Evidence for stepwise formation of solid electrolyte interphase in a Li-ion battery

نویسندگان

چکیده

Replacement of graphite with alloying and conversion materials, having high specific capacity, has emerged as versatile route to increasing the energy density Li-ion batteries. A key challenge is large volume change in these which leads an unstable solid electrolyte interphase (SEI). The use sacrificial additives, such fluoroethylene-carbonate (FEC), been established effective strategy for considerably improving cycling stability, but a mechanistic understanding underlying processes lacking so far. Here, we present in-depth chemical morphological study FEC-based on SnO2–graphite model electrodes. We found that FEC decomposition products aggregate first into spherical particles, whose growth depends cell medium follows laws crystal-growth theory, before forming continuous carbonate-rich film. discrimination composition FEC-derived particles from rest electrode was obtained by X-ray photoemission electron microscopy (XPEEM) due lateral resolution this technique. SEI formation fluorine-rich electrolytes should help guide future designs fluorine-based additives.

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ژورنال

عنوان ژورنال: Energy Storage Materials

سال: 2022

ISSN: ['2405-8297', '2405-8289']

DOI: https://doi.org/10.1016/j.ensm.2021.10.013