Novel design of core shell structure by NCA modification on NCM cathode material to enhance capacity and cycle life for lithium secondary battery

In order to improve the structural stability and discharge capacity of Li[Ni0.6Co0.1Mn0.3]O-2 (core), we designed the core shell structure of Li[(Ni0.6Co0.1Mn0.3)(0.36)(Ni0.8Co0.15Al0.05)(0.64)]O-2 (core shell). The result of an EDS line analysis showed that the core of the low cost NCM and the shell of high nickel NCA were successfully synthesized as two phases. In this structural analysis, the core shell cathode material showed a reduction of cation mixing as compared with the core. In addition, the structural stability was enhanced by a hexagonal ordering. Because the structural stability is improved, the electrochemical properties showed that the core shell electrode remarkably improved its cycleability and discharge capacity as compared with the core. To the best of our knowledge, this result is the first report of the synthesis of a new composition. Also, it is effective because of the relatively low cost of using the NCM core of low cobalt. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.