India-based Log 9 Materials is working graphene-based metal-air batteries, that in theory may even lead to electric vehicles that run on water.
The metal air batteries use a metal as anode, air (oxygen) as cathode and water as an electrolyte. A graphene rod is used in the air cathode of the batteries. Since Oxygen has to be used as the cathode, the cathode material has to be porous to let the air pass, a property in which graphene excels. According to Akshay Singhal, co-founder of Log 9 Materials, the graphene used in the electrode is able to increase the battery efficiency by five times at one-third the cost.