L 0522 (OTTO) Lithium sulphide, 99.9% Cas no 12136-58-2 - used in lithium-sulfur batteries. L 0522 (OTTO) Lithium sulphide, 99.9% Cas no 12136-58-2 - used as a cathode material in rechargeable lithium-sulfur batteries. L 0522 (OTTO) Lithium sulphide, 99.9% Cas no 12136-58-2 - used in batteries due to their high theoretical energy difference.