Comparative Study and Design Optimization of Supercapacitors for High Powered LED Flashlight Camera Phones

A supercapacitor (SC), sometimes ultracapacitor, formerly electric double-layer capacitor (EDLC) is an electrical energy storage device which offers high energy density compared to conventional capacitors. One recent application of supercapacitors is to power the LED flashlight of high resolution camera phones. To eliminate dark and blurry photos, the camera phone designers have to meet three possible requirements while using LED flashlight: high capacitance, low ESR and suitable device thickness. Cap-XX Inc. is one of the supplier of supercapacitor to meet these requirements. In this paper, a thorough study has been done to evaluate that compared to the prismatic supercapacitor of Cap-XX Company, laser-scribed graphene (LSG) supercapacitor with gelled electrolyte is comparatively smaller in size and can provide more capacitance. Moreover, the proposed research is to optimize the capacitance of LSG supercapacitor by choosing suitable electrolyte, size and shape of electrode, and mobile ion of electrolyte for the purpose of powering LED flashlight of camera phones. The validation of the design has been done by analyzing three models of EDLC structure through MATLAB simulation tools.