以不同锂盐与柠檬酸铁为原料,采用溶胶-凝胶法制备LiFePO4,并讨论在前躯体中加入表面活性剂对LiFePO4性能的影响.结合XRD、SEM和充放电测试等手段对材料性能进行表征.结果表明,表面活性剂可以抑制杂质相Li4P2O7的出现,得到颗粒尺寸较小的LiFePO4,在0.1C倍率下其首次放电比容量可达123.5mAh/g,循环10次后容量仅衰减2.4%.
LiFeO4 is synthesized by sol-gel method, using different lithium sources and iron (Ⅲ) citrate The influence of surfactant on the performances of LiFeO4 material is discussed. The samples are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical charge and discharge tests. These results showed that the LiFePO4 with fine particle size is obtained when surfactant is used, limiting the emergence of Li4 P2O7 as the impurity phase The first discharge capacity of 123. 5mAh/g under 0. 1C is obtained, with a decrease of only 2. 4% after10 cycles.
参考文献
| [1] | Panhi A K;Nanjundaswamy K S;Goodenough J B .Phospho-olivines as positive-electrode materials for rechargeable lithitLrn batteries[J].Journal of the Electrochemical Society,1997,144(04):1188. |
| [2] | Dominko R;Bele M;Gaberscek M et al.Porous olivine composites synthesized by sol-gel technique[J].Power Sources,2006,153:274. |
| [3] | Kim DH;Kim J .Synthesis of LiFePO4 nanoparticles and their electrochemical properties[J].The journal of physics and chemistry of solids,2007(5/6):734-737. |
| [4] | Kim C W;Park J S;Lee K S .Effect of Fe2P on the electron conductivity and electrochemical performance of LiFePO4 synthe-sized by mechaniccal alloying using Fe3+ raw material[J].Power Sources,2006,163:144. |
| [5] | C. Delacourt;P. Poizot;S. Levasseur .Size Effects on Carbon-Free LIFePO_4 Powders The Key to Superior Energy Density[J].Electrochemical and solid-state letters,2006(7):A352-A355. |
| [6] | Wang L;Huang Y D;Jiang R R et al.Preparation and characterization of nano-sized LiFePO4 by low heating solidstate coordination method and microwave heating[J].Electrochimica Acta,2007,52:6678. |
| [7] | Lim S Y;Yoon C S;Cho J .Synthesis of nanowire and hollow LiFePO4 cathodes for high-performance lithium batteries[J].Chemistry of Materials,2008,20:4560. |
| [8] | L.J. Fu;H. Liu;C. Li;Y.P. Wu;E. Rahm;R. Holze;H.Q. Wu .Electrode materials for lithium secondary batteries prepared by sol-gel methods[J].Progress in materials science,2005(7):881-928. |
| [9] | 惠乐,唐子龙,罗绍华,张中太.前驱体酸碱添加剂对溶胶凝胶法制备LiFePO4的影响[J].稀有金属材料与工程,2007(z1):121-123. |
| [10] | Daiwon Choi;Prashant N. Kumta .Surfactant based sol-gel approach to nanostructured LiFePO_4 for high rate Li-ion batteries[J].Journal of Power Sources,2007(2):1064-1069. |
| [11] | 梁风,戴永年,易惠华,熊学.纳米级锂离子电池正极材料LiFePO4[J].化学进展,2008(10):1606-1611. |
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