Alternative battery chemistries for EVs and energy storage

In late July 2026, sodium‑ion batteries were highlighted as a cheaper, more abundant alternative to lithium‑ion cells, but their lower energy density (140‑180 Wh/kg) made them unsuitable for e‑bikes, where added weight would cut range. The technology was seen as better suited to larger two‑wheelers or delivery fleets.

By early August 2026, coverage expanded to the broader electric‑vehicle market. Sodium‑ion remained attractive for cost reduction and reduced reliance on strategic minerals, while research continued to close its energy‑density gap. At the same time, semi‑solid batteries—combining solid‑state safety with liquid‑electrolyte performance—entered series production in China, offering higher energy density and faster charging. Industry experts, such as BorgWarner’s Marcelo Rezende, view semi-solid designs as a “pragmatic intermediate step” before fully solid-state cells become mainstream.

By mid-August 2026, sodium-ion technology emerged as a significant contender for large-scale stationary energy storage, including power grids and data centers, due to its safety profile and lower risk of thermal runaway. While unlikely to replace lithium-ion in most electric vehicles, a Morgan Stanley report suggests sodium-ion could account for more than “one-third of global battery production within the next decade.”

This shift has sparked a geopolitical race for manufacturing dominance. While China is rapidly expanding production through companies like BYD and CATL, U.S. entities including Peak Energy, Inlyte Energy, and General Motors are working to scale domestic production to reduce reliance on Chinese supply chains. Peak Energy, for instance, aims to begin large-scale battery pack production in California by 2027.