化学计量学
材料科学
电化学
阴极
氧化物
相(物质)
电极
化学工程
无机化学
离子
物理化学
化学
冶金
工程类
有机化学
作者
Junghoon Yang,Jin‐Myoung Lim,Mihui Park,Gi‐Hyeok Lee,Suwon Lee,Maenghyo Cho,Yong‐Mook Kang
标识
DOI:10.1002/aenm.202102444
摘要
Abstract Layer‐structured oxide cathodes have a lot of phases, which can be varied depending on Na ion contents and finally determine their electrochemical properties. Therefore, the off‐stoichiometry of layer‐structured oxides with the Na ions may differentiate not only their capacities but also the cyclic stabilities, kinetics, and so on, highlighting the importance of Na ion content. However, Na 2 CO 3 tends to be irreversibly formed on surface by making use of the Na ions lost from the lattice. Thereby, the O3 phase with stoichiometric Na content changes into the off‐stoichiometric P2 phase bringing about significant disadvantages. To address this issue, a thermal activation process is suggested to simultaneously decompose Na 2 CO 3 into electrochemically active Na ions and modulate the off‐stoichiometric P2 phase into the stoichiometric O3 phase. This study indicates that minimizing the loss of Na ions and maintaining the lattice framework with higher contents of Na ions during the synthesis of Na‐incorporating layered cathodes should be a key toward attaining electrochemical superiority.
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