The performance of conventional lithium battery systems is limited by the fundamental capacities of both the cathode and anode used in these batteries. The best cathode materials in lithium ion batteries have a specific capacity of less than 200mAh/g. The most widely used anode material, graphitic or soft carbon, has a specific capacity of 372mAh/g. Metal/air batteries have a much larger specific energy than most of the available primary and rechargeable batteries. These batteries are unique in that the active cathode material (oxygen) is not stored in the battery. Oxygen from the environment is reduced at a catalytic air electrode surface forming either an oxide or peroxide ion that then reacts with cationic species in the electrolyte.Among various metal/oxygen batteries, Li/O2 couple is especially attractive because it has the potential of the highest specific energy (5,200Wh/kg) among all the known electrochemical couples. The specific energy of lithium air batteries is expected to be an order of magnitude larger than that achievable using conventional lithium or lithium ion batteries. Excellatron has expanded its technology base to lithium air batteries. Until now, commercialization of these batteries has been hindered by several problems such as corrosion and low capacity. The unique technology developed by Excellatron has overcome these problems and pushed Li/Air batteries closer to practical applications. Recently, we have successfully demonstrated the feasibility of a rechargeable lithium/oxygen battery, and Li/Air demonstration samples have been successfully delivered to a customer.