Li Xinxi, Zheng Binghe, Liu Long, Zhang Guoqing, Liu Zhongyun, Luo Wen
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, P.R. China.
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr. NW, Atlanta, Georgia 30332, United States.
ACS Omega. 2020 Oct 12;5(42):27368-27373. doi: 10.1021/acsomega.0c03693. eCollection 2020 Oct 27.
Nanostructured hollow silicon has attracted tremendous attention as high-performance anode materials in Li-ion battery applications. However, the large-scale production of pure hollowed silicon with long cycling stability is still a great challenge. Here, we report an improved low-temperature molten salt strategy to synthesize nanosized hollowed silicon with a stable structure on a large scale. As an anode material for rechargeable lithium-ion batteries, it exhibits a high capacity, excellent long cycling, and steady rate performance at different current densities. Especially, a high reversible capacity of 2028.6 mA h g at 0.5 A g after 150 cycles, 994.3 mA h g at 3 A g after 500 cycles, and 538.8 mAh g at 5 A g after 1200 cycles could be obtained. This kind of nanosized hollowed silicon can be applied as a basic anode material in silicon-based composites for long-term stable Li-ion battery applications.
纳米结构的中空硅作为锂离子电池应用中的高性能负极材料受到了极大关注。然而，大规模生产具有长循环稳定性的纯中空硅仍然是一个巨大挑战。在此，我们报道了一种改进的低温熔盐策略，用于大规模合成具有稳定结构的纳米级中空硅。作为可充电锂离子电池的负极材料，它在不同电流密度下表现出高容量、优异的长循环性能和稳定的倍率性能。特别是，在150次循环后，0.5 A g时可逆容量高达2028.6 mA h g，在500次循环后，3 A g时为994.3 mA h g，在1200次循环后，5 A g时为538.8 mAh g。这种纳米级中空硅可作为硅基复合材料中的基础负极材料，用于长期稳定的锂离子电池应用。
