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密封预碳化调节生物质衍生碳的孔隙率和杂原子位用于锂硫电池。

Sealed pre-carbonization to regulate the porosity and heteroatom sites of biomass derived carbons for lithium-sulfur batteries.

机构信息

School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China; Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China.

School of Environment, Henan Normal University, Xinxiang, Henan 453007, PR China; Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China.

出版信息

J Colloid Interface Sci. 2020 Nov 1;579:667-679. doi: 10.1016/j.jcis.2020.06.068. Epub 2020 Jul 1.

Abstract

Ultrathin carbon sheets with high surface area, abundant mesoporous structure and rich N, O heteroatom doping sites were prepared from puffed rice through unique sealed pre-carbonization. By utilizing them as cathode materials for lithium-sulfur batteries, the in-operando Raman spectra and electrochemical tests indicated that the polysulfides shuttling effect could be substantially suppressed by the physical confinement and chemical adsorption due to these structural advantages. In addition, the well-developed hierarchical porous structure and ultrathin thickness were found to enhance the mass diffusion in the electrode, which increased the ion conductivity within the carbon framework. Therefore, the as-designed cathode was observed to accommodate the high sulfur loading amounts and demonstrated a high reversible capacity of 920.8 mAh g after 100 cycles at 0.2C with high coulombic efficiency (~100%). Moreover, the long-term stability test at 1C indicated that the cathode achieved a high reversible capacity of 702.1 mAh g after 300 cycles with low decay rate of 0.07% per cycle.

摘要

通过独特的密封预碳化工艺,从膨化米中制备出具有高比表面积、丰富的中孔结构和丰富的 N、O 杂原子掺杂位的超薄碳片。将其用作锂硫电池的阴极材料,通过原位拉曼光谱和电化学测试表明,由于这些结构优势,多硫化物穿梭效应可以通过物理限制和化学吸附得到显著抑制。此外,发达的分级多孔结构和超薄厚度被发现可以增强电极中的质量扩散,从而提高碳骨架内的离子电导率。因此,所设计的阴极可以容纳高硫载量,并在 0.2C 下经过 100 次循环后表现出 920.8 mAh g 的高可逆容量,且库仑效率(~100%)高。此外,在 1C 下进行的长期稳定性测试表明,该阴极在 300 次循环后仍能达到 702.1 mAh g 的高可逆容量,且每个循环的衰减率低至 0.07%。

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