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从Li到Na:通过Mn替代基酸盐聚离子型阴极材料的探索性分析

Yilong Chen¹, Guifan Zeng¹, Baodan Zhang¹

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Xiamen University, Xiamen, 361005, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|August 25, 2023

概括

在铁酸盐 (LFP) 和铁酸盐 (NFP) 阴极材料中的替代提高了能量密度和循环稳定性. 本研究详细介绍了结构变化和改进的离子传输,指导未来的高性能电池设计.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

酸聚离子类型的阴极材料,包括铁酸 (LFP) 和铁酸 (NFP),具有高的理论容量,具有成本效益.
(Mn) 替代被探索以增强电化学性质,但结构演变和性能之间的联系仍然不清楚.

研究的目的:

研究替代对LFP和NFP阴极材料的电化学特性和结构演变的影响.
阐明在替代后局部结构变化和电化学性能之间的关系.

主要方法:

合成和表征Mn替代的LFP和NFP材料.
电化学测试,包括充/放电循环和容量保留测量.
结构分析以了解离子运输路径和相位过渡.

主要成果:

替代改善了LFP的能量密度 (LiFe_0.5Mn_0.5PO₄达到535.3Wh kg^-1) 和NFP的周期稳定性 (NaFe_0.7Mn_0.3PO₄在250个周期后保持了89.6%的容量).
替代扩大了离子运输通道,提高了离子扩散系数.
LiFe_0.5Mn_0.5PO₄表现出稳定的单相过渡,而NaFe_0.7Mn_0.3PO₄避免了无形相过渡,保持了结构完整性.

结论:

替代是一种有效的策略,可以提高LFP和NFP阴极材料的电化学性能.
了解Mn诱导的结构变化,可以了解改善的离子流动性和相位稳定性.
这项研究为设计用于储能应用的先进聚离子类型阴极提供了宝贵的指导.

关键词:

/离子电池的使用情况替代 Mn 替代 Mn 替代 Mn 酸盐是一种酸盐.聚离子类型的阴极.结构稳定性结构稳定性

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