锂离子电池LiMn1-xFexPO4(0x<1)正极材料的制备及性能研究

彭薇; 岳敏; 梁奇; 胡社军; 侯贤华

doi:10.7498/aps.60.038202

摘要

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

关键词:

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:

作者及机构信息

(1)华南师范大学物理与电信工程学院,广州 510006; (2)深圳市贝特瑞新能源材料股份有限公司,深圳 518057

基金项目: 国家自然科学基金(批准号: 50771046)资助的课题.

Authors and contacts

(1)BTR New Energy Materials Inc,Shenzhen 518057,China; (2)School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006, China

参考文献

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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
[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, Hggstrm L 2000 Electrochemical and Solid-State Letters 3 66

施引文献

[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, Hggstrm L 2000 Electrochemical and Solid-State Letters 3 66

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