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Unveiling the mechanisms of lithium dendrite suppression by cationic polymer film induced solid-electrolyte interphase modification
Ist Teil von
Energy & environmental science, 2020-06, Vol.13 (6), p.1832-1842
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
It is crucial to suppress lithium dendrite formation in lithium metal batteries. Formation of a good solid-electrolyte interphase (SEI) has been considered to be effective in limiting lithium dendrite growth. However, how the SEI may be modified during lithium deposition is hard to resolve due to challenges in
in situ
investigation of the SEI with fine details. We report an
in situ
study that uncovers the lithium dendrite suppression mechanism arising from SEI modification by a poly(diallyldimethylammonium chloride) (PDDA) cationic polymer film, using electrochemical liquid cell transmission electron microscopy (TEM). Lithium nanogranules are obtained in the presence of the polymer film. Chemical mapping of the deposits provides remarkable details of the SEI on individual nanogranules. It shows that lithium fluorides are uniformly distributed within the inner SEI layer of individual lithium nanogranules, arising from the instantaneous reaction of the deposited lithium with PF
6
−
ions accumulated by the cationic polymer film, and thus the dendritic growth of lithium is prohibited. The ability to directly measure SEI chemistry at the nanoscale down to the individual nanograins
in situ
and unveil its correlation with the lithium deposition behavior opens future opportunities to explore unsolved mechanisms in batteries.
Lithium dendrite suppression mechanisms by a PDDA cationic polymer film were revealed through nanoscale chemical imaging of the solid-electrolyte interphase with
in situ
liquid cell TEM.