| 碳包覆LiFePO4的一步固相法制备及高温电化学性能 |
| One-step Solid-state Synthesis and High-temperature Electrochemical Performance of Carbon Coated LiFePO4 Cathode |
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| 摘要: |
| 关键词: 锂离子电池 正极材料 LiFePO4 电化学性能 |
| 基金项目: |
| Abstract: Carbon coated LiFePO4 cathode material was synthesized by one-step solid-state reaction and characterized by X-ray diffraction (XRD), field-emission-scanning electron microscope (FESEM). Electrochemical performances of the material as cathode in lithium-ion battery were investigated at medium and elevated temperature (30 and 55 ℃) by galvanostatic charge-discharge and A.C. impedance tests. The results show that carbon coated LiFePO4 powder exhibits a well-crystallized olivine structure and spherical morphology with an average particle size of about 500 nm. Galvanostatic charge-discharge tests show that the reversible discharge capacity at 1 C and 1.5 C rates was improved from 121 and 105 mAh·g-1 at 30 ℃ to 136 and 123 mAh·g-1 at 55℃, respectively, while the enhancement of high temperature on electrochemical performance is less obvious at a rate lower than 0.5 C. Impedance spectra analyses indicate that the cathode material has a remarkably higher lithium-ion diffusivity at 55 ℃ than that at 30 ℃, which improves the electrochemical performance at high temperature. |
| Keywords: lithium-ion battery cathode materials lithium iron phosphate electrochemical performance |
| 投稿时间：2004-08-03 修订日期：2004-11-10 |
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| 米常焕,曹高劭,赵新兵.碳包覆LiFePO4的一步固相法制备及高温电化学性能[J].无机化学学报,2005,21(4):556-560. |
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