Chen Feiran, Zhang Yan, Chen Shuai, Zang Hu, Liu Changjiang, Sun Hongxia, Geng Baoyou
College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, The Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials, Anhui Normal University, Wuhu 241002, China.
College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, The Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials, Anhui Normal University, Wuhu 241002, China; Institute of Energy, Hefei Comprehensive National Science Center, Anhui, Hefei 230031, China.
J Colloid Interface Sci. 2023 Nov;649:703-712. doi: 10.1016/j.jcis.2023.06.152. Epub 2023 Jun 24.
Spinel ZnMnO with a three-dimensional channel structure is one of the important cathode materials for aqueous zinc ions batteries (AZIBs). However, like other manganese-based materials, spinel ZnMnO also has problems such as poor conductivity, slow reaction kinetics and structural instability under long cycles. Herein, ZnMnO mesoporous hollow microspheres with metal ion doping were prepared by a simple spray pyrolysis method and applied to the cathode of aqueous zinc ion battery. Cation doping not only introduces defects, changes the electronic structure of the material, improves its conductivity, structural stability, and reaction kinetics, but also weakens the dissolution of Mn. The optimized 0.1 % Fe-doped ZnMnO (0.1% Fe-ZnMnO) has a capacity of 186.8 mAh g after 250 charge-discharge cycles at 0.5 A g and the discharge specific capacity reaches 121.5 mAh g after 1200 long cycles at 1.0 A g. The theoretical calculation results show that doping causes the change of electronic state structure, accelerates the electron transfer rate, and improves the electrochemical performance and stability of the material.
具有三维通道结构的尖晶石型ZnMnO是水系锌离子电池（AZIBs）的重要正极材料之一。然而，与其他锰基材料一样，尖晶石型ZnMnO也存在导电性差、反应动力学缓慢以及在长循环下结构不稳定等问题。在此，通过简单的喷雾热解法制备了具有金属离子掺杂的ZnMnO介孔空心微球，并将其应用于水系锌离子电池的正极。阳离子掺杂不仅引入缺陷、改变材料的电子结构、提高其导电性、结构稳定性和反应动力学，还减弱了Mn的溶解。优化后的0.1%铁掺杂ZnMnO（0.1% Fe-ZnMnO）在0.5 A g下经过250次充放电循环后容量为186.8 mAh g，在1.0 A g下经过1200次长循环后放电比容量达到121.5 mAh g。理论计算结果表明，掺杂导致电子态结构发生变化，加速了电子转移速率，提高了材料的电化学性能和稳定性。
