There is actually an entire family of lithium-ion batteries that are in use in the mainstream world. Lithium-polymer and lithium-iron-phosphate are the most common in electric vehicles, but there are also lithium-cobalt batteries. The problem with these is not only the high price tag, but the fact that most of the weight of the batteries has nothing to do with the energy storage itself. Toyota has been doing extensive research and development on the next generation of all solid state and lithium-air batteries. Both types of batteries will catapult the world of energy storage into new realms.
The benefits of all solid state batteries have the potential for much higher performance and the technology itself brings a higher level of efficiency with less weight ratio. The Lithium-air batteries bring a theoretical potential capacity of energy storage to fifty times more than your average lithium-ion battery. The Lithium-air batteries actually use oxygen in the air as the active cathode material. They bring a much higher energy density as well as the additional weight savings.
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