There exist many concluded salt water battery projects around the globe up to now. Indeed, energy generation based on renewable sources is a clean alternative to coal- or gas-based energy. A well-known disadvantage of renewables is the temporal fluctuation of provided heat or electricity. Rechargeable batteries are an opportunity to store energy when renewables output exceeds system demand. Conversely, the battery can be discharged. Owing to the worldwide booming clean energy sector, it is advisable to use clean, sustainable battery systems also in cities. One opportunity is a saltwater battery.
Aquion Energy, based in Pittsburgh (Pennsylvania – USA), is the first company offering rechargeable saltwater batteries on a large scale as of 2014. The non-flammable and non-explosive battery is made of none-hazardous materials. Since its launch, this clean alternative has been delivered worldwide. In the following map, selected worldwide salt water battery projects are shown. Hover for more information.
Mapping Worldwide Saltwater Battery Projects
Worldwide salt water battery projects provided by Aquion (Data: Aquion Energy)
The most important advantage of the so-called Aqueous Hybrid Ion (AHI™) battery is the sodium sulfate (Na2SO4) electrolyte. Sodium sulfate is theoretically edible and also used in the food processing industry. Furthermore, the non-toxic and non-flammable battery is composed of a manganese oxide cathode, a carbon composite anode, and a synthetic cotton separator. Therefore, it is environmentally friendly and secure to handle.
According to Aquion Energy, AHI batteries can nearly deliver a full 3,000 cycles even if they are fully cycled at 100% depth of discharge. If the depth of discharge is lower, the cycle life increases proportionally. So, AHI systems do not need to be oversized to ensure a long-term performance. The often applied lithium-ion batteries or lead-acid batteries are more dangerous and cannot be fully discharged without a significant reduction in the battery cycle life.
I line with the catchy slogan “Clean energy systems need clean batteries”, AHI batteries are also cradle-to-cradle certified. The raw material extraction as well as the disposal is safer and environmentally sustainable compared to nickel-cadmium, nickel-metal hydride, lithium ion and sealed lead-acid batteries.
AHI batteries are flexible. They can be used for energy management, microgrid, off-grid, and grid service applications.