| 锂离子电池正极材料Li2FeSiO4/C的冻干干燥法制备及电化学性质 |
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| 引用本文： | 张冬,李浩鸣,邱海龙,陈岗,岳惠娟,刘安华.锂离子电池正极材料Li2FeSiO4/C的冻干干燥法制备及电化学性质[J].高等学校化学学报,2017,38(8):1436. |
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| 作者姓名： | 张冬 李浩鸣 邱海龙 陈岗 岳惠娟 刘安华 |
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| 作者单位： | 1. 吉林大学物理学院, 新型电池物理与技术教育部重点实验室, 长春 130012;
2. 吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012;
3. 厦门大学材料学院, 高性能陶瓷纤维教育部重点实验室, 厦门 361005 |
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| 基金项目： | 吉林省科技厅科技发展计划项目，吉林省自然科学基金，厦门大学高性能陶瓷纤维教育部重点实验室开放课题(批准号: 201602)资助.Supported by the Science and Technology Development Planning of Jilin Province |
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| 摘 要： | 通过冻干干燥法辅助制备了分布均匀的纳米Li2FeSiO4材料.通过X射线衍射（XRD）、拉曼光谱（Raman）、扫描电子显微镜（SEM）、N2吸附-脱附、循环伏安（CV）和充放电测试等手段对材料的结构及电化学性能进行了表征.结果表明，冻干法处理后得到的Li2FeSiO4材料颗粒尺寸更小，能够缩短锂离子的扩散距离；同时较大的比表面积可以使材料与电解液接触更加充分.在1.5~4.8 V电压范围内，与采用传统烘干干燥法制备的材料相比，采用冻干法制备的材料表现出更高的可逆比容量，并具有良好的倍率性能和循环稳定性.
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| 关 键 词： | 锂离子电池 正极材料 硅酸亚铁锂 冻干法 锂离子电池 正极材料 硅酸亚铁锂 冻干法 |
| 收稿时间： | 2016-12-22 |
Freeze-drying Synthesis and Characterization of Li2FeSiO4/C Cathode Materials for Lithium Ion Batteries |
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| ZHANG Dong,LI Haoming,QIU Hailong,CHEN Gang,YUE Huijuan,LIU Anhua.Freeze-drying Synthesis and Characterization of Li2FeSiO4/C Cathode Materials for Lithium Ion Batteries[J].Chemical Research In Chinese Universities,2017,38(8):1436. |
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| Authors: | ZHANG Dong LI Haoming QIU Hailong CHEN Gang YUE Huijuan LIU Anhua |
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| Institution: | 1. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, China;
2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China;
3. Key Laboratory of High Performance Ceramic Fibers of Ministry of Education, College of Materials, Xiamen University, Xiamen 361005, China |
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| Abstract: | Li2FeSiO4/C nanocomposites were prepared by freeze-dying synthesis.X-ray diffraction, Raman spectrometry, field emission scanning electron microscopy and N2 adsorption-desorption were used to investigate the effect of dry method on the physical characteristics of Li2FeSiO4/C.The results show that Li2FeSiO4 obtained by freeze-drying method(DG) exhibits smaller particle size and larger specific surface area.The electrochemical performance was studied by galvanostatic charge-discharge and electrochemical impedance spectra.Compared to the Li2FeSiO4 obtained by ordinary drying method(HG), DG exhibits better rate capability, and the discharge capacity of 106.7 mA·h/g can be achieved at 2C rate. |
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| Keywords: | Lithium ion battery Cathode material Li2FeSiO4 Freeze-drying |
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