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

Journal of the American Chemical Society
Seung-Ho YuTaeghwan Hyeon

Abstract

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-carbon nanosheets as anode materials. The specific capacity is 914 mAh g(-1) 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(-1). 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.

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Citations

Nov 6, 2015·ACS Applied Materials & Interfaces·Seung-Ho YuYung-Eun Sung
Oct 11, 2016·Chemical Communications : Chem Comm·Min-Kun KimYung-Eun Sung
Feb 2, 2019·Chemical Communications : Chem Comm·Yinlin TongQingyi Lu
Jun 17, 2021·Chemical Communications : Chem Comm·Li SuJianping Yang
Dec 11, 2020·Nano Letters·Grayson L JacksonHeinrich M Jaeger
Nov 13, 2018·Journal of the American Chemical Society·Dae-Hyeok LeeTaeghwan Hyeon

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