Solid-State Batteries Are Finally Here: What It Means for EVs

After years of being "just around the corner," solid-state battery technology has reached a genuine inflection point. Toyota announced mass production at its Himeji plant in January, while Samsung SDI is ramping up at its facility in South Korea. The implications for the EV industry are enormous.

What Are Solid-State Batteries?

Traditional lithium-ion batteries use a liquid electrolyte to move ions between electrodes. Solid-state batteries replace this liquid with a solid material—typically ceramic or glass. This fundamental change enables higher energy density, faster charging, improved safety, and longer lifespan.

The Numbers

Toyota's first-generation solid-state cells achieve an energy density of 500 Wh/kg—roughly double that of current lithium-ion cells. In practical terms, this means a vehicle with the same battery weight could achieve double the range, or the same range with half the battery weight (and cost).

Charging is equally impressive: 10-80% in under 10 minutes at compatible chargers. And the cells maintain over 90% capacity after 1,000 charge cycles, translating to roughly 300,000 miles of driving.

When Will You Be Able to Buy One?

Toyota plans to debut solid-state batteries in a new flagship EV sedan launching in late 2027, with broader rollout across their lineup by 2029. Samsung's cells will appear in Hyundai and BMW vehicles starting in 2028.

For the next 2-3 years, solid-state batteries will command a significant price premium. But as production scales, costs are expected to reach parity with lithium-ion by 2030.

Impact on the Used EV Market

The advent of solid-state batteries could accelerate depreciation of current-generation EVs, as buyers wait for the new technology. However, existing lithium-ion EVs remain excellent vehicles with plenty of life left in their batteries.