Key Factors for Optimizing Energy Density in High‐Performance Supercapacitors

Electroceramics with high energy density are very crucial to meet the increasing demands of energy storage devices. Storage devices with high electrochemical performance are the need of the hour. Superior electrochemical performance has a direct tie with parameters, such as high storage density and power density. High-performance supercapacitors can be achieved by simply enhancing energy density. Many factors greatly influence the energy storage density of a supercapacitor. The energy density can easily be tailored by controlling two factors such as capacitance and voltage. The energy density is affected by parameters such as spore size, grain size, surface area, functional group, and band gap. The voltage can be increased by introducing asymmetric supercapacitors or hybrid supercapacitors. The future perspective of new methods to improve energy density is deliberated briefly.