Hybrid Cellular Nanosheets for High-Performance Lithium-Ion Battery Anodes

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• 作者：Seung-Ho Yu ; Dong Jun Lee ; Mihyun Park ; Soon Gu Kwon ; Hyeon Seok Lee ; Aihua Jin ; Kug-Seung Lee ; Ji Eun Lee ; Myoung Hwan Oh ; Kisuk Kang ; Yung-Eun Sung ; Taeghwan Hyeon
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：137
• 期：37
• 页码：11954-11961
• 全文大小：627K
• ISSN：1520-5126

文摘

We report a simple synthetic method of carbon-based hybrid cellular nanosheets that exhibit outstanding electrochemical performance for many key aspects of lithium-ion battery electrodes. The nanosheets consist of close-packed cubic cavity cells partitioned by carbon walls, resembling plant leaf tissue. We loaded carbon cellular nanosheets with SnO₂ nanoparticles by vapor deposition method and tested the performance of the resulting SnO₂鈥揷arbon nanosheets as anode materials. The specific capacity is 914 mAh g^鈥? on average with a retention of 97.0% during 300 cycles, and the reversible capacity is decreased by only 20% as the current density is increased from 200 to 3000 mA g^鈥?. In order to explain the excellent electrochemical performance, the hybrid cellular nanosheets were analyzed with cyclic voltammetry, in situ X-ray absorption spectroscopy, and transmission electron microscopy. We found that the high packing density, large interior surface area, and rigid carbon wall network are responsible for the high specific capacity, lithiation/delithiation reversibility, and cycling stability. Furthermore, the nanosheet structure leads to the high rate capability due to fast Li-ion diffusion in the thickness direction.