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Low-cost urchin-like silicon-based anode with superior conductivity for lithium storage applications
- Guan, Peng, Zhang, Wei, Li, Chengyu, Han, Na, Wang, Xuechen, Li, Qiaofeng, Song, Guojun, Peng, Zhi, Li, Jianjiang, Zhang, Lei, Zhu, Xiaoyi
- Journal of colloid and interface science 2020 v.575 pp. 150-157
- anodes, carbon nanotubes, lithium, microparticles, silicon, wastes
- Poor rate and cycling performance are the most critical drawbacks for Si-based anodes on account of their inferior conductivity and colossal volumetric expansion during lithiation/delithiation. Here we report the fabrication of structurally-integrated urchin-like Si anode, which provides prominent structural stability and distinguished electron and ion transmission pathways for lithium storage. The inexpensive solid Si waste from organosilane industry after acid-washed and further ball-milling serves as the pristine Si-source in this work. Carbon nanotubes (CNTs) are in-situ grown outside Si microparticles, resulting in an urchin-like structure (Si/CNTs). The optimized Si/CNTs presents ascendant invertible capacity and rate performance, achieving up to 920 mAh g⁻¹ beyond 100 cycles at 100 mA g ⁻¹, and a capacity of 606.2 mAh g⁻¹ at 1 A g ⁻¹ after long cycling for 1000 cycles. The proposed scalable synthesis can be adopted to advance the performance of other electrode materials with inferior conductivity and enormous volume expansions during cycling.