Electrochemical tests indicate that the material prepared by the co-precipitation method has slightly better electrochemical properties, with an initial discharge capacity of 185 mAhg−1 and capacity retention of % after 50 cycles at a cycling rate of C, as well as better capability at 7 C. The improved performances of the co-precipitation synthesized material may be attributed to the low Li/Ni disorder. | Vietnam Journal of Chemistry, International Edition, 54(6): 724-729, 2016 DOI: Electrochemical properties of synthesized by sol-gel and co-precipitation methods Mai Thanh Tung*, Vu Duc Luong Department of Electrochemistry and Corrosion Protection, School of Chemical Engineering Hanoi University of Science and Technology Received 9 August 2016; Accepted for publication 19 December 2016 Abstract Layered cathode materials have been prepared by sol-gel and co-precipitation methods. The structural, morphological and electrochemical properties of the materials were compared. The XRD patterns show that both the sol–gel and the co-precipitation method formed single phase materials with good layered characteristics. Electrochemical tests indicate that the material prepared by the co-precipitation method has slightly better electrochemical properties, with an initial discharge capacity of 185 mAhg−1 and capacity retention of % after 50 cycles at a cycling rate of C, as well as better capability at 7 C. The improved performances of the co-precipitation synthesized material may be attributed to the low Li/Ni disorder. Keywords. Lithium ion batteries, Ni-rich material, co-precipitation, , co-precipitation, sol-gel method. 1. INTRODUCTION Lithium ion batteries (LIBs) have numerous outstanding features including high energy density, high conversion efficiency, no gaseous exhaust, improved safety and longer cycle life [1, 2]. The research and promotion of cathode materials are most important in the application potential of LIBs. The application of batteries utilizing layered LiCoO2 has been limited by the relatively low specific capacity and high cost of cobalt application in plug-in hybrid vehicles (PHEVs) and all-electric vehicles (EVs) [35]. Recently, the layered structure series material LiNi1−x−yCoxMnyO2 (NCM) has received increased attention [6-9]. High nickel content NCM .
