High Energy Density Silicon Anode Li-ion Batteries

Amprius Technologies is a leading developer of pioneering silicon anode lithium-ion batteries for drones and robotics.

Our products provide the highest known energy density of any commercially available lithium-ion batteries in the world, offering a drop-in replacement for conventional solutions while delivering up to 200% greater run time.

Our 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. To address growing customer demand, we expanded our product portfolio to include the SiCore™ platform in 2024, significantly enhancing our ability to serve additional applications. 

Our advanced SiMaxx silicon anode, lithium-ion batteries are designed and manufactured in the U.S., and have been selected by the U.S. Department of Defense as well as industry leaders such as AALTO Airbus, BAE Systems, AeroVironment and Teledyne FLIR.

SiMaxx Leading Batteries

The new SiCore batteries are based on an innovative, proprietary silicon anode material system delivering high-energy-density silicon anode batteries that surpass state-of-the-art graphite cell performance today. The new silicon anode cell chemistry is designed to offer high energy density, up to 400 Wh/kg, and long cycle life, as many as 1,200 cycles at full depth of discharge. 

SiCore Leading Batteries

Our corporate headquarters is in Fremont, California, where we maintain an R&D lab and a MWh scale manufacturing facility for the fabrication of silicon anodes and cells. To better serve customer demand, Amprius has entered into several agreements securing over 500MWh of contract manufacturing available immediately! The company has also entered into a lease agreement for a GWh-scale manufacturing facility in Brighton, Colorado.

Amprius has received numerous awards for our state-of-the-art battery technology, including:

• Fast Company’s World’s Most Innovative Companies of 2024
• 2024 CleanTech Breakthrough Battery Technology Company of the Year Award
• 2024 International Battery Seminar – Best of Show New Product Award
• Fast Company 2023 Innovation by Design Award Finalist
• 2023 International Battery Seminar – Best of Show New Product Award
• Fast Company World Changing Ideas 2022 Finalist
• Airbus Defence and Space 2021 Innovative Supplier of the Year Award

Energy dense battery technology for UAVs and unmanned systems

Our patented SiMaxx silicon anode technology features a unique manufacturing process that results in ultra-high energy density batteries. Thanks to our innovative nanowire structure, we have addressed the issue of swelling, which has historically hindered the adoption of silicon. Offering the world’s only commercially available 100% silicon anode, our cell is capable of storing up to ten times more lithium than conventional graphite cells.

Our advanced silicon anode batteries also demonstrate good cycle life and fast charging times. We have repeatedly demonstrated 80% charging in under six minutes, performance that has been validated by independent third-party labs as well as multiple major aerospace companies.

All this adds up to create a technological leap that enhances the capabilities and effectiveness of UAVs, eVTOLs, aircraft, and unmanned ground vehicles. This advancement paves the way for the evolution of electric mobility in the future.

Amprius Extreme Fast-Charge Demonstration
Extreme fast charge rate of 0-80% state of charge in less than six minutes demonstrated with Amprius’ 370 Wh/kg silicon anode battery:

Learn more: High Energy Density Drone Batteries

Advanced silicon anode batteries for drones and robotics

Our high-performance lithium-ion batteries are ideal for a wide range of mission-critical and commercial applications. In addition to increasing flight times and vehicle ranges, the rapid charging time provides faster turnaround for applications such as drone delivery and UAM (urban air mobility).

Amprius silicon anode lithium-ion batteries outperform traditional graphite anode batteries in a variety of key metrics:

Learn more: Silicon anode battery solutions for drones and robotics

“Nobody Has Anything Like This” – Amprius Factory Tour
A tour of the Amprius facility in Fremont, CA to learn about their manufacturing process, battery testing, and future plans: