钒
锌
水溶液
材料科学
氧化钒
配体(生物化学)
离子
无机化学
纳米技术
化学
冶金
物理化学
有机化学
生物化学
受体
作者
Heng Liu,Long Yang,Ting Shen,Changyuan Li,T. W. Kang,Huanhuan Niu,Wei‐Hsiang Huang,Chun‐Chi Chang,Menghao Yang,Guozhong Cao,Chaofeng Liu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2025-02-28
标识
DOI:10.1021/acsnano.4c18250
摘要
Layered hydrate vanadates are promising cathode materials for aqueous zinc-ion batteries (AZIBs). Various intercalants have been preinserted into the interplanar space of hydrate vanadates with significantly enhanced kinetics and stabilized structures. However, such an enhancement is induced by various intercalants, and the relationship between the property enhancement and the type of intercalant still needs to be revealed. In this work, the distortion of octahedra induced by the preintercalation of benzyltrimethylammonium (BTA+) cations into hydrate vanadium pentoxide (V2O5·nH2O, VOH) and the change in ligand field are studied using synchrotron X-ray pair distribution function (PDF) and X-ray absorption fine structure (XAFS). Variations in the local coordination of vanadium alter the ligand field, decreasing the energy of the lowest unoccupied orbitals (e*), which leads to an increased electrochemical potential. Additionally, the introduced BTA+ facilitates fast ion diffusion and stabilizes the layer structure. A cathode with a distorted local structure delivers a specific capacity of 408 mAh/g at 0.5 A/g, with a capacity retention of 95% after 3000 cycles at 8 A/g.
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