Sodium-ion batteries enter mass production. Calcium-ion cells clear 1,000 cycles. And a counterintuitive discovery at Surrey challenges decades of battery-chemistry orthodoxy. On February 5, 2026, CATL and Changan Automobile unveiled what CATL called the world’s first mass-production passenger vehicle equipped with sodium-ion batteries. The vehicle, powered by CATL’s Naxtra cells at an energy density of…