New magnesium alloy boosts solid-state battery life 400-fold

Researchers at Tohoku University developed a magnesium-tin alloy that makes solid-state batteries last 400 times longer than those using pure magnesium. Instead of eliminating the chemical reactions that typically degrade batteries, the team learned to control them, improving how magnesium ions move and maintaining long-term stability. This breakthrough could reshape how next-generation batteries are designed, prioritizing interface chemistry rather than just avoiding it.