Effective bulk activation and interphase stabilization of silicon negative electrode by lithium pre-doping for next-generation batteries

Morihiro Saito, Kiyomi Kato, Shunya Ishii, Kazuki Yoshii, Masahiro Shikano, Hikari Sakaebe, Hisao Kiuchi, Toshiharu Fukunaga, Eiichiro Matsubara

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

To clarify the effects of Li pre-doping of a Si negative electrode for potential application in next-generation energy storage systems, such as Li-S and Li-O2 batteries, such electrodes were prepared by direct Li pre-doping using Li metal foil and by electrochemical pre-doping at 700 mA g−1 (Si) using a two-electrode cell. These were evaluated by comparing their charge/discharge properties, mainly by half-cell operation at a limited capacity of 2000 mAh g−1 (Si). Fluoroethylene carbonate (FEC) was added to form a stable solid electrolyte interphase film on the surface of the electrodes. The depth and homogeneity of Li pre-doping were improved by using the direct Li pre-doping method and by FEC addition, respectively. The rapid Li pre-doping of this method caused cracks and pulverization of the Si nanoparticles and promoted deep Li alloying by decreasing the Li+ diffusion distance. The tough homogeneous solid electrolyte interphase film derived from FEC suppressed electrolyte decomposition and enabled a fast Li alloying/de-alloying reaction. Addition of 10 mass% FEC to the half-cell electrolyte repaired damage to the interphase film caused by the large volume change of Si nanoparticles and improved cyclability to exceed 230 cycles.

Original languageEnglish
Pages (from-to)A5174-A5183
JournalJournal of the Electrochemical Society
Volume166
Issue number3
DOIs
Publication statusPublished - 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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