Ca2+/NH4+双掺杂二氧化锰用作锌离子电池正极材料研究
Study on Ca2+/NH4+ Dual-Doped Manganese Dioxide as Cathode Material for Zinc-Ion Batteries
张立朋 1孙南 1杨进刚1
作者信息
- 1. 西南大学材料与能源学院，重庆，400715
- 折叠
摘要
水系锌离子电池因高安全、低成本等优势成为大规模储能领域的研究热点。层状δ-MnO2是比较理想的锌电池正极材料，但亦存在结构坍塌、锰溶解和导电性差等问题。本文采用一步水热法制备了纯δ-MnO2，Ca2+、NH4+单掺杂及双掺杂δ-MnO2等样品，通过SEM、XRD、EDS表征了样品的结构形貌与成分，并测试了电化学性能。结果显示，双掺杂电极在0.1 A g-1下的放电比容量为323.7 mAh g-1，在3.0 A g-1下仍保持55.3 mAh g-1，在0.5 A g-1循环1000次后容量保持率仍为82.7%。这是因为，Ca2+起支撑作用、NH4+可形成氢键，二者协同作用来抑制锰的溶解和结构坍塌，加快Zn2+传输。本实验为锰基正极的开发提供了实验参考。
Abstract
Aqueous zinc-ion batteries have emerged as a popular research focus for large-scale energy storage applications, benefiting from their high safety and low cost. As a promising layered cathode material, δ-MnO2 suffers from structural destruction, manganese ion dissolution, slow ion migration rate and poor electronic conductivity. In this study, pure δ-MnO2, Ca2+ single-doped δ-MnO2, NH4+ single-doped δ-MnO2 and Ca2+/NH4+ co-doped δ-MnO2 materials were successfully prepared through one-step hydrothermal method. The crystal structure and microscopic morphology of all samples were characterized by XRD, SEM and EDS, and their corresponding electrochemical properties were systematically tested and analyzed. In the rate performance test, the co-doped electrode exhibits a specific capacity of 323.7 mAh g-1 at a current density of 0.1 A g-1, and it can still maintain a capacity of 55.3 mAh g-1 at 3.0 A g-1. After 1000 charge-discharge cycles at 0.5 A g-1, the capacity retention rate of the co-doped sample reaches 82.7%,and both charge transfer resistance and electrochemical polarization are obviously reduced. Electrochemical mechanism analysis indicates that the Ca2+ pillaring effect, oxygen vacancies and NH4+-induced hydrogen bond stabilization work together to inhibit manganese dissolution and structural deterioration, and accelerate Zn2+ migration speed. This study provides experimental basis and reference for the development of manganese-based cathode materials.关键词
水系锌离子电池/δ-MnO2/共掺杂/正极材料Key words
aqueous zinc-ion battery/δ-MnO2/co-doping/cathode material引用本文复制引用
张立朋,孙南,杨进刚.Ca2+/NH4+双掺杂二氧化锰用作锌离子电池正极材料研究[EB/OL].(2026-06-16)[2026-06-18].http://www.paper.edu.cn/releasepaper/content/202606-49.学科分类
发电、发电厂/独立电源技术
