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학술지 Restacked nanohybrid graphene layers with expanded interlayer distance enabled by inorganic spacer for highly efficient, flexible Na-ion battery anodes
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저자
신동옥, 임준원, 이명주, 김주영, 오지민, 강석훈, 김광만, 이영기
발행일
202104
출처
Journal of Electroanalytical Chemistry, v.886, pp.1-9
ISSN
1572-6657
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.jelechem.2021.115137
협약과제
21ZB1200, ICT 소재·부품·장비 자립기술 및 도전기술 개발, 이정익
초록
Here, we demonstrate a novel synthetic route to prepare restacked nanohybrid graphene layers (NHGLs) with the expanded interlayer distance enabled by incorporating inorganic spacer for the reliable high-capacity sodium-ion battery (NIB) anodes. Nanohybrid graphene oxide flakes (NHGOFs) were obtained through partial complexation of metallic Sn cation with graphene oxides (GOs) exfoliated from graphite. Negatively charged NHGOFs were restacked parallel to Zn substrate through an electrostatic interaction with Zn in an acidic solution. After detachment and freeze-drying step, NHGLs with the expanded interlayer distance of ~ 7.54 횇 along the c-axis supported by metallic Sn cation spacer were achieved. To clarify the beneficial effect of the expanded interlayer distance, electrochemical performances of NHGLs anode were investigated. Finally, a flexible feature of restacked NHGLs anode was presented during a simple bending test using a pouch-type cell.
키워드
Expanded interlayer distance, Nanohybrid graphene layers, Restacking process, Sodium-ion batteries
KSP 제안 키워드
C-axis, Electrochemical performance, Electrostatic interaction, Graphene layer, Graphene oxide(GOS), High-capacity, Na-ion battery, Negatively charged, Synthetic route, Zn substrate, acidic solution