| 合成温度对LiFePO_4/C复合材料电化学性能的影响 |
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| 引用本文： | 郑威,余红明,曹高劭,赵新兵.合成温度对LiFePO_4/C复合材料电化学性能的影响[J].中国有色金属学报,2010,20(3). |
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| 作者姓名： | 郑威 余红明 曹高劭 赵新兵 |
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| 作者单位： | 浙江大学,材料科学与工程学系,杭州310027 |
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| 基金项目： | 浙江省科技计划资助项目 |
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| 摘 要： | 以FePO4为铁源、Li2CO3为锂源、聚丙烯为还原剂和碳源,采用一步固相法合成原位碳包覆磷酸亚铁锂(LiFePO4/C)复合材料,研究合成温度对材料LiFePO4/C复合材料电化学性能的影响。采用X射线衍射、扫描电镜和拉曼光谱技术对合成产物的晶体结构、表面形貌和碳结构进行表征,通过电化学阻抗谱(EIS)和充放电测试对材料的电化学性能进行测试和分析。结果表明:在600～750℃温度范围内都可合成纯LiFePO4/C复合材料,随着合成温度的升高,材料颗粒尺寸和石墨化程度都将增大;600℃保温8h合成的材料颗粒尺寸为100～500nm,其1C放电比容量达到144.2mA·h/g,5C放电比容量达到119mA·h/g。
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| 关 键 词： | 锂离子电池 正极材料 |
Effect of synthesis temperature on electrochemical performances of LiFePO_4/C composites |
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| ZHENG Wei,YU Hong-ming,CAO Gao-shao,ZHAO Xin-bing.Effect of synthesis temperature on electrochemical performances of LiFePO_4/C composites[J].The Chinese Journal of Nonferrous Metals,2010,20(3). |
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| Authors: | ZHENG Wei YU Hong-ming CAO Gao-shao ZHAO Xin-bing |
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| Affiliation: | ZHENG Wei,YU Hong-ming,C AO Gao-shao,ZHAO Xin-bing (Department of Materials Science , Engineering,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | LiFePO4/C composites were synthesized by one-step solid-state reaction using FePO4 and Li2CO3 as raw materials and polypropylene as reductive agent and carbon source.The effect of synthesis temperature on the electrochemical performances of LiFePO4/C composites was studied.The microstructure,morphology of the products and the structure of carbon were characterized by X-ray diffractometry (XRD),scanning electron microscopy (SEM) and Raman microprobe spectra.The electrochemical impedance spectroscopy (EIS) an... |
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| Keywords: | LiFePO4/C |
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