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A Shell-Shaped Carbon Architecture with High-Loading Capability for Lithium Sulfide Cathodes

机译：具有高承载能力的壳形碳架构，适用于硫化锂阴极。

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摘要

Lithium sulfide (Li2S) is considered a highly attractive cathode for establishing high-energy-density rechargeable batteries, especially due to its high charge-storage capacity and compatibility with lithium-metal-free anodes. Although various approaches have recently been pursued with Li2S to obtain high performance, formidable challenges still remain with cell design (e.g., low Li2S loading, insufficient Li2S content, and an excess electrolyte) to realize high areal, gravimetric, and volumetric capacities. This study demonstrates a shell-shaped carbon architecture for holding pure Li2S, offering innovation in cell-design parameters and gains in electrochemical characteristics. The Li2S core-carbon shell electrode encapsulates the redox products within the conductive shell so as to facilitate facile accessibility to electrons and ions. The fast redox-reaction kinetics enables the cells to attain the highest Li2S loading of 8 mg cm(-2) and the lowest electrolyte/Li2S ratio of 9/1, which is the best cell-design specifications ever reported with Li2S cathodes so far. Benefiting from the excellent cell-design criterion, the core-shell cathodes exhibit stable cyclability from slow to fast cycle rates and, for the first time, simultaneously achieve superior performance metrics with areal, gravimetric, and volumetric capacities.
机译：硫化锂（Li2S）被认为是用于建立高能量密度可充电电池的极具吸引力的阴极，特别是由于其高的电荷存储能力以及与无锂金属阳极的兼容性。尽管最近已对Li2S寻求了各种方法来获得高性能，但是要实现高的面积，重量和体积容量，电池设计仍然面临着巨大的挑战（例如，低Li2S负载，不足的Li2S含量和过量的电解质）。这项研究展示了一种用于容纳纯Li2S的壳形碳结构，为电池设计参数的创新和电化学特性的获得提供了创新。 Li 2 S核-碳壳电极将氧化还原产物封装在导电壳内，以便于电子和离子的便捷访问。快速的氧化还原反应动力学使电池能够达到8 mg cm（-2）的最高Li2S负载量和最低的9/1电解质/ Li2S比，这是迄今为止用Li2S阴极报道的最佳电池设计规格。得益于出色的电池设计标准，核-壳型阴极在从慢速到快速循环速率方面均显示出稳定的循环能力，并且首次同时实现了具有面积，重量和体积容量的出色性能指标。

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