Huishing Peng and colleagues from Fudan University in Shanghai have developed a strategy for designing channel structures in electrodes to incorporate polymer gel electrolytes and to form intimate and stable interfaces for high-performance wearable batteries. As a demonstration, multiple electrode fibres were rotated together to form aligned channels, while the surface of each electrode fibre was designed with networked channels. The monomer solution was effectively infiltrated first along the aligned channels and then into the networked channels. The monomers were then polymerized to produce a gel electrolyte and form intimate and stable interfaces with the electrodes.

The team managed to fabricate fiber lithium-ion batteries with lengths of several kilometers and a high energy density that can effectively provide power for electrical devices like drones. They have established a pilot production line and achieved a production capacity of 300 watt-hours per hour, which is equivalent to the battery produced per hour capable of charging 20 mobile phones simultaneously. The concept shows promise for applications in firefighting and space exploration.