High Rate Performance of Aqueous Magnesium-iron-ion Batteries Based on Fe2O3@GH as the Anode

• 作者: SHAO Shuang-Xi CANG Rui-Bai YE Ke GAO Yin-Yi ZHU Kai YAN Jun WANG Gui-Ling CAO Dian-Xue
• 来源期刊: 结构化学
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: materials structural chemistry
• 页码范围: 908-918
• 页数: 11页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2011-3063

摘要

Aqueous Mg-ion batteries(MIBs)are safe,non-toxic and low-cost.Magnesium has a high theoretical specific capacity with its ion radius close to that of lithium.Therefore,aqueous magnesium ion batteries have great research advantages in green energy.To acquire the best electrode materials for aqueous magnesium ion batteries,it is necessary for the structural design in material.Fe2O3 is an anode material commonly used in Li-ion battery.However,the nano-cube Fe2O3 combined with graphene hydrogels(GH)can be successfully prepared and employed as an anode,which is seldom researched in the aqueous batteries system.The Fe2O3/GH is used as anode in the dual MgSO4+FeSO4 aqueous electrolyte,avoiding the irreversible deintercalation of magnesium ions.In addition,the Fe element in anode material can form the Fe3+/Fe2+and Fe2+/Fe3+redox pairs in the MgSO4+FeSO4 electrolyte.Thus,the reversible insertion/(de)insertion of magnesium and iron ions into/from the host anode material can be simultaneously achieved.After the initial charge,the anodic structure is changed to be more stable,avoiding the formation of MgO.The Fe2O3/GH demonstrates high rate properties and reversible capacities of 198,151,121,80,75 and 27 mAh g-1 at 50,100,200,300,500 and 1000 mAg-1 correspondingly.