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Sn-Based Nanocomposite for Li-Ion Battery Anode with High Energy Density, Rate Capability, and Reversibility
ACS Nano ( IF 17.1 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1021/acsnano.8b00586
Min-Gu Park 1, 2 , Dong-Hun Lee 1 , Heechul Jung 3 , Jeong-Hee Choi 4 , Cheol-Min Park 1
Affiliation  

To design an easily manufactured, large energy density, highly reversible, and fast rate-capable Li-ion battery (LIB) anode, Co–Sn intermetallics (CoSn2, CoSn, and Co3Sn2) were synthesized, and their potential as anode materials for LIBs was investigated. Based on their electrochemical performances, CoSn2 was selected, and its C-modified nanocomposite (CoSn2/C) as well as Ti- and C-modified nanocomposite (CoSn2/a-TiC/C) was straightforwardly prepared. Interestingly, the CoSn2, CoSn2/C, and CoSn2/a-TiC/C showed conversion/nonrecombination, conversion/partial recombination, and conversion/full recombination during Li insertion/extraction, respectively, which were thoroughly investigated using ex situ X-ray diffraction and extended X-ray absorption fine structure analyses. As a result of the interesting conversion/full recombination mechanism, the easily manufactured CoSn2/a-TiC/C nanocomposite for the Sn-based Li-ion battery anode showed large energy density (first reversible capacity of 1399 mAh cm–3), high reversibility (first Coulombic efficiency of 83.2%), long cycling behavior (100% capacity retention after 180 cycles), and fast rate capability (appoximately 1110 mAh cm–3 at 3C rate). In addition, degradation/enhancement mechanisms for high-capacity and high-performance Li-alloy-based anode materials for next-generation LIBs were also suggested.

中文翻译:

用于锂离子电池阳极的锡基纳米复合材料,具有高能量密度,速率能力和可逆性

为了设计易于制造的,高能量密度,高度可逆且具有快速速率能力的锂离子电池(LIB)阳极,合成了Co-Sn金属间化合物(CoSn 2,CoSn和Co 3 Sn 2),并且它们的潜力为研究了用于LIB的阳极材料。基于其电化学性能,选择了CoSn 2,并直接制备了其C改性的纳米复合材料(CoSn 2 / C)以及Ti和C改性的纳米复合材料(CoSn 2 / a -TiC / C)。有趣的是,CoSn 2,CoSn 2 / C和CoSn 2 / a-TiC / C分别显示在Li插入/提取过程中的转化/非重组,转化/部分重组和转化/完全重组,并使用异位X射线衍射和扩展的X射线吸收精细结构分析对其进行了深入研究。有趣的转换/完全重组机制的结果是,用于Sn基锂离子电池阳极的易于制造的CoSn 2 / a -TiC / C纳米复合材料显示出大的能量密度(第一可逆容量为1399 mAh cm –3),高可逆性(首次库伦效率为83.2%),长循环行为(180次循环后100%容量保持)和快速速率能力(在3 C下约为1110 mAh cm –3速度)。此外,还提出了用于下一代LIB的高容量,高性能Li合金基负极材料的降解/增强机制。
更新日期:2018-03-05
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