A Proposed General Solution for Li Dendrite Penetration into Solid Electrolytes Journal Article uri icon

Overview

abstract

  • We propose a general solution to the problem of Li dendrite penetration through solid electrolytes such as LLZO. The solution is based on an analogy of Li dendrite penetration to stress corrosion cracking, a process in which a very soft material--water--penetrates through a very hard material--steel--generally at grain boundaries. The problem of stress corrosion cracking was solved many years ago by putting the surface into a state of residual compressive stress. A variety of materials have been strengthened this way, including metals, glasses (e.g., Gorilla glass), and ceramics. However, for this approach to be useful, it is critical, at a minimum, that the presence of a significant residual compressive stress not block ion transport. In this work, we used DFT to show that isotropic compressive residual stresses as high as -10 GPa—the maximum observed in strengthened ceramics—have only a minimal impact on the diffusion rate of Li+ ions through a near-surface region of LLZO.; ; ; ; ; ; Figure 1;

publication date

  • November 23, 2020

has restriction

  • closed

Date in CU Experts

  • February 1, 2021 1:45 AM

Full Author List

  • Qi Y; Ban C; Harris SJ

author count

  • 3

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 2151-2043

Additional Document Info

start page

  • 876

end page

  • 876

volume

  • MA2020-02

issue

  • 5