Scientists at the University of Southern Denmark (USD) working on sodium-ion batteries have discovered that a new type of electrode material containing iron, manganese, and phosphorus can increase battery power and capacity.
After lithium-ion batteries, sodium-ion batteries are also a hot topic for scientists, because they have the potential to provide similar performance to lithium-ion batteries, do not need to rely on rare materials, and there is no danger of fire.
So far, sodium ion batteries have seen limited commercial applications, but they still struggle to match lithium-ion batteries and other energy storage technologies in terms of energy density and long-term stability. A team of researchers from the University of Southern Denmark (USD) 's new findings on sodium-ion batteries suggests that battery capacity can be further increased.
The research team studied batteries with olivine-type sodium ferrophosphate (NaFePO4) as the cathode and tested ideas derived from lithium-ion technology. They found that in lithium-ion batteries (LiFePO4), replacing some of the iron with manganese can solve many problems such as battery performance and stability. Therefore, the research team further investigated whether manganese would play a similar role in the chemical reaction of sodium ion batteries, and the results of the study are positive.
The researchers said: "Surprisingly, this effect remains in sodium ion batteries because the interaction between the electrode and sodium ions is very different from lithium ions."
The research results of the group were published in the journal Applied Energy Materials. The results show that according to different configurations, replacing 10-20% of the iron in the cathode with manganese can stabilize the solution, and even realize the entire charging process. Completely continuous solid solution conversion increases the battery capacity by more than 15%.
Researchers point out that it is still challenging to make sodium batteries small enough to rival commercial lithium-ion technology, so it may take some time before we see them powering mobile phones or electric cars, but the technology is already available For fixed energy storage.
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