The self-diffusion coefficients of the lithium ion (Li+) and the anion (PF6- and TFSA-) in single, binary, and ternary blends of the newly synthesized F1S3M2 silyl molecule (shown below) with ethyl carbonate (EC), ethyl methyl carbonate (EMC), and ?-valerolactone (GVL) were measured from 295 K to 345 K using the PGSTE (pulse-gradient stimulated spin-echo) NMR method to assess their potential for lithium-ion battery applications. Pure F1S3M2 electrolytes possess high Li transference numbers, but diffusion of both ions is significantly low when compared to standard carbonate blends. Binary solvent blends of F1S3M2 with EMC possess the highest Li diffusion and Li transference numbers, particularly the 1:1 and 2:8 F1S3M2/EMC blends, which have Li diffusion comparable to several pure carbonate blends, yet possess very high Li transference numbers. Ternary blends possess the lowest diffusion and Li transference numbers.

Pulse-gradient spin echo 7Li and 19F NMR diffusion measurements of 8 novel silyl-carbonate solvent-blend electrolytes containing LiPF6 and LiTFSA

247th National Meeting (2014)

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