Electrodeposited Si˗O˗C as a High-Rate Performance Anode for Li˗ion Capacitor

Abstract

Li–ion capacitors (LIC) which bridge the advantages of supercapacitors and Li–ion batteries have attracted a great deal of attention as a promising energy storage device. In this study, we synthesize the Si–O–C by electrodeposition at low levels of electricity below 2.0 C cm –2 as an anode for LIC. The deposited Si amounts are controlled by charge density during electrodeposition from 0.3 to 1.0 C cm –2. The material and electrochemical characteristics of Si–O–C fabricated at a charge density of 1.0 C cm –2 are studied. The LIC consisting of Si–O–C anode shows an encouraging 95% retention of the initial capacity after 1000 cycles. In addition, the LIC shows a capacity retention ratio of 94% at 140 C–rate. This study reveals the potential prospect to use Si–O–C fabricated by electrodeposition as an anode for a high–rate capability for LIC.