nn6b02727_si_001.pdf (3.11 MB)
Silicon Diphosphide: A Si-Based Three-Dimensional Crystalline Framework as a High-Performance Li-Ion Battery Anode
journal contribution
posted on 2016-05-31, 00:00 authored by Hyuk-Tae Kwon, Churl Kyoung Lee, Ki-Joon Jeon, Cheol-Min ParkThe
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.