Flexible supercapacitors for energy storage

What is a flexible supercapacitor?

A supercapacitor is a potential electrochemical energy storage device with high-power density (PD) for driving flexible, smart, electronic devices. In particular, flexible supercapacitors (FSCs) have reliable mechanical and electrochemical properties and have become an important part of wearable, smart, electronic devices.

Are flexible supercapacitors a good choice for energy storage?

Intelligent, flexible energy storage, and conversion devices with low weight, high safety, small volume, excellent electrochemical performance, and good mechanical durability are in great demand 1. Flexible supercapacitors are promising candidates because of their strong mechanical flexibility and high safety even under mechanical distortion.

Are flexible supercapacitors suitable for wearable devices?

Nowadays, with the rapid development of wearable electronic devices, the requirements for electrode materials of flexible supercapacitors are more stringent. Compared with traditional supercapacitors, flexible supercapacitors have the same energy storage mechanism.

Why are flexible supercapacitors attracting more attention?

Flexible supercapacitors are attracting more attention as new developing tendency of the energy storage devices for broader and more modern application in the wearable and portable electronics.

What are stretchable supercapacitors?

Stretchable supercapacitors have gained widespread use due to their crucial function in flexible and wearable supercapacitors. They not only provide the most basic energy-storage function, but can also operate in a variety of mechanically deformed environments, such as stretching, bending, twisting, and compression.

How flexible is a fiber-type supercapacitor?

Even after repeated bending every 100 charge-discharge cycles, the C3 (1.0)@mDW (100)-based supercapacitor had a capacitance retention of 88.0% after 500 cycles, which is almost the same as that without mechanical deformation; this validates the superior flexibility of the fiber-type supercapacitor (Fig. 7A).