Enhanced rate performance of LiFePO4/C by co-doping titanium and vanadium
作者： Yun-Fei Long , Jing Su , Xiao-Ru Cui , Xiao-Yan Lv , Yan-Xuan Wen
DOI: 10.1016/J.SOLIDSTATESCIENCES.2015.07.011
关键词:
摘要: Abstract V and Ti co-doped LiFePO 4 /C composites were synthesized by a wet milling assisted carbothermal reduction technology. The structure, morphology electrochemical performance of the samples characterized X-ray diffraction (XRD), photoelectron spectroscopy (XPS), magnetic susceptibility, positron annihilation lifetime spectra (PAS), scanning electron microscope (SEM), charge/discharge tests, impedance (EIS) cyclic voltammograms (CV). results showed that kept olivine structure , but synergistic effects between 3+ 4+ in lattice can increase disorder degree create Li + vacancies /C, thus improve electronic conductivity diffusion coefficient. LiV 0.069 0.025 Fe 0.905 PO delivers an initial discharge capacity 144.1 mAh g −1 with retention ratio 99.4%, 96.3% 93.6% after 100, 200 300 cycles at 10C, respectively. Remarkably, it still gives high 124.8 mAh g even rate 20C.
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G. X. Wang, S. Bewlay, S. A. Needham, H. K. Liu, R. S. Liu, V. A. Drozd, J.-F. Lee, J. M. Chen, Synthesis and characterization of LiFePO4 and LiTi0.01Fe0.99PO4 cathode materials Journal of The Electrochemical Society. ,vol. 153, ,(2006) , 10.1149/1.2128766
A. K. Padhi, K. S. Nanjundaswamy, C. Masquelier, S. Okada, J. B. Goodenough, Effect of Structure on the Fe3 + / Fe2 + Redox Couple in Iron Phosphates Journal of The Electrochemical Society. ,vol. 144, pp. 1609- 1613 ,(1997) , 10.1149/1.1837649
Yuzhan Li, Zhen Zhou, Manman Ren, Xueping Gao, Jie Yan, Electrochemical performance of nanocrystalline Li3V2(PO4)3/carbon composite material synthesized by a novel sol–gel method Electrochimica Acta. ,vol. 51, pp. 6498- 6502 ,(2006) , 10.1016/J.ELECTACTA.2006.04.036
Lingjun Li, Xinhai Li, Zhixing Wang, Ling Wu, Junchao Zheng, Huajun Guo, Stable cycle-life properties of Ti-doped LiFePO4 compounds synthesized by co-precipitation and normal temperature reduction method Journal of Physics and Chemistry of Solids. ,vol. 70, pp. 238- 242 ,(2009) , 10.1016/J.JPCS.2008.10.012
Jia-Yan Luo, Li-Juan Chen, Yu-Jun Zhao, Ping He, Yong-Yao Xia, The effect of oxygen vacancies on the structure and electrochemistry of LiTi2(PO4)3 for lithium-ion batteries: A combined experimental and theoretical study Journal of Power Sources. ,vol. 194, pp. 1075- 1080 ,(2009) , 10.1016/J.JPOWSOUR.2009.06.050
Ningyu Gu, Hao Wang, Yang Li, Hongyu Ma, Xinghua He, Zhenyu Yang, Synthesis of LiFe(1−x)V x PO4/C composite cathode materials with high performance via an aqueous solution–evaporation method Journal of Solid State Electrochemistry. ,vol. 18, pp. 771- 777 ,(2014) , 10.1007/S10008-013-2319-5
Ting-Feng Yi, Xiao-Ya Li, Haiping Liu, Jie Shu, Yan-Rong Zhu, Rong-Sun Zhu, Recent developments in the doping and surface modification of LiFePO 4 as cathode material for power lithium ion battery Ionics. ,vol. 18, pp. 529- 539 ,(2012) , 10.1007/S11581-012-0695-Y
M.S. Bhuvaneswari, N.N. Bramnik, D. Ensling, H. Ehrenberg, W. Jaegermann, Synthesis and characterization of Carbon Nano Fiber/LiFePO4 composites for Li-ion batteries Journal of Power Sources. ,vol. 180, pp. 553- 560 ,(2008) , 10.1016/J.JPOWSOUR.2008.01.090
Hongbo Shu, Xianyou Wang, Qiang Wu, Benan Hu, Xiukang Yang, Qiliang Wei, Qianqian Liang, Yansong Bai, Meng Zhou, Chun Wu, Manfang Chen, Aiwen Wang, Lanlan Jiang, Improved electrochemical performance of LiFePO4/C cathode via Ni and Mn co-doping for lithium-ion batteries Journal of Power Sources. ,vol. 237, pp. 149- 155 ,(2013) , 10.1016/J.JPOWSOUR.2013.03.035
Dragana Jugović, Dragan Uskoković, A review of recent developments in the synthesis procedures of lithium iron phosphate powders Journal of Power Sources. ,vol. 190, pp. 538- 544 ,(2009) , 10.1016/J.JPOWSOUR.2009.01.074