https://techcrunch.com/2021/02/24/can-solid-state-batteries-power-up-for-the-next-generation-of-evs/ > Lithium-ion batteries power almost every new phone, laptop and electric vehicle. But unlike processors or solar panels, which have improved exponentially, lithium-ion batteries have inched along with only incremental gains. > For the last decade, developers of solid state battery systems have promised products that are vastly safer, lighter and more powerful. Those promises largely evaporated into the ether — leaving behind a vapor stream of disappointing products, failed startups and retreating release dates.