title: Silicon Diphosphide: A Si-Based Three-Dimensional Crystalline Framework as a High-Performance Li-Ion Battery Anode.
abstract: The development of an electrode material for rechargeable Li-ion batteries (LIBs) and the understanding of its reaction mechanism play key roles in enhancing the electrochemical characteristics of LIBs for use in various portable electronics and electric vehicles. Here, we report a three-dimensional (3D) crystalline-framework-structured silicon diphosphide (SiP2) and its interesting electrochemical behaviors for superior LIBs. During Li insertion in the SiP2, a three-step electrochemical reaction mechanism, sequentially comprised of a topotactic transition (0.55-2 V), an amorphization (0.25-2 V), and a conversion (0-2 V), was thoroughly analyzed. On the basis of the three-step electrochemical reaction mechanism, excellent electrochemical properties, such as high initial capacities, high initial Coulombic efficiencies, stable cycle behaviors, and fast-rate capabilities, were attained from the preparation of a nanostructured SiP2/C composite. This 3D crystalline-framework-structured SiP2 compound will be a promising alternative anode material in the realization and mass production of excellent, rechargeable LIBs.
authors.affiliation: School of Materials Science and Engineering, Kumoh National Institute of Technology , 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea.
authors.forename: Hyuk-Tae
authors.initials: HT
authors.lastname: Kwon
authors.affiliation: School of Materials Science and Engineering, Kumoh National Institute of Technology , 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea.
authors.forename: Churl Kyoung
authors.initials: CK
authors.lastname: Lee
authors.affiliation: Department of Environmental Engineering, Inha University , 100 Inha-ro, Nam-gu, Incheon 22212, Republic of Korea.
authors.forename: Ki-Joon
authors.initials: KJ
authors.lastname: Jeon
authors.affiliation: School of Materials Science and Engineering, Kumoh National Institute of Technology , 61 Daehak-ro, Gumi, Gyeongbuk 39177, Republic of Korea.
authors.forename: Cheol-Min
authors.initials: CM
authors.lastname: Park
keywords: anode materials; lithium-ion batteries; phosphorus-based compounds; silicon phosphide; silicon-based compounds