슬러리 기반 공정에 의한 리튬 금속 배터리 용 다공성 제어 탄소 기반 3D 양극 연구

Abstract

Lithium (Li) metal batteries (LMB) are gaining attention due to their theoretically high energy density compared to current lithium ion batteries (LIB). Lithium-metal anodes are known to be the most promising for achieving high storage capacities and high cell voltages. Nevertheless, LMB is not yet commercialized due to poor cycling performances and the fatal safety issues coming from Li dendrite growth generated during repeated plating/stripping process. In this study, a three-dimensional (3D) porous electrode using a conventional slurry-based process for manufacturing LIB is proposed to suppress the growth of lithium dendrites by reducing the local current density of the anode for LMB. The slurry for 3D porous carbon electrode, was composed of an active material (carbon), a binder (PAI), and a pore-forming agent (PMMA), and can be fabricated by the facile drying process. In a result, nucleation overpotential of as-prepared 3D porous electrode is reduced compared to Cu foil and the plating/stripping of lithium is reversibly progressed inside the pores without lithium deposition on the surface, which is supported by cross-sectional SEM images and XPS analysis of Li platted and stripped electrode. Cycle performances of half cell and full cell showed that as-prepared 3D porous carbon electrode is superior to 2D Li metal, or Cu foil.