Date : 19-Feb-2025
Researchers in Germany have compared the electrical behaviour of sodium-ion batteries with that of lithium-iron-phosphate batteries under varying temperatures and state-of-charges. Their work shows how state-of-charge during cycling significantly affects the efficiency of sodium-ion devices.
Image: Technical University of Munich (TUM), Journal of Power Sources, CC BY 4.0
Researchers ascertained that the temperature dependence of R DC and impedance is higher for SIBs than LIBs. “The LIB tests do not show a significant influence of the SOC on the round-trip efficiency. In contrast, cycling the SIBs from 50% to 100% SOC can reduce efficiency losses by more than half compared to cycling from 0% to 50%,” they further explained, noting that the efficiency of SIBs grows drastically when cycling the cells in a higher SOC range compared to a lower SOC range.
Their findings are available in the study “Comparing the electrical performance of commercial sodium-ion and lithium-iron-phosphate batteries,” published in the Journal of Power Sources. “Our findings indicate that the state-of-charge during cycling significantly affects the efficiency of sodium-ion batteries and should therefore be taken into account,” they concluded.
Reference :
Sodium-ion vs. lithium-iron-phosphate batteries – pv magazine India