One-step microwave synthesis and characterization of carbon-modified nanocrystalline LiFePO4

被引：74

作者：

Zhang, Yong ^{[1
]}

Feng, Hui ^{[1
]}

Wu, Xingbing ^{[1
]}

Wang, Lizhen ^{[1
]}

Zhang, Aiqin ^{[1
]}

Xia, Tongchi ^{[1
]}

Dong, Huichao ^{[1
]}

Liu, Minghao ^{[1
]}

机构：

[1] Zhengzhou Univ Light Ind, Henan Prov Key Lab Surface & Interface Sci, Zhengzhou 450002, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 11期

关键词：

Microwave method; Exchange current density; Nanocrystalline; LiFePO4/C; LITHIUM-ION BATTERIES; ELECTROCHEMICAL PROPERTIES; CATHODE MATERIAL; COMPOSITE CATHODES; COPRECIPITATION; PRECURSOR; BLACK;

D O I：

10.1016/j.electacta.2008.11.033

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The precursors of LiFePO4 were prepared by a sol-gel method using lithium acetate dihydrate, ferrous sulfate, phosphoric acid, citric acid and polyethylene glycol as raw materials, and then the carbon-modified nanocrystalline LiFePO4 (LiFePO4/C) cathode material was synthesized by a one-step microwave method with the domestic microwave oven. The effect of microwave time and carbon content on the performance of the resulting LiFePO4/C material was investigated. Structural characterization by X-ray diffraction and scanning electron microscopy proved that the olivine phase LiFePO4 was synthesized and the grain size of the samples was several hundred nanometers. Under the optimal conditions of microwave time and carbon content, the charge-discharge performance indicated that the nanosized LiFePO4/C had a high electrochemical capacity at 0.2 C (152 mAh g(-1)) and improved capacity retention; the exchange current density was 1.6977 mA cm(-2). Furthermore, the rate capability was improved effectively after LiFePO4 was modified with carbon, with 59 mAh g(-1) being obtained at 20 C. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3206 / 3210

页数：5

共 20 条

[1] A highly soluble dimethoxybenzene derivative as a redox shuttle for overcharge protection of secondary lithium batteries [J].