Abstract
Shear-thickening electrolytes are of increasing interest, as they offer potentially enhanced battery safety during extreme impact. Current shear-thickening electrolytes consist of a suspension of spherical nanoparticles in battery electrolyte media, but these tend to be effective only at high loadings and do not display discontinuous shear thickening. Accordingly, the present challenge is to maximize the shear-thickening effect at the lowest particle loading. Here, anisotropic silica nanorods with aspect ratios ranging from 2 to 24 are explored as alternatives to the current paradigm of spherical nanoparticles for shear-thickening electrolytes. As the aspect ratio increases, the critical volume fraction for shear thickening decreases. Discontinuous shear thickening in which solidification takes place is achieved by using nanorods of aspect ratio 24 at the relatively low volume fraction of 0.146. Interparticle attractions originating from the interaction between the nanorod’s solvation layer and the electr...
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