Si@Ti3C2Tx with Si nanoparticles embedded in a 3D conductive network of crumpled Ti3C2Tx nanosheets for the anode of lithium-ion batteries with enhanced cycling performance

Zhiwen Wang, Dong Cao, Mingxi Ren, Hanning Zhang, Limei Pan, Chuanfang John Zhang, Jian Yang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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.

Original languageEnglish
Article number162037
JournalJournal of Alloys and Compounds
Volume892
DOIs
StatePublished - 5 Feb 2022

Keywords

  • Anode
  • Fluffy
  • Lithium-ion battery
  • MXene
  • Silicon

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