Critical Parameters and Their Influence on Hybrid Supercapacitor with Silicon Based Anode

Abstract

Development of novel energy storage systems with high energy and power is highly demanded due to the rapid growing commercial electrical device market. Among many electrochemical energy storage systems, supercapacitor has been recognized as promising system for power-based applications. A hybrid structure using lithium-ion battery electrode paring with conventional electric double-layer electrode has drawn attention in recent years, as it provides higher energy and power density than traditional EDLC type capacitors. Here we report a summary of our recent investigation on some critical parameters and their influence on the hybrid type supercapacitor using silicon based anode material. The study focused on the N/P ratio, electrode areal loading, prelithation of silicon based anode, electrolyte selection, etc. Besides ordinary chemical and electrochemical characterizations, we also utilized a modified 3-electrode setup to study the electrochemical behavior on both electrodes. Further analysis reveals the relationship between the full-cell voltage and electrode voltage. The impact of the critical parameters as mentioned above on the cycling stability and energy/power density will be discussed with the experiment result analysis. We’ll also share some principles for the active material screening, electrode fabrication and cell design targeting desired applications.