Reaction mechanism and electrochemical performance of LiFePO4/C cathode materials synthesized by carbothermal method

被引：77

作者：

Yu, Feng ^{[1
,2
]}

Zhang, Jingjie ^{[1
]}

Yang, Yanfeng ^{[1
]}

Song, Guangzhi ^{[1
]}

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 28期

关键词：

LiFePO4; Fe2P; Cathode material; Lithium ion battery; Spray drying and carbothermal method; ELECTRODE MATERIALS; CARBON-SOURCES; OLIVINE-LIKE; LITHIUM; IRON; COMPOSITE; MICROSPHERE; TEMPERATURE; PHOSPHATES; GLASSES;

D O I：

10.1016/j.electacta.2009.07.071

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Spray drying and carbothermal method was employed to investigate reaction mechanism and electrochemical performance of LiFePO4/C cathode by using different carbon sources. Micro-structural variations of LiFePO4/C precursors using different carbon sources were studied by Thermo-gravimetric (TG)/Differential Thermal Analysis (DTA). The LiFePO4/C samples were characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) absorption spectroscopy. The results indicated that the crystallization temperature of LiFePO4 was 453 degrees C, while the transform temperature was 539 degrees C from Li3Fe2(PO4)(3) to LiFePO4. At 840 degrees C, LiFePO4/C sample with an excess of impurity phase Fe2P gave much poorer electrochemical performance. The severe decomposition of LiFePO4/C happened at 938 degrees C and generated impurity phases Li4P2O7 and Fe2P. The clear discharge platform of Fe2P emerged at around 2.2V. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：7389 / 7395

页数：7

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