自行车
兴奋剂
阴极
水溶液
离子
材料科学
化学
化学工程
无机化学
光电子学
物理化学
工程类
有机化学
考古
历史
作者
Qian Wang,Zhenzhen Liu,Ting Xu,Hongjiao Li,Yungui Chen,Yigang Yan
标识
DOI:10.1016/j.jpowsour.2024.234763
摘要
MnO2 has been widely investigated as a promising cathode material for aqueous magnesium-ion batteries, which, however, suffers from the severe capacity fading during charge/discharge cycling. In present work, we report that the doping of Fe in α-MnO2 enlarges the lattice and alleviates the Jahn–Teller distortions and thus accelerates the Mg2+ diffusion and strengthens the structural stability. Consequently, the capacity retention remarkably increases from 44.3 % to 85.2 % after 1000 cycles by Fe doping. Furthermore, it is found for the first time that Fe doping enables the co-insertion of H+ and Mg2+ in the tunnels of α-MnO2, which improves remarkably the specific capacity from 131.9 to 205.9 mA h g−1 at 0.1 A g−1.
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