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Highly Zn2+-conductive and robust modified montmorillonite protective layer of electrodes toward high-performance rechargeable zinc-ion batteries
Energy Storage Materials ( IF 18.9 ) Pub Date : 2022-06-17 , DOI: 10.1016/j.ensm.2022.06.029
Yong Wang , Yunmiao Fan , Dan Liao , Yiyu Wu , Yang Yu , Chaoquan Hu

The corrosion, parasitic side-reaction and dendrite of Zn anode as well as the dissolution of MnO2 cathode limit the commercial application of zinc-ion batteries (ZIBs). Herein, a novel coating layer on Zn anode and MnO2 cathode of rechargeable ZIBs is rationally designed by mixing hexadecyl trimethyl ammonium bromide(CTAB)-pillared organic montmorillonite with ZnSO4/MnSO4 solution (ZnOMMT). ZnOMMT can serve as the protective layer to alleviate Zn corrosion and MnO2 dissolution while the unique interlayer structure of ZnOMMT can also offer a selective pathway for fast Zn2+ transfer and uniform Zn2+ diffusion to inhibit the side-reaction and Zn dendrite generation. Notably, by the powerful pillaring of CTAB cations, the expanded and robust nanoscale interlayer tunnels of ZnOMMT for Zn2+ diffusion are constructed to guarantee outstanding ionic conductivity (6.52 mS cm−1), high Zn2+ transference number (t+=0.66) and outstanding cyclic stability during deep cycles. Therefore, ZIBs with ZnOMMT coating layer deliver a steady long-term reversible capacity (267 mAh g−1 until 300 cycles at 0.5 A g−1, 205 mAh g−1 until 700 cycles at 1.0 A g−1). The rational design of CTAB-pillared montmorillonite protective layer brings a brand-new opportunity to the realization of high-performance rechargeable ZIBs.



中文翻译:

用于高性能可充电锌离子电池的高 Zn2+ 导电和坚固的改性蒙脱石电极保护层

锌负极的腐蚀、寄生副反应和枝晶以及MnO 2正极的溶解限制了锌离子电池(ZIBs)的商业应用。在此,通过将十六烷基三甲基溴化铵(CTAB)柱柱有机蒙脱土与ZnSO 4 /MnSO 4溶液(ZnOMMT)混合,合理设计了可充电ZIBs的Zn阳极和MnO 2阴极上的新型涂层。ZnOMMT 可以作为保护层来缓解 Zn 腐蚀和 MnO 2溶解,而 ZnOMMT 独特的层间结构还可以为快速 Zn 2+转移和均匀 Zn 2+提供选择性途径扩散以抑制副反应和锌枝晶的生成。值得注意的是,通过CTAB阳离子的强大支柱,ZnOMMT的扩展和坚固的纳米级层间隧道用于Zn 2+扩散,以保证出色的离子电导率(6.52 mS cm -1),高Zn 2+迁移数(t + =0.66 ) 和在深循环期间出色的循环稳定性。因此,具有 ZnOMMT 涂层的 ZIB 可提供稳定的长期可逆容量(267 mAh g -1在 0.5 A g -1下循环 300 次,在 1.0 A g -1下循环205 mAh g -1直到 700 次))。CTAB柱蒙脱石保护层的合理设计为高性能可充电ZIBs的实现带来了全新的机遇。

更新日期:2022-06-17
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