To date, there are some interesting areas of research that could provide the potential for booting Li-on of its throne. The growth in electronics over the last century shows that the need for a long-lasting and sustainable battery is ever more pressing.
Other industries are also driving the impetus to get this sorted out as soon as possible. Electrical vehicles, in particular, will put even more pressure on dwindling natural resources and compound the already questionable practices employed in producing Lithium-ion batteries today.
Bearing that in mind, the following 4 areas of research could pave the way for a more long-lasting and sustainable battery of the future. There are many more projects out there, but these are some of the more promising.