Abstract
In this study, we report a facile wet chemical synthesis method for preparing Li(7)P(3)S(11) solid-state electrolyte using ethyl propionate as the solvent. The structures of the samples were investigated using X-ray diffraction, Raman spectroscopy, and (31)P nuclear magnetic resonance. The electrochemical properties of the samples were evaluated using cyclic voltammetry, direct current, and alternating-current electrochemical impedance measurements. The Li(7)P(3)S(11) solid electrolyte (SE) exhibited a Li(+) conductivity of 1.5 × 10(-3) S cm(-1) at 25 °C. The electrochemical measurements confirmed that the synthesized electrolyte is a single Li(+) conductor with stability up to 5.0 V vs. Li(+)/Li. Furthermore, a solid-state battery (SSB) cell incorporating LiNi(1/3)Mn(1/3)Co(1/3)O(2) and the synthesized Li(7)P(3)S(11) maintained stability for up to 50 cycles, demonstrating the durability of Li(7)P(3)S(11) in high-voltage SSB applications. These results indicate that Li(7)P(3)S(11) SE is a promising candidate for rechargeable solid-state Li-ion batteries.