Electrochemical performance of Sr2+-doped LiNi0.8Co0.2O2 as a cathode material for lithium batteries synthesized via a wet chemistry route using oxalic acid

Oxalic acid assisted sol-gel synthesis of Sr2+-doped LiNi0.8Co0.2O2, has been reported for the first time. Structural characterization was carried out using X-ray diffraction studies. Electrochemical studies were performed by assembling 2032 coin cells with lithium metal as an anode. The charge-discharge studies were performed galvonostatically at a 0.1 C rate from 3.0-4.2 V. Of all the doped compositions with dopant mole ratios ranging from 10(-8) to 10(-4), the compound with a dopant mole ratio of 10(-6) showed improved capacity and cyclabilty with a first cycle discharge capacity of 173 mAh/g and 10th cycle of 167 mAh/g. The improvement in capacity has been discussed using a defect model. (C) 2002 Elsevier Science B.V. All rights reserved.