Han Na, Li Jianjiang, Wang Xuechen, Zhang Chuanlong, Liu Gang, Li Xiaohua, Qu Jing, Peng Zhi, Zhu Xiaoyi, Zhang Lei
School of Material Science and Engineering, School of Environmental Science and Engineering, Chemical Experimental Teaching Center, School of Automation, Qingdao University, No. 308, Ningxia Road, Qingdao 266071, China.
Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.
Nanomaterials (Basel). 2021 Mar 11;11(3):699. doi: 10.3390/nano11030699.
The further deployment of silicon-based anode materials is hindered by their poor rate and cycling abilities due to the inferior electrical conductivity and large volumetric changes. Herein, we report a silicon/carbon nanotube (Si/CNT) composite made of an externally grown flexible carbon nanotube (CNT) network to confine inner multiple Silicon (Si) nanoparticles (Si NPs). The in situ generated outer CNTs networks, not only accommodate the large volume changes of inside Si NPs but also to provide fast electronic/ionic diffusion pathways, resulting in a significantly improved cycling stability and rate performance. This Si/CNT composite demonstrated outstanding cycling performance, with 912.8 mAh g maintained after 100 cycles at 100 mA g, and excellent rate ability of 650 mAh g at 1 A g after 1000 cycles. Furthermore, the facial and scalable preparation method created in this work will make this new Si-based anode material promising for practical application in the next generation Li-ion batteries.
由于导电性差和体积变化大，硅基负极材料的倍率性能和循环性能不佳，这阻碍了其进一步应用。在此，我们报道了一种硅/碳纳米管（Si/CNT）复合材料，它由外部生长的柔性碳纳米管（CNT）网络构成，用于包裹内部多个硅（Si）纳米颗粒（Si NPs）。原位生成的外部CNT网络不仅能够适应内部Si NPs的大体积变化，还能提供快速的电子/离子扩散通道，从而显著提高循环稳定性和倍率性能。这种Si/CNT复合材料展现出出色的循环性能，在100 mA g下循环100次后，容量保持在912.8 mAh g，在1 A g下循环1000次后，倍率性能优异，容量为650 mAh g。此外，本工作中开发的简便且可扩展的制备方法将使这种新型硅基负极材料在下一代锂离子电池的实际应用中具有广阔前景。
