| 水热法制备树叶状LiFePO4/C复合正极材料 |
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| 引用本文： | 云强,周园,海春喜,申月,李翔,张丽娟,李松,丁秀萍.水热法制备树叶状LiFePO4/C复合正极材料[J].无机化学学报,2015,31(5):880-887. |
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| 作者姓名： | 云强 周园 海春喜 申月 李翔 张丽娟 李松 丁秀萍 |
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| 作者单位： | 中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院大学, 北京 100049;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院大学, 北京 100049;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院大学, 北京 100049;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008;中国科学院大学, 北京 100049;中国科学院青海盐湖研究所盐湖资源化学重点实验室, 西宁 810008 |
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| 基金项目： | 国家高技术研究发展计划(863)(No.2013AA110100);国家重点基础研究发展计划(973)(No.2014CB660806);中国科学院“西部之光”人才培养计划(No.Y412041007);2014年西宁市科技项目(No.2014-6-24)资助。 |
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| 摘 要： | 采用柠檬酸辅助水热法合成了高分散性树叶状LiFePO4/C复合正极材料。利用X射线衍射、傅里叶红外光谱、扫描电镜、高分辨率透射电镜和选区电子衍射分析了材料的形貌结构。结果表明,柠檬酸对树叶状LiFePO4/C复合材料的形成具有促进作用。该材料的最大暴露晶面为(010)晶面,且分散性较好。与颗粒状LiFePO4/C材料相比,该材料呈现出更高的放电比容量和更好的倍率性能,在0.1C和5C倍率下,放电比容量分别为158和126mAh·g-1,其原因是由于锂离子沿010]方向的扩散距离缩短,从而使锂离子扩散系数显著增大。
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| 关 键 词： | 材料科学 水热合成 电化学 LiFePO4/C 树叶状 柠檬酸 |
| 收稿时间： | 2015/1/27 0:00:00 |
| 修稿时间： | 2015/2/25 0:00:00 |
Hydrothermal Synthesis of Leaf-like LiFePO4/C Cathode Composites |
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| YUN Qiang,ZHOU Yuan,HAI Chun-Xi,SHEN Yue,LI Xiang,ZHANG Li-Juan,LI Song and DING Xiu-Ping.Hydrothermal Synthesis of Leaf-like LiFePO4/C Cathode Composites[J].Chinese Journal of Inorganic Chemistry,2015,31(5):880-887. |
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| Authors: | YUN Qiang ZHOU Yuan HAI Chun-Xi SHEN Yue LI Xiang ZHANG Li-Juan LI Song and DING Xiu-Ping |
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| Institution: | Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China |
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| Abstract: | Highly-dispersed LiFePO4/C composite with micro-leaf structure was synthesized by a facile citric acid-assisted hydrothermal method in this study. Crystal structure and morphology of samples were investigated by XRD, FTIR, SEM, HR-TEM and selected area electron diffraction (SAED). The characterization results indicate that citric acid accelerates the formation of leaf-like LiFePO4/C composite. The as-prepared leaf-like LiFePO4/C composite with an enlarged (010) plane has high dispersibility. By comparing the electrochemical properties of the LiFePO4/C particles in our study, the LiFePO4/C micro-leaves exhibit larger discharge capacity and better rate performance, which deliver a discharge capacity of 158 mAh·g-1 at 0.1C and 126 mAh·g-1 at 5C. The enhanced performance perhaps is attributed to the reduced Li-ion diffusion paths along the 010] direction and larger Li-ion diffusion coefficient. |
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| Keywords: | materials science hydrothermal synthesis electrochemistry LiFePO4/C micro-leaf citric acid |
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