Abstract
Zinc-ion hybrid fiber supercapacitors
(FSCs) are promising energy storages for wearable electronics
owing to their high energy density, good flexibility,
and weavability. However, it is still a critical challenge to
optimize the structure of the designed FSC to improve
energy density and realize the continuous fabrication of
super-long FSCs. Herein, we propose a braided coaxial
zinc-ion hybrid FSC with several meters of Ti3C2Tx
MXene cathode as core electrodes, and shell zinc fiber
anode was braided on the surface of the Ti3C2Tx
MXene
fibers across the solid electrolytes. According to the simulated
results using ANSYS Maxwell software, the braided
structures revealed a higher capacitance compared to the
spring-like structures. The resulting FSCs exhibited a high
areal capacitance of 214 mF cm–
2, the energy density of 42.8 μWh cm−
2 at 5 mV s−
1, and excellent cycling stability with 83.58% capacity
retention after 5000 cycles. The coaxial FSC was tied several kinds of knots, proving a shape-controllable fiber energy storage. Furthermore,
the knitted FSC showed superior stability and weavability, which can be woven into watch belts or embedded into textiles to power