Convertibility of Anode Electrode with Microsized Wafer Scraps via Carbon Veil with Plasma Technique

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• 作者：Bing-Hong Chen ; Shang-I Chuang ; Jenq-Gong Duh
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：February 6, 2017
• 年：2017
• 卷：5
• 期：2
• 页码：1784-1793
• 全文大小：1000K
• ISSN：2168-0485

文摘

Low-cost and micrometer-sized silicon cutting scraps were extracted as an anode material within recycled silicon/silicon carbide (Si/SiC) composites (RSCs) for lithium ion batteries (LIBs). A particular approach, carbon veil (C-veil), was unprecedentedly casted onto the surface of electrode and a further combination with plasma treatment was involved to convert the surface status. Both C-veil and plasma-enhanced C-veil (PEC-veil) improved the RSCs-based electrode with more stable capacity retention and higher Coulombic efficiency. Measurements of electrochemical impedance spectra show that the surface modifications reduced the resistance of solid electrolyte interphase (SEI) and resistance of charge transfer, indicating that both C-veil and PEC-veil own the effects of stabilizing formation of solid electrolyte interphases and lower barriers for lithium ion transportation. Furthermore, the expansion thickness of electrode after first cycle gradually reduced, and the surface morphology of SEI changed from cracked pieces to a smooth surface with the integrated treatment. Overall, a simple but distinct C-veil demonstrated a new breakthrough for Si-based anode by C-veil-based surface modification, which also mutates the useless scraps as a potential candidate for LIBs.