)3 compounds[J]. J Power Sources, 2003,119-121: 755-759.
  • 2SAIDI M Y, BARKER J, HUANG H, et al. Performance character istics of lithium vanadium phosphate as a cathode materials for lithium-ion batteries[J]. J Power Sources, 2003, 119-121: 266-272.
  • 3PADHI A K, MANIVANNAN V, GOODENOUGH J B. Tuning theposition of the redox couples in materials with NASICON structure by anionic subsitiution[J]. J Electrochem Soc, 1998, 145(5):1518-1520.
  • 4PADHI A K, NANJUNDASWAMY K S, MASQUELIER C, et al.Mapping of transition metal redox energies in phosphates with NASICON srtucture by lithium intercalation [J]. J Electrochem Soc,1997, 144:2 581-2 586.
  • 5MASQUELIER C, PADHI A K, NANJUNDASWAMY K S, et al.New cathode materials for rechargeable lithium batteries: The 3-Dframework structures Li3Fe2(XO4)3 [J]. J Solid State Chem, 1998,135:228-234.
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  • 7NANJUNDASWAMY K, PADHI A, GOODENOUGH J, et al.Synthesis, redox potential evaluation and electrochemical characteristic of NASICON-related-3D framework compounds [J]. Solid State lonics, 1996, 92: 1-10.
  • 8HUAN Huang, SHIEH C Y, TRACY K, et al. Nanostructured composites: A high capacity, fast rate li3v2(po4)/carbon cathode for rechargeable lithium batteries [J]. Adv Mater, 2002, 21:1 525-1 528.
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二级参考文献6

  • 1Yamada A, Chung S C, Hinokuma K. Optimized LiFePO4 for lithium battery cathodes [J ]. J Electrochem Soc, 2001, 148 ( 3 ) : A 224 -A 229.
  • 2Huang H, Yin S C, Naz I. F. Approaching theoretical capacity of LiFePO4 at room temperature at high rates[J ]. Electrochemical and Solid-State Letters. 2001,4(10): AI70 - A172.
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  • 4Croce F, D' Epifanio A, Hassoun J, et al. A novel concept for the synthesis of an improved LiFePO4 lithium battery cathode [J ].Electrochemical and Solid-State Letters, 2002, 5 (3) : A47 - AS0.
  • 5Li G, Azuma H, Tohda M. Optimized LiMnyFe1-yPO4 as the cathode for lithium batteries[J]. J Electrochem Soc, 2002, 149(6) : A 743 -A 747.
  • 6Padlhi A K, Nanjundaswamy K S, Goodenough J B. Phospho-olivines as positive-electrode materials for rechargeable lithium batteries[J]. J Electrochem Soc, 1997, 144(4):1 188- 1 194.

共引文献38

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引证文献6

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电源技术
2006年 第6期

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