Research Article
Nayaka GP, Pai KV, Manjanna
Abstract
In order to improve the cycling performance of LiMn2O4 based cathode materials, we have synthesized a new composition LiCo0.4Al0.1Mn1.5O4 by sol-gel method. In the path of the material synthesis, citric acid was added to serve as a binding agent and a gelling agent respectively, followed by calcinations at 850°C for 12 h. The synthesized material was well characterized by TG/DTA, XRD, FTIR, EPR, SEM, electrical and electrochemical tests. It was found that LiCo0.4Al0.1Mn1.5O4 powder has an ordered cubic spinel phase (space group Fd3m) and exhibits good rate capability. The electrical and electrochemical characterization was carried out in CR-2032 coin type cell configuration. The material delivers an initial discharge capacity of 48 mAhg-1 between 3.5 and 4.9 V at a C/10 rate and subjected for more than 30 cycles. The electrochemical behavior is well supported with impedance data.