Energy storage mechanism of ion hybrid capacitor

What is a multivalent metal ion hybrid capacitor?

Multivalent metal ion hybrid capacitors have been developed as novel electrochemical energy storage systems in recent years.

What is a sodium ion hybrid capacitor?

The three-dimensional graphene skeleton supported the electrical charge, while the interlayer-expanded molybdenum disulfide enabled rapid diffusion of ions and provided sufficient energy storage sites. Sodium ion hybrid capacitors is fabricated by interlayer-expanded MoS2/rGO composite and it shows greater performance than lithium ion capacitor.

Is a potassium hybrid supercapacitor a K ion battery?

Although a holistic optimization was achieved in the system, enabling the device to deliver specific energy comparable to K ion battery, the system is classified as a potassium hybrid supercapacitor due to its energy storage mechanism 12, 13.

Are metal-ion hybrid capacitors a promising EES?

Metal-ion hybrid capacitors (Li, Na, K, Ca, Mg, Al, and Zn) as promising EESs attracting many scientists’ attention. By delivering considerable energy and power density at the nanoscale, they are expected to be used in portable and flexible electronics [, , , ] (Fig. 1 a).

Are sodium-ion hybrid capacitors a viable alternative to Li analogues?

Sodium-ion hybrid capacitors (NICs) can combine the benefits of high power capacitors and high energy batteries at a cost potentially lower than that of Li analogues. However, research on NICs is in the nascent stage and requires significant attention to enable their use in practical applications.

Why do hybrid devices have a high capacitance retention rate?

Because the interlayer-expanded structure allowed rapid ion diffusion and because of the conductive graphene network, the hybrid devices exhibited excellent cycle stability: Li-HSC maintains 97% of its capacitance after 10000 cycles, and furthermore, Na-HSC exhibits an outstanding capacitance retention rate of over 99% after 10,000 cycles.