Amprius Technologies launched its 450 Wh/kg SiCore lithium-ion battery. This is Amprius’ most energy-dense SiCore cell, offering 450 Wh/kg and 950 Wh/L, and is expected to move to mass production in the near term through its global manufacturing partners.

Built with Amprius’ proprietary silicon anode material system, this SiCore cell delivers up to 80% more energy than conventional lithium-ion cells with graphite anodes.

We’ve demonstrated what’s possible at 450 Wh/kg with our SiMaxx platform years ago. What makes this SiCore cell different and noteworthy is that it brings that level of extreme performance into a cell chemistry and format that are ready to scale with the existing lithium-ion battery manufacturing processes and equipment in the industry. It’s production-ready, commercially available, and already being qualified by customers today.

—Dr. Kang Sun, CEO of Amprius Technologies

Designed for extreme conditions to meet the demands of aviation and defense applications, the new SiCore cell delivers reliable performance across wide temperature ranges and mission-critical environments. It meets the demands of High-Altitude Platform Stations (HAPS), Medium-Altitude Platform Stations (MAPS), and unmanned aerial vehicles (UAVs), where energy density, weight, and endurance directly impact mission success. By providing longer range and greater payloads without increasing weight, this cell helps reduce total system cost. This allows operators to fly longer missions with fewer compromises, minimizing the need for additional batteries, fuel, or equipment.

This SiCore cell is being evaluated with plans to move into qualification with leading aviation and defense customers preparing for commercial deployment. To meet their demand, Amprius has built a global contract manufacturing network with gigawatt-hour-scale production capacity, ensuring the company can deliver these high-performance cells at a competitive cost.

UN38.3 certification, which is required for the safe air transport of lithium-ion batteries, is expected in this quarter for this cell. This will allow Amprius to begin volume shipments shortly afterward and support broader commercial deployment worldwide.

The commercial launch of the 450 Wh/kg SiCore cell follows the broader introduction of Amprius’ SiCore platform in January 2024. That announcement marked the debut of a new generation of silicon anode cells engineered for both high energy and high power in a single format.

The company’s commercially available SiMaxx batteries deliver up to 450 Wh/kg and 1,150 Wh/L, with third-party validation of 500Wh/kg and 1,300 Wh/L. Amprius expanded its product portfolio to include the SiCore platform in 2024, significantly enhancing its ability to serve additional customer applications.

The Company’s corporate headquarters is in Fremont, California, where it maintains an R&D lab and a MWh scale manufacturing facility for the fabrication of silicon anodes and cells. To serve customer demand, Amprius entered into several agreements to secure more than 1.8GWh of contract manufacturing capacity available today.