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可持续的,含低Ni的Mg化层氧化物作为离子电池的阴极

Pedro Lavela¹, Julia Leyva¹, José Luis Tirado¹

¹Departamento de Química Inorgánica e Ingeniería Química, Instituto Químico para la Energía y el Medioambiente (IQUEMA), Universidad de Córdoba, Edificio Marie Curie, Campus de Rabanales, 14071 Córdoba, Spain. iq1lacap@uco.es.

Dalton transactions (Cambridge, England : 2003)

|November 8, 2023

概括

开发了具有低和铁含量的新离子电池电极. 即使在低温下,F0N05材料也表现出卓越的电化学性能,为储能提供了一个可持续的替代方案.

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:

由于可能出现供应短缺,对离子电池日益增长的需求需要替代电极材料.
在正极合成中减少或消除和铁对于可持续的电池生产至关重要.

研究的目的:

合成和表征具有最小化和铁含量的新型离子电池电极材料.
评估这些新材料的电化学性能,重点关注容量,保留和低温行为.

主要方法:

使用可扩展的sol-gel方法合成了一系列Na_0.67Mg_0.05Fe_xNi_yMn_zO₂化合物.
使用结构,形态和光谱分析 (XRD,SEM,XPS) 来确认样品的纯度和结晶性.
电化学测试,包括循环电压测量和阻抗光谱,评估电池性能.

主要成果:

含和铁含量最低的F0N05样本在5°C (约5°C) 时表现出异常的电化学性能. 100 mA hg (-1) 和良好的容量保留超过100个周期.
即使在-15°C下也保持了出色的性能,这表明了强大的低温操作.
电化学技术揭示了快速的离子交换,显著的电容贡献和高的表面扩散系数.

结论:

开发的低和铁电极材料,特别是F0N05,为离子电池提供了一个有希望和可持续的替代品.
该材料表现出良好的循环稳定性和过渡金属和氧的可逆氧化还原活性.
没有有害的相位过渡 (P2-O2,P2-P2') 可以确保循环过程中的结构完整性.

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