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2017 | "Ultra-fine SnO2 nanoparticles doubly embedded in amorphous carbon and…

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작성자 관리자 /   작성일2018-02-21 /   조회688회

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Title : Ultra-fine SnO2 nanoparticles doubly embedded in amorphous carbon and reduced graphene oxide (rGO) for superior lithium storage
Authors :Md. Selim Arif Sher Shah, Jooyoung Leeb, A. Reum Park, Youngjin Choi, Woo-Jae Kim, Juhyun Park, Chan-Hwa Chung, Jaeyun Kim, Byungkwon Lim, Pil J. Yoo

Journal : Electrochimica Acta
Vol/No/Page : 224/201-210
DOI : https://doi.org/10.1016/j.electacta.2016.12.049

Abstract :
 SnO2 is a well-studied anode material for lithium ion batteries (LIBs). However, it undergoes severe capacity fading because of a large volume change (ꠑ300%) during cycling. Composites of SnO2 with electro-conductive graphene would deliver improved capacity and rate performance. Nevertheless, achieving the theoretical capacity of SnO2 is still elusive, mainly because of disintegration of the active material from graphene and severe aggregation of SnO2, or Sn nanoparticles produced upon cycling. To surmount these limitations, in this work, nanocomposites containing ultra-fine sized SnO2 nanoparticles (UFSN) with reduced graphene oxide and amorphous carbon were synthesized in a single step at low temperature and environmentally benign way, in which ascorbic acid was employed as the carbon source and reducing agent. UFSN could decrease the lithium ion diffusion path length. As a result of effective buffering effect afforded by the mesoporous structure against volume change and improved lithium ion diffusivity, the ternary nanocomposite achieves ultra-high capacity of 1245 mAh gꠗ1 after 210 cycles at 100 mA gꠗ1 and excellent cycling stability. Since the proposed approach is facile, straightforward, and highly reproducible, it is anticipated that this system would be a potential alternative to the conventional graphite anode for LIBs.

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