A battery that uses a solid electrolyte. Solid state batteries are expected to be the next advance in batteries because they require less built-in safety technology than liquid electrolytes, which are flammable. As a result, solid state batteries are more compact, have longer battery life and recharge more quickly.
Although the technology has been around for years, it has been incredibly expensive to produce, even though the components are easier to put together. However, research and development in the 2010s continue to lower the price, and solid state batteries are expected to power electric cars in the 2020s. See electrolyte
Liquid vs. Solid State
Liquid electrolyte batteries are more complicated to make because the cathode and anode must float within the electrolyte (the substance that oozes out of old batteries). Solid electrolyte batteries can be manufactured flatter and easier.