电源技术2025，Vol.49Issue(7)：1303-1312,10.DOI:10.3969/j.issn.1002-087X.2025.07.001
Co掺杂δ-MnO2正极材料的制备及其储锌性能研究
Preparation of Co-doped δ-MnO2 cathode materials and zinc ion storage performances
摘要
Abstract
To address the issues of poor dynamic performance and structural stability of manganese-based cathode materials in aqueous zinc-ion batteries during cycling,a cobalt doping strategy was proposed to modify the structure of δ-MnO2.Layered δ-MnO2 materials with different cobalt doping ratios(1％,3％,5％)were successfully synthesized via the hydrothermal method,and the structure-performance relationship between doping concentration and material properties was revealed.The re-sults reveal that the incorporation of Co enhances the oxygen vacancy concentration of the material,providing more active sites for Zn2+storage and effectively improving the ion diffusion kinetics.This leads to a significant increase in the ion diffusion coefficient of the charge carriers in δ-MnO2 and pro-motes the proton co-storage,thereby improving the material's cycling stability and rate performance.Evaluation of electrochemical performance indicates that among the δ-MnO2 materials doped with different amounts of Co,the 3％Co-doped δ-MnO2 exhibits the best zinc-storage performance.At a current density of 2 A/g,it achieves an initial specific capacity of 187 mAh/g,and after 800 cycles,it maintains a specific capacity of 151 mAh/g,with a specific capacity retention of 80％.In contrast,the undoped pristine δ-MnO2 delivers an initial specific capacity of only 144 mAh/g,and after 800 cycles,its specific capacity drops to 40 mAh/g,resulting in a capacity retention of just 28％.These results clearly demonstrate that Co doping effectively enhances the cycling stability and rate capability of manganese-based oxides,providing insights for the development of high-performance cathode materi-als for zinc-ion batteries.关键词
锰基氧化物/正极材料/锌离子电池/倍率性能/循环性能Key words
manganese oxides/cathode materials/zinc ion batteries/rate performance/cycling per-formance分类
信息技术与安全科学引用本文复制引用
何子雨,黄亚楠,吴刚,葛正庭,黄海舰,张卫新..Co掺杂δ-MnO2正极材料的制备及其储锌性能研究[J].电源技术,2025,49(7):1303-1312,10.基金项目
国家自然科学基金面上项目(52472198) （52472198）
国家自然科学基金青年科学基金(22108053) （22108053）
安徽省动力与储能电池产业创新研究院项目(202305C12020015) （202305C12020015）
