Doping of manganese hexacyanoferrate with cobalt for improving electrochemical performance in high-energy sodium-ion batteries

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-04-17 DOI:10.1016/j.mseb.2025.118308

Jie Li , Limin Liu , Yuting Gao , Jinze Guo , Xin Long , Shilei Chen , Songting Yang , Qi Yuan , Yifei Sun , Zhongye Lan , Yuping Liu , Xiaoliang Zhou , Yinzhu Jiang

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引用次数: 0

Abstract

Manganese hexacyanoferrate’s (MnHCF) high theoretical specific capacity and high voltage platform make it a promising material for a wide range of applications. Nevertheless, the conversion of Mn²⁺ and Mn³⁺ during the charging and discharging process of MnHCF might result in a severe Jahn-Teller distortion, which would cause lattice deformation and structural collapse, compromising its cycle stability. The strategy of Co-doping can reduce lattice defects, increase the initial sodium content in the material, raise the material’s conductivity, and enhance the diffusion kinetics of sodium ions. Furthermore, Co-doping can effectively reduce the changes in unit cell volume and Mn-N bond length during charge and discharge processes, alleviate the Jahn-Teller effect of Mn, and enhance the cycling stability of the material, as verified by the Ex-situ XRD. The MnCoHCF-5 % sample exhibits excellent discharge capacity and cycling stability, with a specific capacity high up to 149.80 mAh g⁻¹ at 0.1C and 60.14 % capacity retention at 1C after 300 cycles. This study provides an effective method for developing PBAs cathode materials with high specific capacity and cycling stability.

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六氰高铁酸锰掺杂钴改善高能钠离子电池电化学性能

六氰高铁酸锰（MnHCF）的高理论比容量和高电压平台使其成为一种具有广泛应用前景的材料。然而，在MnHCF充放电过程中，Mn2+和Mn3+的转化可能会导致严重的Jahn-Teller畸变，导致晶格变形和结构崩溃，影响其循环稳定性。共掺杂策略可以减少晶格缺陷，增加材料中的初始钠含量，提高材料的电导率，增强钠离子的扩散动力学。此外，通过x射线衍射（Ex-situ XRD）证实，共掺杂可以有效地减小充放电过程中单体电池体积和Mn- n键长度的变化，缓解Mn的Jahn-Teller效应，增强材料的循环稳定性。mncohcf - 5%样品表现出优异的放电容量和循环稳定性，在0.1C下比容量高达149.80 mAh g−1，在1C下循环300次后容量保持率为60.14%。本研究为开发具有高比容量和循环稳定性的PBAs正极材料提供了有效的方法。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.