New solid-state sodium battery design could replace lithium in EVs

Researchers at Western University in Ontario, Canada, led by Professor Yang Zhao, have developed a new solid-state sodium battery design that could offer a cheaper, safer, and more sustainable alternative to lithium-ion batteries commonly used in electric vehicles (EVs) and renewable energy storage. This innovation replaces lithium, which is costly, flammable, and scarce, with sodium—an abundant and inexpensive element. The team addressed a major challenge in solid-state sodium batteries by creating a novel solid electrolyte material composed of sulfur and chlorine, which facilitates efficient sodium-ion conduction while enhancing the material’s stability and strength. Laboratory tests demonstrated that the new electrolyte exhibits high sodium-ion conductivity along with excellent thermal and mechanical resilience, qualities essential for batteries to endure thousands of charge-discharge cycles and extreme temperatures without degradation. Using advanced X-ray analysis at the Canadian Light Source synchrotron, the researchers gained detailed insights into ion movement and bonding within the electrolyte, accelerating material development. Although commercial solid-state sodium batteries remain several years away, this