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Flexible quasi-solid-state sodium-ion full battery with ultralong cycle life,high energy density and high-rate capability

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Nano Research 2022年第2期15卷 925-932页

作者： Chen-De Zhao Jin-Zhi Guo Zhen-Yi Gu Xiao-Tong Wang Xin-Xin Zhao Wen-Hao Li Hai-Yue Yu Xing-Long Wu Faculty of Chemistry Northeast Normal UniversityJilin 130024China MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityJilin 130024China

Flexible power sources featuring high-performance,prominent flexibility and raised safety have received mounting attention in the area of wearable electronic devices.However,many great challenges remain to be overcome,notably the design and fabrication of flexible electrodes with excellent electrochemical performance and matching them with safe and reliable electrolytes.Herein,a facile approach for preparing flexible electrodes,which employs carbon cloth derived from commercial cotton cloth as the substrate of cathode and a flexible anode,is proposed and investigated.The promising cathode(NVPOF@FCC)with high conductivity and outstanding flexibility is prepared by efficiently coating Na_(3)V_(2)(PO_(4))_(2)O_(2)F(NVPOF)on flexible carbon cloth(FCC),which exhibits remarkable electrochemical performance and the significantly improved reaction kinetics.More importantly,a novel flexible quasi-solid-state sodium-ion full battery(QSFB)is feasibly assembled by sandwiching a P(VDF-HFP)-NaClO_(4) gel-polymer electrolyte film between the advanced NVPOF@FCC cathode and FCC anode.And the QSFBs are further evaluated in flexible pouch cells,which not only demonstrates excellent energy-storage performance in aspect of great cycling stability and high-rate capability,but also impressive flexibility and safety.This work offers a feasible and effective strategy for the design of flexible electrodes,paving the way for the progression of practical and sustainable flexible batteries.

关键词： flexible sodium-ion battery gel-polymer electrolyte quasi-solid-state carbon cloth Na_(3)V_(2)(PO_(4))_(2)O_(2)F

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Recent advances on quasi-solid-state electrolytes for supercapacitors

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Journal of Energy Chemistry 2022年第4期31卷 697-717页

作者： Murilo M.Amaral Raissa Venâncio Alfredo C.Peterlevitz Hudson Zanin Advanced Energy Storage Division Center for Innovation on New EnergiesCarbon Sci-Tech Labs and Manufacturing GroupSchool of Electrical and Computer EngineeringUniversity of CampinasCampinasSP 13083-852Brazil

Solid-state and quasi-solid-state electrolytes have been attracting the scientific community’s attention in the last decade. These electrolytes provide significant advantages, such as the absence of leakage and separators for devices and safety for users. They also allow the assembly of stretchable and bendable supercapacitors. Comparing solid-state to quasi-solid-states, the last provides the most significant energy and power densities due to the better ionic conductivity. Our goal here is to present recent advances on quasisolid-state electrolytes, including gel-polymer electrolytes. We reviewed the most recent literature on quasi-solid-state electrolytes with different solvents for supercapacitors. Organic quasi-solid-state electrolytes need greater attention once they reach an excellent working voltage window greater than 2.5 V.Meanwhile, aqueous-based solid-state electrolytes have a restricted voltage window to less than 2 V. On the other hand, they are easier to handle, provide greater ionic conductivity and capacitance. Recent water-in-salt polymer-electrolytes have shown stability as great as 2 V encouraging further development in aqueous-based quasi-solid-state electrolytes. Moreover, hydrophilic conductive polymers have great commercial appeal for bendable devices. Thus, these electrolytes can be employed in flexible and bendable devices, favoring the improvement of portable electronics and wearable devices(376 references were evaluated and summarized here).

关键词： Quasi-solid-state electrolyte gel-polymer electrolyte Flexible supercapacitor Wearables

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Flexible sodium-ion batteries using electrodes from Samanea saman tree leaf-derived carbon quantum dots decorated with SnO_(2) and NaVO_(3)

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Clean Energy 2021年第2期5卷 354-374页

作者： Baskar Thangaraj Surawut Chuangchote Nutthapon Wongyao Pravin Raj Solomon Kamonchanok Roongraung Wachira Chaiworn Werasak Surareungchai Pilot Plant Development and Training Institute King Mongkut’s University of Technology ThonburiBangkhuntien-chaitalay RoadThakamBangkok-10150Thailand Department of Tool and Materials Engineering Faculty of EngineeringKing Mongkut’s University of Technology Thonburi126 Prachauthit RoadBangmodThungkruBangkok 10140Thailand Research Center of Advanced Materials for Energy and Environmental Technology King Mongkut’s University of Technology Thonburi126 Prachauthit RoadBangmodBangkok 10140Thailand Fuel Cells and Hydrogen Research and Engineering Center Pilot Plant Development and Training InstituteKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand School of Chemical and Biotechnology SASTRA-Deemed UniversityThanjavur-613402Tamil NaduIndia Integrative Biorefinery Laboratory National Center for Genetic Engineering and BiotechnologyNational Science and Technology Development AgencyPatumthani-12120Thailand School of Bioresources Technology and Nanoscience&Nanotechnology Graduate ProgrammeFaculty of ScienceKing Mongkut’s University of Technology ThonburiBangkhuntien-chaitalay RoadThakamBangkok 10150Thailand

Carbonaceous materials with large interlayer spacing and disordered structure are considered suitable as electrodes in sodium-ion batteries so as to overcome the problem encountered in conventional electrodes.In this study,carbon quantum dots(CQDs)decorated with SnO_(2)and NaVO_(3)are used as electrodes in the fabrication of flexible Na-ion batteries.CQDs are prepared from dead leaves of the Samanea saman tree through alkaline-peroxide treatment and hydrothermal carbonization.As-prepared CQDs exhibit a quantum yield of 21.03%at an excitation wavelength of 360 nm.Various separators such as indium-doped tin oxide/polyoxyethylene tridecyl ether(ITO/PTE),rice paper(RP),silicone with three big holes(SIL BH),silicone with many small holes(SIL SH)and cellulose paper(CP)have been tried in flexible Na-ion batteries.SIL SH achieved higher specific capacitance(881 F g-1)than other separators due to the function of many small holes on the surface of the silicone.The SIL SH separator delivered higher discharge capacities of 141 and 114 mC g-1 at 1.5 and 2.5 V than SIL BH.The RP separator delivered specific discharge capacities of 1087 and 347 mC g-1 in the 1st and 50th cycles,respectively,at 1 V.The RP separator delivered a high initial specific discharge capacity of 698 mC g-1 at 2 V and maintained a good discharge capacity of 222 mC g-1 in the 50th cycle.As compared to RP,SIL SH delivered high specific discharge capacity of 4246 in 1st cycle at 2 V but maintained a capacity of 71 mC g-1 in the 50th cycle.This study reveals the scope of developing flexible Na-ion batteries with high capacity and cyclability using carbonaceous materials derived from the leaves of the S.saman tree.

关键词： biomass carbon quantum dots separators gel-polymer electrolyte flexible Na-ion battery

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