Oxygen Edge-Sharing Strategy in P2-Type Na0.67MnO2 Cathodes: Synergistic Enhancement of Intercalation Kinetics and Air Stability

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2025-01-05 DOI:10.1002/adfm.202420682

Yuanming Liu, Shiyu Wang, Weijie Fu, Shuyun Yao, Yingjie Ji, Jingxian Li, Lanlan Shi, Xiaojun Wang, Feike Zhang, Jinghua Yang, Ruilong Liu, Jiangzhou Xie, Zhiyu Yang, Yi-Ming Yan

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Abstract

Mn-based layered oxides have garnered significant attention as cathode materials for energy storage due to their environmental benignity and high theoretical specific capacity. However, practical applications remain constrained by sluggish Na⁺ intercalation kinetics and poor structural stability. In this study, it is engineered that the Mn-O-B unit through an oxygen edge-sharing strategy to modulate Mn─O covalency in P2-type Na_0.67MnO₂, thereby achieving high specific capacity and structural stability. Both experimental results and density functional theory (DFT) calculations reveal that increased TM-O covalency facilitates Na⁺ diffusion in P2-type Na_0.67MnO₂ while simultaneously enhancing air stability. The as-prepared P2-type Na_0.67MnB_0.05O₂ exhibits a specific capacitance of 452 F g⁻¹ at 1 A g⁻¹, maintaining 96.75% capacity retention after 8800 cycles. This work elucidates the critical role of oxygen edge-sharing in optimizing interactions between transition metal and oxygen atoms, establishing a relationship between Mn─O structure and functional properties. These findings advance the development of high-performance energy storage technologies.

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来源期刊

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.