钠离子电池层状氧化物正极材料的改性与性能优化

Modification and Performance Optimization of Layered Oxide Cathode Materials for Sodium-Ion Batteries

摘要

钠离子电池是锂离子电池的有效替代品，在大规模储能应用中具备显著的价格优势和物质供应优势。层状氧化物正极材料因具有高比容量、成熟稳定的合成工艺及良好的环保性能，成为钠离子电池领域的重要发展方向。然而，其在充放电过程中存在的结构相变多样、钠离子扩散缓慢、界面副反应频发、空气稳定性差等问题，严重阻碍了规模化应用进程。为解决上述难题，本文全面总结了层状氧化物正极材料的改性研究成果，重点聚焦金属元素相关改性手段，系统阐述了阳离子（金属）掺杂、金属基表面包覆以及金属元素调控下的结构优化三种核心改性方式的作用机理与性能提升效果，深入探讨了多种金属相关改性措施联合使用对电极材料整体电化学性能的协同增强作用。研究表明，金属阳离子掺杂可有效抑制不利相变、强化晶格结构稳定性；金属基表面包覆能显著提升电极材料的界面稳定性和电荷迁移效率；金属元素参与的结构调控可优化钠离子迁移路径与电子传导体系；多种金属相关改性手段的协同应用，可使材料获得更优异的结构稳定性、更高的倍率容量及更长的循环寿命。

Abstract

Sodium-ion batteries are effective alternatives to lithium-ion batteries and have significant advantages in terms of cost and material supply for large-scale energy storage applications. Layered oxide cathode materials have become an important development direction in the field of sodium-ion batteries due to their high specific capacity, mature and stable synthesis process, and good environmental performance. However, problems such as diverse structural phase transitions during charge and discharge, slow sodium-ion diffusion, frequent interfacial side reactions, and poor air stability seriously hinder their large-scale application. To address these challenges, this paper comprehensively summarizes the research results on the modification of layered oxide cathode materials, with a focus on metal element-related modification methods. It systematically expounds the mechanism and performance improvement effects of three core modification methods: cation (metal) doping, metal-based surface coating, and structure optimization under the regulation of metal elements. It also deeply explores the synergistic enhancement effect of the combined use of multiple metal-related modification measures on the overall electrochemical performance of electrode materials. The research shows that metal cation doping can effectively suppress unfavorable phase transitions and enhance the stability of the lattice structure; metal-based surface coating can significantly improve the interface stability and charge transfer efficiency of electrode materials; structure regulation involving metal elements can optimize the sodium-ion migration path and electronic conduction system; the combined application of multiple metal-related modification methods can enable materials to achieve better structural stability, higher rate capacity, and longer cycle life.

关键词

钠离子电池 / 层状氧化物 / 正极材料 / 金属基改性 / 性能优化

Key words

sodium-ion batteries / layered oxides / cathode materials / metal-based modification / performance optimization

参考文献

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