From ESS News
While lithium-ion batteries continue to improve in terms of both performance and cost, interest in solid-state batteries, which promise better energy density and safety, has not waned.
Geographically, solid state battery innovation is concentrated in a limited number of countries. According to Taipei-based intelligence provider TrendForce, China and South Korea were tailgating in commercialization behind Japan’s subsidy of over $660 million for all-solid-state batteries in 2024.
In the 2024 Battery Industry Strategy, Japan set a target of commercializing all-solid-state batteries (ASSB) by around 2030. By the end of last year, the Ministry of Economy, Trade and Industry (METI) approved a total of four major R&D projects on ASSB materials and production, including that of Toyota, Idemitsu, Mitsui Kinzoku, and TK Works.
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I think ypu are a little bit off in your research.
Chinese CATL has already release a Solid State Battery and are planning mass production by 2026 or 2027. So no Japan has not the lead, opposite they are quite behind CATL. Panasonic are being trying to release it for Tesla but still not there. CATL released it in 2024. But only small bateries. The biggest batteries will be later.