26 Feb '18, 10am

Researchers discover why adding carbon to new type of solid electrolyte improves diffusion #SSB

Researchers discover why adding carbon to new type of solid electrolyte improves diffusion #SSB

We propose that the broken symmetry of the anions introduced by C substitution has three primary effects: first, modification of the local static cation–anion interaction via introduction of an anion dipole; second, modification of the orientational preferences of the anions; and third, modification of the rotational dynamics of the anions on timescales accessible to diffusion. In each case, the C atom introduces a source of frustration that complicates the ability of the phase to order into a stable ordered structure, lowering the superionic transition temperature and enhancing cation diffusion. Our results point to the role of broken anion symmetry and atomic substitution as a more general strategy for enhancing thermal disorder and cation ionic conductivity in this emerging class of materials.

Full article: http://www.greencarcongress.com/2018/02/20180226-llnl.html

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