期刊
ACS NANO
卷 14, 期 3, 页码 3281-3289出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b08844
关键词
symmetrical lithium-oxygen batteries; free-standing; all-metal structure; Li metal anode; carbon free cathode
类别
资金
- National Natural Science Foundation of China [51771177, 51972141]
- 111 Project [B17020]
- Education Department of Jilin Province [JJKH20190113KJ]
- Jilin Province Science and Technology Development Program [20190303104SF]
- Jilin Province/Jilin University Coconstruction Project-Funds for New Materials [SXGJSF2017-3]
A number of inherent and thorny obstacles still stand in the way of the practical application of Li-O-2 batteries, which require development of an advanced lithium anode and O-2 cathode. Herein, the strategy of a symmetrical Li-O-2 battery is presented. Specifically, Cu nanoneedle arrays with a nanoengineered Au coating are grown directly on a Cu foam substrate (Au/Cu@FCu), which can act as both the anode backbone and the cathode in a Li-O-2 battery. The excellent conductivity, high porosity, large specific surface, and superior lithiophilicity as well as high catalytic activity of the Au/Cup FCu electrodes can simultaneously regulate the deposition behavior of the lithium metal in the anode and catalyze the formation/decomposition of Li2O2 in the cathode. As a result, the Li uniformly deposited on the Au/Cu@FCu anode without Li dendrites, showing a high Coulombic efficiency over 96% and a long and stable cycle lifetime over 970 h. At the same time, the Au/CupFCu cathode demonstrates extremely low overpotentials (0.64 V) and a much higher specific capacity of 27 270 mAh g(-1) compared to the Li-O-2 batteries with a carbon-free cathode reported to date. Moreover, the ebb and flow phenomenon of the anode and cathode morphology is also observed in the Li-O-2 battery.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据