| 镁热还原气相法白炭黑制备纳米硅及其电化学性能 |
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| 引用本文： | 王文广,许笑目,李斌,任晓,郭玉忠,黄瑞安.镁热还原气相法白炭黑制备纳米硅及其电化学性能[J].无机化学学报,2018,34(12):2219-2226. |
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| 作者姓名： | 王文广 许笑目 李斌 任晓 郭玉忠 黄瑞安 |
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| 作者单位： | 昆明理工大学材料科学与工程学院, 昆明 650093,南京大学昆山创新研究院, 苏州 215647,赣州市芯隆新能源材料有限公司, 赣州 341000,昆明理工大学材料科学与工程学院, 昆明 650093,昆明理工大学材料科学与工程学院, 昆明 650093,昆明理工大学真空冶金国家工程实验室, 昆明 650093 |
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| 基金项目： | 国家自然科学基金（No.51464025）和江西省重点研发计划项目（No.20161BBH80009）资助。 |
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| 摘 要： | 以气相法白炭黑(FS)为Si前驱体,通过镁热还原工艺和对获得的NPs-Si进行SiOx和C复合包覆,制备出NPs-Si@SiOx@C纳米复合结构,将其用作锂电池负极进行电化学性能测试。研究结果表明:镁热还原过程分两步进行,即SiO_2与Mg先生成Mg2Si中间相,Mg2Si继续与SiO_2反应生成Si的反应路径;根据此规律镁热还原气相法白炭黑的Si转化率达87.9%。电化学性能测试中NPs-Si@SiOx@C负极在2.0 A·g-1的电流密度下有1 300 mAh·g-1的容量平台,1 000次循环后的放电比容量为964.2mAh·g-1,容量保持率达75%。
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| 关 键 词： | 纳米硅 高性能负极材料 镁热还原 气相法白炭黑 Mg2Si中间相 |
| 收稿时间： | 2018/7/18 0:00:00 |
| 修稿时间： | 2018/9/12 0:00:00 |
Preparation and Electrochemical Properties of Nano-Si by Magnesiothermic Reduction Reaction of Fumed Silica |
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| WANG Wen-Guang,XU Xiao-Mu,LI Bin,REN Xiao,GUO Yu-Zhong and HUANG Rui-An.Preparation and Electrochemical Properties of Nano-Si by Magnesiothermic Reduction Reaction of Fumed Silica[J].Chinese Journal of Inorganic Chemistry,2018,34(12):2219-2226. |
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| Authors: | WANG Wen-Guang XU Xiao-Mu LI Bin REN Xiao GUO Yu-Zhong and HUANG Rui-An |
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| Institution: | Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China,Kunshan Innovation Institute of Nanjing University, Suzhou, Jiangsu 215347, China,Ganzhou Xinlong New Energy Material Co., Ltd., Ganzhou, Jiangxi 341000, China,Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China,Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China and National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China |
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| Abstract: | Using fumed silica (FS) as Si precursor, the structure NPs-Si@SiOx@C nanocomposite was prepared by magnesiothermic reduction reaction and coating the obtained NPs-Si with SiOx and C, which was used as the lithium battery negative and tested for electrochemical performance. The results show that the magnesiothermic reduction reaction process was carried out in two steps. Firstly, SiO2 reacted with Mg to form Mg2Si intermediate phase, and then Mg2Si continued to react with SiO2 to form Si. And a high Si yield of magnesiothermic reduction reaction of fumed silica reached 87.9% according to the rule. The NPs-Si@SiOx@C anode had a capacity platform of 1 300 mAh·g-1 at a current density of 2.0 A·g-1 in the electrochemical performance test. And the specific capacity is 964.2 mAh·g-1 after 1 000 cycles with a capacity retention rate of 75%. |
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| Keywords: | nano-Si high-performance anode material magnesiothermic reduction fumed silica Mg2Si intermediate phase |
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