Part 5/12:
Sodium-ion batteries are still largely experimental, with some models beginning to enter the market. The chemistry involves replacing lithium with sodium in the cathode; some variants incorporate phosphates. While early sodium batteries grappled with low energy densities (~100-130 Wh/kg), recent advancements—such as the Naxra sodium batteries from Chinese manufacturer CHL—have demonstrated significantly higher energy densities (~175 Wh/kg), surpassing certain lithium-based competitors like the Blade batteries.