【摘要】 针对水系锌离子电池锰基正极材料在循环过程中存在的动力学性能不足、结构稳定性差等问题，提出钴掺杂策略对δ-Mn O₂进行结构改性。通过水热法成功制备了不同钴掺杂比例（1%、3%、5%）的层状δ-Mn O₂材料，揭示了掺杂浓度与材料性能的构效关系。研究表明，Co的引入提高了材料的氧空位浓度，为Zn²⁺提供了更多活性位点，有效改善了离子扩散动力学特性，显著提升了δ-Mn O₂中载流子的离子扩散系数，并促进了质子协同存储，从而改善了材料的循环稳定性和倍率性能。性能测试结果表明，在不同比例Co掺杂的δ-Mn O₂材料中，3%Co掺杂的δ-Mn O₂具有最优的储锌性能，其在2 A/g的电流密度下初始比容量达到187 m Ah/g，经过800次循环后比容量仍可保持151 m Ah/g，容量保持率高达80%；相比之下，未掺杂的原始δ-Mn O₂初始比容量仅为144 m Ah/g,800次循环后比容量下降至40 m Ah/g，容量保持率仅为28%。上述结果表明，Co掺杂可有效提升锰基氧化物的循环稳定性和倍率性能，为开发高性能锌离子电池正极材料提供了思路。更多还原

【Abstract】 To address the issues of poor dynamic performance and structural stability of manganesebased 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 structureperformance 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 m Ah/g,and after 800 cycles,it maintains a specific capacity of 151 m Ah/g,with a specific capacity retention of 80%.In contrast,the undoped pristine δ-MnO₂ delivers an initial specific capacity of only 144 m Ah/g,and after 800 cycles,its specific capacity drops to 40 m Ah/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.更多还原