Electrochemical characteristics of nc-Si/SiC composite for anode electrode of lithium ion batteries

• Published in: Journal of alloys and compounds 2014-03, Vol.590, p.254-259
• Main Authors: Jeon, Bup Ju, Lee, Joong Kee
• Format: Article
• Language: English
• Subjects: Active control; Anodes; Carbon; Chemistry; Crystal structure; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Lithium ion secondary batteries; Lithium-ion batteries; Nano scaled silicon; nc-Si/SiC composite; Particulate composites; Phases; Plasma torch; Silicon carbide
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.12.122

Cycling performances and coulombic efficiencies of the nc-Si/SiC composite anodes at different CH4/SiH4 mole ratios. •Our work has focused on irreversible discharge capacity and capacity retention of nc-Si/SiC composite particles.•Particles comprised a mixed construction of nc-Si/SiC structure with dual phases.•The SiC phase acted as retarding media, leading to enhanced cycle stability. nc-Si/SiC composite particles were prepared as an anode material for lithium ion batteries using a plasma jet with DC arc discharge. The composition of the nc-Si/SiC composite particles was controlled by setting the mole ratio of CH4 and SiH4 precursor gases. X-ray diffraction, TEM images, and Raman shift analyses revealed that the synthesized nc-Si/SiC composite particles comprised a construction of nano-nocaled structure with crystalline phases of active silicon, highly disordered amorphous carbon of graphite and crystalline phases of β-SiC. In the experimental range examined, the nc-Si/SiC composite particles showed good coulombic efficiency in comparison with particles high Si–Si bonding content due to the interplay of particles with a small proportion of carbon and the buffering effect against volume expansion by structural stabilization, and played a role as retarding media for the rapid electrochemical reactions of the SiC crystal against lithium.