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Urchin-Like Fe3 Se4 Hierarchitectures: A Novel Pseudocapacitive Sodium-Ion Storage Anode with Prominent Rate and Cycling Properties.
Small ( IF 13.0 ) Pub Date : 2020-06-08 , DOI: 10.1002/smll.202000504 Jian Zhang 1 , Yongchang Liu 1, 2 , Hui Liu 1 , Yuzhu Song 1 , Shengdong Sun 1 , Qiang Li 1 , Xianran Xing 1 , Jun Chen 1
Small ( IF 13.0 ) Pub Date : 2020-06-08 , DOI: 10.1002/smll.202000504 Jian Zhang 1 , Yongchang Liu 1, 2 , Hui Liu 1 , Yuzhu Song 1 , Shengdong Sun 1 , Qiang Li 1 , Xianran Xing 1 , Jun Chen 1
Affiliation
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Transition metal chalcogenides have received great attention as promising anode candidates for sodium‐ion batteries (SIBs). However, the undesirable cyclic life and inferior rate capability still restrict their practical applications. The design of micro–nano hierarchitectures is considered as a possible strategy to facilitate the electrochemical reaction kinetics and strengthen the electrode structure stability upon repeated Na+ insertion/extraction. Herein, urchin‐like Fe3Se4 hierarchitectures are successfully prepared and developed as a novel anode material for SIBs. Impressively, the as‐prepared urchin‐like Fe3Se4 can present an ultrahigh rate capacity of 200.2 mAh g‐1 at 30 A g‐1 and a prominent capacity retention of 99.9% over 1000 cycles at 1 A g‐1, meanwhile, a respectable initial coulombic efficiency of ≈100% is achieved. Through the conjunct study of in situ X‐ray diffraction, ex situ X‐ray absorption near‐edge structure spectroscopy, as well as cyclic voltammetry curves, it is intriguing to reveal that the phase transformation from monoclinic to amorphous structure accompanied by the pseudocapacitive Na+ storage behavior accounts for the superior electrochemical performance. When paired with the Na3V2(PO4)3 cathode materials, the assembled full cell enables high energy density and decent cyclic stability, demonstrating potential practical feasibility of the present urchin‐like Fe3Se4 anode.
中文翻译：
Urchin样的Fe3 Se4层次结构：一种新颖的伪电容式钠离子存储阳极，具有显着的速率和循环特性。
过渡金属硫族化物作为钠离子电池（SIB）的有希望的阳极候选物已受到广泛关注。但是，不良的循环寿命和差的速率能力仍然限制了它们的实际应用。微纳米层级结构的设计被认为是促进电化学反应动力学并在重复的Na +插入/萃取过程中增强电极结构稳定性的可能策略。在此，成功制备并开发了类似顽童的Fe 3 Se 4层状结构，并将其开发为SIB的新型阳极材料。令人印象深刻的是，所制备的类似Urchin的Fe 3 Se 4在30 A g时具有200.2 mAh g -1的超高倍率容量‐1，在1 A g ‐1的1000个循环中，显着的容量保持率达到99.9％，同时，达到了可观的初始库仑效率≈100％。通过对原位X射线衍射，非原位X射线吸收近边缘结构光谱以及循环伏安曲线的联合研究，令人感兴趣的是，揭示了从单斜晶到非晶结构的相变，并伴有伪电容性Na。+存储行为说明了优异的电化学性能。与Na 3 V 2（PO 4）3配对时阴极材料，组装好的全电池可实现高能量密度和良好的循环稳定性，证明了目前这种类似Urchin的Fe 3 Se 4阳极的潜在实用可行性。
更新日期：2020-07-02
中文翻译：
Urchin样的Fe3 Se4层次结构：一种新颖的伪电容式钠离子存储阳极，具有显着的速率和循环特性。
过渡金属硫族化物作为钠离子电池（SIB）的有希望的阳极候选物已受到广泛关注。但是，不良的循环寿命和差的速率能力仍然限制了它们的实际应用。微纳米层级结构的设计被认为是促进电化学反应动力学并在重复的Na +插入/萃取过程中增强电极结构稳定性的可能策略。在此，成功制备并开发了类似顽童的Fe 3 Se 4层状结构，并将其开发为SIB的新型阳极材料。令人印象深刻的是，所制备的类似Urchin的Fe 3 Se 4在30 A g时具有200.2 mAh g -1的超高倍率容量‐1，在1 A g ‐1的1000个循环中，显着的容量保持率达到99.9％，同时，达到了可观的初始库仑效率≈100％。通过对原位X射线衍射，非原位X射线吸收近边缘结构光谱以及循环伏安曲线的联合研究，令人感兴趣的是，揭示了从单斜晶到非晶结构的相变，并伴有伪电容性Na。+存储行为说明了优异的电化学性能。与Na 3 V 2（PO 4）3配对时阴极材料，组装好的全电池可实现高能量密度和良好的循环稳定性，证明了目前这种类似Urchin的Fe 3 Se 4阳极的潜在实用可行性。
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