摘要
Extensive efforts have recently been devoted to the construction of aqueous rechargeable sodium-ion batteries(ARSIBs)for large-scale energy-storage applications due to their desired properties of abundant sodium resources and inherently safer aqueous electrolytes.However,it is still a significant challenge to develop highly flexible ARSIBs ascribing to the lack of flexible electrode materials.In this work,nanocube-like KNiFe(CN)6(KNHCF)and rugby balllike NaTi2(PO4)3(NTP)are grown on carbon nanotube fibers via simple and mild methods as the flexible binder-free cathode(KNHCF@CNTF)and anode(NTP@CNTF),respectively.Taking advantage of their high conductivity,fast charge transport paths,and large accessible surface area,the as-fabricated binder-free electrodes display admirable electrochemical performance.Inspired by the remarkable flexibility of the binder-free electrodes and the synergy of KNHCF@CNTF and NTP@CNTF,a high-performance quasi-solid-state fiber-shaped ARSIB(FARSIB)is successfully assembled for the first time.Significantly,the as-assembled FARSIB possesses a high capacity of 34.21 mAh cm?3 and impressive energy density of 39.32 mWh cm?3.More encouragingly,our FARSIB delivers superior mechanical flexibility with only 5.7%of initial capacity loss after bending at 90°for over 3000 cycles.Thus,this work opens up an avenue to design ultraflexible ARSIBs based on all binder-free electrodes for powering wearable and portable electronics.
Extensive e orts have recently been devoted to the construction of aqueous rechargeable sodium?ion batteries（ARSIBs） for large?scale energy?storage applications due to their desired proper?ties of abundant sodium resources and inherently safer aqueous elec?trolytes. However, it is still a significant challenge to develop highly flexible ARSIBs ascribing to the lack of flexible electrode materials. In this work, nanocube?like KNiFe（CN）6（KNHCF） and rugby ball?like NaTi2（PO4）3（NTP） are grown on carbon nanotube fibers via sim?ple and mild methods as the flexible binder?free cathode（KNHCF@CNTF） and anode（NTP@CNTF）, respectively. Taking advantage of their high conductivity, fast charge transport paths, and large accessible surface area, the as?fabricated binder?free electrodes display admirable electrochemical performance. Inspired by the remarkable flexibility of the binder?free electrodes and the synergy of KNHCF@CNTF and NTP@CNTF, a high?performance quasi?solid?state fiber?shaped ARSIB（FARSIB） is successfully assembled for the first time. Sig?nificantly, the as?assembled FARSIB possesses a high capacity of 34.21 mAh cm-3 and impressive energy density of 39.32 mWh cm-3. More encouragingly, our FARSIB delivers superior mechanical flexibility with only 5.7% of initial capacity loss after bending at 90° for over 3000 cycles. Thus, this work opens up an avenue to design ultraflexible ARSIBs based on all binder?free electrodes for powering wearable and portable electronics.
基金
supported by the Fundamental Research Funds for the Central Universities(No.020514380183)
the National Natural Science Foundation of China(No.51703241)
the Key Research Program of Frontier Science of Chinese Academy of Sciences(No.QYZDB-SSW-SLH031)
the Thousand Youth Talents Plan,and the Science and Technology Project of Nanchang(2017-SJSYS-008).
