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Mo2C Electrocatalysts for Kinetically Boosting Polysulfide Conversion in Quasi-Solid-State Lithium–Sulfur Batteries
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2021-09-17 , DOI: 10.1021/acsami.1c14629
Yu-Jiao Zhang 1 , Zhen-Yu Xing 2 , Wen-Peng Wang 3 , Ning Gao 1 , Jie Zhao 1 , Wen-Ce Yue 1 , Xue Li 1 , Yi-Bo Gao 1 , Sen Xin 3 , Bao Li 4 , Bao Wang 1
Affiliation  

Lithium–sulfur batteries (LSBs) suffer from sluggish reaction kinetics of sulfur-containing species and loss of soluble polysulfides (PSs) during cycling, especially in the case of liquid electrolytes. Here, we improve the kinetics of sulfur species by decorating Mo2C nanoparticles on carbon nanotubes (CNTs) as the host for sulfur active mass. In addition, by use of gel polymer electrolytes (GPEs) derived from in situ polymerization of 1,3-dioxolane (DOL) to mitigate the diffusion of PSs and improve the stability of Li stripping/plating. As a result, the sulfur cathodes are endowed with enhanced initial specific capacity and suppressed dissolution of sulfur species. The cells with CNT/Mo2C/S cathodes and GPE exhibit excellent electrochemical performance. The anodes cycled with GPE show remarkably enhanced lithium plating-stripping behavior. Benefitting from the synergistic effect, LSBs with higher energy density and improved durability are obtained, demonstrating a new approach for developing high-performance quasi-solid-state Li metal batteries.

中文翻译:

用于促进准固态锂硫电池中多硫化物转化的 Mo2C 电催化剂

锂硫电池(LSBs)在循环过程中受到含硫物质反应动力学缓慢和可溶性多硫化物(PSs)损失的影响,尤其是在液体电解质的情况下。在这里,我们通过在碳纳米管 (CNT) 上装饰 Mo 2 C 纳米粒子作为硫活性物质的主体来改善硫物质的动力学。此外,通过使用源自 1,3-二氧戊环 (DOL) 原位聚合的凝胶聚合物电解质 (GPE) 来减轻 PS 的扩散并提高锂剥离/电镀的稳定性。因此,硫正极具有增强的初始比容量并抑制硫物质的溶解。含 CNT/Mo 2的电池C/S 正极和 GPE 表现出优异的电化学性能。用 GPE 循环的阳极显示出显着增强的锂镀层剥离行为。受益于协同效应,获得了具有更高能量密度和更高耐久性的 LSB,为开发高性能准固态锂金属电池提供了一种新方法。
更新日期:2021-09-29
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