Ultra-fine SnO2 nanoparticles doubly embedded in amorphous carbon and reduced graphene oxide (rGO) for superior lithium storage
Ultra-fine SnO2 nanoparticles doubly embedded in amorphous carbon and reduced graphene oxide (rGO) for superior lithium storage
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DOI：
10.1016/j.electacta.2016.12.049
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发表时间：
2017-01
影响因子：
6.6
通讯作者：
Md. Selim Arif Sher Shah;Jooyoung Lee;A. Park;Y. Choi;Woo-Jae Kim;Juhyun Park;C. Chung;Jaeyun Kim;Byungkwon Lim;P. Yoo
中科院分区：
文献类型：
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作者：
Md. Selim Arif Sher Shah;Jooyoung Lee;A. Park;Y. Choi;Woo-Jae Kim;Juhyun Park;C. Chung;Jaeyun Kim;Byungkwon Lim;P. Yoo
SnO2是目前研究较多的锂离子电池负极材料。然而，由于在循环过程中体积变化很大(∼300%)，它经历了严重的容量衰落。SnO2与导电石墨烯的复合材料将提供更高的容量和倍率性能。然而，要达到SnO2的理论容量仍然是难以实现的，主要是因为石墨烯中的活性物质分解，以及循环过程中产生的SnO2或锡纳米颗粒的严重聚集。为了克服这些局限性，本工作以抗坏血酸为碳源和还原剂，在低温、环境友好的条件下，一步合成了氧化石墨烯还原的超细SnO2纳米颗粒(UFSN)和无定形碳。UFSN可以缩短锂离子的扩散路径长度。由于介孔结构对体积变化的有效缓冲作用和锂离子扩散率的改善，三元纳米复合材料在100mA−1下210次循环后的超高容量达到1245mAhg−1，并且具有良好的循环稳定性。由于该方法简单、直接、重现性好，有望成为传统石墨阳极的潜在替代品。
SnO2is a well-studied anode material for lithium ion batteries (LIBs). However, it undergoes severe capacity fading because of a large volume change (∼300%) during cycling. Composites of SnO2with electro-conductive graphene would deliver improved capacity and rate performance. Nevertheless, achieving the theoretical capacity of SnO2is 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 SnO2nanoparticles (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 g−1after 210 cycles at 100 mA g−1and 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.