title: Control of interfacial layers for high-performance porous Si lithium-ion battery anode.
abstract: We demonstrate a facile synthesis of micrometer-sized porous Si particles via copper-assisted chemical etching process. Subsequently, metal and/or metal silicide layers are introduced on the surface of porous Si particles using a simple chemical reduction process. Macroporous Si and metal/metal silicide-coated Si electrodes exhibit a high initial Coulombic efficiency of ∼90%. Reversible capacity of carbon-coated porous Si gradually decays after 80 cycles, while metal/metal silicide-coated porous Si electrodes show significantly improved cycling performance even after 100 cycles with a reversible capacity of >1500 mAh g(-1). We confirm that a stable solid-electrolyte interface layer is formed on metal/metal silicide-coated porous Si electrodes during cycling, leading to a highly stable cycling performance.
authors.affiliation: School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50, Ulsan 689-798, Republic of Korea.
authors.forename: Hyungmin
authors.initials: H
authors.lastname: Park
authors.forename: Sungjun
authors.initials: S
authors.lastname: Lee
authors.forename: Seungmin
authors.initials: S
authors.lastname: Yoo
authors.forename: Myoungsoo
authors.initials: M
authors.lastname: Shin
authors.forename: Jieun
authors.initials: J
authors.lastname: Kim
authors.forename: Myungjin
authors.initials: M
authors.lastname: Chun
authors.forename: Nam-Soon
authors.initials: NS
authors.lastname: Choi
authors.forename: Soojin
authors.initials: S
authors.lastname: Park
keywords: interfacial coating layer; lithium-ion batteries; porous Si anode; solid electrolyte interphase; surface coating