| 碳包覆LiFePO4的一步固相法制备及高温电化学性能 |
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| 引用本文： | 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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| 作者姓名： | 米常焕 曹高劭 赵新兵 |
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| 作者单位： | 浙江大学材料与化学工程学院,杭州,310027 |
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| 基金项目： | 国家自然科学基金(No.50201014)，高校博士基金(No.20010335045)资助项目。 |
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| 摘 要： | 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.
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| 关 键 词： | 锂离子电池 正极材料 LiFePO4 电化学性能 |
| 文章编号： | 1001-4861(2005)04-0556-05 |
| 收稿时间： | 8/3/2004 12:00:00 AM |
| 修稿时间： | 2004年8月3日 |
One-step Solid-state Synthesis and High-temperature Electrochemical Performance of Carbon Coated LiFePO4 Cathode |
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| MI Chang-Huan,CAO Gao-Shao and ZHAO Xin-Bing.One-step Solid-state Synthesis and High-temperature Electrochemical Performance of Carbon Coated LiFePO4 Cathode[J].Chinese Journal of Inorganic Chemistry,2005,21(4):556-560. |
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| Authors: | MI Chang-Huan CAO Gao-Shao and ZHAO Xin-Bing |
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| Institution: | Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027,Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 and Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 |
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| Abstract: | |
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| Keywords: | lithium-ion battery cathode materials lithium iron phosphate electrochemical performance |
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