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Understanding the Chemical Composition with Doping Aliovalent Ions, Followed by the Electrochemical Behavior for
Eun Gyu Lee1, Hyemin Park1, Seulki Ji1
1Advanced Materials Division, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Dajeon 34114, Republic of Korea.
Abstract:
A comparative study of doping aliovalent ions, Zr- or Al-, into Ni-rich Li(Ni,Co,Mn)O2 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 (RCT) during the cycles, which can be facilitated by the decreased NiO formation during the cyclic reactions.
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