Cathode materials play a crucial role in the energy-storage performances of zinc ion battery (ZIB). In this paper, the two-dimensional vanadium carbide MXene (VC-MXene) nanoplates intercalated by CuVO(OH)·2 HO (CuVO) are synthesized. The intercalation of CuVO in the interlayers of VC-MXene overcomes self-aggregation of CuVO and improves its structural stability. Meanwhile, the enlarged interlayer spacing of highly conductive VC-MXene upgrades the electron transfer within the composite. As the cathode electrode of ZIB, the CuVO intercalated VC-MXene (CuVO@VC-MXene) battery shows capacity as high as 551.8 mAh g when discharged at 0.5 A g. The capacity retention rate reaches 91.8% after 3000 cycles at high current density of 6.0 A g. As a comparison, the CuVO//Zn battery has capacity only 193.3 mAh g at 0.5 A g, with the capacity retention of just 43.1% after 3000 cycles at 6.0 A g. Simultaneously, the CuVO@VC-MXene//Zn illustrates greatly improved rate capability compared with CuVO//Zn. The CuVO@VC-MXene composite nanoplates in this work show promise in fabrication of high capacity metal ion batteries.

中文翻译：

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二维钒酸铜插层碳化钒MXene纳米板作为水系锌离子电池的高性能阴极

正极材料对锌离子电池（ZIB）的储能性能起着至关重要的作用。本文合成了 CuVO(OH)·2 H2O (CuVO) 插层的二维碳化钒 MXene (VC-MXene) 纳米片。 CuVO在VC-MXene层间的插层克服了CuVO的自聚集，提高了其结构稳定性。同时，高导电性VC-MXene增大的层间距提高了复合材料内的电子传输。作为ZIB的正极，CuVO插层VC-MXene（CuVO@VC-MXene）电池在0.5 A g-1放电时表现出高达551.8 mAh g-1的容量。在6.0 A g的高电流密度下循环3000次后容量保持率达到91.8%。相比之下，CuVO//Zn电池在0.5 A g-1下的容量仅为193.3 mAh g-1，在6.0 A g-1下循环3000次后容量保持率仅为43.1%。同时，与 CuVO//Zn 相比，CuVO@VC-MXene//Zn 的倍率性能大大提高。这项工作中的 CuVO@VC-MXene 复合纳米板在制造高容量金属离子电池方面显示出前景。