All Solid State Lithium–Sulfur Battery Using a Glass-Type P2S5–Li2s Electrolyte

Lithium-sulfur battery has attracted great attention since its electrochemical process, i.e. 16Li + S8 = 8Li2S, theoretically provides a specific energy of 2500 Wh Kg-1 much larger than the 650 Wh Kg-1 of the conventional lithium battery presently offered by the market and largely used in the electronic devices. However, to realize the practical battery based on the sulfur cathode, its red-ox shuttle of polysulfide originated in the dissolution into the organic electrolyte is strongly required to prevent for improving the charge/discharge cycle ability. On the contrary, solid state sulfide electrolytes are of considerable practical concern in these days. Application of a solid-state ion conductor is one of promising candidates for avoiding the red-ox shuttle due to the dissolution of polysulfide in Li-S battery. Its applicability of Li2S-P2S5 based solid electrolyte to the sulfur cathode has been reported using Li-In alloy for the anode1). To obtain higher energy density, we adopted pure Li and verified its applicability to the all solid-state Li-S battery.