Nanoscale mechanics of the solid electrolyte interphase on lithiated-silicon electrodes
The∼ 300% volume changes of lithiated silicon electrodes (Li x Si) during electrochemical
cycling lead to cracking of the solid electrolyte interface (SEI). Here, we report how strain is
transferred from Li x Si to two primary inorganic SEI components: LiF and Li2O. Our first
principle calculations show that LiF, effectively bonded on Li x Si at x> 1, enables the entire
interface structure to deform plastically by forming delocalized stable voids. In contrast, Li2O
tightly bonded to Li x Si is stiffer, and deforms rigidly across all x. Our results explain the …
cycling lead to cracking of the solid electrolyte interface (SEI). Here, we report how strain is
transferred from Li x Si to two primary inorganic SEI components: LiF and Li2O. Our first
principle calculations show that LiF, effectively bonded on Li x Si at x> 1, enables the entire
interface structure to deform plastically by forming delocalized stable voids. In contrast, Li2O
tightly bonded to Li x Si is stiffer, and deforms rigidly across all x. Our results explain the …
[引用][C] Nanoscale Mechanics of the Solid Electrolyte Interphase on Lithiated-Silicon Electrodes
W Haoran, CH Beng - 2017
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