Amprius reveals breakthrough in aircraft battery tech


Lithium-ion battery specialist Amprius Technologies has revealed an “unmatched” breakthrough lithium-ion battery that expands the use cases for electric aircraft.

The cell achieves a discharge rate of 10C while delivering 400 Wh/kg energy density, this is a major advancement for electric aviation, said Amprius, including both crewed and uncrewed aerial systems. It extends flight range by as much as 50% and also increases payload capacity. Capabilities also extend to high-performance EVs, potentially enabling them to achieve 0 to 60 mph acceleration in under 1.5 seconds.

Dr. Kang Sun, CEO of Amprius, said: “Commercial opportunities in electric mobility are profoundly impacted by their power and energy requirements. Our new cell delivers impressive specific power and energy density performance, approximately 200% higher than traditional graphite cells, while achieving a 10C discharge rate, significantly expanding application possibilities and driving cost-effectiveness.”

With a power density of 3500 W/kg in standard discharge conditions and a maximum power exceeding 4400 W/kg at lower depths-of-discharge, the cell’s usable discharge capability is also extended. The cell supports high current pulses at low states of charge without going below the lower cut-off voltage, namely 3000 W/kg at 30% depths-of-discharge. On top of that, the combination of high energy density and high-power density reduces battery weight and volume, leading to extended range, reduced charging frequency and lower operating costs. There is also an ultra-fast charging capability, reaching 80% charge in approximately six minutes or less.

Amprius, which has been part-funded through a US Department of Energy grant, expects to have samples of this cell available for customers by the end of 2023 with the commercialisation of the new cells slated for early 2024.