In answer to your question, it is an energy density issue, but it’s also an issue of molecular weights. Sodium ion batteries are extremely heavy, and are better suited for fixed location batteries. In addition, as you noted, if utilized for a car battery, they will inherently have reduced range compared to lithium ion batteries, et al.
Sodium ion batteries, along with Vanadium Redox Batteries, may give lithium ion batteries a run for their money when it comes to ESS applications, but their utility for EV usage is limited, at best.
When it comes to the “smaller than EV” applications, from hand tools to gardening equipment, there is no comparison; sodium ion batteries would be a laughing stock. You would need to be built like Arnold Schwarzenegger to run a leaf blower for an eight hour day!
Best regards
Good News & Bad News, page-40582
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