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학술지 Graphene Oxide Induced Surface Modification for Functional Separators in Lithium Secondary Batteries
Cited 27 time in scopus Download 8 time Share share facebook twitter linkedin kakaostory
김주영, 신동옥, 김광만, 오지민, 김주미, 강석훈, 이명주, 이영기
Scientific Reports, v.9, pp.1-7
Nature Publishing Group
18JB1600, 나노입자의 차원 제어를 통한 흑연/고체전해질 복합체 기반의 3차원 구조 음극 설계 및 조성 최적화, 이영기
Functional separators, which have additional functions apart from the ionic conduction and electronic insulation of conventional separators, are highly in demand to realize the development of advanced lithium ion secondary batteries with high safety, high power density, and so on. Their fabrication is simply performed by additional deposition of diverse functional materials on conventional separators. However, the hydrophobic wetting nature of conventional separators induces the polarity-dependent wetting feature of slurries. Thus, an eco-friendly coating process of water-based slurry that is highly polar is hard to realize, which restricts the use of various functional materials dispersible in the polar solvent. This paper presents a surface modification of conventional separators that uses a solution-based coating of graphene oxide with a hydrophilic group. The simple method enables the large-scale tuning of surface wetting properties by altering the morphology and the surface polarity of conventional separators, without significant degradation of lithium ion transport. On the surface modified separator, superior wetting properties are realized and a functional separator, applicable to lithium metal secondary batteries, is demonstrated as an example. We believe that this simple surface modification using graphene oxide contributes to successful fabrication of various functional separators that are suitable for advanced secondary batteries.
KSP 제안 키워드
Coating process, Eco-friendly, Graphene oxide(GOS), High Power density, Hydrophilic group, Ion transport, Ionic conduction, Lithium ion secondary batteries, Lithium secondary batteries, Modified separator, Polar solvent