On stress-induced voltage hysteresis in lithium ion batteries: impacts of surface effects and interparticle compression

Chuan Jian Jin, Hao Liang Li, Yi Cheng Song, Bo Lu, A. K. Soh, Jun Qian Zhang

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

Application of silicon in high capacity electrodes of lithium ion battery suffers from stress effects and, in turn, affects voltage performance of battery. This paper established a reaction-diffusion-stress coupled model and investigated the stress induced voltage hysteresis with consideration of diffusion induced stress, surface effects and interparticle compression. It was found stress and stress induced voltage hysteresis depended on particle size. In big particles, diffusion induced stress is dominant and leads to significant hysteresis in both stress and voltage, indicating energy dissipation due to stress effects. In small particles, e.g., radius of dozens nanometers, diffusion induced stress was negligible while surface effects played dominant role, leading to nearly vanished voltage hysteresis shifting away from equilibrium potential. According to calculation, particle sizes around 100 nm are appropriate choice for electrode design as both diffusion induced stress and surface effects are insignificant. Finally, interparticle compression pushed the stress hysteresis to compressive side and led to early termination of lithiation at cut-off voltage. Denser electrode would enhance this effect. It indicated that there must be a limit of mixing ratio of silicon because higher interparticle compressive stress due to more introduced silicon would impede the battery from fully charged.

Original languageEnglish
Pages (from-to)1357-1364
Number of pages8
JournalScience China Technological Sciences
Volume62
Issue number8
DOIs
Publication statusPublished - Aug 2019

Keywords

  • interparticle compression
  • lithium ion battery
  • stress
  • surface effect
  • voltage hysteresis

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