High performance lithium insertion negative electrode materials for electrochemical devices

摘要

Spinel LiCrTiO4 oxides to be used as electrode materials for a lithium ion battery and an asymmetric super capacitor were synthesized using a soft-chemical method with and without chelating agents followed by calcination at 700 degrees C for 10 h. Structural and morphological properties were studied with powder Xray diffraction, scanning electron and transmission electron microscopy. Particles of 50-10 nm in size are observed in the microscopic images. The presence of Cr and Ti is confirmed from the EDS spectrum. Electrochemical properties of LiCrTiO4 electrode were examined in a lithium ion battery. The electrode prepared with oxalic acid-assisted LiCrTiO4 shows higher specific capacity.This LiCrTiO4 is also used as anode material for an asymmetric hybrid supercapacitor. The cell exhibits a specific capacity of 65 mAh/g at 1 mA/cm(2). The specific capacity decreases with increasing current densities. (C) 2016 Elsevier B.V. All rights reserved.