Gamma‑ray irradiated graphene nanosheets/polydopamine hybrids as a superior anode material for lithium‑ion batteries
(주)코리아스칼라
- 최초 등록일
- 2023.05.08
- 최종 저작일
- 2022.02
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon letters / 32권 / 1호
ㆍ저자명 : Kyoung‑Il Jo, Hyeri Kim, Hee‑Sung Jeong, Jinho Kee, Seung‑Hwan Oh, Seok Hyun Song, Hyungsub Kim, Jaseung Koo
목차
Abstract
1 Introduction
2 Experimental procedure
2.1 Material
2.2 Anode material and γ-ray irradiation
2.3 Electrochemical tests of irradiated GO–PDA–PEI electrodes
3 Results and discussion
4 Conclusion
Acknowledgements
References
영어 초록
Despite having a low electrical conductivity, graphene oxide (GO) is used as an anode material in lithium-ion batteries (LIBs) owing its good processability in large quantities. GO is reduced by chemical or thermal treatments to enhance its electrical conductivity. In this study, high-performance GO anodes with polydopamine (PDA) and polyethylenimine (PEI) as binders were fabricated. Gamma (γ)-ray irradiation was applied to the GO–PDA–PEI hybrid sheets to covalently cross-link the GO sheets and binders with an amide bond. The covalent crosslinking was confirmed by Fourier-transform infrared spectroscopy analysis. Further, X-ray photoelectron spectroscopy results showed that γ-ray irradiation produced a reduced GO sheet, which resulted in an increase in the electrical conductivity by 30%. By characterizing the electrochemical properties, we found that the γ-ray irradiation facilitates the stability and increases the charge/discharge capacity by crosslinking GO and PDA–PEI binders and reducing the GO sheets.
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