Morphology‐Tuned Synthesis of NiCo2O4‐Coated 3D Graphene Architectures Used as Binder‐Free Electrodes for Lithium‐Ion Batteries |
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Authors: | Chunfei Zhang Prof Jong‐Sung Yu |
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Institution: | Department of Energy Systems Engineering, DGIST, Daegu, Republic of Korea |
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Abstract: | Nanostructured NiCo2O4 is directly grown on the surface of three‐dimensional graphene‐coated nickel foam (3D‐GNF) by a facile electrodeposition technique and subsequent annealing. The resulting NiCo2O4 possesses a distinct flower or sheet morphology, tuned by potential or current variation electrodeposition, which are used as binder‐free lithium‐ion battery anodes for the first time. Both samples exhibit high lithium storage capacity, profiting from the unique binder‐free electrode structures. The flower‐type NiCo2O4 demonstrates high reversible discharge capacity (1459 mAh g?1 at 200 mA g?1) and excellent cyclability with around 71 % retention of the reversible capacity after 60 cycles, which are superior to the sheet‐type NiCo2O4. Such superb performance can be attributed to high volume utilization efficiency with unique morphological character, a well‐preserved connection between the active materials and the current collector, a short lithium‐ion diffusion path, and fast electrolyte transfer in the binder‐free NiCo2O4‐coated 3D graphene structure. The simple preparation process and easily controllable morphology make the binder‐free NiCo2O4/3D‐GNF hybrid a potential material for commercial applications. |
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Keywords: | anodes graphene lithium-ion batteries morphology control nickel |
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