Abstract Dual-ion batteries (DIBs) suffer potential matching problem of anode and cathode, which originates from the contrasting size difference between the corresponding small metal cations and large polyatomic anions from metallic salt solution electrolyte. With wide voltage window and high stability, ionic liquid (IL) can provide larger cations occupying similar radius with anions, which can be a facile solution for unbalanced match of both electrodes. Thus, searching for electrode materials with large interlayer space for IL is in a great demand. MXene, a 2D transition metal nitride or carbide with high conductivity, provides large layer distance to accommodate large ions of ILs. The electrochemical intercalation behavior of EMIm+ cations and MXene has been investigated and a delicate design of an IL-based DIB is proposed. On the basis of size match on both anode and cathode, the DIB also shows promising energy-power characteristic and excellent cycling stability.

中文翻译：

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MXene 作为可耐受双离子电池中大离子的负极材料

摘要 双离子电池（DIBs）存在正负极电位匹配问题，这源于金属盐溶液电解质中相应的小金属阳离子和大多原子阴离子之间的对比尺寸差异。离子液体 (IL) 具有宽电压窗口和高稳定性，可以提供与阴离子占据相似半径的更大阳离子，这可以轻松解决两个电极的不平衡匹配。因此，寻找具有大层间空间的 IL 电极材料的需求很大。MXene 是一种具有高导电性的二维过渡金属氮化物或碳化物，可提供较大的层距以容纳大离子离子。已经研究了 EMIm+ 阳离子和 MXene 的电化学嵌入行为，并提出了基于 IL 的 DIB 的精细设计。