Construction of Rich Conductive Pathways from Bottom to Top: A Highly Efficient Charge-Transfer System Used in Durable Li/Na-Ion Batteries at -20 °C.,Chemistry - A European Journal

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Construction of Rich Conductive Pathways from Bottom to Top: A Highly Efficient Charge-Transfer System Used in Durable Li/Na-Ion Batteries at -20 °C.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-07-01 , DOI: 10.1002/chem.202002317
Yan Xue _{1,

2} , Huanhuan Li ₁ , Yuting Zhang ₁ , Kelei Zhuo ₁ , Guangyue Bai ₁

Affiliation

The construction of potential electrode materials with wide temperature property for high‐energy‐density secondary batteries has attracted great interest in recent years. Herein, a hybrid electrode, consisting of a nitrogen‐doped carbon/α‐MnS/flake graphite composite (α‐MnS@N‐C/FG), is prepared through a post‐sulfurization route. In the α‐MnS@N‐C/FG composite, α‐MnS nanoparticles wrapped by the N−C layer are uniformly embedded onto FG, forming a novel nanofoam structure. The as‐obtained α‐MnS@N‐C/FG shows excellent lithium/sodium storage performance, with a specific capacity of 712 mA h g⁻¹ in the 700th cycle at 1.0 A g⁻¹ or 186.4 mA h g⁻¹ in the 100th cycle at 100 mA g⁻¹ using lithium or sodium foil as the counter electrode, respectively. Moreover, even operated at −20 °C, the α‐MnS@N‐C/FG can still attain a high specific capacity of 350 mA h g⁻¹ after 50 cycles at 100mA g⁻¹ for LIBs. This exceptional electrochemical response is attributed to the synergetic effect of the smart design of a hybrid nanofoam structure, in which the FG skeleton and N‐C coating layer can significantly enhance the conductivity of the whole electrode from bottom to top. Accordingly, the enhanced redox kinetics endow the electrode with pseudocapacitive‐dominated electrochemical behavior, leading to fast electrode reactions and robust structural stability in the whole electrode.

中文翻译：

从底部到顶部的丰富导电路径的构建：高效的电荷传输系统，用于-20°C的耐用锂/钠离子电池。

近年来，用于高能量密度二次电池的具有宽温度特性的电位电极材料的构造引起了人们的极大兴趣。本文所述，混合动力车电极，自由氮掺杂碳/α-的MnS /片状石墨复合材料（α-的MnS @的Ñ -C / FG）中，通过一个后硫化路线制备。在α-的MnS @ Ñ -C / FG复合材料，由包裹α-MnS系纳米颗粒Ñ -C层均匀地嵌入到FG，形成纳米泡沫新颖结构。将如此得到的α-MnS系@ Ñ -C / FG显示出优异的锂/钠存储性能，具有712毫安ħg的比容量^-1在第700个循环，在1.0克^-1或186.4毫安ħ克^-1在第100次循环中，分别使用锂或钠箔作为对电极，电流为100 mA g ^-1。此外，即使在-20℃下操作，α-的MnS @ Ñ -C / FG仍可获得的350毫安ħg的高比容量^-1在100mA克50次循环后^-1为LIBS。这种出色的电化学响应归因于混合纳米泡沫结构智能设计的协同效应，其中FG骨架和N‐C涂层可以从下到上显着提高整个电极的导电性。因此，增强的氧化还原动力学使电极具有伪电容主导的电化学行为，从而导致快速的电极反应和整个电极的稳健结构稳定性。

更新日期：2020-07-01

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