E-Power Inc. (NASDAQ: EPOW) has been granted Chinese Patent CN2024105182226 for a double-layer coated silicon-carbon composite material, a key anode technology for next-generation solid-state batteries. The patent covers a preparation method that addresses the primary failure mode of silicon anodes: volume expansion during charge cycles.
What the patent covers
The patented method uses a double-layer coating process on silicon-carbon composite particles. This design reduces lithium-ion expansion to less than 3 percent per cycle, according to the company. Uncoated silicon anodes typically expand by 300 percent or more during lithiation, which cracks the electrode and degrades capacity over a few cycles. The dual coating mechanically constrains that expansion while maintaining electrical conductivity.
E-Power positions the material as a drop-in replacement for graphite anodes. Graphite has a theoretical capacity of 372 mAh/g; silicon offers up to 4,200 mAh/g. The tradeoff has always been cycle life. If the patent claims hold at production scale, the material could enable solid-state cells with energy densities approaching 1,200 Wh/kg — roughly triple current lithium-ion packs.
Industrialization timeline
E-Power operates a joint venture that has completed construction of a manufacturing facility with a production capacity of 50,000 tons of graphite anode material per year. The plant runs on renewable electricity, which the company says keeps production costs low. The patent grant is intended to accelerate the shift from graphite to silicon-carbon anodes at that facility.
The company says the patent establishes a technical foundation for industrial-scale production of solid-state battery materials in Guizhou Province. No specific production start date or volume targets for the new material were disclosed.
Strategic context
E-Power's core business is AI data center microgrid solutions and advanced battery materials. The company's chairman, Haiping Hu, has been involved in the graphite anode industry since 1999. The patent is part of a broader strategy to integrate material science breakthroughs with the company's existing energy infrastructure business.
The solid-state battery market is still pre-commercial for most applications. Several automakers and battery manufacturers target 2027–2028 for production vehicles with solid-state cells. E-Power's patent addresses one of the remaining materials hurdles — anode stability — but does not cover electrolyte or cathode innovations needed for a complete cell.
Bottom line
The double-layer coating patent is a concrete materials advance for silicon-carbon anodes. Whether it translates into commercially viable solid-state cells depends on production yield, cost per kilowatt-hour, and integration with other cell components. E-Power's existing 50,000-ton graphite facility gives it a manufacturing base that most silicon-anode startups lack.