Kinetics of Lithium-Ion Transfer at the Interface between Li_4Ti_5O_(12) Thin Films and Organic Electrolytes

摘要

Kinetics of lithium-ion transfer at the interface between oxide-negative electrodes and organic electrolytes was studied using a Li_4Ti_5O_(12) thin-film electrode and ac impedance spectroscopy. We evaluated the activation energies of the interfacial lithium-ion transfer from the temperature dependences of the interfacial conductivities. When we used LiClO_4/PC and LiClO_4/EC+DMC as the electrolytes, the activation energies were 64 and 54 kJ mol~(-1), respectively. On the other hand, LiClO_4/DMC gave the activation energy of 37 kJ mol~(-1), which is much lower than those in PC and EC+DMC. The activation energies of the interfacial lithium-ion transfer depended on the solvation ability of solvents.