以铁粉为铁源,采用硫酸循环辅助法制备锂离子电池正极材料 LiFePO4的前驱体 FePO4。实验结果表明,采用过量硫酸可以促使铁粉与磷酸的完全反应,并且可以在反应体系中循环使用,整个反应体系没有任何废液产生。XRD 和 SEM分析表明,首次合成的FePO4与循环30次后得到的 FePO4其结构、形貌和大小相同。采用不同循环次数合成的 FePO4与计量比的LiOH 和适量蔗糖混合,在5% H2~95% N2气氛中在350℃烧结5h,700℃烧结15h,得到的目标产物LiFePO4/C一致性好,电性能优异,0.2、0.5、1和5C放电容量分别为155.1、144.0、134.4和101.7mAh/g,并且具有优异的倍率和循环性能。
In this essay,based on iron powder for iron source,the precursor of LiFePO4 which is the cathode material of lithium ion battery were synthesized by sulfuric acid assisted circulation.The results showed that the excess sulfuric acid could make the reaction of iron powder and phosphate thorough,and it could be used circularly in the system,then the whole system did not produce any waste stream.The results of XRD and SEM indicated that the structure,morphology and size of FePO4 which were composed in the first time or cycle 30 times were the same.The LiFePO4/C composite cathode material was synthesized using self-regulating Fe-PO4 under different cycle times as a precursor,glucose as a C source,and LiOH as a Li source,in a pipe fur-nace under an atmosphere of 5% H2-95% N2 ,followed by sintering in a pipe furnace at 350℃ for 5h,then at 750℃ for 15h.LiFePO4/C displays good consistency and showed excellent electrical performance:at a rate of 0.2,0.5,1,5C ,the discharge capacities were 155.1,144.0,134.4 and 101.7mAh/g,in addition,ouned out-standing ratio and cycle performance.
参考文献
| [1] | Haowen Liu;Hanmin Yang;Jinlin Li .A novel method for preparing LiFePO_4 nanorods as a cathode material for lithium-ion power batteries[J].Electrochimica Acta,2010(5):1626-1629. |
| [2] | 常照荣,吕豪杰,汤宏伟,付小宁.高密度LiFePO4/C正极材料的合成其及电化学性能研究[J].功能材料,2009(04):618-620. |
| [3] | 常照荣,吕豪杰,汤宏伟,付小宁,李华吉.Cu2+掺杂高密度LiFePO4/C正极材料的合成及性能[J].功能材料,2009(10):1682-1684. |
| [4] | K.L. Ng;Nian Zhan;C.W. Kok;M.C. Poon;Hei Wong .Electrical characterization of the hafnium oxide prepared by direct sputtering of Hf in oxygen with rapid thermal annealing[J].Microelectronics and reliability,2003(8):1289-1293. |
| [5] | M.-Y. Ho;H. Gong;G. D. Wilk;B. W. Busch;M. L. Green;P. M. Voyles;D. A. Muller;M. Bude;W. H. Lin;A. See;M. E. Loomans;S. K. Lahiri;Petri I. Raisanen .Morphology and crystallization kinetics in HfO_(2) thin films grown by atomic layer deposition[J].Journal of Applied Physics,2003(3):1477-1481. |
| [6] | E.P. Gusev;C. Cabral Jr.;M. Copel;C. D'Emic;M. Gribelyuk .Ultrathin HfO_2 films grown on silicon by atomic layer deposition for advanced gate dielectrics applications[J].Microelectronic engineering,2003(2/4):145-151. |
| [7] | Mori T.;Fujiwara M.;Manory RR.;Shimizu I.;Tanaka T.;Miyake S. .HfO2 thin films prepared by ion beam assisted deposition[J].Surface & Coatings Technology,2003(0):528-531. |
| [8] | Barker J;Saidi M Y;Swoyer J L .Lithium iron (Ⅱ) phospho-olivines prepared by a novel carbothermal reduc-tion method[J].Electrochemical and Solid State Letters,2003,6(03):A53-A55. |
| [9] | C.H. Mi;G.S. Cao;X.B. Zhao .Low-cost, one-step process for synthesis of carbon-coated LiFePO_4 cathode[J].Materials Letters,2005(1):127-130. |
| [10] | Allen, JL;Jow, TR;Wolfenstine, J .Analysis of the FePO4 to LiFePO4 phase transition[J].Journal of Solid State Electrochemistry,2008(7/8):1031-1033. |
| [11] | Padhi AK.;Goodenough JB.;Nanjundaswamy KS. .PHOSPHO-OLIVINES AS POSITIVE-ELECTRODE MATERIALS FOR RECHARGEABLE LITHIUM BATTERIES[J].Journal of the Electrochemical Society,1997(4):1188-1194. |
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