Nanocrystalline LiCrTiO 4 as anode for asymmetric hybrid supercapacitor

Abstract

Lithiated spinel, LiCrTiO 4 is synthesized by sonochemical method followed by calcination at 923 K for 2 h. The prepared material is characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersion X-ray spectroscopy (EDX). Cubic phase LiCrTiO 4 with Fd3 m space group is evident from the XRD. Particles of 60–70 nm in size are observed from the microscopic images. The presence of respective elements is confirmed from EDX analysis. The electrochemical characteristics of LiCrTiO 4 electrode were evaluated in a lithium battery cell. It has been found that the intercalation of lithium ions into LiCrTiO 4 lattice occurs at 1.5 and 1.65 V vs. Li/Li + with ionic conduction behavior. A reversible specific capacity of ∼ 160 mAh/g was obtained. Nanocrystalline LiCrTiO 4 is exploited as anode for asymmetric hybrid supercapacitor and the electrochemical performance is investigated. The cell exhibited a specific capacity of 59 mAh/g at 1 mA/cm 2 in a non-aqueous electrolyte. It also showed good cycling performance for 1000 cycles with 96% retention in capacity.