Recent progress of fiber-shaped batteries towards wearable application

Rapid development of portable or wearable devices, which is inspired by requirements of instant messaging, health monitoring and handling official business, urgently demands more tiny, flexible and light power sources. Fiber-shaped batteries explored in recent years become a prospective candidate to satisfy these demands. With 1D architecture, the fiber-shaped batteries could be adapted to various deformations and integrated into soft textile and other devices. Numerous researches have been reported and achieved huge promotion. To give an overview of fiber-shaped batteries, we summarized the development of fiber-shaped batteries in this review, and discussed the structure and materials in fiber-shaped batteries. The flexibility of batteries with the potential application of the batteries was also exhibited and showed the future perspective. Finally, challenges in this field were discussed, hoping to reveal research direction towards further development of fiber-shaped batteries.