PEI/Super P Cathode Coating: A Pathway to Superior Lithium–Sulfur Battery Performanceopen access
- Authors
- Heo, Junhee; Min, Gyeonguk; Lee, Jae Bin; Kim, Patrick Joohyun; Shin, Kyuchul; Cheong, In Woo; Kang, Hyunchul; Yoon, Songhun; Lim, Won-Gwang; Lee, Jinwoo; Joo, Jin
- Issue Date
- Nov-2023
- Publisher
- Multidisciplinary Digital Publishing Institute (MDPI)
- Keywords
- lithium polysulfide; lithium–sulfur battery; modified cathode; polyethyleneimine; shuttle effect
- Citation
- Batteries, v.9, no.11
- Journal Title
- Batteries
- Volume
- 9
- Number
- 11
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/72172
- DOI
- 10.3390/batteries9110531
- ISSN
- 2313-0105
2313-0105
- Abstract
- Lithium–sulfur batteries exhibit a high energy density of 2500–2600 Wh/kg with affordability and environmental advantages, positioning them as a promising next-generation energy source. However, the insulating nature of sulfur/Li2S and the rapid capacity fading due to the shuttle effect have hindered their commercialization. In this study, we propose a method to boost the performance of lithium–sulfur batteries by modifying the sulfur cathode with a coating layer composed of polyethyleneimine (PEI) and Super P conductive carbon. The PEI/Super P-modified electrode retained 73% of its discharge capacity after 300 cycles at the 2 C scan rate. The PEI/Super P coated layer effectively adsorbs lithium polysulfides, suppressing the shuttle effect and acting as an auxiliary electrode to facilitate the electrochemical reactions of sulfur/Li2S. We analyzed the PEI/Super P-modified electrodes using symmetric cells, electrochemical impedance spectroscopy, and cyclic voltammetry. The battery manufacturing method presented here is not only cost-effective but also industrially viable due to its compatibility with the roll-to-roll process. © 2023 by the authors.
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