Alternative to Graphite, page-3

They have a long way to go to prove it up by the looks of it.

Unfortunately, as is the case with any technology, not all the news is good. The replacement of graphite with lithium in the anode makes the usual electrolytes used in lithium-ion batteries unusable so new electrolytes need to be developed. This has proved challenging, so for all its advantages, lithium-ion technology has yet to get out of the lab and before it does that, it needs to prove it can make batteries with lithium anodes last at least as long as the lithium-ion ones.