Understanding the Chemical Composition with Doping Aliovalent Ions, Followed by the Electrochemical Behavior for Surface-Modified Ni-Rich NMC Cathode Materials

초록

A comparative study of doping aliovalent ions, Zr- or Al-, into Nirich Li(Ni,Co,Mn)O-2 cathode materials is conducted in terms of the electrochemical properties and chemical analysis, especially on the surface region. The solubility and chemical composition for the given sol-gel treatment matches well with the computational results with which the infinitesimal Zr-coating is identified as exhibiting increased charge capacity with prolonged cycle life. Specifically, the whole process can be understood by the suppressed lithium-ion charge transfer resistance (R-CT) during the cycles, which can be facilitated by the decreased NiO formation during the cyclic reactions.

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