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Suppressing Redox Shuttle with MXene-Modified Separators for Li–O2 Batteries

机译:用Li-O2电池用MXENE改性分离器抑制氧化还原梭式

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摘要

Redox mediators (RMs) have been developed as efficient approaches to lower the charge polarization of Li–O_(2) batteries. However, the shuttle effect resulting from their soluble nature severely damages the battery performance, causing failure of the RM and anode corrosion. In this work, a chemical binding strategy based on a MXene-modified separator with a 3D porous hierarchical structure design was developed to suppress the I_(3)~(–) shutting in LiI-involved Li–O_(2) battery. As corroborated by experimental characterizations and theoretical calculations, the abundant ?OH terminal groups on the MXene surface functioned as effective binding sites for suppressing the migration of I_(3)~(–), while the 3D porous structure ensured the fast transfer of lithium ions. As a result, the Li–O_(2) battery with the MXene-modified separator showed no sign of redox shuttling compared with its counterparts in the full discharge/charge tests. In the meantime, the MXene-modified separator based-cell exhibited a stable cycle life up to 100 cycles, which is 3 times longer than the control samples. We believe that this work could provide insights into the development of separator modification for Li–O_(2) batteries with RMs.
机译:氧化还原介质(RMs)是降低锂氧电池充电极化的有效方法。然而,由其可溶性质产生的穿梭效应严重损害了电池性能,导致RM失效和阳极腐蚀。在这项工作中,我们开发了一种基于MXene改性分离器的化学结合策略,该分离器采用三维多孔分层结构设计,以抑制锂离子电池中的I_3~(-)关闭。正如实验表征和理论计算所证实的,丰富的?MXene表面的OH端基是抑制I_3~(-)迁移的有效结合位点,而三维多孔结构保证了锂离子的快速转移。因此,与完全放电/充电测试中的锂氧电池相比,带有MXene改性分离器的锂氧电池没有显示出氧化还原穿梭的迹象。同时,MXene改性分离器基电池的稳定循环寿命高达100次,是对照样品的3倍。我们相信,这项工作可以为具有RMs的Li–O_2电池隔膜改进的发展提供见解。

著录项

  • 来源
    《ACS applied materials & interfaces》 |2021年第26期|共10页
  • 作者单位

    CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Science;

    CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Science;

    CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Science;

    CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Science;

    CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Science;

    CAS Key Laboratory of Materials for Energy Conversion Shanghai Institute of Ceramics Chinese Academy of Science;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    Li?Olt; subgt; 2lt; /subgt; batteries; redox mediator; shuttle effect; chemical binding; MXene; separator modification;

    机译:锂?O;sub;2/sub;电池;氧化还原介质;穿梭效应;化学结合;MXene;分离器改造;
  • 入库时间 2022-08-20 20:23:41

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