An improved solid-state reaction route to Mg2+-doped LiFePO4/C cathode material for Li-ion battery

被引：32
作者：
Yang, Zeheng [1 ,2 ]
Xia, Jianfeng [1 ,2 ]
Zhi, Lihua [1 ,2 ]
Zhang, Weixin [1 ,2 ]
Pei, Bo [1 ,2 ]
机构：
[1] Hefei Univ Technol, Sch Chem Engn, Hefei 230009, Anhui, Peoples R China
[2] Hefei Univ Technol, Anhui Key Lab Controllable Chem React & Mat Chem, Hefei 230009, Anhui, Peoples R China
来源：
IONICS | 2014年 / 20卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Lithium-ion battery; Mg2+-doped LiFePO4/C; Electrochemical performance; Solid-state reaction; ELECTROCHEMICAL PROPERTIES; PHOSPHO-OLIVINES; LITHIUM; ELECTRODE;
D O I：
10.1007/s11581-013-0974-2
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An improved solid-state reaction route has been employed to synthesize Mg2+-doped LiFePO4/C nanocomposite cathode by calcining the precursor obtained via evaporating the mixture of ascorbic acid, LiCH3COO center dot 2H(2)O, Mg(CH3COO)(2)center dot 4H(2)O, and amorphous FePO4 nanoparticles in anhydrous ethanol under continuous stirring. Ascorbic acid used here acted as both reducing agent and carbon source. The amorphous FePO4 was pre-prepared via a simple and fast oxidic precipitation method. Electrochemical tests showed that the final product exhibited good rate and cycling performance, with discharge capacities of 145.2 mAh g(-1) at 0.2 C, 129.8 mAh g(-1) at 1 C, 107.6mAh g(-1) at 5 C, and 81.4 mAh g(-1) at 20 C, respectively. The Mg2+-doped LiFePO4/C showed enhanced charge-discharge performance compared with undoped LiFePO4/C, especially at high rates. The enhanced electrochemical performance of the composite could be attributed to a combination result of the fine particle size with narrow particle size distribution, homogeneous carbon coating on the surface of the particles, and magnesium ion doping.
引用
收藏
页码：169 / 174
页数：6
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