Atomistic Observation of Desodiation-Induced Phase Transition in Sodium Tungsten Bronze
Atomistic Observation of Desodiation-Induced Phase Transition in Sodium Tungsten Bronze
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钠钨青铜中脱钠诱导相变的原子观察
DOI：
10.1021/acs.jpclett.1c00132
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发表时间：
2021
影响因子：
5.7
通讯作者：
Wang Jianbo
中科院分区：
文献类型：
--
作者：
Meng Qi;Zhuang Yuanlin;Jiang Renhui;Meng Shuang;Wang Zhengzhou;Li Lei;Zhang Ying;Jia Shuangfeng;Zhao Peili;Zheng He;Wang Jianbo
采用透射电镜研究了提取Na离子对层状结构na0.5 wo3.25的物相不稳定性。实时原子尺度观察表明：Na0.5WO3.25（三斜）→NaxWO3（立方）→WO3（单斜），具有特定的取向关系。Na0.5WO3.25/NaxWO3相边界的动态演化表明，Na0.5WO3.25将沿（100）t和（010）t切割，并分别为（101）c和（010）c的NaxWO3再结晶。根据这三个相的结构特征可以很好地解释相变途径。通过更好地理解在可能的层状结构正极材料中提取Na离子引起的相不稳定性，本工作为高性能Na离子电池的复杂策略设计提供了参考。
The phase instability in layered-structure Na0.5WO3.25induced by the extraction of Na ions was investigated by applying transmission electron microscopy. Real-time atomic-scale observation reveals the phase transition pathway: Na0.5WO3.25(triclinic) → NaxWO3(cubic) → WO3(monoclinic) with specific orientation relationships. The dynamic evolution of Na0.5WO3.25/NaxWO3phase boundaries shows that Na0.5WO3.25will cleave along the (100)Tand (010)Tand recrystallize as (101)Cand (010)Cof NaxWO3, respectively. The phase transition pathway can be well-explained according to the structural characteristics in the three phases. By better understanding of the phase instability induced by the extraction of Na ions in possible layered-structure cathode materials, this work provides a reference for the design of sophisticated strategies toward high-performance Na-ion batteries.