Influence of Gold Nanoparticles Anchored to Carbon Nanotubes on Formation and Decomposition of Li2O2 in Nonaqueous Li鈥揙2 Batteries

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• 作者：Wugang Fan ; Xiangxin Guo ; Dongdong Xiao ; Lin Gu
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 10, 2014
• 年：2014
• 卷：118
• 期：14
• 页码：7344-7350
• 全文大小：420K
• 年卷期：v.118,no.14(April 10, 2014)
• ISSN：1932-7455

文摘

Gold nanoparticles (AuNPs) anchored to vertically aligned carbon nanotubes (VACNTs) act as additional nucleation sites for the Li₂O₂ growth, leading to the decreased size while increased density of Li₂O₂ particles in process of discharge. Correspondingly, at the deep discharge to 2.0 V the batteries show increased specific capacity. Upon charge, the AuNPs exhibit promotion effect on the Li₂O₂ decomposition by improving the conduction property of the discharge-formed particles, rather than by imposing the conventional electrocatalytic effect on the oxygen evolution reaction. Moreover, the AuNPs show promotion effect on decomposition of carbonate species arising from the side reactions. These effects consequently lead to the reduced charge overpotentials and extended cycle operation of the batteries. The results here provide a new as well as clear picture on the role of incorporated AuNPs in the Li₂O₂ formation and decomposition, which would be helpful for better understanding and constructing of high-performance air cathodes.