A solid-state battery is a type of battery technology that uses solid materials for both the electrolyte and the electrodes. Unlike traditional lithium-ion batteries, which use liquid electrolytes, solid-state batteries can offer higher energy density, improved safety, and longer life cycles. This makes them a promising option for various applications, including electric vehicles and portable electronics. The solid electrolyte in these batteries can reduce the risk of leaks and fires, common issues with liquid electrolytes. Companies like Toyota and QuantumScape are actively researching and developing solid-state batteries to enhance performance and reliability in future energy storage solutions.