Rodlike Sb2Se3 Wrapped with Carbon: The Exploring of Electrochemical Properties in Sodium-Ion Batteries
Rodlike Sb2Se3 Wrapped with Carbon: The Exploring of Electrochemical Properties in Sodium-Ion Batteries
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DOI：
10.1021/acsami.7b10886
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发表时间：
2017-10-11
影响因子：
9.5
通讯作者：
Ji, Xiaobo
中科院分区：
文献类型：
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作者：
Ge, Peng;Cao, Xiaoyu;Ji, Xiaobo
通过诱导各向异性自组装制备了一维Sb2Se3/C棒，并对其相应的储钠行为进行了评价，结果表明其具有优异的电化学性能，具有良好的循环稳定性和速率能力。在电流密度为0.2 a g（-1）时，Sb2Se3在2.5到0.01 V之间提供了657.6 mA h g（-1）的高初始充电容量。循环100次后，Sb2Se3/C的可逆容量仍保持在485.2 mA h g（-1）。即使在2.0 a g（-1）的高倍率电流密度下，充电容量仍然保持在311.5 mA h g（-1）。通过循环伏安法和原位电化学阻抗谱的分析，有效地探索了对高速率性能的深入理解。简而言之，得益于一维结构和碳层的引入，Sb2Se3/C的储钠性能得到了明显增强，碳层具有强大的结构稳定性和导电性。
One-dimensional Sb2Se3/C rods are prepared through self-assembly by inducing anisotropy, and their corresponding sodium storage behaviors are evaluated, presenting excellent electrochemical performances with superior cycling stability and rate capability. Sb2Se3 delivers a high initial charge capacity of 657.6 mA h g(-1) at a current density of 0.2 A g(-1) between 2.5 and 0.01 V. After 100 cycles, the reversible capacity of Sb2Se3/C is still retained at 485.2 mA h g(-1). Even at a high rate current density of 2.0 A g(-1), the charge capacity is still retained at 311.5 mA h g(-1). Through the analysis of cyclic voltammetry and in situ electrochemical impedance spectroscopy, the in-depth understanding of high rate performances is explored effectively. Briefly, the sodium storage performance of Sb2Se3/C is observably enhanced, benefiting from the 1D structure and the introduction of a carbon layer with robust structure stability and conductivity.