CATL, the world’s largest EV battery manufacturer, has provided a candid update on its solid-state battery development. The company is targeting an energy density of 500 watt hours per kilogram, which could double or even triple the range of current electric vehicles. However, CATL confirmed that it is still working with 20 amp hour sample cells and plans only small batch production in 2027, with mass production further off.
CATL’s Solid-State Battery Progress
CATL told shareholders it has advanced from 10 amp hour test cells to 20 amp hour sample cells in its solid-state battery program. The company reiterated its goal of achieving 500 Wh/kg energy density, a figure that would represent a major leap over current lithium-ion phosphate (LFP) and nickel-based batteries. Despite this, CATL has not confirmed 500 Wh/kg as a production specification, and its chairman rates the technology at level four on a nine-point readiness scale.
Energy Density: What 500 Wh/kg Means
The 500 Wh/kg target is significant. Typical LFP cells offer about 160 to 190 Wh/kg, while the best nickel-based cells reach around 300 Wh/kg. CATL’s own chief scientist has stated that liquid electrolyte batteries hit a practical limit at 350 Wh/kg. If achieved, 500 Wh/kg would allow a battery of the same size as current packs to hold more than twice the energy, potentially doubling a car’s range from 500 to 1000 kilometers. For comparison, the BYD C-Line 7, a popular EV, uses a pack with about 170 Wh/kg—solid-state would nearly triple that figure.
Current Limitations and Timeline
The 20 amp hour samples CATL is testing are much smaller than the 100 to 300 amp hour cells typically used in production EVs. Chinese media reported CATL’s 20 amp hour sample trials as early as November 2024, and the company’s official update still references this size nearly two years later. CATL plans to begin small batch production in 2027, but the move to mass production is expected to take longer.
Industry Context and Competition
CATL is not alone in its timeline. Other major battery developers, including BLADE, Toyota, and Samsung SDI, are also targeting 2027 for their first solid-state cells. However, all indicate that mass production is more likely around 2030. The chemistry CATL is pursuing uses a sulfide-based solid electrolyte, likely paired with a nickel-rich cathode and possibly a lithium metal or anode-free design, which presents significant engineering challenges for durability and cycle life.
What This Means for Buyers and the Market
Sam Evans points out that while the promise of solid-state batteries is exciting, the technology is still several years from mass adoption. For now, conventional batteries continue to improve in cost, energy density, and performance, offering EV buyers practical benefits today. Sam believes that solid-state batteries will become a halo product in the early 2030s, but current EVs already provide enough range and longevity for most users. The industry will continue to innovate, but buyers should not expect solid-state breakthroughs to be widely available before the end of this decade.
