Engineers just demonstrated a sodium-ion battery using abundant seawater-derived sodium rather than scarce lithium — achieving 10,000 charge cycles with 91% capacity retention at a manufacturing cost 97% lower than equivalent lithium-ion systems.
A team from Faradion and the University of Birmingham developed a layered sodium manganese oxide cathode paired with a hard carbon anode — all materials derived from abundant globally distributed resources with no geographic concentration of supply. Energy density reached 285 watt-hours per kilogram — 85% of premium lithium-ion performance — with charge rate of 4C meaning full charge in 15 minutes. Cycle testing confirmed 91% capacity at 10,000 cycles compared to lithium-ion's typical 80% at 1,000 cycles.
Sodium is the sixth most abundant element on Earth at 2.6% of crustal mass and present in essentially unlimited quantity in seawater. The elimination of lithium, cobalt, and nickel — all requiring environmentally damaging mining concentrated in politically unstable regions — removes the primary supply chain constraints limiting global battery deployment for grid storage and electric vehicles.
Source: Faradion Ltd, University of Birmingham School of Chemistry, Nature Energy, 2024
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