Modeling the nucleation and growth of Li at metal current collector/LiPON interfaces

Munekazu Motoyama, Makoto Ejiri, Yasutoshi Iriyama

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

The all-solid-state-lithium battery (SSLB) is a key technology to use Li metal anode with a theoretical capacity of 3860 mAhg-1 while suppressing the growth of Li dendrites. We present the model of Li nucleation on a solid-state electrolyte with metal current collector (CC)/lithium phosphorous oxynitride (LiPON) interfaces as the nucleation sites. We also observe the initial stage of Li growth and following Li dissolution using an in-situ scanning electron microscope (SEM) technique. The Li nucleation overpotential increases with increasing the Young's modulus of the CC. Also, the achievable Li particle sizes drastically increase with the Young's modulus of the CC. Our calculations show agreements with the experimental results and reveal that tensile stresses in a CC generate 10-1-100 GPa pressures on Li nuclei. Those pressures are three orders of magnitude larger than the ultimate tensile strength of bulk Li.

Original languageEnglish
Pages (from-to)A7067-A7071
JournalJournal of the Electrochemical Society
Volume162
Issue number13
DOIs
Publication statusPublished - 2015
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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