气候变化领域集成服务门户(CCPortal): Reaction heterogeneity in practical high-energy lithium-sulfur pouch cells

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DOI	10.1039/d0ee02088e
	Reaction heterogeneity in practical high-energy lithium-sulfur pouch cells
	Shi L.; Bak S.-M.; Shadike Z.; Wang C.; Niu C.; Northrup P.; Lee H.; Baranovskiy A.Y.; Anderson C.S.; Qin J.; Feng S.; Ren X.; Liu D.; Yang X.-Q.; Gao F.; Lu D.; Xiao J.; Liu J.
发表日期	2020
ISSN	17545692
起始页码	3620
结束页码	3632
卷号	13 期号:10
英文摘要	The lithium-sulfur (Li-S) battery is a promising next-generation energy storage technology because of its high theoretical energy and low cost. Extensive research efforts have been made on new materials and advanced characterization techniques for mechanistic studies. However, it is uncertain how discoveries made on the material level apply to realistic batteries due to limited analysis and characterization of real high-energy cells, such as pouch cells. Evaluation of pouch cells (>1 A h) (instead of coin cells) that are scalable to practical cells provides a critical understanding of current limitations which enables the proposal of strategies and solutions for further performance improvement. Herein, we design and fabricate pouch cells over 300 W h kg-1, compare the cell parameters required for high-energy pouch cells, and investigate the reaction processes and their correlation to cell cycling behavior and failure mechanisms. Spatially resolved characterization techniques and fluid-flow simulation reveal the impacts of the liquid electrolyte diffusion within the pouch cells. We found that catastrophic failure of high-energy Li-S pouch cells results from uneven sulfur/polysulfide reactions and electrolyte depletion for the first tens of cycles, rather than sulfur dissolution as commonly reported in the literature. The uneven reaction stems from limited electrolyte diffusion through the porous channels into the central part of thick cathodes during cycling, which is amplified both across the sulfur electrodes and within the same electrode plane. A combination of strategies is suggested to increase sulfur utilization, improve nanoarchitectures for electrolyte diffusion and reduce consumption of the electrolytes and additives. © The Royal Society of Chemistry.
英文关键词	Additives; Diffusion; Electrodes; Electrolytes; Energy storage; Failure (mechanical); Flow of fluids; Lithium; Lithium batteries; Lithium compounds; Sulfur compounds; Analysis and characterization; Catastrophic failures; Characterization techniques; Electrolyte depletion; Energy storage technologies; Liquid electrolytes; Mechanistic studies; Spatially resolved; Lithium sulfur batteries
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189518
作者单位	Energy and Environmental Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, United States; Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, United States; Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109-2104, United States; Department of Geosciences, Stony Brook University, Stony Brook, 11794, United States; Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2104, United States; Materials Science and Engineering Department, University of Washington, Seattle, WA 980105, United States
推荐引用方式 GB/T 7714	Shi L.,Bak S.-M.,Shadike Z.,et al. Reaction heterogeneity in practical high-energy lithium-sulfur pouch cells[J],2020,13(10).
APA	Shi L..,Bak S.-M..,Shadike Z..,Wang C..,Niu C..,...&Liu J..(2020).Reaction heterogeneity in practical high-energy lithium-sulfur pouch cells.Energy & Environmental Science,13(10).
MLA	Shi L.,et al."Reaction heterogeneity in practical high-energy lithium-sulfur pouch cells".Energy & Environmental Science 13.10(2020).