Electrospinning Metal Organic Frameworks For Flexible Energy Storage Electrode

The wearable is a motivation for developing electronic devices.The portable power,the key part of electronic devices,is an active research field now.The electrode is one of the important components in the power system,and it is also an important part of whether the power system can work as expected.Therefore,the development of new and efficient flexible electrodes is crucial for flexible wearable batteries.Based on this,metal organic frameworks with high specific surface area and easy modification were uesd to prepare flexible electrodes by simple and universal electrospinning method.The performance of these electrodes in lithium-ion batteries,and sodium-ion batteries is also discussed.The specific content is summarized as follows:1.Herein is presented a facile approach,by electrospinning a manganese-based metal organic framework(Mn-BTC),to fabricate yolk-shell MnOx nanostructures within carbon nanofibers in a botryoid morphology.While the yolk-shell structure accomodates the lithiated volume expansion of MnOx,the fiber confinement ensures the structural integrity during charge/discharge,achieving a so-called double-buffering for cyclic volume fluctuation.The formation mechanism of the yolk-shell structure is well elucidated through comprehensive instrumental characterizations and cogitative control experiments,following a combined Oswald ripening and Kirkendall process.Outstanding electrochemical performances are demonstrated with prolonged stability over 1000 cycles,boosted by the double-buffering design,as well as the "breathing" effect of lithiation/delithiation witnessed by ex situ imaging.Both the fabrication methodology and electrochemical understandings gained here for nanostructured MnOx can also be extended to other TMOs toward their ultimate implementation in high-performance lithium ion batteries(LIBs).2.CNTs were added to the electrospinning slurry of Experiment 1 to enhance the conductivity of the electrodes,thereby improving the performance of the lithium-ion batteries of the electrodes.In terms of capacity,rate performance,and stability of the electrode in lithium ion battery.3.Nanoframes of CoOx are encapsulated into carbonized microporous fibers by electrospinning zeolitic imidazolate frameworks to impart both the sodium-hosting capability and catalytic activities for reversible oxygen conversion.The ultrahigh rate performance of Sodium-ion batteries up to 20 A g-1 and ultrastable cycling over 6000 cycles are attributed to a dual-buffering effect from the framework strcture of CoOx and the confinement of carbon fibres that effectively accomodates cyclic volume flucturation.Both in-situ Raman and ex-situ microscopic analyses unveil reversible conversion of CoOx during the sodiation/desodiation process.The excellent ORR activity superior to commerical Pt/C is mainly ascribed to the abundant Co-N-C species and the full exposure of active sites on the microporous framework structure.Flexible and rechargeable Sodium-ion full batteries and Zinc-air batteries are further demonstrated with great energy efficiency,cycling stability,as well as mechanical deformability.