Geometrical engineering of a SPAN-graphene composite cathode for practical Li-S batteries
- Authors
- Kim, Hun; Hwang, Jang-Yeon; Bang, Sangin; Jung, Hun-Gi; Sun, Yang-Kook
- Issue Date
- May-2022
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.10, no.20, pp.10844 - 10853
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 10
- Number
- 20
- Start Page
- 10844
- End Page
- 10853
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/138643
- DOI
- 10.1039/d2ta01398c
- ISSN
- 2050-7488
- Abstract
- The realization of practical lithium-sulfur (Li-S) batteries is contingent on the development of innovative electrode designs having high energy, high power and a long lifespan. Herein, we propose a compact, high-performance, 2D sulfurized-polyacrylonitrile/graphene (2D-SPAN/G) cathode for practical Li-S batteries. A 2D-SPAN/G cathode with a high active-mass (sulfur) loading of 10 mg cm(-2) is successfully prepared via high-pressure pelletization. In the 2D-SPAN/G cathode, graphene nanosheets function as a robust and conductive scaffold, which uniformly encapsulates SPAN nanoparticles, providing structural integrity and enabling the high electrochemical utilization of sulfur. The combination of the stabilized lithium metal anode, a modified electrolyte (consisting of 1 M LiPF6 and 0.05 M LiDFOB in EMC : FEC (3 : 1 (v/v))) and a 2D-SPAN/G cathode delivers a high areal capacity of 11 mA h cm(-2) and demonstrates outstanding cycling stability over 300 cycles at a high current density of 4 mA cm(-2). Moreover, the excellent electrochemical performance of a scaled-up, pouch-type Li-S battery featuring a 2D-SPAN/G cathode demonstrates the viability of the proposed cathode. The reversibility of the Li+-ion storage mechanism of the 2D-SPAN/G cathode is confirmed using operando Raman spectroscopy.
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