钒
容量损失
阴极
氧化还原
材料科学
离子
水溶液
兴奋剂
金属
电子传输链
化学
电池(电)
电极
无机化学
化学工程
化学物理
电化学
光电子学
物理化学
热力学
有机化学
生物化学
功率(物理)
物理
工程类
冶金
作者
Ping Luo,Wenhui Zhong,Wenwei Zhang,Min Zhou,Wen Tang,He Tang,Zhen Huang,Diling Zhu,Guolong Yu,Feiyang Chao,Juan Song,Xiujuan Wei,Shen Dong,Qinyou An
标识
DOI:10.1016/j.jcis.2024.04.020
摘要
VO2 (B) is recognized as a promising cathode material for aqueous zinc metal batteries (AZMBs) owing to its remarkable specific capacity and its unique, expansive tunnel structure, which facilitates the reversible insertion and extraction of Zn2+. Nonetheless, challenges such as the inherent instability of the VO2 structure, poor ion/electron transport and a limited capacity due to the low redox potential of the V3+/V4+ couple have hindered its wider application. In this study, we present a strategy to replace vanadium ions by doping Al3+ in VO2. This approach activates the multi-electron reaction (V4+/V5+), to increase the specific capacity and improve the structural stability by forming robust V5+O and Al3+O bonds. It also induces a local electric field by altering the local electron arrangement, which significantly accelerates the ion/electron transport process. As a result, Al-doped VO2 exhibits superior specific capacity, improved cycling stability, and accelerated electronic transport kinetics compared to undoped VO2. The beneficial effects of heterogeneous atomic doping observed here may provide valuable insights into the improvement electrode materials in metal-ion battery systems other than those based on Zn.
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