Bi掺杂α-MnO2正极材料水热法制备与电极性能研究
Hydrothermal Preparation and Electrochemical Performance of Bi-Doped α-MnO2 Cathode Material
张琪文 1杨域 1蒲玉娟 1杨文静 1黎学明 1刘成伦1
作者信息
摘要
水系锌离子电池凭借高安全性与低成本优势，在储能领域引起了广泛关注。然而，其进一步的发展受限于正极材料，难以同时达到高比容量和长循环寿命。论文采用一步水热法成功制备Bi<sup>3+</sup>掺杂的α-MnO<sub>2</sub>纳米线正极材料，并与锌负极组装成全电池。结果表明，掺入铋元素可显著提高α-MnO<sub>2</sub>正极的电化学性能，改善离子扩散动力学。在1 A g<sup>-1</sup>电流密度下全电池循环2500圈后，比容量仍保持在200 mAh g<sup>-1</sup>左右，平均库伦效率达99.6%，表现出出色的长期循环稳定性；在3 A g<sup>-1</sup>的大电流密度下循环1000圈后，比容量维持在150 mAh g<sup>-1</sup>。该掺杂策略为高性能水系锌离子电池正极材料的设计提供了新思路。
Abstract
Aqueous zinc-ion batteries have attracted widespread attention in the field of energy storage due to their high safety and low cost. However, their further development is limited by cathode materials, making it difficult to achieve both high specific capacity and long cycle life. In this paper, Bi<sup>3+</sup> doped α-MnO<sub>2</sub> nanowire cathode materials were successfully prepared by a one-step hydrothermal method and assembled into full cells with zinc anodes. The results show that bismuth doping significantly improves the electrochemical performance of the α-MnO<sub>2</sub> cathode and enhances ion diffusion kinetics. After 2500 cycles at a current density of 1 A g<sup>-1</sup>, the specific capacity of the full cell remains around 200 mAh g<sup>-1</sup> with an average Coulombic efficiency of 99.6%, demonstrating outstanding long-term cycling stability. Even at a high current density of 3 A g<sup>-1</sup>, a specific capacity of 150 mAh g<sup>-1</sup> is maintained after 1000 cycles. This doping strategy provides a new insight for the design of high-performance cathode materials for aqueous zinc-ion batteries.关键词
水系锌离子电池/正极材料/二氧化锰/离子掺杂Key words
Aqueous zinc-ion batteries/Cathode materials/Manganese dioxide/Ion doping引用本文复制引用
张琪文,杨域,蒲玉娟,杨文静,黎学明,刘成伦.Bi掺杂α-MnO2正极材料水热法制备与电极性能研究[EB/OL].(2026-04-27)[2026-04-28].http://www.paper.edu.cn/releasepaper/content/202604-203.学科分类
电化学工业/无机化学工业/金属元素无机化合物化学工业
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