The effect of ammonia concentration on the morphology and electrochemical properties of LiFePO4 synthesized by ammonia assisted hydrothermal route

被引：42

作者：

Shu, Hongbo ^{[1
]}

Wang, Xianyou ^{[1
]}

Wu, Qiang ^{[1
]}

Liu, Li ^{[1
]}

Liang, Qianqian ^{[1
]}

Yang, Shunyi ^{[2
]}

Ju, Bowei ^{[1
]}

Yang, Xiukang ^{[1
]}

Zhang, Xiaoyan ^{[1
]}

Wang, Yingping ^{[1
]}

Wei, Qiliang ^{[1
]}

Hu, Benan ^{[1
]}

Liao, Yuqing ^{[1
]}

Jiang, Huimin ^{[1
]}

机构：

[1] Xiangtan Univ, Sch Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Hunan, Peoples R China

[2] BTR Battery Mat Co Ltd, Shenzhen 518106, Guangdong, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2012年 / 76卷

基金：

中国国家自然科学基金;

关键词：

Lithium ion batteries; LiFePO4/C composite; Ammonia assisted hydrothermal synthesis; Ammonia concentration; Electrochemical properties; LITHIUM-ION BATTERIES; SOL-GEL SYNTHESIS; CATHODE MATERIALS; ELECTRODE MATERIALS; POSITIVE-ELECTRODE; PHOSPHO-OLIVINES; IRON PHOSPHATE; PARTICLE-SIZE; PERFORMANCE; CARBON;

D O I：

10.1016/j.electacta.2012.04.156

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The LiFePO4/C composites with different morphology are synthesized by an ammonia assisted hydrothermal method at various ammonia concentrations (from 0 to 1.6 mol L-1) using inexpensive Fe(NO3)(3) and LiOH as raw materials. The influences of the ammonia concentration on the structure, morphology and electrochemical properties of the LiFePO4/C composite are investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), galvanostatic charge/discharge tests and electrochemical impedance spectroscopy (EIS). The results demonstrate that the ammonia concentrations markedly impact the morphology and electrochemical properties of the LiFePO4/C. With the change of ammonia concentrations, the LiFePO4/C synthesized with 0.4 mol L-1 ammonia shows the smallest average particle size, the most uniform microsphere particle distribution and relatively high tap density (1.27 g cm(-3)). In addition, the sample appears a high discharge capacity of 153.9 mAhg(-1) at the first cycle as well as stable cycling performance (the capacity was not almost changed till 100 cycles) at a rate of 1C (170 mA g(-1)). Moreover, it exhibits a good rate capability and still shows a high discharge capacity of over 125 mAh g(-1) even at a rate of 5C. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.

引用

页码：120 / 129

页数：10

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