Lithium ion battery electric vehicles

Over the years we have seen some major developments in the electric vehicle market and now the lithium ion battery is the battery of choice for this particular sector. However, over the last few months we have seen significant developments in other areas of battery technology with many people now expecting a major flurry of new technology in the short to medium term.

We have the likes of the lithium air battery being developed in conjunction with IBM but what other developments in the battery technology market have caught your eye?