Solid-State Battery
A solid-state battery (SSB) is a rechargeable cell that swaps the liquid electrolyte inside a conventional lithium-ion battery for a solid one. That change promises more energy in the same volume and a lower fire risk, which is why carmakers and Korea’s cell makers treat it as the prize for the next generation of electric vehicles.
What is a solid-state battery?
A normal lithium-ion cell shuttles ions through a flammable liquid electrolyte. A solid-state battery uses a solid electrolyte instead, a ceramic, polymer, or sulfide material, which can be denser and harder to ignite. The payoff is energy density: Samsung SDI targets an all-solid-state cell at 900 Wh/L, about 40% higher than the prismatic cells it makes today (Samsung SDI). The catch is timing. These are still being industrialized: Samsung SDI targets mass production in 2027 (electrive), and LG Energy Solution aims to commercialize graphite-based all-solid-state EV cells by 2029 (Seoul Economic Daily).
What can a solid-state battery actually do?
The Korean makers are not racing alone. Toyota, working with the oil group Idemitsu on sulfide solid electrolytes, has set the most aggressive public targets: it aims to commercialize an all-solid-state cell in 2027–28 that delivers up to a 1,200 km driving range with a charge time of 10 minutes or less (Toyota). For context, that range is roughly double what a typical liquid-electrolyte EV manages on a charge today, and the chemistry behind it reaches an energy density near 450–500 Wh/kg. Toyota frames the shift in plain terms:
“It means that the commercialization of solid-state batteries is a thing of the future that is now within reach.” — Toyota Motor Corporation, Idemitsu and Toyota Announce Beginning of Cooperation toward Mass Production of All-Solid-State Batteries
“Within reach” is the honest framing. The physics is proven at prototype scale, but mass production is the hard part, because sulfide electrolytes are sensitive to moisture and difficult to make in large, defect-free sheets at automotive volume. That manufacturing problem, not the cell concept, is what every late-decade timeline is really betting on, and it is why the announced dates keep landing in 2027 and beyond rather than today.
Why does the solid-state battery matter for investors?
It is the technology bet inside the Solid-State Batteries & Energy Storage theme. Whoever commercializes a reliable, affordable solid-state cell first could reset the EV battery hierarchy, but the late-decade timelines mean today’s revenue still comes from conventional cells and from grid battery energy storage systems.
Related terms & concepts
FAQ
Why is a solid-state battery better than lithium-ion?
Replacing the flammable liquid electrolyte with a solid one can raise energy density and cut fire risk. Samsung SDI targets an all-solid-state cell at 900 Wh/L, about 40% above its current prismatic cells (Samsung SDI).
When will solid-state batteries reach mass production?
Most timelines are late this decade. Samsung SDI targets mass production in 2027 (electrive), while LG Energy Solution aims to commercialize graphite-based all-solid-state EV cells by 2029 (Seoul Economic Daily).
What is an all-solid-state battery (ASB)?
An all-solid-state battery (ASB) uses a solid electrolyte throughout, with no liquid component, as opposed to semi-solid or hybrid designs. It is the form Korean cell makers such as Samsung SDI are racing to mass-produce (Samsung SDI).
Sources & references
- 900Wh/L All Solid Battery Becomes Reality · Samsung SDI, 2024-09-01
- Samsung SDI to start mass production of solid-state batteries in 2027 · electrive, 2024-03-05
- LG Energy Solution to Commercialize Solid-State EV Batteries by 2029 · Seoul Economic Daily, 2026-02-18
- Idemitsu and Toyota Announce Beginning of Cooperation toward Mass Production of All-Solid-State Batteries for BEVs · Toyota Motor Corporation, 2023-10-12