CeO2-webbed carbon nanotubes as a highly efficient sulfur host for lithium-sulfur batteries
CeO2-webbed carbon nanotubes as a highly efficient sulfur host for lithium-sulfur batteries
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DOI：
10.1016/j.ensm.2017.05.015
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发表时间：
2018
影响因子：
20.4
通讯作者：
D. Xiao;Chunxiang Lu;Chengmeng Chen;Shuxia Yuan
中科院分区：
文献类型：
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作者：
D. Xiao;Chunxiang Lu;Chengmeng Chen;Shuxia Yuan
锂硫电池作为下一代可充电电池系统获得了极大的兴趣，因为硫的理论比容量高达1675 mAh g−1。然而，锂硫电池的实际应用仍然受到容量衰减快和循环稳定性差的阻碍。在这项工作中，CeO 2网状碳纳米管（CeO2@CNT）的设计和合成的溶剂热反应，并作为一个概念上的新的硫主机的锂硫电池。在这种独特的结构中，碳纳米管形成三维多孔导电网络，以提供快速的电子路径。此外，纳米CeO 2微晶可以化学结合多硫化物，抑制多硫化物扩散到电解液中。结果，基于该电极材料的锂-硫电池表现出高比容量、上级循环稳定性和良好的倍率性能。在0.1和1C的倍率下分别实现了1359和715 mAh g− 1的可逆比容量，以及在0.5 C下600次循环中每次循环0.07%容量衰减的优异循环稳定性。
The lithium-sulfur batteries have obtained tremendous interest as the next-generation of rechargeable battery systems due to the high theoretical specific capacity of sulfur, 1675 mAh g−1. However, the practical application of lithium-sulfur batteries is still hindered by fast capacity fading and poor cycling stability. In this work, CeO2-webbed carbon nanotubes (CeO2@CNT) is designed and synthesized by solvothermal reaction and used as a conceptually new sulfur host for lithium-sulfur batteries. In this unique architecture, the carbon nanotubes form a three-dimension porous conductive network to provide fast electron paths. In addition, the nanosized CeO2crystallites can chemically bind polysulfides to suppress the polysufides diffusion into electrolyte. As a result, the lithium-sulfur batteries based on this electrode material exhibit high specific capacity, superior cycling stability, and good rate capability. Reversible specific capacities of 1359 and 715 mAh g−1are achieved at rates of 0.1 and 1C, respectively, together with an excellent cycling stability of 0.07% capacity decay per cycle over 600 cycles at 0.5 C.