Cu3Si-doped porous-silicon particles prepared by simplified chemical vapor deposition method as anode material for high-rate and long-cycle lithium-ion batteries

Jae Young Woo, A. Young Kim, Min Kyu Kim, Sang-Hyup Lee, Yang Kook Sun, Guicheng Liu, Joong Kee Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

To provide a possible proposal for the large-scale production of a high performance silicon-based anode material in the lithium battery industry, a Cu3Si nanoparticle doped porous-silicon particles was prepared via a simplified chemical vapor deposition (CVD) process and heat treatment for the first time. In this work, the Cu3Si doping content was optimized by discharge/charge, transmission electron microscopy and electrochemical impedance spectroscopy tests. The results show that compared with the porous-silicon (PS) particles, the Cu3Si doping significantly enhanced the discharge capacity, coulombic efficiency, capacity retention, and high-rate performance of the silicon-based anode. The optimum performance with a discharge capacity of 3036.4 mA h g−1and a coulombic efficiency of 90.49% at the first cycle (after the first three formation cycles) and a capacity retention of 58.72% after 100 cycles occurred at a Cu3Si doping content of 2 wt%. The reasons for this are as follows: the PS particles with a similarly silicon nanorod structure accommodated the volume change to maintain the mechanical stability of the electrode during the cycling process; during the simplified CVD process, the nanostructure of silicon was retained; the high conductivity due to Cu3Si doping decreased the formation resistance of the solid-electrolyte interphase (SEI) film and enhanced the diffusion coefficient of Li+inside the silicon-based material; both fewer Cu3Si doping and aggregation particles resulting from excessive Cu3Si doping yielded insufficient electrical conductivity and decreased the formation resistance of the SEI film for the silicon-based material.

Original languageEnglish
Pages (from-to)425-432
Number of pages8
JournalJournal of Alloys and Compounds
Volume701
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Keywords

  • Anode material
  • CuSi doping
  • Lithium-ion batteries
  • Porous silicon particles
  • Simplified CVD method

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Cu<sub>3</sub>Si-doped porous-silicon particles prepared by simplified chemical vapor deposition method as anode material for high-rate and long-cycle lithium-ion batteries'. Together they form a unique fingerprint.

  • Cite this