阴极
材料科学
八面体
过渡金属
氧化物
离子
法拉第效率
氧化还原
钠
纳米技术
化学工程
电化学
电极
化学
催化作用
冶金
物理化学
有机化学
生物化学
工程类
作者
Suning Gao,Zhuo Zhu,Hengyi Fang,Kun Feng,Jun Zhong,Machuan Hou,Yihe Guo,Fēi Li,Wei Zhang,Zi-Feng Ma,Fujun Li
标识
DOI:10.1002/adma.202311523
摘要
Layered transition-metal (TM) oxide cathodes have attracted growing attention in sodium-ion batteries (SIBs). However, their practical implementation is plagued by Jahn-Teller distortion and irreversible cation migration, leading to severe voltage decay and structure instability. Herein, O3-Na0.898K0.058Ni0.396Fe0.098Mn0.396Ti0.092O2 (KT-NFM) is reported as an ultrastable cathode material via multisite substitution with rigid KO6 pillars and flexible TiO6 octahedra. The K pillars induce contracted TMO2 slabs and their strong Coulombic repulsion to inhibit Ni/Fe migration; and Ti incorporation reinforces the hybridization of Ni(3deg*)-O(2p) to mitigate the undesired O3-O'3 phase transition. These enable the reversible redox of Ni2+↔Ni3.20+ and Fe3+↔Fe3.69+ for 138.6 mAh g-1 and ultrastable cycles with >90% capacity retention after 2000 cycles in a pouch cell of KT-NFM||hard carbon. This will provide insights into the design of ultrastable layered cathode materials of sodium-ion batteries and beyond.
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