Electrochemical Analysis of Li[sub 4]Ti[sub 5]O[sub 12] Electrode in All-Solid-State Lithium Secondary Batteries

All-solid-state cells using the solid electrolyte were assembled to investigate their rate performances and impedance behaviors. Furthermore, cells using dissolved in ethylene carbonate and diethyl carbonate were fabricated for comparison to the all-solid-state cells. In the all-solid-state cells, resistance attributable to the lithium-ion transfer from the solid electrolyte to spinel phase was observed during the lithium insertion into spinel phase during the discharge process. Results clarified that the cells using the solid electrolyte showed higher resistance and larger activation energy for this lithium-ion transfer than the cells using the liquid electrolyte. Resistance was not observed in the charge process. The all-solid-state cell showed the average charge voltage of (vs Li) and reversible capacity of at the charge current density of and the discharge current density of .