Longer-Lasting Batteries Are Under Development for Wearable Devices

A type of battery that could eventually store twice as much energy as a conventional one could soon move beyond niche applications to wearable devices, phones and even electric cars. Solid-state batteries, as they’re called, have been available for a while, and are used in some wireless sensors, but they have been too expensive to use elsewhere. Applied Materials, one of the world’s biggest equipment suppliers for the semiconductor and display industries, says it can make these batteries mu...