Core/shell FeSe/Carbon Nanosheet-Assembled Microflowers with Ultrahigh Coulombic-Efficiency and Rate Performance as Nonpresodiate Anode for Sodium-ion Battery
Core/shell FeSe/Carbon Nanosheet-Assembled Microflowers with Ultrahigh Coulombic-Efficiency and Rate Performance as Nonpresodiate Anode for Sodium-ion Battery
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具有超高库仑效率和倍率性能的核/壳 FeSe/碳纳米片组装微花作为钠离子电池非预钠负极
DOI：
10.1016/j.carbon.2020.05.001
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发表时间：
2020-09
期刊：
影响因子：
10.9
通讯作者：
Zhou Jisheng
中科院分区：
文献类型：
--
作者：
Xiong Zhao;Sun Di;ing;Jia Xiaolong;Zhou Jisheng
基于碳约束定向附着机制，合成了由二维核/壳FeSe/碳纳米片构成的微花状复合材料。这种独特的结构可以有效地增强钠离子扩散动力学，加速电子传递，抑制FeSe晶核的体积膨胀。当用作钠离子电池负极材料时，该复合材料可提供460.2 mA/h的高容量和99.8%的超高初始库仑效率(−1)。此外，该复合材料还具有优异的倍率性能和超长循环稳定性。在5和10A/−时，容量分别高达343.8和341.3 mA/g−1。在30A/g−1的超高电流密度下，复合材料仍可提供183.8 mA/g−1的容量，并在10000次循环后保持约100 mA/h/−1的值。有趣的是，复合材料可以直接与Na3V2(PO4)3组装成全电池，而不需要预设条件。全电池在140次循环后的容量为214.6毫安/因此，这项工作对非预置阳极材料的设计具有重要意义，从而促进了SIBs的实际应用。
The microflower-like composites, constructed by two-dimensional core/shell FeSe/carbon nanosheet, are synthesized based on carbon-confined oriented-attachment mechanism. This unique structure can effectively enhance sodium-ion diffusion kinetics, accelerate the electron transfer and inhibit the volume expansion of FeSe kernel. When used as anode materials of sodium ion batteries (SIBs), the composites can deliver a high capacity of 460.2 mA h g−1with ultrahigh initial Coulombic efficiency (ICE) of 99.8%. Moreover, the composites exhibit excellent rate-performance and super-long cycling stability. The capacity can be as high as 343.8 and 341.3 mA h g−1at 5 and 10 A g−1. At ultrahigh current density of 30 A g−1, the composites can still deliver a capacity of 183.8 mA h g−1and maintain a value of ca. 100 mA h g−1after 10000 cycles. Interestingly, the composites can be directly assembled with Na3V2(PO4)3into full battery without presodiation. The full battery delivers a capacity of 214.6 mA h g−1after 140 cycles with a retention of 99.9% at 1 A g−1, showing superior rate and cyclic performances. Accordingly, this work is of great significant for design of non-presodiate anode materials to promote the practical applications of SIBs.
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