Sodiophilicity-Guided Interfacial Design for Horizontal Sodium Plating in Anode-Free Sodium Batteries
발표자
김승현 (포항공과대학교)
연구책임자
조길원 (포항공과대학교)
공동저자
김승현 (포항공과대학교), 박종환 (한국전기연구원), 조길원 (포항공과대학교)
초록
내용
To address the critical challenges of dendritic growth and low reversibility in anode-free sodium batteries, we propose a structured current collector that enables horizontal sodium plating through sodiophilicity-guided design. By vertically coating gold on periodically aligned carbon pillar arrays, we exploit the strong affinity between sodium and gold to direct nucleation and growth along the lateral pillar interfaces. The horizontally grown sodium fills the inter-pillar voids up to the pillar height, enabling a host volume matched to the target areal capacity. In this triphasic system composed of carbon, gold, and copper, we analyzed the initial sodium storage and plating behavior using cyclic voltammetry to elucidate the role of each component. Through this arrangement of materials with contrasting sodiophilicity, our strategy enables stable cycling over 600 hours at 5 mA cm-2 in half-cell configurations and demonstrates applicability in full-cell systems.