Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 5    May 2010

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Electrochemical performance of Ti4+-doped LiFePO4 synthesized by co-precipitation and post-sintering method
WU Ling(伍 凌), WANG Zhi-xing(王志兴), LI Xin-hai(李新海), LI Ling-jun(李灵均),
GUO Hua-jun(郭华军), ZHENG Jun-chao(郑俊超), WANG Xiao-juan(王小娟)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:Ti4+-mixed FePO4·xH2O precursor was prepared by co-precipitation method, with which Ti4+ cations were added in the process of preparing FePO4·xH2O to pursue an effective and homogenous doping way. Ti4+-doped LiFePO4 was prepared by an ambient-reduction and post-sintering method using the as-prepared precursor, Li2CO3 and oxalic acid as raw materials. The samples were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), electrochemical impedance spectroscopy (EIS), and electrochemical charge/discharge test. Effects of Ti4+-doping and sintering temperature on the physical and electrochemical performance of LiFePO4 powders were investigated. It is noted that Ti4+-doping can improve the electrochemical performance of LiFePO4 remarkably. The Ti4+-doped sample sintered at 600 ℃ delivers an initial discharge capacity of 150, 130 and 125 mA·h/g with 0.1C, 1C and 2C rates, respectively, without fading after 40 cycles.

 

Key words: lithium-ion battery; cathode material; LiFePO4; Ti4+-doping; co-precipitation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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