Abstract
To improve Li storage capacity and the structural stability of Ti3C2 MXene-based electrode materials for lithium-ion batteries (LIBs), a facile strategy is developed to construct three-dimensional (3D) hierarchical porous Ti3C2/bimetal-organic framework (NiCo-MOF) nanoarchitectures as anodes for high-performance LIBs. 2D Ti3C2 nanosheets are coupled with NiCo-MOF nanoflakes induced by hydrogen bonds to form 3D Ti3C2/NiCo-MOF composite films through vacuum-assisted filtration technology. The morphology and electrochemical properties of Ti3C2/NiCo-MOF are influenced by the mass ratio of MOF to Ti3C2. Owing to the interconnected porous structures with a high specific surface area, rapid charge transfer process, and Li+ diffusion rate, the Ti3C2/NiCo-MOF-0.4 electrode delivers a high reversible capacity of 402 mAh g−1 at 0.1 A g−1 after 300 cycles; excellent rate performance (256 mAh g−1 at 1 A g−1); and long-term stability with a capacity retention of 85.7% even after 400 cycles at a high current density, much higher than pristine Ti3C2 MXene. The results highlight that Ti3C2/NiCo-MOF have great potential in the development of high-performance energy storage devices.
Highlights
With the eVer-growing energy shortage and environmental pollution, the exploration of advanced renewable energy technologies has become extremely imperative [1]
Among various energy storage devices, lithium-ion batteries (LIBs) have been regarded as very attractive candidates for portable electronic devices and low-emission electric vehicles owing to their high energy density, long-term cyclability, and environmental benignity [2,3,4,5]
Ti3C2 MXene is the most extensively used as electrode materials for energy storage devices for its low Li+ diffusion barrier and accessibility [14,15,16]
Summary
With the eVer-growing energy shortage and environmental pollution, the exploration of advanced renewable energy technologies has become extremely imperative [1]. In spite of considerable progress in the development of Ti3C2 MXene, its practical application in LIBs is still restricted to a certain extent This is because the introduction of some spacers [20,21] into MXene sheets reduces the conductivity and specific surface area of the MXene electrode, and the volume change during the electrochemical reaction could not be alleviated effectively on account of a weak interaction between MXene and other active materials. In view of the fact that NiCo-MOF nanosheets have high active surface area, unsaturated metal sites, rapid electron transfer, and short diffusion paths of ions, it is beneficial to design MXene/NiCo-MOF composite architectures rationally as anodes for LIBs, in order to take full advantages of both components Following this idea, an effective strategy is developed to prepare 3D porous Ti3C2/NiCoMOF composites via an interlayer hydrogen-bond interaction between Ti3C2 and NiCo-MOF nanosheets. The effect of the NiCo-MOF loading in the composites on the structural and electrochemical properties of the composite is investigated
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