材料科学
阳极
法拉第效率
介孔材料
电解质
化学工程
电化学
硅
纳米技术
锂(药物)
锂离子电池
电极
电池(电)
光电子学
催化作用
有机化学
化学
工程类
内分泌学
物理化学
功率(物理)
物理
医学
量子力学
作者
Taeseung Yoon,Taesoo Bok,Chulhyun Kim,Younghoon Na,Soojin Park,Kwang S. Kim
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-05-03
卷期号:11 (5): 4808-4815
被引量:188
标识
DOI:10.1021/acsnano.7b01185
摘要
Controlling the morphology of nanostructured silicon is critical to improving the structural stability and electrochemical performance in lithium-ion batteries. The use of removable or sacrificial templates is an effective and easy route to synthesize hollow materials. Herein, we demonstrate the synthesis of mesoporous silicon hollow nanocubes (m-Si HCs) derived from a metal–organic framework (MOF) as an anode material with outstanding electrochemical properties. The m-Si HC architecture with the mesoporous external shell (∼15 nm) and internal void (∼60 nm) can effectively accommodate volume variations and relieve diffusion-induced stress/strain during repeated cycling. In addition, this cube architecture provides a high electrolyte contact area because of the exposed active site, which can promote the transportation of Li ions. The well-designed m-Si HC with carbon coating delivers a high reversible capacity of 1728 mAhg–1 with an initial Coulombic efficiency of 80.1% after the first cycle and an excellent rate capability of >1050 mAhg–1 even at a 15 C-rate. In particular, the m-Si HC anode effectively suppresses electrode swelling to ∼47% after 100 cycles and exhibits outstanding cycle stability of 850 mAhg–1 after 800 cycles at a 1 C-rate. Moreover, a full cell (2.9 mAhcm–2) comprising a m-Si HC-graphite anode and LiCoO2 cathode exhibits remarkable cycle retention of 72% after 100 cycles at a 0.2 C-rate.
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