Chinese electric vehicle (EV) batteries are set to become safer and more powerful, as carmakers including SAIC Motor and Chery Automobile outline road maps for the commercialisation of solid-state technology. Solid-state batteries – which use a solid electrolyte to conduct ions between electrodes – are widely seen as a superior alternative to conventional lithium-ion batteries that rely on liquid or gel-based materials. Analysts say the technology promises higher energy density, improved safety...