Structure and growth law of the battery solid-electrolyte interphase · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Structure and growth law of the battery solid-electrolyte interphase
Plain
In lithium-ion batteries the electrolyte partly decomposes on the negative electrode and forms a thin film, the solid-electrolyte interphase, which passes lithium ions but blocks electrons. Its structure and why it keeps slowly thickening set battery lifetime but are known only roughly.
Precise · changed · core
Revision 1: For graphite and lithium-metal anodes in carbonate electrolytes (for example 1 mol/L LiPF6 in ethylene carbonate and ethyl methyl carbonate), determine the nanoscale arrangement of inorganic (LiF, Li2CO3, Li2O) and organic phases in the solid-electrolyte interphase (SEI), the transport process that sustains its growth (electron tunneling, neutral lithium interstitial diffusion, solvent diffusion through pores), and the resulting thickness law $L(t)$, often reported near $t^{1/2}$. An answer is a model with first-principles rate parameters that predicts $L(t)$ and the measured calendar-aging capacity loss.
Revision 2: For graphite and lithium-metal anodes in carbonate electrolytes (for example 1 mol/L $\mathrm{LiPF_6}$ in ethylene carbonate and ethyl methyl carbonate), determine the nanoscale arrangement of inorganic (LiF, $\mathrm{Li_2CO_3}$, $\mathrm{Li_2O}$) and organic phases in the solid-electrolyte interphase (SEI), the transport process that sustains its growth (electron tunneling, neutral lithium interstitial diffusion, solvent diffusion through pores), and the resulting thickness law $L(t)$, often reported near $t^{1/2}$. An answer is a model with first-principles rate parameters that predicts $L(t)$ and the measured calendar-aging capacity loss.
Settled by
Cryogenic microscopy and depth-resolved spectroscopy of SEI composition over aging time, matched by a first-principles growth model.
Kind
phenomenon
Answer type
mechanism
References
(empty)
Literature status
open
Status note
(empty)
Posed since
(empty)

Decisions