氧化还原
过渡金属
阴极
雅恩-泰勒效应
氧化物
金属
氧气
兴奋剂
无机化学
离子
材料科学
化学
分析化学(期刊)
结晶学
物理化学
催化作用
有机化学
生物化学
光电子学
色谱法
作者
Yichao Wang,Sooran Kim,Jingyu Lu,Guangyuan Feng,Xin Li
标识
DOI:10.1002/batt.201900172
摘要
Abstract Layered sodium metal oxide cathodes have much broader choice of transition metal elements than the Li counterparts. A reversible Cu 2+/3+ redox couple has recently been introduced in such Na cathodes. To study the role of Cu, here P2‐type layered Na 0.75 Mn 0.6 Fe 0.2 (Cu x Ni 0.2‐ x )O 2 compounds have been designed, synthesized and investigated. It shows the high initial capacity of 206 mAh/g and good capacity retention. Reversible oxygen redox activity is observed in our experiments. Our DFT calculations suggest that Cu can stabilize the oxygen redox by modifying the electronic structure together with Fe at high voltages. In addition, the strong P′2 transition observed at low voltages is induced by Jahn‐Teller active Cu 2+ with two competing effects of enhanced Na ion diffusivity and reduced electronic conductivity.
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