Citation:
DONG Jing, ZHONG Ben-He, ZHONG Yan-Jun, TANG Yan, LIU Heng, GUO Xiao-Dong. EDTA-Assisted Hydrothermal Synthesis for Rod-Like LiFePO4 with Enhanced Electrochemical Properties[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(10): 2257-2264.
doi:
10.3969/j.issn.1001-4861.2013.00.333
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Rod-like LiFePO4 was synthesized by hydrothermal method using ethylene diamine tetraacetic acid (EDTA) as complexing agent to control the growth of the crystal. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge test. The results show that EDTAhas great influence on the morphology and electrochemical performance. The crystal morphology develops from irregular particles to rod-like particles and the thickness of the particles decreases from 140~200 nm to 40~90 nm by adding EDTAand the obtained LiFePO4/Cwith EDTAexhibits a homogenous carbon coating layer with a thickness of ~3.5 nm. The discharge capacity is 167 mAh·g-1 (close to the theoretical capacity of 170 mAh·g-1) at 0.1C. The CVand EISresults indicate the samples prepared with EDTAhave a lower polarization and lower interfacial resistance.
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[1]
[1] Padhi A K, Nanjundaswamy K S, Goodenough J B. J. Elect- rochem. Soc., 1997,144(4):1188-1194 [2] Chung S Y, Chiang Y M. Electrochem. Solid-State Lett., 2003,6:A278-A281 [3] Srinivasan V, Newman J. J. Electrochem. Soc., 2004,151: A1517-A1529 [4] Chen Z H, Dahn J R. J. Electrochem. Soc., 2002,149:A1184 -A1189 [5] Wilcox J D, Doeff M M, Marcinek M, et al. J. Electrochem. Soc., 2007,154:A389-A395 [6] WANG Xiao-Juan(王小娟), LI Xin-Hai(李新海), WANG Zhi-Xing(王志兴), et al. J. Funct. Mater.(Gongneng Cailiao), 2009,40(12):1996-2003 [7] YU Hong-Ming(于红明), ZHENG Wei(郑威), CAO Gao-Shao (曹高劭), et al. Acta Phys.-Chim. Sin.(Wuli Huaxue Xuebao), 2009,25(11):2186-2190 [8] XU Rui(徐瑞), ZHONG Ben-He(钟本和), GUO Xiao-Dong (郭孝东) et al. Chinese J. Inorg. Chem.(Wuji Huaxue Xuebao), 2012,28(7):1506-1512 [9] TANG Hong(唐红), GUO Xiao-Dong(郭孝东), TANG Yan(唐 艳), et al. Chinese J. Inorg. Chem.(Wuji Huaxue Xuebao), 2012,28(4):809-814 [10]Teng F, Santhanagopalan S, Lemmens R, et al. Solid State Sci., 2010,12:952-955 [11]Lu Z G, Chen H L, Robert R, et al. Chem. Mater., 2011,23: 2848-2859 [12]Rangappa D, Sone K, Kudo T, et al. J. Power Sources, 2010,195:6167-6171 [13]Lee M H, Kim J Y, Song H K. Chem. Commun., 2010,46: 6795-6797 [14]He L H, Zhao Z W, Liu X H, et al. Trans. Nonferrous Met. Soc. China, 2012,22:1766-1770 [15]Saravanan K, Balaya P, Reddy M V, et al. Energy Environ. Sci., 2010,3:457-464 [16]Wang Z L, Su S R, Yu C Y, et al. J. Power Sources, 2008, 184:633-636 [17]Li C F, Hua N, Wang C Y, et al. J. Solid State Electrochem., 2011,15:1971-1976 [18]Zhu Z F, Du J, Li J Q, et al. Ceram. Int., 2012,38:4827- 4834 [19]Ha J H, Muralidharan P, Kim D K. J. Alloys Compd., 2009, 475:446-451 [20]Adldinger H K, Calnek B W. Archiv Für Die Gesamte Virusforschung, 1971,34:391-395 [21]Lan Y C, Wang X D, Zhang J W, et al. Powder Technol., 2011,212:327-331 [22]Dimesso L, Spanheimer C, Jacke S, et al. J. Power Sources, 2011,196:6729-6734 [23]Shin H C, Cho W I, Jang H. Electrochim. Acta, 2006,52: 1472-1476 [24]Yang K R, Deng Z H, Suo J S, J. Power Sources, 2012,201: 274-279 [25]Kwon S J, Kim C W, Jeong W T, et al. J. Power Sources, 2004,137:93-99
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