Pseudocapacitance-boosted ultrafast Na storage in a pie-like FeS@C nanohybrid as an advanced anode material for sodium-ion full batteries†,Nanoscale

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Pseudocapacitance-boosted ultrafast Na storage in a pie-like FeS@C nanohybrid as an advanced anode material for sodium-ion full batteries†
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-12 00:00:00 , DOI: 10.1039/c7nr09674g
Bao-Hua Hou _{1,

2,

3,

4,

5} , Ying-Ying Wang _{1,

2,

3,

4,

5} , Jin-Zhi Guo _{1,

2,

3,

4,

5} , Qiu-Li Ning _{1,

2,

3,

4,

5} , Xiao-Tong Xi _{1,

2,

3,

4,

5} , Wei-Lin Pang _{1,

2,

3,

4,

5} , An-Min Cao _{6,

7,

8,

9,

10} , Xinlong Wang _{1,

2,

3,

4,

5} , Jing-Ping Zhang _{1,

2,

3,

4,

5} , Xing-Long Wu _{1,

2,

3,

4,

5}

Affiliation

In order to develop promising anode materials for sodium-ion batteries (SIBs), a novel pie-like FeS@C (P-FeS@C) nanohybrid, in which all ultrasmall FeS nanocrystals (NCs) are completely embedded into the carbon network and sealed by a protective carbon shell, has been prepared. The unique pie-like structure can effectively speed up the kinetics of electrode reactions, while the carbon shell stabilizes the FeS NCs inside. Studies show that the electrochemical reaction processes of P-FeS@C electrodes are dominated by the pseudocapacitive behavior, leading to an ultrafast Na⁺-insertion/extraction reaction. Hence, the prepared P-FeS@C nanohybrid exhibits superior Na-storage properties especially high rate capability in half cells. For example, it can deliver reversible capacities of 555.1 mA h g⁻¹ at 0.2 A g⁻¹ over 150 cycles and about 60.4 mA h g⁻¹ at 80 A g⁻¹ (an ultrahigh current density even higher than that of the capacitor test). Furthermore, an advanced P-FeS@C//Na₃V₂(PO₄)₂O₂F full cell has been assembled out, which delivers a stable specific capacity of 441.2 mA h g⁻¹ after 80 cycles at 0.5 A g⁻¹ with a capacity retention of 91.8%.

中文翻译：

伪电容增强的超快Na储存在类似饼状的FeS @ C纳米杂化物中，作为钠离子充满电池的高级阳极材料†

为了开发用于钠离子电池（SIB）的有前途的负极材料，一种新型的饼状FeS @ C（P-FeS @ C）纳米杂化物，其中所有超小FeS纳米晶体（NC）都完全嵌入碳网络中，并且已经准备好通过保护性碳壳密封。独特的饼状结构可有效加快电极反应的动力学，而碳壳可稳定内部的FeS NC。研究表明，P-FeS @ C电极的电化学反应过程受拟电容行为的支配，从而导致超快的Na ⁺插入/萃取反应。因此，制备的P-FeS @ C纳米杂化物表现出优异的Na储存性能，特别是在半电池中具有高倍率能力。例如，它可以提供555.1 mA hg ^-1的可逆容量在0.2 A克^-1超过150个循环和大约60.4毫安汞柱^-1在80 A G ^-1（超高电流密度甚至高于电容器测试的）。此外，一种先进的P-的FeS @ C_ //的Na ₃ V ₂（PO ₄）₂ ö ₂ F完全细胞已经被组装出，它提供了441.2毫安Hg的稳定比容量^-1在0.5 A克80次循环后^{- 1个}，容量保持率达到91.8％。

更新日期：2018-04-12

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