Effect of Nanodiamond Additives on the Ionic Conductivity of the (C2H5)3CH3NBF4 Organic Salt

The paper presents studies of the transport and electrochemical characteristics of solid composite electrolytes (1 – x )(C 2 H 5 ) 3 CH 3 NBF 4 – x C ND (where C ND is the UDA-С nanosized diamonds with S s = 300 ± 20 m 2 /g, 0 < x < 1). The addition of a nanodiamonds inert additive is shown to lead to an increase in the electrical conductivity of the composite electrolyte by 2 orders of magnitude up to 1.7 × 10 –3 S/cm at 200°C for x = 0.98. The theoretical dependences describe well the experimental data over the 0 < x < 0.98 concentration range at temperatures of 25–200°C. The stability of composite materials in a C/0.6(C 2 H 5 ) 3 CH 3 NBF 4 –0.4C ND /C cell was studied by cyclic voltammetry. The fundamental possibility of using the composite solid electrolytes with nanodiamonds additives in electrochemical devices is substantiated by the example of a C/0.6(C 2 H 5 ) 3 CH 3 NBF 4 –0.4C ND /C solid-state supercapacitor. Thus, it was demonstrated that nanodiamonds can be considered as an effective non-oxide additive in composite solid organic electrolytes used in electrochemical devices.