Interface Engineering via Ti(3)C(2)T(x) MXene Electrolyte Additive toward Dendrite-Free Zinc Deposition.
Interface Engineering via Ti(3)C(2)T(x) MXene Electrolyte Additive toward Dendrite-Free Zinc Deposition.
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通过 Ti_3C_2T_x MXene 电解质添加剂实现无枝晶锌沉积的界面工程
DOI：
10.1007/s40820-021-00612-8
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发表时间：
2021-03-08
影响因子：
26.6
通讯作者：
Wang Q
中科院分区：
文献类型：
--
作者：
Sun C;Wu C;Gu X;Wang C;Wang Q
电解质中分散良好的MXene纳米片显著缩短了Zn 2+的扩散路径，并促进了它们的迁移。MXene界面层具有丰富的官能团和良好的导电性，可诱导均匀成核，并实现长期均匀沉积。含MXene的电解液实现了无枝晶的Zn电镀/剥离，具有高库仑效率（99.7%）和上级的可逆性（稳定高达1180次循环）。在线版本包含补充材料，可通过10.1007/s40820-021-00612-8获得。锌金属电池由于其高安全性和低成本而被认为是下一代电池的有希望的候选者。然而，由于金属Zn的枝晶生长导致其循环性能差，严重阻碍了其实际应用。本文中，首先使用Ti 3C 2 Tx MXene作为电解质添加剂，以通过控制Zn的成核和生长过程来促进均匀的Zn沉积。这种MXene添加剂不仅可以吸附在Zn箔上以通过提供丰富的亲锌-O基团来诱导均匀的初始Zn沉积并随后参与形成坚固的固体-电解质界面膜，而且还可以通过降低电极/电解质界面处的Zn 2+浓度梯度来加速离子传输。因此，含MXene的电解液实现了具有高库仑效率（99.7%）和上级的可逆性（稳定地高达1180次循环）的无枝晶Zn电镀/剥离。当应用于全电池时，Zn-V2 O 5电池还提供显著改善的循环性能。本工作为可逆锌金属电池的研制提供了一种简便有效的方法。在线版本包含补充材料，可通过10.1007/s40820-021-00612-8获得。
Well-dispersed MXene nanosheets in the electrolyte dramatically shorten Zn2+ diffusion pathways and facilitate their migration. MXene interfacial layer with abundant functional groups and good conductivity induces uniform nucleation and enables long-term even deposition. MXene-containing electrolyte realizes dendrite-free Zn plating/striping with high Coulombic efficiency (99.7%) and superior reversibility (stably up to 1180 cycles). The online version contains supplementary material available at 10.1007/s40820-021-00612-8. Zinc metal batteries have been considered as a promising candidate for next-generation batteries due to their high safety and low cost. However, their practical applications are severely hampered by the poor cyclability that caused by the undesired dendrite growth of metallic Zn. Herein, Ti3C2Tx MXene was first used as electrolyte additive to facilitate the uniform Zn deposition by controlling the nucleation and growth process of Zn. Such MXene additives can not only be absorbed on Zn foil to induce uniform initial Zn deposition via providing abundant zincophilic-O groups and subsequently participate in the formation of robust solid-electrolyte interface film, but also accelerate ion transportation by reducing the Zn2+ concentration gradient at the electrode/electrolyte interface. Consequently, MXene-containing electrolyte realizes dendrite-free Zn plating/striping with high Coulombic efficiency (99.7%) and superior reversibility (stably up to 1180 cycles). When applied in full cell, the Zn-V2O5 cell also delivers significantly improved cycling performances. This work provides a facile yet effective method for developing reversible zinc metal batteries. The online version contains supplementary material available at 10.1007/s40820-021-00612-8.
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