Tin nanoparticles embedded in porous N-doped graphene-like carbon network as high-performance anode material for lithium-ion batteries
Tin nanoparticles embedded in porous N-doped graphene-like carbon network as high-performance anode material for lithium-ion batteries
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嵌入多孔氮掺杂石墨烯类碳网络中的锡纳米粒子作为锂离子电池的高性能负极材料
DOI：
10.1016/j.jallcom.2016.12.426
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发表时间：
2017-03
影响因子：
6.2
通讯作者：
Deng Yonghong
中科院分区：
文献类型：
--
作者：
Zhou Dan;Song Wei-Li;Li Xiaogang;Fan Li-Zhen;Deng Yonghong
Sn基材料作为可再充电锂离子电池（LIB）的高容量阳极受到特别关注。然而，在实际应用中，由于在重复循环期间的服务体积膨胀而导致的差的稳定性仍然是很大的挑战。本文采用一步热反应法制备了分散性良好的Sn纳米粒子嵌入多孔N掺杂类石墨烯碳网络（Sn@PNGC）中。由于独特的多孔N掺杂类石墨烯碳网络的优点，Sn@PNGC复合物不仅可以避免金属Sn与电解质之间的直接接触，还可以容纳Sn纳米颗粒的聚集和体积膨胀，还可以为Li+插入提供足够的活性位点，并为电子传输提供有利的传输动力学。因此，所制备的Sn@PNGC阳极表现出显著的电化学性能，具有增强的容量、改善的稳定能力和倍率性能，从而在100 mA g-1下100次循环后提供1129 mAh g-1的初始放电容量和595 mAh g-1的高可逆容量，沿着，在500 mA g−1下循环300次后，其额定容量提高到437 mAh g− 1。这种简便的方法证明了LIB先进Sn基阳极材料的低成本和可扩展制造的巨大潜力。
Sn-based materials have received particular attention as high capacity anodes for rechargeable lithium-ion batteries (LIBs). However, poor stability induced by a serve volume expansion during repeated cycling still remains great challenges in practical application. In this paper, well-dispersed Sn nanoparticles embedded in the porous N-doped graphene-like carbon network (Sn@PNGC) were simply fabricated via a one-step thermal reaction. Owing to the advantages of the unique porous N-doped graphene-like carbon network, the Sn@PNGC composite can not only avoid the direct contact between metallic Sn and electrolytes coupled with accommodating the aggregation and volume expansion of Sn nanoparticles, but also provide sufficient active sites for Li+insertion and favorable transport kinetics for electron transport. As a consequence, the as-prepared Sn@PNGC anode suggests remarkable electrochemical performance with enhanced capacity, improved stable ability and rate capability, thus delivering an initial discharge capacity of 1129 mAh g−1and a high reversible capacity of 595 mAh g−1after 100 cycles at 100 mA g−1, along with an enhanced rate capacity of 437 mAh g−1after 300 cycles at 500 mA g−1. The facile approach demonstrates great potential for the low-cost and scalable fabrication of advanced Sn-based anode materials for LIBs.
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