有色金属材料与工程2025，Vol.46Issue(1)：48-56,9.DOI:10.13258/j.cnki.nmme.20240312002
In3+掺杂提升钠离子电池铁锰基层状氧化物正极稳定性
Enhancement of stability in iron-manganese layered oxide cathode for sodium-ion batteries via In3+doping
摘要
Abstract
O3-type NaFe0.5Mn0.5O2,known for its cost-effectiveness,stands as a promising commercial layered cathode material for sodium-ion batteries.Nonetheless,its poor cycling stability is one of the main challenges in commercialization.The irreversible phase transition and transition metal(TM)ion migration,induced by the strong Jahn-Teller effect of Mn3+during Na+disembedding,are the main causes of capacity decay.The research that substituted Mn3+with electrochemically inert In3+found that In3+doping suppresses the Jahn-Teller effect by modulating the valence state of TM ions,thereby enhancing structural stability;effectively strengthens the bond energy between TM―TM and between TM―O,reduces the spacing between TM layers and minimizes the possibility of TM ion migration;reduces the particle size of cathode materials,shortens the transmission distance of Na+and enhances diffusion capability.The modified NaFe0.5Mn0.5-xInxO2 exhibits improved rate performance and cycling stability within the 2.0-4.0 V voltage,offering a reversible capacity of 111.4 mA·h/g.After 200 cycles,its capacity retention rate increases from 25.78％to 93.62％.关键词
钠离子电池/层状正极/O3型NaFe0.5Mn0.5O2/Jahn-Teller效应/In3+掺杂Key words
sodium-ion batteries/layered cathode/O3-type NaFe0.5Mn0.5O2/Jahn-Teller effect/In3+doping分类
动力与电气工程引用本文复制引用
李鹏志,盛子墨,范哲,袁涛..In3+掺杂提升钠离子电池铁锰基层状氧化物正极稳定性[J].有色金属材料与工程,2025,46(1):48-56,9.基金项目
国家自然科学基金资助项目(22379096) （22379096）
