Yin Chengjie, Li Lan, Jia Rui, Hu Jinsong
The First Affiliated Hospital of Anhui University of Science and Technology, Anhui University of Science and Technology, Huainan, Anhui 232001, P. R. China.
School of Chemical and Blasting Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, P. R. China.
Inorg Chem. 2024 Oct 28;63(43):20551-20561. doi: 10.1021/acs.inorgchem.4c03146. Epub 2024 Oct 20.
VO undergoes irreversible phase transition and collapse of layered structure during the Zn insertion/extraction, which severely limits its application as a cathode for aqueous zinc-ion batteries (AZIBs). Herein, a synergistic strategy of conductive polyaniline insertion and graphene composite was proposed to boost the Zn storage performance of the VO cathode. A square-shaped polyaniline (PANI)-intercalated and graphene-composited vanadium oxide (GO/PANI-PVP/VO) structure was successfully synthesized via an in situ oxidation/insertion polymerization combined with a hydrothermal method. The results showed that PANI intercalation and the composite of graphene combined with layered VO, enabling reversible intercalation of Zn/H. The insertion of conjugated PANI not only increases the lattice spacing of VO, providing a channel for rapid transport of Zn, but also increases the storage sites for charges through doping/dedoping processes and redox conversion reactions. GO/PANI-PVP/VO delivers an excellent specific capacity (495 mA h g at 0.1 A g), wonderful rate capability (208 mA h g at 30 A g), and good cycling stability (93% after 4000 cycles). Our results provide a new approach for adjusting the valence states, interlayer spacing, and rational design of organic-inorganic compound materials for different functional materials.
在锌插入/脱出过程中，VO会发生不可逆的相变和层状结构的坍塌，这严重限制了其作为水系锌离子电池（AZIBs）正极的应用。在此，提出了一种导电聚苯胺插入与石墨烯复合的协同策略，以提高VO正极的锌存储性能。通过原位氧化/插入聚合结合水热法，成功合成了方形聚苯胺（PANI）插层且石墨烯复合的氧化钒（GO/PANI-PVP/VO）结构。结果表明，PANI插层以及石墨烯与层状VO的复合，使得Zn/H能够可逆嵌入。共轭PANI的插入不仅增加了VO的晶格间距，为Zn的快速传输提供了通道，还通过掺杂/去掺杂过程和氧化还原转化反应增加了电荷存储位点。GO/PANI-PVP/VO具有出色的比容量（在0.1 A g时为495 mA h g）、优异的倍率性能（在30 A g时为208 mA h g）以及良好的循环稳定性（4000次循环后为93%）。我们的结果为调整不同功能材料的价态、层间距以及有机-无机复合材料的合理设计提供了一种新方法。
