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Citation: LIU Su-Qin, NG Ben-Li, HUANG Ke-Long, ZHANG Ge, LI Shi-Cai. Effect of Calcination Temperature on the Compositions and Electrochemical Performance of Products in the Synthesis of LiFePO₄[J]. Acta Physico-Chimica Sinica, ;2007, 23(07): 1117-1122. doi: 10.3866/PKU.WHXB20070730 shu

Effect of Calcination Temperature on the Compositions and Electrochemical Performance of Products in the Synthesis of LiFePO₄

1.
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 8 December 2006
Available Online: 29 April 2007

LiFePO4/C composite cathode materials were synthesized by carbothermal reduction (CTR) method using FePO4 as precursor. The precursors and the products were characterized by TG-DTA, FTIR, XRD, and the reaction mechanism was investigated. The compositions and electrochemical performance of the products at different calcination temperatures were studied. The results showed that LiFePO4 in the sample prepared at 300 ℃ was primary phase, so the crystallization temperature in this route was lower than that of other methods. At 300, 400, 500 ℃, Li3PO4 and Fe2O3 as impurity phases existed in the samples and the higher temperature led to less impurity phases. The sample calcined at 600 ℃ had no impurity, but Li4P2O7 appeared at 700 ℃. The sample prepared at 600 ℃ for 24 h had the best electrochemical performance, which could deliver a discharge capacity of 146 mAh·g-1 at 0.1C and retain a discharge capacity of 141 mAh·g-1 after 15 cycles.
- Calcination temperature; LiFePO4; Compositions; Electrochemical performance
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Effect of Calcination Temperature on the Compositions and Electrochemical Performance of Products in the Synthesis of LiFePO4

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通讯作者: 陈斌, bchen63@163.com

Effect of Calcination Temperature on the Compositions and Electrochemical Performance of Products in the Synthesis of LiFePO₄