Flexible high-energy-density lithium-sulfur batteries using nanocarbon-embedded fibrous sulfur cathodes and membrane separators
- Authors
- Park, Jun-Woo; Jo, Seong-Chan; Kim, Min-Ju; Choi, Ik-Hyeon; Kim, Byung Gon; Lee, You-Jin; Choi, Hae-Young; Kang, Sung; Kim, TaeYoung; Baeg, Kang-Jun
- Issue Date
- 2-Apr-2021
- Publisher
- NATURE RESEARCH
- Citation
- NPG ASIA MATERIALS, v.13, no.1
- Journal Title
- NPG ASIA MATERIALS
- Volume
- 13
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/81503
- DOI
- 10.1038/s41427-021-00295-y
- ISSN
- 1884-4049
- Abstract
- To obtain soft electronics, it is essential to develop high-performance and mechanically flexible energy storage at the industry level. Herein, we report flexible high-energy-density lithium-sulfur (Li–S) batteries based on all-fibrous sulfur cathodes and separators. To implement free-standing and flexible sulfur cathodes, electrically conductive single-walled carbon nanotubes (CNTs) are impregnated with cellulose nanofibers. This fibrous structure forms a 3D porous electrode with a large surface area to improve redox kinetics and achieve a high sulfur loading content without the use of a metal collector, which can then be applied in high-energy-density batteries. These flexible sulfur cathodes are combined with a commercial glass fiber separator coated with a CNT layer through a cost-effective solution process to suppress the shuttle effects of lithium–polysulfide, thereby exhibiting robust cycling stability. The prepared Li–S batteries exhibit high capacities of 940 mAh g−1 at a charge current density of 1.57 mA cm−2 and at 25 °C, and the Coulombic efficiency exceeds 90% even after 50 charge/discharge cycles. Moreover, Li-S batteries with a high gravimetric energy density of 443 Wh kg−1 per cell is achieved, and these batteries demonstrate excellent reliability in regard to electrochemical performance even under severe mechanical stress conditions for over 100 cycles. © 2021, The Author(s).
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