Researchers in the UK are developing a rechargeable lithium-air battery that could deliver a ten-fold increase in energy capacity compared to that of currently available lithium-ion cells. The research work, funded by the Engineering and Physical Sciences Research Council (EPSRC), is being led by researchers at the University of St Andrews with partners at Strathclyde and Newcastle.
Lithium-air batteries use a catalytic air cathode in combination with an electrolyte and a lithium anode. Oxygen from the air is the active material for the cathode and is reduced at the cathode surface. An issue with Li-air batteries can be the accumulation of solid reaction products on the electrode, which blocks the contact between electrolyte and air.
The project addresses a number of the materials issues necessary to realize this high energy storage battery based on a non-aqueous O2 electrode. During the project, the team has so far more than tripled the capacity to store charge in the STAIR (St Andrews Air) cell.
The project is focused on understanding more about how the chemical reaction of the battery works and investigating how to improve it. The research team is also working towards making a STAIR cell prototype suited, in the first instance, for small applications, such as mobile phones or MP3 players.
– from greencarcongress