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| Preparation and Electrochemical Properties of Nano-Si by Magnesiothermic Reduction Reaction of Fumed Silica |
| Author Name | Affiliation | E-mail | | WANG Wen-Guang | Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China | | | XU Xiao-Mu | Kunshan Innovation Institute of Nanjing University, Suzhou, Jiangsu 215347, China | | | LI Bin | Ganzhou Xinlong New Energy Material Co., Ltd., Ganzhou, Jiangxi 341000, China | | | REN Xiao | Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China | | | GUO Yu-Zhong | Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China | yzguocn62@sina.com | | HUANG Rui-An | National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China | rahuang2002@163.com |
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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%. |
| Keywords: nano-Si high-performance anode material magnesiothermic reduction fumed silica Mg2Si intermediate phase |
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| WANG Wen-Guang,XU Xiao-Mu,LI Bin,REN Xiao,GUO Yu-Zhong,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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