Sluggish Li2O2 Dissolution – A Key to Unlock High-Capacity Lithium-Oxygen Batteries

IF 7.6 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Lu He, Shuo Wang, Fengjiao Yu, Yuhui Chen
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引用次数: 0

Abstract

While lithium-oxygen batteries have a high theoretical specific energy, the practical discharge capacity is much lower due to the passivation of the solid discharge product, Li2O2, on the electrode surface. Herein, we studied and quantified the deposition and dissolution kinetics of Li2O2 using electrochemical quartz crystal microbalance (EQCM). It is found that the orientation of the electrode greatly influences the formation path and deposition amount of Li2O2. We identified two distinct dissolution modes: surface dissolution and bulk fragmentation, with the latter 100 times faster than the former. By revealing the underlying factors affecting dissolution, 80% of Li2O2 can dissolve within 3 minutes when a desorption potential of 2.9 V is applied. Consequently, we designed an intermittent-desorption discharge strategy, which increased the discharge capacity by an order of magnitude. This work shows that high practical specific energy of Li-O2 battery can be achieved once problems of Li2O2 dissolution are addressed.
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来源期刊
Chemical Science
Chemical Science CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
14.40
自引率
4.80%
发文量
1352
审稿时长
2.1 months
期刊介绍: Chemical Science is a journal that encompasses various disciplines within the chemical sciences. Its scope includes publishing ground-breaking research with significant implications for its respective field, as well as appealing to a wider audience in related areas. To be considered for publication, articles must showcase innovative and original advances in their field of study and be presented in a manner that is understandable to scientists from diverse backgrounds. However, the journal generally does not publish highly specialized research.
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