In this work, nonstoichiometric Cu_2–xSe fabricated by a facile water evaporation process is used as high-performance Al-ion battery cathode materials. Cu_2–xSe electrodes show high reversible capacity and excellent cycling stability, even at a high current density of 200 mA g^–1, the specific charge capacity in the initial cycle is 241 mA h g^–1 and maintains 100 mA h g^–1 after 100 cycles with a Coulombic efficiency of 96.1%, showing good capacity retention. The prominent kinetics of Cu_2–xSe electrodes is also revealed by the GITT, which is attributed to the ultrahigh electronic conductivity of the Cu_2–xSe material. Most importantly, an extensive research is dedicated to investigating the detailed intercalation and de-intercalation of relatively large chloroaluminate anions into the cubic Cu_2–xSe, which is conducive to better understand the reaction mechanism of the Al/Cu_2–xSe battery.

中文翻译：

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一维Cu ₂ – _x Se纳米棒作为高性能铝离子电池的阴极材料

在这项工作中，通过简便的水蒸发工艺制造的非化学计量Cu _{2– x} Se被用作高性能的Al离子电池正极材料。Cu _{2– x} Se电极显示出高可逆容量和出色的循环稳定性，即使在200 mA g ^–1的高电流密度下，初始循环中的比充电容量为241 mA hg ^–1，并在之后保持100 mA hg ^–1 100个循环，库仑效率为96.1％，显示出良好的容量保持率。GITT还揭示了Cu _{2– x} Se电极的突出动力学，这归因于Cu _{2– x}的超高电导率硒材料。最重要的是，一项广泛的研究致力于调查相对较大的氯铝酸盐阴离子到立方Cu _{2– x} Se中的详细嵌入和去嵌入，这有助于更好地了解Al / Cu _{2– x} Se电池的反应机理。。