Fangyi Shi, Chunhong Chen, Qi Qi, Ruijin Meng, Lyuchao Zhuang, Ziwei Yang, Duanzijing Liu, Zheng-Long Xu, Shu Ping Lau
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Optimal liquid sulfur deposition dynamics for fast-charging Li-S batteries
It is urgent to develop fast-charging batteries to eliminate the charging concerns when using electric vehicles. The fluid nature of liquid sulfur was found to enhance areal capacities and contribute to lithium-sulfur (Li-S) fast-charging batteries. However, the deposition kinetics of liquid sulfur in Li-S batteries remain underexplored. This study uses a micro-battery device to track the in-situ deposition of liquid sulfur on carbon film. Surprisingly, slower reaction and sulfur growth kinetics were observed even under high overpotential and high-conductivity substrates, indicating that excessive sulfur droplet formation impedes both reaction and growth kinetics. This insight guided the tailoring of carbon nanofiber cathodes, resulting in 94% capacity retention even with a significant increase in charging rate (from 1 C to 8 C). This research advances our understanding of liquid sulfur in Li-S batteries and provides guidance for designing high-performance, fast-charging cathodes.
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.