Lithium-ion batteries (LIBs) continue to dominate the global market thanks to their rapidly falling costs and established supply chains. For this very reason, it is becoming increasingly difficult for alternative technologies to challenge this status quo each year. However, a new study indicates that sodium-ion batteries (SIBs) have now reached near cost parity with lithium-ion batteries.
According to the research, while SIBs have not yet achieved widespread use, particularly in electric vehicles, they have largely caught up in terms of cost advantage at the cell level. Researchers emphasize that the primary obstacle for sodium-ion batteries is their energy density. It is stated that SIBs, which currently lag behind lithium-ion batteries in gravimetric energy density, could close this gap with the introduction of solid-state sodium-ion technologies.
First Large-Scale Grid Projects Have Begun
The research also reveals that sodium-ion batteries are no longer just a theoretical alternative commercially. Today, 100 MWh-scale grid-type energy storage facilities are beginning to be built and commissioned. According to reports, this acceleration could further increase with the establishment of supply chains and the realization of economies of scale. Furthermore, the ability to produce SIBs on existing lithium-ion production lines with only minor modifications is a significant advantage.
The study, led by LUT University in Finland in collaboration with the Karlsruhe Institute of Technology in Germany and the University of Alcala in Spain, differs from previous analyses by including not only current costs but also performance developments at the material level and learning curves.
Record-Level Battery Demand Forecast for 2050
According to projections, investment costs for grid-scale battery systems could fall to the range of 28.5-51.9 €/kWh by 2050. Sodium-ion technology, which has reached almost the same cost level as lithium-ion batteries today, is stated to have the potential to surpass LIBs in the medium term. Furthermore, SIBs are noted to be more resilient to raw material price fluctuations and supply bottlenecks.
Another notable finding of the study is the projection that global stationary battery demand could reach levels between 67.9 and 106.5 TWh by 2050. This figure exceeds previous estimates in cost-optimized energy system analyses and stands out as one of the highest levels reported to date.
According to the study's long-term projections, the levelized cost of storage (LCOS) for sodium-ion batteries, whose cost rapidly decreases with increasing production scale, could fall to 11.2-13.6 €/MWh by 2050. In contrast, this value is expected to remain in the range of 15.8-22.1 €/MWh for lithium-ion batteries. In the literature reference scenario used for comparison, LCOS values are between 19.5-29.4 €/MWh.
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