Tell HN: I think I found Toyota's battery 173 by scythe | 29 comments on Hacker News. Recently there was a thread about a "breakthrough" in battery technology at Toyota. https://ift.tt/0xc9Iv7 Toyota has been putting out PR puff pieces about their "solid-state" (solid-electrolyte) batteries for years, but this story was unique in that it had a quote from Keiji Kaita, who holds some high-level role at Toyota. Anyway, I didn't think much of it, because there was no paper referenced in the Guardian article, which seemed to be the original source. But while reading about something else, I came across the paper "A near dimensionally invariable high-capacity positive electrode material", published in Nature Materials last December: https://ift.tt/vjJDNaL This paper, reporting a cathode that has very little (much less than normal) change in size or shape when charged and discharged, claims reversible storage with a solid electrolyte. It stands to reaso...