Although our sodium-ion batteries work in a similar way to other rechargeable batteries, they have some unique advantages. These include an extended operational voltage window, which offers safety benefits, and a wide temperature range.
Our substantial Intellectual Property portfolio enables a cell chemistry to be designed specific to an application.
Available Voltage Range
From zero to 4.3 Volts. The capability to be cycled to and stored at zero volts leads to safer cells and cheaper costs.
We have prioritised developing high energy density cells to meet the demands of current and future applications. Our prototype cells deliver energy density in excess of 140 Wh/kg, with a design performance of 155 Wh/kg in 10Ah pouch cells. Current cell designs can provide gravimetric and volumetric energy densities comparable to lithium-ion and greatly in excess of lead-acid batteries.
Power (Rate) Capability
Sodium-ion cells can be cycled under conditions suitable for energy storage and mobile applications. An example of the cycling rates is a range of 2C (0.5 hour) to C/10 (10 hours). In addition high power bursts can be achieved with our Na-ion technology.
The cycle life is designed to meet the requirements of the application. The cycle life of sodium-ion cells ranges from hundreds to thousands of cycles, depending on depth of discharge and charge/discharge conditions.
The (round trip) energy efficiency of sodium-ion batteries is 92% at a discharge time of 5 hours, in contrast with a lead-acid battery that has an energy efficiency of circa 70%. Sodium-ion has been identified as only one of two battery technologies that has could meet the energy efficiency targets of > 90% for stationary battery systems in 2030, in the joint European Association for Energy Storage and European Energy Research Alliance European Energy Storage Technology Development Roadmap for Public Consultation.
Sodium-ion cells have demonstrated performance and excellent capacity retention over the temperature range -20°C to +60°C.