Nonbattery behavior related phase transition of electrodes is usually not favorable for any batteries because it results in performance degradation at all times. Here, we demonstrate a zinc hybrid-ion battery (ZHIB) with an unusual capacity enhancement even within 18 000 cycles by employing V2CTX MXene as the cathode, enormously differing from all reported counterparts with capacity degradation initiated within hundreds of cycles. The dominated mechanisms are determined to be MXene delamination and an unexpected phase transition during cycling. Both the original cathode and secondary derivative contribute to capacity simultaneously, resulting in the unusual capacity enhancement. Consequently, the specific capacity of 508 mAh g-1 (highest for all reported aqueous zinc-ion batteries) and high energy density of 386.2 Wh kg-1 are realized. Also, the quasi-solid-state batteries fabricated can output stably at -20 °C and in bending, twisting, stabbing, and cutting conditions. Our work brings an effective approach, that is, utilizing "unstable" electrode materials, which should usually be avoided, to achieve continuously enhanced performance of a battery. The idea to use both original and secondary materials for energy storage may be developed to be a general method to achieve extraordinary cycling stability of batteries.

中文翻译：

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V2CTX MXene的相变诱导水合锌离子电池异常的电化学性能。

与电极的非电池行为相关的相变通常对于任何电池都是不利的，因为它始终导致性能下降。在这里，我们展示了一种锌杂化电池（ZHIB），即使采用V2CTX MXene作为阴极，其容量甚至在18 000个循环内也都有不同寻常的提高，这与所有报道的同类产品都大为不同，在数百个循环内引发了容量下降。确定的主要机制是MXene分层和循环过程中意外的相变。原始阴极和二次衍生物都同时对容量作出贡献，从而导致容量异常增加。因此，实现了508 mAh g-1的比容量（对于所有报告的水性锌离子电池来说是最高的）和386.2 Wh kg-1的高能量密度。也，所制造的准固态电池可以在-20°C的弯曲，扭曲，刺伤和切割条件下稳定输出。我们的工作带来了一种有效的方法，即利用通常应避免使用的“不稳定”电极材料来实现电池性能的不断提高。可以同时使用原始材料和辅助材料进行能量存储的想法发展为实现电池异常循环稳定性的通用方法。