Ge Gaofeng, Li Guocheng, Wang Xiancheng, Chen Xiaoxue, Fu Lin, Liu Xiaoxiao, Mao Eryang, Liu Jing, Yang Xuelin, Qian Chenxi, Sun Yongming
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
College of Electrical Engineering and New Energy, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China.
Nano Lett. 2021 Apr 14;21(7):3127-3133. doi: 10.1021/acs.nanolett.1c00317. Epub 2021 Mar 18.
Silicon (Si)-based material is a promising anode material for next-generation lithium-ion batteries (LIBs). Herein, we report the fabrication of a silicon oxide-carbon (SiO/C) nanocomposite through the reaction between silicon particles with fresh surface and HO in a mild hydrothermal condition, as well as conducting carbon coating synchronously. We found that controllable oxidation could be realized for Si particles to produce uniform SiO after the removal of the native passivation layer. The uniform oxidation and conductive coating offered the as-fabricated SiO/C composite good stability at both particle and electrode level over electrochemical cycling. The as-fabricated SiO/C composite delivered a high reversible capacity of 1133 mAh g at 0.5 A g with 89.1% capacity retention after 200 cycles. With 15 wt % SiO/C composite, graphite-SiO/C hybrid electrode displayed a high reversible specific capacity of 496 mAh g and stable electrochemical cycling with a capacity retention of 90.1% for 100 cycles.
硅基材料是下一代锂离子电池（LIBs）颇具前景的负极材料。在此，我们报道了通过新鲜表面的硅颗粒与HO在温和水热条件下反应制备氧化硅-碳（SiO/C）纳米复合材料，并同步进行碳包覆。我们发现，在去除天然钝化层后，硅颗粒可实现可控氧化以生成均匀的SiO。均匀的氧化和导电包覆使所制备的SiO/C复合材料在电化学循环过程中在颗粒和电极层面均具有良好的稳定性。所制备的SiO/C复合材料在0.5 A g电流密度下具有1133 mAh g的高可逆容量，200次循环后容量保持率为89.1%。含有15 wt% SiO/C复合材料的石墨-SiO/C混合电极显示出496 mAh g的高可逆比容量以及稳定的电化学循环性能，100次循环后容量保持率为90.1%。
