Abstract
Silicon-based materials are considered the most promising anode materials for lithium-ion batteries (LIBs). However, due to the huge volume effect of Si powder during charging and discharging, the pulverization and peeling of silicon nanoparticles results in a certain amount of active material loss, which significantly affects the stability and coulombic efficiency of the battery. In this paper, a simple suspension mixing-freeze drying process was used to prepare a Si@Ti3C2Tx composite with a fluffy and porous structure, in which Si nanoparticles (SiNPs) are wrapped in a 3D conductive network of wrinkled and curled Ti3C2Tx nanosheets. Thus, both Si nanoparticle agglomeration and restacking of Ti3C2Tx nanosheets are inhibited, electrolyte penetration and charge transfer are facilitated, and Si nanoparticle volume expansion is effectively buffered. When used as an LIB anode, after 500 cycles and at a density of 1 A g?1, a high specific capacity of 1729 mAh g?1 and coulombic efficiency of ≥ 98.5% were achieved for Si@Ti3C2Tx, showing excellent electrochemical performance.
NSTL
Elsevier