Uncorrelated Lithium-Ion Hopping in a Dynamic Solvent-Anion Network.

ABSTRACT: Lithium batteries rely crucially on fast charge and mass transport of Li⁺ in the electrolyte. For liquid and polymer electrolytes with added lithium salts, Li⁺ couples to the counter-anion to form ionic clusters that produce inefficient Li⁺ transport and lead to Li dendrite formation. Quantification of Li⁺ transport in glycerol-salt electrolytes via NMR experiments and MD simulations reveals a surprising Li⁺-hopping mechanism. The Li⁺ transference number, measured by ion-specific electrophoretic NMR, can reach 0.7, and Li⁺ diffusion does not correlate with nearby ion motions, even at high salt concentration. Glycerol's high density of hydroxyl groups increases ion dissociation and slows anion diffusion, while the

SUBMITTER: Yu D 

PROVIDER: S-EPMC10112391 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature