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Core–Shell Co, Zn Bimetallic Selenide Embedded Nitrogen-Doped Carbon Polyhedral Frameworks Assist in Sodium-Ion Battery Ultralong Cycle
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-05-20 , DOI: 10.1021/acssuschemeng.0c02521 Zheng Zhang 1 , Ying Huang 1 , Xudong Liu 1 , Xin Wang 1 , Panbo Liu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-05-20 , DOI: 10.1021/acssuschemeng.0c02521 Zheng Zhang 1 , Ying Huang 1 , Xudong Liu 1 , Xin Wang 1 , Panbo Liu 1
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Sodium-ion batteries (SIBs) have become the best alternative to lithium-ion batteries. However, it is difficult to meet the efficiency of SIBs using graphite. Transition-metal selenides are expected to be ideal anode materials for SIBs, but some problems still need to be solved, such as poor conductivity and volume expansion. Here, we successfully synthesized a core–shell structure ZnSe@CoSe2/NC composite using ZIF-8@ZIF-67 as a precursor. The in situ decorated ZnSe and CoSe2 nanoparticles on the NC polyhedral framework provide a rich active site for the entire electrode. In addition, the NC can simultaneously increase the conductivity and alleviate the volume effect generated during the cycling process. The ZnSe@CoSe2/NC composites exhibit excellent electrochemical performance when used in SIB anode materials. When the current density is 0.1 A g–1, the reversible capacity is 499.1 mA h g–1 after 100 cycles. When the current density is increased to 1.0 A g–1, a reversible capacity of 273.5 mA h g–1 after 4000 cycles is delivered. In addition, the ZnSe@CoSe2/NC composite also exhibits superior rate performance. The sodium reaction kinetics of the ZnSe@CoSe2/NC composite was analyzed to explain its outstanding electrochemical performance. These results reveal the enormous potential of ZnSe@CoSe2/NC composites in building efficient SIBs.
中文翻译：
核-壳公司，Zn双金属硒化物嵌入的氮掺杂碳多面体骨架有助于钠离子电池超长循环
钠离子电池（SIB）已成为锂离子电池的最佳替代品。然而，难以满足使用石墨的SIB的效率。过渡金属硒化物有望成为SIB的理想阳极材料，但仍需要解决一些问题，例如差的电导率和体积膨胀。在这里，我们以ZIF-8 @ ZIF-67为前体成功合成了核-壳结构ZnSe @ CoSe 2 / NC复合材料。NC多面体框架上原位装饰的ZnSe和CoSe 2纳米粒子为整个电极提供了丰富的活性位点。另外，NC可以同时增加电导率并减轻循环过程中产生的体积效应。ZnSe @ CoSe 2/ NC复合材料在SIB阳极材料中使用时表现出出色的电化学性能。当电流密度为0.1 A g –1时，经过100个循环后，可逆容量为499.1 mA hg –1。当电流密度增加到1.0 A g –1时，在4000次循环后，可逆容量为273.5 mA hg –1。此外，ZnSe @ CoSe 2 / NC复合材料还显示出优异的倍率性能。分析了ZnSe @ CoSe 2 / NC复合材料的钠反应动力学，以解释其出色的电化学性能。这些结果揭示了ZnSe @ CoSe 2 / NC复合材料在构建高效SIB中的巨大潜力。
更新日期：2020-05-20
中文翻译：
核-壳公司，Zn双金属硒化物嵌入的氮掺杂碳多面体骨架有助于钠离子电池超长循环
钠离子电池（SIB）已成为锂离子电池的最佳替代品。然而，难以满足使用石墨的SIB的效率。过渡金属硒化物有望成为SIB的理想阳极材料，但仍需要解决一些问题，例如差的电导率和体积膨胀。在这里，我们以ZIF-8 @ ZIF-67为前体成功合成了核-壳结构ZnSe @ CoSe 2 / NC复合材料。NC多面体框架上原位装饰的ZnSe和CoSe 2纳米粒子为整个电极提供了丰富的活性位点。另外，NC可以同时增加电导率并减轻循环过程中产生的体积效应。ZnSe @ CoSe 2/ NC复合材料在SIB阳极材料中使用时表现出出色的电化学性能。当电流密度为0.1 A g –1时，经过100个循环后，可逆容量为499.1 mA hg –1。当电流密度增加到1.0 A g –1时，在4000次循环后，可逆容量为273.5 mA hg –1。此外，ZnSe @ CoSe 2 / NC复合材料还显示出优异的倍率性能。分析了ZnSe @ CoSe 2 / NC复合材料的钠反应动力学，以解释其出色的电化学性能。这些结果揭示了ZnSe @ CoSe 2 / NC复合材料在构建高效SIB中的巨大潜力。
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