GM to develop sodium-ion batteries for grid storage

General Motors announced on June 9 that it is developing sodium-ion battery cells for large-scale energy storage, marking a strategic expansion beyond electric vehicles. The automaker is partnering with the U.S. energy storage startup Peak Energy, with support from a strategic investment by GM Ventures.

The partnership aims to deliver lower-cost, more reliable grid-scale storage systems. GM will design and develop the sodium-ion cells at its battery laboratories in Warren, Michigan, and retain exclusive manufacturing rights. Peak Energy will integrate the cells into its battery energy storage systems (BESS). The companies argue that sodium-ion chemistry is well-suited for stationary storage, where factors like weight and energy density are less critical than cost, reliability, and safety.

A key advantage of the technology is its potential to eliminate the need for active cooling systems. Sodium-ion cells can operate across a wider temperature range, which Peak Energy says allows for a passively cooled platform. This reduction in system complexity is expected to lower both upfront costs and long-term maintenance, contributing to an estimated 20 percent reduction in energy storage...