Effect of niobium doping to enhance electrochemical performances of LiNi0.8Co0.1Mn0.1O2 cathode material

초록

The Ni-rich layered LiNi0.8Co0.1Mn0.1O2 cathodes have high energy density and theoretical capacity, which can be used as a wide of energy storage applications. However, some challenges hinder their further commerciali-zation due to its structural instability, resulting in severe capacity fade and voltage attenuation. In this work, the incorporation of Nb into the LiNi0.8Co0.1Mn0.1O2 cathode contributes to stabilize the surface/interfacial structure and reduce cation disordering thereby improving the electrochemical performances. Especially, Nb-doped LiNi0.8Co0.1Mn0.1O2 cathode shows the superior initial discharge capacity of 202.3 mAh g-1, excellent cycle stability of 90.6% at 0.1C after 100 cycles and the outstanding thermal stability. Therefore, the Nb doped LiNi0.8Co0.1Mn0.1O2 cathode can be regarded as an efficient approach for the improvement of Ni-rich cathode materials.

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