Minimizing the Electrolyte Volume in Li-S Batteries: A Step Forward to High Gravimetric Energy Density
- Authors
- Agostini, Marco; Hwang, Jang-Yeon; Kim, Hee Min; Bruni, Pantaleone; Brutti, Sergio; Croce, Fausto; Matic, Aleksandar; Sun, Yang-Kook
- Issue Date
- Sep-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- lithium-sulfur battery with reduced electrolyte volume; Li-ion batteries; low cost lithium batteries; nanostructured sulfide/fiber electrodes; practical and high energy storage systems
- Citation
- ADVANCED ENERGY MATERIALS, v.8, no.26, pp.1 - 7
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 8
- Number
- 26
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191511
- DOI
- 10.1002/aenm.201801560
- ISSN
- 1614-6832
- Abstract
- Sulfur electrodes confined in an inert carbon matrix show practical limitations and concerns related to low cathode density. As a result, these electrodes require a large amount of electrolyte, normally three times more than the volume used in commercial Li-ion batteries. Herein, a high-energy and high-performance lithium-sulfur battery concept, designed to achieve high practical capacity with minimum volume of electrolyte is proposed. It is based on deposition of polysulfide species on a self-standing and highly conductive carbon nanofiber network, thus eliminating the need for a binder and current collector, resulting in high active material loading. The fiber network has a functionalized surface with the presence of polar oxygen groups, with the aim to prevent polysulfide migration to the lithium anode during the electrochemical process, by the formation of S-O species. Owing to the high sulfur loading (6 mg cm(-2)) and a reduced free volume of the sulfide/fiber electrode, the Li-S cell is designed to work with as little as 10 mu L cm(-2) of electrolyte. With this design the cell has a high energy density of 450 Wh kg(-1), a lifetime of more than 400 cycles, and the possibility of low cost, by use of abundant and eco-friendly materials.
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