Scientists from Moscow State University have synthesized a new material for sodium-ion batteries, the cost of which is 100 times lower than lithium-ion analogs. Sodium vanadium pyrophosphate showed unique electrochemical properties.
Sodium carbonate batteries are much cheaper than lithium-ion batteries, but are 30-50% larger with the same energy capacity. Sodium battery is cheaper due to the use of inexpensive and lightweight aluminum instead of copper.
The chemists solved the problem of large dimensions by studying the structure previously described for large alkaline cations — potassium, rubidium and cesium. Sodium vanadium pyrophosphate has an energy capacity of 420 W·h / kg. This is only 20% less than the lithium-based cathode material LiCoO2. Before the study by Russian scientists, the record energy capacity of the sodium battery was 400 W·h / kg.
The second achievement of chemists was the extremely small change in volume during charge-discharge. – only 0.5%. According to this indicator, sodium vanadium pyrophosphate is close to the most stable material that is widely used in electric vehicle batteries. – lithium titanium spinel.
Scientists from Moscow State University still have to work on improving the electrochemical properties of the compound, after which the sodium-ion battery will be able to displace the lithium-ion analogs widely used in smartphones, laptops, household appliances and electric vehicles..
The study of the chemical properties of new compounds is continuously being carried out all over the world. Scientists in Germany recently discovered a new stable form of plutonium.
text: Ilya Bauer
Sodium-ion batteries vs lithium-ion batteries #Electriccarandbike