Still, Li-ion batteries come with a suite of clear disadvantages. Capacity and ability to deliver peak charge deteriorates over time; they bleed a lot of heat and require weighty cooling systems to be integrated into their design, and the batteries can explode or catch fire if damaged in an accident thanks to the flammable liquid they contain.
Over the past few years, EV makers have been touting solid-state batteries as the next breakthrough in EV technology, often quoting insane performance and range. Solid-state batteries use a solid electrolyte that can take the form of ceramics, glass, sulfites or solid polymers as opposed to the liquid or polymer gel one found in conventional lithium-ion batteries. Solid-state batteries promise some two to ten times the energy density of lithium-ion batteries of the same size, thanks mainly to the solid electrolyte having a smaller footprint. That means more powerful batteries without extra space, or more compact battery packs without compromising on power, longer-range electric cars, and lighter EVs. They are also expected to charge faster.
In fact, solid-state batteries are often viewed as the “Holy grail” of sorts in the battery industry.