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本文采用固相法制备了纯相LiMn1-xFexPO4/C (x=0.2,0.4,0.6)正极材料,并用X射线衍射(XRD)和扫描电镜(SEM)进行表征,用高精度电池测试系统进行充放电和循环伏安测试.结果表明不同Mn和Fe原子比的电极材料具有很大的性能差异,其中当x=0.4时,材料具有优异的循环稳定性和较高的可逆容量.首次充电容量和放电容量分别达到141.5 mAh/g和125.7 mAh
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关键词:
- 锂离子电池 /
- 固相法 /
- LiMn1-xFexPO4 /
- 正极材料
In this study, a series of phase-pure LiMn1-xFexPO4/C (x=0.2, 0.4, 0.6) cathode materials were successfully synthesized by solid-state method. The structure, particle size, surface morphology and electrochemical properties of these cathode active materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical model cell and cyclic voltammograms (CV). The results indicated that the different atom ratio of Mn/Fe affected its electrochemical preformance. A lithium battery using LiMn0.6Fe0.4PO4 as the active materials of the positive electrode exhibits a high initial charge capacity and discharge capacity of 141.5 mAh g-1 and 125.7 mAh g-1, respectively, and the initial coulombic efficiency is 88.8％. After 25 cycles, it retains 99.8% of the initial discharge capacity at 0.2C rate, showing perfect cyclic property.-
Keywords:
- lithium /
- solid-state reaction /
- LiMn1-xFexPO4 /
- cathode material
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[2] Lee J H, Lee H Y, Ohb S M, Lee S J, Lee K Y, Lee S M 2007 J.Power Sources 166 250
[3] Shi S L, Liu Y G, Zhang J Y, Wang T H 2009 Chin. Phys. B 18 4564
[4] Kang K, Meng Y S, Breger J, Grey C P, Ceder G 2006 Science 311 977
[5] Zhong Z Y, Nie Z X, Du Y L, Ouyang C Y, Shi S Q, Lei M S 2009 Chin. Phys. B 18 2492
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[10] Padhi A K, Nanjundaswamy K S, Giidenough J B 1987 J Electrochem. Soc. 144 1188
[11] Yamada A, Chung S C, Hinokuma K 2001 J. Electrochem. Soc. 148 A224
[12] Amine K, Yasuda H, Yanachi M 2000 Solid State Lett. 3 178
[13] Padhi A K, Nanjundaswamy K S, Goodenough J B 1997 J. Electrochem. Soc. 144 1188
[14] Yamada A, Hosoya M, Chung S C, Kudo Y, Hinokuma K, Liu K Y, Nishi Y. 2003 J. Power Sources 119-121 232
[15] Yamada A, Takei Y, Koizumi H, Sonoyama N, Kanno R 2006 Chem. Mater 18 804
[16] Yao J, Bewlay S, Konstantionv K, Drozd V A, Liu R S, Wang X L, Liu H K, Wang G X 2006 J. Alloys and Compounds 425 362
[17] Kope ￠ M, Yamada A, Kobayashi G, Nishimura S, Kanno R, Mauger A, Gendron F, Julien C M 2009 J Power Sources 189 1154
[18] Andersson A S, Thomas J O, Kalska B, Hggstrm L 2000 Electrochemical and Solid-State Letters 3 66
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[1] Wang Z Y, Li F, Ergang N S, Stein A 2008 Carbon 46 1702
[2] Lee J H, Lee H Y, Ohb S M, Lee S J, Lee K Y, Lee S M 2007 J.Power Sources 166 250
[3] Shi S L, Liu Y G, Zhang J Y, Wang T H 2009 Chin. Phys. B 18 4564
[4] Kang K, Meng Y S, Breger J, Grey C P, Ceder G 2006 Science 311 977
[5] Zhong Z Y, Nie Z X, Du Y L, Ouyang C Y, Shi S Q, Lei M S 2009 Chin. Phys. B 18 2492
[6] Hou X H, Hu S J, Shi L 2010 Acta Phys. Sin. 59 2109 (in Chinese) [侯贤华、胡社军、石 璐 2010 物理学报 59 2109]
[7] Mizushima K, Jones P C, Wiseman P C, Goodenough J B 1980 Res. Bull 15 783
[8] Yamada A, Kudo Y, Liu K Y 2001 J. The Electrochemical Society 148 A747
[9] Li J, Yang C Z, Zhang X G, Zhang J, Xia B J 2009 Acta Phys. Sin. 58 6573 (in Chinese) [李 佳、杨传铮、张熙贵、张 建、夏保佳 2009 物理学报 58 6573]
[10] Padhi A K, Nanjundaswamy K S, Giidenough J B 1987 J Electrochem. Soc. 144 1188
[11] Yamada A, Chung S C, Hinokuma K 2001 J. Electrochem. Soc. 148 A224
[12] Amine K, Yasuda H, Yanachi M 2000 Solid State Lett. 3 178
[13] Padhi A K, Nanjundaswamy K S, Goodenough J B 1997 J. Electrochem. Soc. 144 1188
[14] Yamada A, Hosoya M, Chung S C, Kudo Y, Hinokuma K, Liu K Y, Nishi Y. 2003 J. Power Sources 119-121 232
[15] Yamada A, Takei Y, Koizumi H, Sonoyama N, Kanno R 2006 Chem. Mater 18 804
[16] Yao J, Bewlay S, Konstantionv K, Drozd V A, Liu R S, Wang X L, Liu H K, Wang G X 2006 J. Alloys and Compounds 425 362
[17] Kope ￠ M, Yamada A, Kobayashi G, Nishimura S, Kanno R, Mauger A, Gendron F, Julien C M 2009 J Power Sources 189 1154
[18] Andersson A S, Thomas J O, Kalska B, Hggstrm L 2000 Electrochemical and Solid-State Letters 3 66
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