As a promising power supplier, flexible aqueous zinc ion batteries (AZIBs) have drawn great attention and been demonstrated potential applications in portable electronic devices, yet their capacity, stability, and rate performance are severely limited by cathode materials. Herein, a spontaneous encapsulation and in situ phase transformation strategy is proposed for the construction of heterostructured amorphous vanadium oxide@carbon/graphene (A‐VOx@C/G) nanoplates as highly stable and efficient cathode materials for Zn2+ storage. In this design, A‐VOx provides abundant active sites with rapid ion diffusion channels and robust tolerance against ion insertion/extraction, while N‐doped carbon encapsulation and interlaced graphene network ensure efficient electron transfer. The mechanisms respectively for phase transformation during electrochemical amorphization and charge storage during cycling are investigated in detail. The as‐prepared A‐VOx@C/G achieves an outstanding electrochemical performance with 429 mAh g−1 at 0.5 A g−1, 73% retained at 20 A g−1 (315 mAh g−1), and excellent stability over 2000 cycles at 20 A g−1 (91% retention). Moreover, quasi‐solid‐state AZIBs assembled from A‐VOx@C/G cathode exhibit high flexibility and can sustain large mechanical deformation without performance degradation. It is believed that this study provides a guideline toward designing high‐performance cathode materials for AZIBs through structure optimization.

中文翻译：

---

非晶态钒 Oxides@Carbon/石墨烯纳米板的异质结构设计提高了 Zn2+ 存储的容量、循环稳定性和高倍率性能


柔性水性锌离子电池 （AZIBs） 作为一种前景广阔的电源，受到了极大的关注，并在便携式电子设备中得到了潜在的应用，但其容量、稳定性和倍率性能受到正极材料的严重限制。在此，提出了一种自发封装和原位相变策略，用于构建异质结构非晶钒 oxide@carbon/石墨烯 （A-VOx@C/G） 纳米板作为高度稳定和高效的 Zn2+ 存储正极材料。在此设计中，A-VOx 提供了丰富的活性位点，具有快速离子扩散通道和对离子插入/提取的强大耐受性，而 N 掺杂碳封装和交错石墨烯网络确保了高效的电子转移。详细研究了电化学非晶化过程中的相变和循环过程中的电荷存储机制。所制备的 A-VOx@C/G 实现了出色的电化学性能，在 0.5 A g-1 时为 429 mAh g-1，在 20 A g-1 （315 mAh g-1） 下保留 73%，在 20 A g-1 下在 2000 次循环中具有出色的稳定性（91% 保留）。此外，由 A-VOx@C/G 阴极组装的准固态 AZIBs 表现出高柔韧性，可以承受较大的机械变形而不会降低性能。相信本研究为通过结构优化设计高性能 AZIBs 正极材料提供了指导。