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抑制高性能离子电池的改性层氧化物中的结构降解

Hong Chen¹, Lu-Kang Zhao¹, She-Dong Li¹

¹Institute for Energy Electrochemistry and Urban Mines Metallurgy, School of Metallurgy, Northeastern University, Liaoning 110819, China.

Journal of colloid and interface science

|May 3, 2025

概括

兴奋剂稳定了离子电池 (PIB) 的K_0.5MnO₂阴极. 这种结构增强提高了循环稳定性和能量密度,为先进的储能解决方案铺平了道路.

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:

基于的多层过渡金属 (TM) 氧化物是离子电池 (PIB) 的有希望的阴极材料,因为它们的经济可行性和易于合成.
然而,结构不稳定性,包括过渡金属溶解和相变,阻碍了它们在储能中的实际应用.

研究的目的:

为了提高PIBs的K_0.5MnO₂阴极的结构稳定性和电化学性能.
研究 (Mo) 兴奋剂对减轻结构降解和改善离子扩散动力学的影响.

主要方法:

合成K_0.5Mn_0.95Mo_0.05O₂ (KMMO) 通过固态烧结使用MoO₃作为剂来源.
结构性表征以确认Mo⁶⁺被纳入过渡金属部位.
电化学测试KMMO作为PIB中的阴极材料,包括循环稳定性和能量密度测量.
使用KMMO阴极和纳米石墨阳极制造和测试一个全电池电池.

主要成果:

6+合并通过形成Mn-O-Mo键,抑制Mn溶解和Jahn-Teller效应来稳定K0.5MnO2的晶体结构.
在KMMO阴极表现出增强的循环稳定性,在1C的500个循环后保持71.93mAhg-1的放电容量.
能量密度显著提高,为KMMO的224.87Wh/kg,而无兴奋剂材料的175.48Wh/kg.
一个完整的电池在0.5°C时表现出67.8mAhg-1的排放特异容量.

结论:

兴奋剂是一种有效的策略,可以稳定离子电池的多层氧化阴极.
改进的KMMO结构完整性和电化学性能突显了针对先进的储能材料的有针对性的兴奋剂的潜力.
这项工作证明了使用结构调节层氧化物用于高性能PIB的可行性.

关键词:

有层的氧化物.基于的正极材料是以为基础的.莫·兴奋剂的使用情况离子电池离子电池结构稳定性结构稳定性

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