文献类型：期刊文献

英文题名：Effects of carbon coating and metal ions doping on low temperature electrochemical properties of LiFePO₄ cathode material

作者：Zhang, Huang[1];Xu, Yunlong[1];Zhao, Chongjun[1];Yang, Xu[1];Jiang, Qiong[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：83

起止页码：341

外文期刊名：ELECTROCHIMICA ACTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000311327100046)】；

基金：The work is partially supported by Shanghai Nanotechnology Promotion Center (SNPC) (0852nm02300) and Shanghai International Science and Technology Cooperation Foundation (08230705600).

语种：英文

外文关键词：Lithium iron phosphate; Doping; Carbon aerogel; Low temperature; High rate

摘要：The olivine-type lanthanum and magnesium doped Li0.99La0.01Fe0.9Mg0.1PO4/carbon aerogel composite is synthesized via a simple solution impregnation process using carbon aerogel (CA) as templates, characterized by XRD, SEM, EDS. HR-TEM, galvanostastic charge/discharge test and EIS. The Rietveid refinement results of lattice parameters of the samples indicate that the La3+ and Mg2+ have been successfully doped into the phospho-olivine structure without destroying the crystal structure. The composite has uniform particle size and porous structure, which is believed to be beneficial to its electronic conductivity. It is noted that the capacitance is higher under lower discharging rates at -20 degrees C. and the specific capacity of 1 C, 10 C, 20C and 50C are 120.3 mAh g(-1), 85.4 mAh g(-1), 75.3 mAh g(-1) and 56.6 mAh g(-1). The results indicate that both ions doping and carbon aerogel coating are effective way to improve the electrochemical performance of the composite at low temperature and high rate for lithium batteries. (C) 2012 Elsevier Ltd. All rights reserved.