Understanding the Degradation of a Model Si Anode in a Li-Ion Battery at the Atomic Scale.

ABSTRACT: To advance the understanding of the degradation of the liquid electrolyte and Si electrode, and their interface, we exploit the latest developments in cryo-atom probe tomography. We evidence Si anode corrosion from the decomposition of the Li salt before charge-discharge cycles even begin. Volume shrinkage during delithiation leads to the development of nanograins from recrystallization in regions left amorphous by the lithiation. The newly created grain boundaries facilitate pulverization of nanoscale Si fragments, and one is found floating in the electrolyte. P is segregated to these grain boundaries, which confirms the decomposition of the electrolyte. As structural defects are bound to assist the nucleation of Li-rich phases in subsequent lithiations and accelerate the electrolyte's de

SUBMITTER: Kim SH 

PROVIDER: S-EPMC9486947 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature