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Citation: ZHONG Mei-E, ZHOU Zhi-Hui, ZHOU Zhen-Tao. Electrochemical Performance of High-Density LiFePO₄/C Composites Synthesized by Solid State-Carbothermal Reduction Method[J]. Acta Physico-Chimica Sinica, ;2009, 25(08): 1504-1510. doi: 10.3866/PKU.WHXB20090728 shu

Electrochemical Performance of High-Density LiFePO₄/C Composites Synthesized by Solid State-Carbothermal Reduction Method

1.
College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China

Received Date: 12 January 2009
Available Online: 7 May 2009

High-density LiFePO4/C composites were successfully synthesized by a solid state-carbothermal reduction method using Fe2O3 and citrate ferric as Fe3+ precursors in which the citrate acid radical acted as both reducing agent and carbon source. The reaction mechanism was investigated using thermogravimetric and differential scanning calorimetry (TG-DSC). The structures and physicochemical properties of the LiFePO4/C composites were characterized by X-ray diffraction, scanning electron microscopy, laser particle-size distribution measurement, tap-density testing and galvanostatic charge-discharge. Results indicated that the material calcined at 700 ℃ possessed a crystal olivine structure, a moderate particle size, excellent electrochemical performance and a high tap-density. It had a high initial discharge capacity of 129 mAh·g-1 at 17 mA·g-1 charge-discharge current density without decaying after twenty cycles. This material, which had a multi-peak particle size distribution, consisted of nanometer-sized and micrometer-sized particles and had high tap-density of 1.41 g·cm-3.
- Li-ion battery,
- Cathode material,
- LiFePO4,
- Carbothermal reduction method,
- Citrate ferric
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沈阳化工大学材料科学与工程学院沈阳 110142

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Electrochemical Performance of High-Density LiFePO4/C Composites Synthesized by Solid State-Carbothermal Reduction Method

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通讯作者: 陈斌, bchen63@163.com

Electrochemical Performance of High-Density LiFePO₄/C Composites Synthesized by Solid State-Carbothermal Reduction Method