Angewandte Chemie International Edition · 2018 · 197 citations · 33 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemistryNanomaterialsNanotechnologyAnode MaterialsBattery MaterialsElectrochemical Energy StorageElectrode MaterialsEnergy Storage MaterialsNanomaterials For Energy StorageCycling StabilityGrapheneMxene ElectrodesPotassium-ion BatteriesPotassium-ion Battery ElectrodesReduced Graphene OxideSodium-ion Battery ElectrodesSodium-ion Battery Materials
Abstract Confined transformation of assembled two‐dimensional MXene (titanium carbide) and reduced graphene oxide (rGO) nanosheets was employed to prepare the free‐standing films of the integrated ultrathin sodium titanate (NTO)/potassium titanate (KTO) nanosheets sandwiched between graphene layers. The ultrathin Ti‐based nanosheets reduce the diffusion distance while rGO layers enhance conductivity. Incorporation of graphene into the titanate films produced efficient binder‐free anodes for ion storage. The resulting flexible NTO/rGO and KTO/rGO electrodes exhibited excellent rate performances and long cycling stability characterized by reversible capacities of 72 mA h g −1 at 5 A g −1 after 10000 cycles and 75 mA h g −1 after 700 cycles at 2 A g −1 for sodium and potassium ion batteries, respectively. These results demonstrate the superiority of the unique sandwich‐type electrodes.
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