以LiOH·H2O、(NH4)2HPO4、FeSO4·7H2O为原料,通过沉淀法制备锂离子电池正极材料LiFePO4前驱体,前躯体中混入2wt%的活性炭在550℃(2烧结6h得到橄榄石型的LiFePO4.研究了反应时间、烧结温度、烧结时间对合成LiFePO4的影响,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、热重-差热综合分析(TG-DTA)、红外光谱(FTIR)等手段对合成的LiFePO4的结构、形态、热化学性质和电化学性能进行了研究,结果表明化学沉淀法制备橄榄石型LiFePO4正极材料呈形貌规整的类球形颗粒,晶型发育完善,粒度分布均匀.LiFePO4样品在室温首次放电容量119.5mAb·g-1,8次循环后放电容量衰减低于2%.
参考文献
| [1] | 庄大高,赵新兵,谢健,涂健,朱铁军,曹高劭.Nb掺杂LiFePO4/C的一步固相合成及电化学性能[J].物理化学学报,2006(07):840-844. |
| [2] | Cheol Woo Kim;Moon Hee Lee;Woon Tae Jeong et al.Synthesis of olivine LiFePO4 cathode materials by mechanical alloying using iron (Ⅲ) raw material[J].Journal of Power Sources,2005,146(1-2):534-538. |
| [3] | 丁燕怀,苏光耀,高德淑,刘黎,王承位.溶胶-凝胶法合成正极材料LiFePO4[J].电池,2006(01):52-53. |
| [4] | F. Croce;A.D' Epifanio;J. Hassoun .A Novel Concept for the Synthesis of an Improved LiFePO_4 Lithium Battery Cathode[J].Electrochemical and solid-state letters,2002(3):A47-A50. |
| [5] | K.S.Park;T.K.Kang;S.B.Lee;G.Y.Kim;Y.J.Park;H.G.Kim .Synthesis of LiFePO_4 with fine particle by co-precipitation method[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2004(12):1803-1810. |
| [6] | Paraguassu W;Freire P T C et al.Phonon calculation on olivine-like LiMPO4 (M=Ni,Co,Fe) and Raman scattering of the iron-containing compound[J].Journal of Raman Spectroscopy,2005,36:213-220. |
| [7] | Prosini P P;Carewska M et al.Long-term cyclability of LiFePO4[J].Electrochimica Acta,2003,48:4205-4211. |
| [8] | Silvera Scaccia;Maria Carewska;Pawel Wisniewski;Pier Paolo Prosini .Morphological investigation of sub-micron FePO_4 and LiFePO_4 particles for rechargeable lithium batteries[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2003(7):1155-1163. |
| [9] | Lee J;Teja AS .Characteristics of lithium iron phosphate (LiFePO4)particles synthesized in subcritical and supercritical water[J].The Journal of Supercritical Fluids,2005(1):83-90. |
| [10] | Sylvain Franger;Frederic Le Cras;Carole Bourbon;Helene Rouault .Comparison between different LiFePO_4 synthesis routes and their influence on its physico-chemical properties[J].Journal of Power Sources,2003(119/121):252-257. |
| [11] | Myung S T;Komaba S;Hirosaki N et al.Emulsion drying synthesis of olivine LiFePO4/C composite and its electrochemical properties as lithium intercalation material[J].Electrochimica Acta,2004,49:4213-4222. |
| [12] | Paraguassu W;Freire P T C;Lemos V et al.Phonon calculation on olivine-like LiMPO4 (M=Ni,Co,Fe) and Raman scattering of the iron-containing compound[J].Journal of Raman Spectroscopy,2005,36:213-220. |
| [13] | Ait Salah A;Mauger A;Julien C M et al.Nano-size impurity phases in relation to the mode of preparation of LiFePO4[J].Materials Science and Engineering B:Solid State Materials for Advanced Technology,2006,129:232-244. |
| [14] | Nyquist R A;Kagel R.O.Infrared Spectra of Inorganic Compounds (3800-45cm-1)[M].New York:Academic Press,Inc,1997 |
| [15] | 白莹,吴锋,吴川.新型锂离子电池正极材料LiMPO4（M = Fe, Mn）的谱学和电化学研究[J].光散射学报,2003(04):231-236. |
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