▎ 摘　　要

For the burgeoning fiber-shaped batteries as a desirable wearable power supply, the priority is to construct fiber-shaped electrodes with high volumetric capacity because of the limited usable space on the human body. However, it still remains a big challenge. Herein, based on carbon-noncarbon strategy ultrafine SnO2 nanoparticles are uniformly accommodated in porous layered reduced graphene oxide (rGO) fibers, resulting in lamellar rGO-SnO2 hybrid fibers. The loading of SnO2 and the ratio of SnO2 to void are readily adjusted by the amount of ammonium hydroxide during the process of SnO2 formation. Upon an optimal technique, the rGO-SnO2 hybrid fiber presents largely enhanced mechanical strength and conductivity compared with rGO fiber, which are 3.8 times and 7.7 times the values of rGO fiber, respectively. Moreover, the hybrid fiber exhibits superb volumetric capacity of 1682 mAh cm-3 at 0.1 A g(-1), which surpasses the available fiber-shaped electrodes hitherto. Furthermore, by matching with LiFePO4/carbon fiber cathode, a fiber-shaped battery is achieved and is flexible, washable and knittable, providing a prospect in the next-generation wearable electronics.