Lithium-ion has hit a practical energy ceiling of around 300–350 Wh/kg, even with the latest silicon anode enhancements.

That ceiling directly constrains what unmanned systems can do. Every gram of battery weight is a gram that can’t be payload, sensor, or fuel. For a drone designed for long-range surveillance or as a loitering munition, the battery determines how far it can fly, how long it can stay on target, and how much it can carry. Modern defense platforms increasingly demand longer endurance, greater maneuverability, and higher payload capacity — and lithium-ion simply can’t deliver the step-change in energy density those requirements need.

The difference comes down to the anode. Lithium-ion uses a graphite anode — graphite is a heavy host material that stores lithium ions but adds weight without contributing energy. Lithium-metal replaces graphite with a metallic lithium anode.

Lithium metal stores far more energy per unit of weight, which is why our Licerion® cells reach energy densities exceeding 500 Wh/kg, compared to roughly 300–350 Wh/kg for today’s best lithium-ion. That gap of up to 200 Wh/kg is the difference between a two-hour mission and a five-hour mission, or between carrying a small sensor payload and a meaningful one.

The core challenge is that metallic lithium is chemically aggressive.

During charge and discharge cycles, it tends to form dendrites – tiny, needle-like structures that can grow across the cell and cause failures or safety issues. It also reacts with the electrolyte, degrading performance over time.

Sion Power has spent over a decade solving these materials science problems: developing electrolyte formulations, protective coatings, and cell architectures that make lithium-metal reliable, manufacturable and certifiable. That work is what separates a promising lab result from a product you can actually integrate into a defense program.

Strike is built for high-power applications: loitering munitions, tube-launched ISR assets, and high-speed reconnaissance drones. It supports a 6C continuous discharge rate, which means it delivers very high power very quickly without thermal derating — critical for aggressive maneuvering or a high-power terminal phase. Strike cells are available for purchase and already shipping.

It means a platform designed around Licerion® cells can loiter, fly, or operate significantly longer on the same battery weight — or carry the same energy in a much lighter, smaller pack.

For a fixed-wing ISR drone, that might mean extending a four-hour mission to ten or twelve hours. For a loitering munition, it could mean a dramatically extended range or a longer time-on-target. For a logistics drone, it enables heavier payloads and longer delivery routes. By combining high-energy lithium-metal chemistry with advanced battery pack engineering, defense integrators can unlock two to three times increases in mission endurance, significantly extended operational range, and dramatically higher payload capacity compared with conventional lithium-ion and lithium-polymer batteries used in today’s unmanned systems.

China built its battery supply chain dominance over decades. Reducing that dependence takes sustained work, and no single chemistry addresses every vulnerability.

We eliminate graphite from the anode of our lithium-metal solutions, removing a key material dependency by design.

We manufacture our batteries entirely in the United States. Our reliance on Chinese-made materials is already limited, and we’re systematically qualifying alternative sources to strengthen supply resilience and to meet U.S. defense sourcing requirements.

The right time to engage is before you’ve locked in your battery architecture — energy density assumptions drive airframe design, payload allocation, and mission planning from the ground up.

We have proven repeatable performance in our Licerion® Strike™ demonstration pack. If you design a platform around 300 Wh/kg and then switch to 510 Wh/kg, you fundamentally change what the platform can do. With double the flight time, our technology puts more missions within reach that weren’t before. The earlier we are in the conversation, the more value we can deliver to the program.