Novel application of LiCoO2 as a high-performance candidate material for supercapacitor

Abstract Electrochemical performances of LiCoO 2 as a candidate material for supercapacitor are systematically investigated. LiCoO 2 nanomaterials are synthesized via hydrothermal reaction with consequent calcination process. And the particle size increases as the calcination temperature rises. LCO-650 sample with the largest particle size displays the maximum capacitances of 817.5 F·g −1 with the most outstanding capacity retention rate of 96.8% after 2000 cycles. It is shown that large particle size is beneficial to the electrochemical and structural stability of LiCoO 2 materials. We speculate that the micron-sized waste LiCoO 2 materials have great potential for supercapacitor application. It may provide a novel recovered approach for spent LIBs and effectively relieve the burdens on the resource waste and environment pollution.