All-solid-state batteries set for 2027 mass production, 400 Wh/kg

Toyota, Samsung SDI and BYD are all pointing investors and customers toward 2027 as a key year for all-solid-state batteries, but the companies are not all making the same claim. Toyota has said it is working toward commercialization in 2027-28, Samsung SDI says it aims for mass production in 2027, and BYD executives have described 2027 as the start of small-scale production rather than broad rollout. The social-media version of the story compresses those separate roadmaps into a single industry milestone. The source material shows a more uneven picture: one company is talking about commercialization, another about mass production, and a third about limited initial output. ### Are these companies actually saying the same thing about 2027? Toyota said in October 2023 that its work with Idemitsu was meant to “ensure the successful commercialization of all-solid-state batteries in 2027-28,” followed by full-scale mass production. (global.toyota) In October 2025, Toyota and Sumitomo Metal Mining repeated that Toyota was aiming for a market launch of battery EVs with all-solid-state batteries in 2027-28. Samsung SDI has used firmer manufacturing language. The company said in its newsroom and business materials that it supplied customer samples from its S-Line pilot facility in 2023 and aims to mass-produce all-solid-state batteries in 2027. BYD has not surfaced an equivalent official English-language newsroom post in the material reviewed here. China Daily, citing Sun Huajun, chief technology officer of BYD Lithium Battery, reported that BYD plans to begin small-scale production of sulfide-based all-solid-state batteries by 2027 and incorporate them into mainstream EV models by 2030. (global.toyota) ### Where does the 400 Wh/kg figure come from? (news.samsungsdi.com) Toyota’s official material reviewed here does not attach a 400 Wh/kg gravimetric energy-density figure to its all-solid-state battery roadmap. Toyota’s June 2023 battery presentation instead tied its next-generation “performance version” battery to a 1,000 km cruising range target for a 2026 battery EV, while separately discussing all-solid-state development. (global.chinadaily.com.cn) Samsung SDI’s published metric in the material reviewed here is volumetric, not gravimetric. The company said its all-solid-state battery has an energy density of 900 Wh/L, which it described as 40% higher than prismatic batteries currently in mass production. BYD’s 400 Wh/kg figure appears in secondary reporting tied to executive remarks and industry presentations, not in a BYD official release surfaced in this search. (global.toyota) China Daily verified the 2027 small-scale production target but did not include the 400 Wh/kg figure in the excerpt available here. Other secondary reports linked that number to BYD’s sulfide-based development program. (news.samsungsdi.com) ### What about the 1,000 to 1,500 kilometer range claims? Toyota has publicly tied a 1,000 km cruising range to a next-generation battery program unveiled at its June 2023 technical workshop, but that material does not show the same number as a confirmed all-solid-state production spec. The 1,500 km figure circulating online appears to come more from Chinese industry claims than from Toyota or Samsung SDI official materials. (global.chinadaily.com.cn) Secondary reports cited Chery and Changan discussing 400 Wh/kg cells with more than 1,500 km CLTC range, underscoring that range numbers are being mixed across different companies, chemistries and test cycles. ### What has each company actually built so far? (global.toyota) Samsung SDI said it launched its 6,500-square-meter S-Line pilot line in Suwon in March 2022 and supplied samples to customers in 2023. In March 2026, the company also said it would display a pouch-type all-solid-state sample for robotics while continuing prismatic development for electric vehicles. Toyota has focused on supply-chain and production preparation. (electrek.co) The company’s tie-ups with Idemitsu on solid electrolytes and with Sumitomo Metal Mining on cathode materials are both framed as steps toward 2027-28 commercialization and later mass production. Toyota also said in September 2024 that Japan’s Ministry of Economy, Trade and Industry certified its development and production plans for all-solid-state batteries. (news.samsungsdi.com) ### What should readers watch next? June 17, 2026 is Toyota’s next listed general shareholders’ meeting, and Samsung SDI continues to describe 2027 as its target year for all-solid-state mass production. BYD’s next concrete milestone, based on executive comments reported by China Daily, is small-scale sulfide-based production in 2027, with broader EV use targeted by 2030. (global.toyota 1) (global.toyota 2)