Abstract
NiCoO2 anode has some drawbacks such as unsatisfied electrical conductivity and severe volume change during cycling, leading to dissatisfactory rate capability and poor cycling stability. In order to address these issues, a NiCoO2 nanosheet/reduced graphene oxide composite (NiCoO2/rGO) is prepared via solvothermal process followed by heat treatment employing the honeycomb-like three-dimensional rGO as the support. This NiCoO2/rGO exhibits reversible charge specific capacities of 1124.0 and 414.5 mAh g−1 at 100 and 2000 mA g−1, respectively. After 300 cycles at 500 mA g−1, the charge specific capacity remains 114.8% of the initial value. The lithium storage performance is much superior to the bare NiCoO2, which is attributed to the support of the highly conductive and robust 3D rGO matrix that not only enhances the electrical conductivity and charge transfer, but also buffers the volume change, maintaining the structural integrity and electrical conduction of the electrode during cycling.
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