Scientists at Harvard University have significantly improved the previous version of their rechargeable liquid battery, which can store energy from renewable sources throughout the day. It differs in that it is made from affordable and cheap materials and is safer.
Lithium-ion batteries are great for smartphones and electric vehicles. But they are not suitable for storing energy obtained from wind generators and solar panels due to fluctuations in the network for reasons associated with the change of day and night and a change in wind strength up to complete calm. With the advent of liquid batteries, this problem has been resolved.
Stream batteries store energy in a "liquid" form. Differently charged electrolytes are located in external containers. To obtain an electrical charge, it is necessary to pump fluids through a special membrane. The battery power can be adjusted by changing the capacity of the tanks or the area of the membrane. If necessary, the flow can be stopped without fear of loss of charge and sudden temperature changes.
Professor Michael Aziz and his colleagues, taking into account previous experience, have developed an environmentally friendly battery based on safe, non-toxic and heat-resistant compounds of carbon, iron and potassium. Battery life is at least 1900 cycles, which is much longer than lithium-ion batteries.
Scientists are currently working on increasing the energy density, since 19 Wh is clearly not enough for a battery. In their opinion, it will take about 3 years to solve this problem.