A structural study on a specific Li-ion ordered complex in dimethyl carbonate-based dual-cation electrolytes.

Dimethyl carbonate (DMC) is a linear carbonate solvent commonly used as an electrolyte for electric double-layer capacitors (EDLCs) and Li-ion batteries. However, there are serious problems with the use of DMC as an electrolyte solvent: (1) low ionic conductivity when using Li salts ( LiBF) and (2) liquid-liquid phase separation when using spiro-type quaternary ammonium salts ( SBPBF). Dual-cation electrolytes, , bi-salt (SBPBF and LiBF) in DMC, are promising candidates to avoid the phase separation issue and to enhance the total and Li conductivities.