Phase evolution and structural modulation during in situ lithiation of MoS₂, WS₂ and graphite in TEM.

ABSTRACT: Li-ion batteries function by Li intercalating into and through the layered electrode materials. Intercalation is a solid-state interaction resulting in the formation of new phases. The new observations presented here reveal that at the nanoscale the intercalation mechanism is fundamentally different from the existing models and is actually driven by nonuniform phase distributions rather than the localized Li concentration: the lithiation process is a 'distribution-dependent' phenomena. Direct structure imaging of 2H and 1T dual-phase microstructures in lithiated MoS₂ and WS₂ along with the localized chemical segregation has been demonstrated in the current study. Li, a perennial challenge for the TEM, is detected and imaged using a low-dose, direct-electron detection

SUBMITTER: Ghosh C 

PROVIDER: S-EPMC8079398 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature