This comes from an article in my newspaper today written by Peter Douglas, titled "Toyota May Be First to Deploy a Solid-State Battery". His article quotes another article in Nikkei Asia that was boasting that Toyota has developed a solid-state battery and will unveil a prototype next year. The Nikkei Asia article claims that "Toyota plans to be the first company to sell a vehicle equipped with a solid-state battery in the early 2020's". Nikkei Asia says that Toyota has taken out over 1,000 patents related to solid-state batteries, more than any other company.