Hithium’s sodium-ion storage push, where it could win, where it won’t, and path to bankability

A battery maker called Hithium is pushing a new type of grid battery that uses sodium instead of lithium. This is mostly utility-scale news, not something tied to a specific home product yet, but it signals where battery costs and supply could head in coming years, including for home batteries paired with solar.

Sodium-ion batteries use a material that is abundant and widely available, unlike lithium, whose supply is concentrated and whose prices swing. Hithium says sodium-ion cells can last many charge cycles over long periods, which could lower costs over a battery's lifetime even if the upfront price is not yet cheaper than today's common lithium iron phosphate (LFP) batteries. Right now, LFP still has a cost edge for standard projects because its supply chain is more established. Sodium-ion is expected to make more sense for uses with frequent cycling and long operating lives, where lower long-term costs matter more than the initial price tag.

The company has run safety tests on its first version of the sodium-ion cell, including drop, crush, overcharge and thermal-runaway tests, and is now testing a newer version. It says the technology is not yet proven enough for banks, insurers and large customers to commit to it at scale. That will require more real-world operating data, bigger supply chains for materials, and established warranty and service track records.

For homeowners, there is no product to buy yet. But as sodium-ion matures, it could eventually show up in home battery systems too, offering an alternative to lithium with potentially more stable pricing and longer life.