Inheritance of Crystallographic Orientation during Lithiation/Delithiation Processes of Single-Crystal α-Fe2O3 Nanocubes in Lithium-Ion Batteries.
Inheritance of Crystallographic Orientation during Lithiation/Delithiation Processes of Single-Crystal α-Fe2O3 Nanocubes in Lithium-Ion Batteries.
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DOI：
10.1021/acsami.5b07547
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发表时间：
2015-10
影响因子：
9.5
通讯作者：
Xiaowei Ma;Manyu Zhang;C. Liang;Yuesheng Li;Jingjing Wu;R. Che
中科院分区：
文献类型：
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作者：
Xiaowei Ma;Manyu Zhang;C. Liang;Yuesheng Li;Jingjing Wu;R. Che
基于锂离子电池（LIB）转化反应，氧化铁是非常有前途的阳极材料。在转换过程中，电极材料的晶体结构和成分发生了巨大变化。令人惊讶的是，在我们的研究中，通过异位透射电子显微镜在单晶 α-Fe2O3 纳米立方体的锂化/脱锂过程中发现了晶体取向的遗传。单晶α-Fe2O3首先转化为嵌入Li2O基体中的大量Fe纳米颗粒，然后Fe和FeO纳米颗粒之间的转化成为储能的主要可逆电化学反应。有趣的是，这些Fe/FeO纳米颗粒具有几乎相同的晶体取向，表明锂化/脱锂产物可以继承单晶α-Fe2O3的晶体取向。这一发现对于理解铁氧化物的详细电化学转化过程非常重要，并且这一特征也可能存在于其他过渡金属氧化物的锂化/脱锂过程中。
Iron oxides are very promising anode materials based on conversion reactions for lithium-ion batteries (LIBs). During conversion processes, the crystal structure and composition of the electrode material are drastically changed. Surprisingly, in our study, inheritance of a crystallographic orientation was found during lithiation/delithiation processes of single-crystal α-Fe2O3 nanocubes by ex situ transmission electron microscopy. Single-crystal α-Fe2O3 was first transformed into numerous Fe nanograins embedded in a Li2O matrix, and then the conversion between Fe and FeO nanograins became the main reversible electrochemical reaction for energy storage. Interestingly, these Fe/FeO nanograins had almost the same crystallographic orientation, indicating that the lithiated/delithiated products can inherit the crystallographic orientation of single-crystal α-Fe2O3. This finding is important for understanding the detailed electrochemical conversion processes of iron oxides, and this feature may also exist during lithiation/delithiation processes of other transition-metal oxides.