Modeling and analysis of lithium ion capacitor based on improved electrochemical model.

A lithium ion capacitor is a kind of novel energy storage device with the combined merits of a lithium ion battery and a supercapacitor. In order to obtain a design scheme for lithium ion capacitor with as much superior performance as possible, the key research direction is the ratio of battery materials and capacitor materials in lithium ion capacitor composite cathode materials. In this work, an improved electrochemical model of a lithium ion capacitor is proposed, and the simulated results obtained from the model were validated based on experiments, including under the premise of fixed electrode quality, under the current applied to the battery material keeps unchanged, and under the current applied to the capacitor material keeps unchanged. Results show that the improved model can simulate the electrode properties of lithium ion capacitor with high precision, and 0.3~0.4 is recommended as the best volume ratio for improving the specific energy of lithium ion capacitor. [ABSTRACT FROM AUTHOR]