Conduction in ionic organic plastic crystals: The role of defects

New insights into ordering and dynamics in organic ionic plastic crystal electrolytes

“…The ions within these domains show enhanced mobility, consistent with the NMR observations [14,15,22]. These disordered domains can be thought of as extended defects, the presence of which has also been suggested by positron annihilation spectroscopy [23][24][25]. In practice these defects could be merely the grain boundary regions or other domain boundaries that form within the OIPC.…”

A study of phase behavior and conductivity of mixtures of the organic ionic plastic crystal N-methyl-N-methyl-pyrrolidinium dicyanamide with sodium dicyanamide

“…For concentrations above 20 mol% Li[N(CN) 2 ], the conductivity did not show an increase over the pure OIPC for temperatures below 40°C, while two orders of magnitude increase was observed above 40°C in phase II for the lithium mixed system. Given that the eutectic temperature of the Li salt in pyrrolidinium-based mixtures occurs at~30°C [12,15,29,31], this is consistent with an enhanced conductivity contribution from a Li + -rich, liquid-like phase present in the material above this temperature. Similarly, in [C 1 mpyr][N(CN) 2 ] doped with LiI, a three orders of magnitude of enhanced conductivity was resulted from the increase in the mobility of matrix and the Li + cation [45].…”

“…[1,2,4,8,[11][12][13][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], were investigated mainly for electrolytes in batteries [38,39] and fuel cells [13] at ambient temperatures. In these materials, one of the most important properties is the significant transport of the target ion, such as the H + ion in fuel cells and Li + ion in Li batteries.…”

Is Universal, Simple Melting Point Prediction Possible?

“…[42] Defect concentrations are often assumed to be on the order of 0.1 %, [43] but might be much larger for soft lattices, even by one or two orders of magnitude. [44][45][46] A general study of defects in complex inorganic salts can be found in ref. [47].…”