Diamine molecules double lock-link structured graphene oxide sheets for high-performance sodium ions storage
Diamine molecules double lock-link structured graphene oxide sheets for high-performance sodium ions storage
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DOI：
10.1016/j.ensm.2020.08.021
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发表时间：
2021
影响因子：
20.4
通讯作者：
Yu-Shan Zhang;Bin-Mei Zhang;Yu-xia Hu;Jun Li;Chunshan Lu;Mingjin Liu;Kuang-ye Wang;L. Kong
中科院分区：
文献类型：
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作者：
Yu-Shan Zhang;Bin-Mei Zhang;Yu-xia Hu;Jun Li;Chunshan Lu;Mingjin Liu;Kuang-ye Wang;L. Kong
石墨因其来源丰富、成本低、导电性好等优点而被广泛应用于锂离子电池材料，但石墨层间距小，限制了其在钠离子插入/提取方面的应用。本文通过脱水缩合反应证明了一种新兴且有效的方法——在氧化石墨烯（GO）薄片之间锁住链状H2N(CH2) xnh2，以扩大石墨烯的层间间距，增强层状结构的稳定性。得到的H2N(CH2)xNH2可连接氧化石墨烯（xDM-GO），呈现锁链结构，导致层间间距扩大，具有优异的Na+存储性能，在0.1 ag−1电流密度下具有158.1 mAh g−1的高比放电容量，在1a g−1电流密度下具有82.2%的容量保持率。研究了层间距对Na+扩散系数和速率能力的影响，其中0.95 nm为Na+插入/提取的最佳层间距。该策略有效地调节了氧化石墨烯的层间距，提高了氧化石墨烯的结构稳定性，从而获得了最佳的Na+插入/提取性能和优异的Na+存储性能。
Graphite has been commercialized as a material of lithium ions batteries because of its abundant source, low cost and excellent conductivity while the small interlayer spacing of graphite limits its application for Na+insertion/extraction. Herein, an emerging and effective approach—chain-like H2N(CH2)xNH2locked between graphene oxide (GO) sheets to expand the interlayer spacing of graphene with enhanced stability of layered structure was demonstrated by a dehydration condensation reaction. The as-obtained H2N(CH2)xNH2, which can link GO (xDM-GO), exhibits a lock-link structure, resulting in expanded interlayer spacing, with which the excellent Na+storage performance with a high specific discharge capacity of 158.1 mAh g−1at 0.1 A g−1and outstanding capacity retention of 82.2% at a current density of 1 A g−1can be achieved. The effects of interlayer spacing on Na+diffusion coefficient and the rate capability were investigated, for which 0.95 nm is the most suitable interlayer spacing for the Na+insertion/extraction. The novel strategy demonstrates an effective way to controllably tune the interlayer spacing with the improved structure stability of GO, resulting in the best Na+insertion/extraction behavior with the excellent Na+storage performance.