Inheritance of Crystallographic Orientation during Lithiation/Delithiation Processes of Single-Crystal 伪-Fe2O3 Nanocubes in Lithium-Ion Batteries

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• 作者：Xiaowei Ma ; Manyu Zhang ; Chongyun Liang ; Yuesheng Li ; Jingjing Wu ; Renchao Che
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：7
• 期：43
• 页码：24191-24196
• 全文大小：442K
• ISSN：1944-8252

文摘

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 伪-Fe₂O₃ nanocubes by ex situ transmission electron microscopy. Single-crystal 伪-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 伪-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.