Twisted fiber batteries for wearable electronic devices

Wearable electronic devices are important in recording signals related to human activities. Because the performance of wearable electronic devices depends heavily on power sources, batteries, especially fiber batteries have been attracting numerous attention in the past decades. Here, we present a perspective of fiber lithium-ion battery (FLIB) equipped with excellent energy supply, deformability, and feasibility to be woven into textile electronics. The scalable production and sustainable application of these FLIBs in health monitoring could be realized benefitting from the decreased internal resistance with length. This kind of fiber battery is anticipated to show its potentials in not only next-generation flexible devices but also regenerative medicine and tissue engineering.