Preparation and electrochemical properties of LiMn1-xFexPO4/C composite cathode materials for lithium ion batteries

被引：20
作者：
Li, Shanshan [1 ]
Su, Zhi [1 ]
Muslim, Arzugul [1 ]
Jiang, Xiaokang [2 ]
Wang, Xinyu [1 ]
机构：
[1] Xinjiang Normal Univ, Coll Chem & Chem Engn, Urumqi 830054, Xinjiang, Peoples R China
[2] Yili Normal Univ, Coll Phys Sci & Technol, Yining 835000, Xinjiang, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2015年 / 41卷 / 09期
基金：
中国国家自然科学基金;
关键词：
LiMn1-xFexPO4/C; Nanoparticles; Sol-gel; Electrochemical properties; PHOSPHO-OLIVINES; PERFORMANCE; LIFEPO4; FE;
D O I：
10.1016/j.ceramint.2015.05.061
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Carbon-coated LiMn1-xFexPO4/C (x=0, 0.1, 0.3, 0.5) nanoparticles have been synthesized by a two-step sol-gel method. The materials show good crystallinity and a uniform grain size of about 100 nm. The LiMn1-xFexPO4/C composites deliver the best initial specific discharge capacities of 160 mA h g(-1) at 0.05 C for x=0.3, LiMn0.7Fe0.3PO4/C retained 157 mA h g(-1) (97.8%) after 40 cycles, demonstrating excellent cyclability. Results suggest that the improved cycling stability of the doped composites results from mitigated Mn2+ dissolution due to Fe2+ substitution. Impedance measurements reveal the R-ct and W-s impedance of the doped composites to be much lower than the non-doped samples. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：11132 / 11135
页数：4
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