Electrical engineering

Physics

Nanotechnology

Electrode

Yarn

Mathematics

Energy storage

Statistics

Wearable computer

Engineering

Electronics

Physical chemistry

Embedded system

Composite material

Power (physics)

Chemistry

Materials science

Computer science

Flexibility (engineering)

Wearable technology

Quantum mechanics

Capacitance

Carbon nanotube

Supercapacitor

Small

Yarn-shaped supercapacitors (YSCs) once integrated into fabrics provide promising energy storage solutions to the increasing demand of wearable and portable electronics. In such device format, however, it is a challenge to achieve outstanding electrochemical performance without compromising flexibility. Here, MXene-based YSCs that exhibit both flexibility and superior energy storage performance by employing a biscrolling approach to create flexible yarns from highly delaminated and pseudocapacitive MXene sheets that are trapped within helical yarn corridors are reported. With specific capacitance and energy and power densities values exceeding those reported for any YSCs, this work illustrates that biscrolled MXene yarns can potentially provide the conformal energy solution for powering electronics beyond just the form factor of flexible YSCs.

High‐Performance Biscrolled MXene/Carbon Nanotube Yarn Supercapacitors