以偏硅酸锂、草酸亚铁为原料，通过机械球磨-固相烧结法制得了Li2FeSiO4/C正极材料. 用X射线衍射（XRD）和扫描电子显微镜（SEM）表征观察材料的结构和形貌.恒流充放电测试电极电化学性能. 结果表明，30 oC下，1.5 V ～ 4.8 V电位范围，于10 mAg-1电流密度恒流充放电测试，Li2FeSiO4/C电极首次放电容量达167 mAhg-1，有良好的电化学性能.
Li2FeSiO4/C cathode material was synthesized using Li2SiO3 and FeC2O4 as raw materials by solid state method. The structure and morphology of the material were characterized by XRD and SEM. The electrochemical properties of the material were studied by constant-current cyclic testing. The results show that Li2FeSiO4/C has a good electrochemical performance. The first discharge capacity of Li2FeSiO4/C cathode material at 30oC reached 167 mAhg-1 when cycled at 10 mAg-1 between 1.5 and 4.8 V.
[1] Padhi A K, Nanjundaswamy K S, Goodenough J B. Phospho-olivines as positive-electrode materials for rechargeable lithium batteries[J]. Journal of Electrochemical Society, 1997, 144(4): 1188-1194.
[2] Nyten A, Abouimrane A, Armand M. Electrochemical performance of Li2FeSiO4 as a new Li-battery cathode material[J]. Electrochemistry Communications, 2005, 7(2): 156-160.
[3] Arroyo-de Dompablo M E, Armand M, Tarascon J M. On-demand design of polyoxianionic cathode materials based on electronegativity correlations: An exploration of the Li2MSiO4 system (M = Fe, Mn, Co, Ni)[J]. Electrochemistry Communications, 2006, 8(8): 1292-1298.
[4] Dominko R, Bele M, Gaberscek M. Structure and electrochemical performance of Li2MnSiO4 and Li2FeSiO4 as potential Li-battery cathode materials[J]. Electrochemistry Communications, 2006, 8(2): 217-222.
[5] Armand M, Michot C, Ravet N, et al. Lithium insertion electrode material based on orthosilicate derives: US, 6085015[P]. 2000-07-04.
[6] Zaghib K, Salah A A, Ravet N, et al. Structure, magnetic and electrochemical properties of lithium iron orthosilicate[J]. Journal of Power Sources, 2006, 160(2): 1381-1386.
[7] Kam K C, Gustafsson T, Thomas J O. Synthesis and electrochemical properties of nanostructured Li2FeSiO4/C cathode material for Li-ion batteries[J]. Solid State Ionics, 2011, 192(S1): 356-359.
[8] Guo H J, Xiang K X, Cao X, et al. Preparation and characteristics of Li2FeSiO4/C composite for cathode of lithium ion batteries[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(1): 166-169.
[9] Nyten A, Kamali S, Gustafsson T, et al. The lithium extraction/insertion mechanism in Li2FeSiO4[J]. Journal of Materials Chemistry, 2006, 16(23): 2266-2272.
[10] Dominko R. Li2MSiO4 (M = Fe and/ or Mn) cathode materials[J]. Journal of Power Sources, 2008, 184(2): 462-468.
[11] Gong Z L, Li Y X, He G N, et al. Nanostructured Li2FeSiO4 electrode material synthesized through hydrothermal-assisted sol-gel process[J]. Electrochemical and Solid-State Letters, 2008, 11(5): A60-A63.
[12] Deng C, Zhang S, Fu B L, et al. Characterization of Li2MnSiO4 and Li2FeSiO4 cathode materials synthesized via a citric acid assisted sol-gel method[J]. Materials Chemistry and Physics, 2010, 120(1): 14-17.
[13] Lv D P, Wen W, Yang Y, et al. A novel Li2FeSiO4/C composite: Synthesis, characterization and high storage capacity[J]. Journal of Materials Chemistry, 2011, 21(26): 9506-9512.
[14] Dominko R, Conte D E, Hanzel D, et al. Impact of synthesis conditions on the structure and performance of Li2FeSiO4[J]. Journal of Power Sources, 2008, 178(2): 842-847.
[15] Yabuuchi N, Yamakawa Y, Yoshii K, et al. Hydrothermal synthesis and characterization of Li2FeSiO4 as positive electrode materials for Li-ion batteries[J]. Electrochemistry, 2010, 78(5): 363-366.
[16] Peng Z D, Cao Y B, Hu G R, et al. Microwave synthesis of Li2FeSiO4 cathode materials for lithium-ion batteries[J]. Chinese Chemical Letters, 2009, 20(8): 1000-1004.
