To further study of novel nano-structured with varied chemical composition materials, we carry out the synthesis and characterization of O3-type layered structure cathode material of constant concentration Na[Ni0.60Co0.15Mn0.25]O2 and full concentration gradient Na[Ni0.61Co0.12Mn0.27]O2 material. Through the comparison of electrochemical properties and related structural properties, herein, we investigated and defined the novel concept FCG materials.
Especially, we focus on the effect of particle morphology and micro structured properties by using micro scope technique. We believe that the unexplored site of radially assembled nano-rod structure primary particles having varied chemical composition is highly contribute to high power and high energy Na-ion battery systems.
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 J.-Y. Hwang, S.-M. Oh, S.-T. Myung, K.-Y. Chung, I. Belharouak, Y.-K. Sun. Nat. Commun. 6 (2015) 6865.