Interconnected α-Fe₂O₃ nanosheet arrays as high-performance anode materials for lithium-ion batteries

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• 作者：Dandan Cai^a ; ^b ; ¹ ; Dongdong Li^a ; ^c ; ¹ ; Liang-Xin Ding^a ; ^{lxding@scut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Suqing Wang^a ; Haihui Wang^a ; ^c ; ^{hhwang@scut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Fe2O3 nanosheet arrays ; Galvanostatic electrodeposition ; Anode materials ; Lithium-ion batteries
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 February 2016
• 年：2016
• 卷：192
• 期：Complete
• 页码：407-413
• 全文大小：2037 K

文摘

The electrode materials with structure stability and binder-free are urgently required for improving the electrochemical performance of lithium-ion batteries. In this work, interconnected α-Fe₂O₃ nanosheet arrays directly grown on Ti foil were fabricated via a facile galvanostatic electrodeposition method followed by thermal treatment. The as-prepared α-Fe₂O₃ has an open network structure constituted of interconnected nanosheets and can be directly used as integrated electrodes for lithium-ion batteries. The α-Fe₂O₃ nanosheet arrays exhibit a high reversible capacity of 986.3 mAh g⁻¹ at a current density of 100 mA g⁻¹. Moreover, a reversible capacity of ca. 425.9 mAh g⁻¹ is achieved even at a superhigh current density of 10 A g⁻¹, which is higher than the theoretical capacity of commercially used graphite. The excellent performance could be attributed to the efficient electron transport, the large electrode/electrolyte interfaces and the good accommodations for volume expansion from the interconnected nanosheet arrays structure.