The Sn Nano-Particles Coated on MCMB as Anodes Material for Lithium Ion Battery

Abstract:

Sn nano particle coatings on MCMB powder, as anodes of lithium ion battery are carried out in SnSO₄ solutions by using cathodic electrochemical synthesis and subsequently dried at 100°C. The electro-deposition reaction was follow: Sn²⁺ + H2O ↔ SnOH⁺_aq + H⁺; SnOH⁺_aq ↔ SnOH+aqs + e-; SnOH+ads + e- → SnOH; SnOH + H+ + e- → Sn + H₂O. The Sn-coated MCMB specimens are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), and charge/discharge tests. The nano-sized Sn particles coated on MCMB powder are obtained in 0.2M SnSO₄ solutions and desoition current 0.5A. An important parameter in electrode preparation is the adhesion of the coating to the current collector, which greatly affects the cyclability of the electrode. Therefore, the relationship between adhesion strength and cycle performance was investigate in this study. Charge/discharge cycle tests elucidated that Sn-coated MCMB showed higher capacity than MCMB. Compared with MCMB, the second discharge capacity of Sn–coated MCMB increased about 28.8%. After 50 cycles, the reversible capacity was about 339.6 mAhg-1. The capacity retention ratio C25/C2 was about 80.87%. It was shown good cycle life due to the nano-particles effects retarded to Sn aggregation.

• Periodical: Advanced Materials Research (Volumes 622-623)
• Pages: 1000-1005
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.622-623.1000
• Online since: December 2012
• Authors: Min Jen Deng, Du Cheng Tsai, Wen Hsien Ho, Hui Nien Li, Ching Fei Li, Fuh Sheng Shieu
• Keywords: Electrolytic Deposition, High Capacity Anode, Sn-Coated MCMB

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