Application of Lithium Metal Electrodes to All-Solid-State Lithium Secondary Batteries Using Li[sub 3]PO[sub 4]-Li[sub 2]S-SiS[sub 2] Glass

The glass electrolyte exhibited instability against a Li metal electrode in the charge-discharge cycle using a positive electrode. The interface products between the Li electrode and the glass electrolyte were investigated by Si and S-K edge near-edge X-ray absorption fine structure analyses. It was suggested that and Si coordinated to three sulfur atoms formed after charge-discharge cycles. This side reaction could be suppressed by modifying the surface of Li metal by gas, leading to improvement of the charge-discharge property compared to unmodified Li electrode. The operating voltage attained to about 4 V in the modified glass electrolyte/ cell, which was comparable to Li-ion battery using a liquid electrolyte.