Several US start-up companies are working to establish domestic sodium ion battery manufacturing capabilities, positioning themselves as competitors to China’s dominant position in the sector. Sodium ion batteries represent an emerging technology that proponents argue could be cheaper to produce and operate than traditional lithium ion batteries, while also presenting advantages in safety and temperature tolerance. San Diego-based Unigrid sells nine kilowatt hour batteries for residential use and has reported increased international demand, particularly from European customers seeking energy storage solutions during peak heating periods. The company currently sources sodium ion cells from China but plans to potentially transition to US-sourced materials in the future. Unigrid’s battery design incorporates chromium-3 in its cathode, though this choice has prompted safety concerns from some battery experts regarding the potential formation of chromium-6 under certain conditions. Company leadership maintains that the battery has passed European certification and safety tests, with internal testing unable to produce chromium-6 formation. Other companies are pursuing similar strategies. Seattle-based Emerald Battery Labs is developing 12-volt auxiliary batteries for vehicle applications and plans to create new anodes for US-produced sodium ion cells. Peak Energy announced a partnership with General Motors to develop a US supply chain for sodium ion batteries, with the goal of establishing a Michigan production facility by a specified timeline. Current pricing for sodium ion batteries remains higher than some lithium ion alternatives, with Unigrid’s technology trading around $100 per kilowatt hour compared to lower-cost lithium options. However, industry participants suggest costs could eventually decline significantly. The technology’s lower energy density compared to lithium ion means applications will likely focus on larger stationary energy storage rather than portable devices. Increased electricity demand from data centers is cited as one factor providing US companies confidence in their competitive positioning against established Chinese manufacturers.
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