Sodium-ion batteries （SIBs） have attracted increasing attention in the past decades, because of high over-all abundance of precursors, their even geographical distribution, and low cost. Na3V2（PO4）3 （NVP）, atypi...Sodium-ion batteries （SIBs） have attracted increasing attention in the past decades, because of high over-all abundance of precursors, their even geographical distribution, and low cost. Na3V2（PO4）3 （NVP）, atypical sodium super ion conductor （NASlCON）-based electrode material, exhibits pronounced structuralstability, exceptionally high ion conductivity, rendering it a most promising electrode for sodium storage.However. the comparatively low electronic conductivity makes the theoretical capacity of NVP cannot befully accessible even at comparatively low rates, presenting a major drawback for further practical ap-plications, especially when high rate capability is especially important. Thus, many endeavors have beenconformed to increase the surface and intrinsic electrical conductivity of NVP by coating the active mate-rials with a conductive carbon layer, downsizing the NVP particles, combining the NVP particle with vari-ous carbon materials and ion doping strategy. In this review, to get a better understanding on the sodiumstorage in NVP, we firstly present 4 distinct crystal structures in the temperature range of-30℃-225℃ namely α-NVP, β-NVP, β′-NVP and γ-NVP. Moreover, we give an overview of recent approaches to en-hance the surface electrical conductivity and intrinsic electrical conductivity of NVP. Finally, some poten-tial applications of NVP such as in all-climate environment and PHEV, EV fields have been prospected.展开更多
In recent years,more and more efforts are devoting to clean energy,renewable energies in particular to achieving net zero carbon dioxide emissions[1].However,renewable energies,like solar power and wind power,are gene...In recent years,more and more efforts are devoting to clean energy,renewable energies in particular to achieving net zero carbon dioxide emissions[1].However,renewable energies,like solar power and wind power,are generally intermittent and random,hindering their wide application[2,3].To address this problem,there is an urgent need in effective and reliable energy storage device.展开更多
A convenient and practical synthetic route for 2,4-dibromo-5-fluorobenzoic acid is described. Two intermediates, 2,4-dibromo-5-fluorobenzonitrile and 2,4-dibromo-5-fluorobenzamide, have not been reported before. This ...A convenient and practical synthetic route for 2,4-dibromo-5-fluorobenzoic acid is described. Two intermediates, 2,4-dibromo-5-fluorobenzonitrile and 2,4-dibromo-5-fluorobenzamide, have not been reported before. This route can be easily industrialized.展开更多
Rechargeable aqueous zinc-ion batteries(AZIBs)have gained increasing attention owing to their low cost and high safety.Although hydrated vanadium oxides exhibit rich redox chemistry and open layer architecture,the ins...Rechargeable aqueous zinc-ion batteries(AZIBs)have gained increasing attention owing to their low cost and high safety.Although hydrated vanadium oxides exhibit rich redox chemistry and open layer architecture,the insertion of multivalent Zn2+during cycling inevitably leads to host collapse and severe vanadium dissolution.Accordingly,various ions and conducting polymers have been introduced into the interlayer to produce vanadium bronzes with a robust crystal structure.However,these pre-intercalated vanadium bronzes demonstrate limited improvement and still face the challenge of metal ion displacement and confusing reaction mechanisms.Herein,we report a novel molecular bronze with intercalated 3-phenylpropylamine for use as an AZIB cathode,which produces an ultrahigh interlayer of 18.0Å.The cathode delivered an improved capacity of 420 mAh g^(−1)at 0.1 A g^(−1),an impressive rate capability of 158 mAh g^(−1)at 35 A g^(−1),and an outstanding lifespan with a capacity retention of 94%over 1200 cycles at 2A g^(−1).Furthermore,the reaction mechanism of H+/Zn2+co-insertion was investigated in detail.This work proves that this strategy is universal for vanadium oxide bronzes and opens a new avenue for the fabrication of novel molecular bronzes as advanced AZIB cathodes.展开更多
基金financial support from the National Natural Science Foundation of China (No.21501171,51403209,21406221,51177156/E0712)
文摘Sodium-ion batteries （SIBs） have attracted increasing attention in the past decades, because of high over-all abundance of precursors, their even geographical distribution, and low cost. Na3V2（PO4）3 （NVP）, atypical sodium super ion conductor （NASlCON）-based electrode material, exhibits pronounced structuralstability, exceptionally high ion conductivity, rendering it a most promising electrode for sodium storage.However. the comparatively low electronic conductivity makes the theoretical capacity of NVP cannot befully accessible even at comparatively low rates, presenting a major drawback for further practical ap-plications, especially when high rate capability is especially important. Thus, many endeavors have beenconformed to increase the surface and intrinsic electrical conductivity of NVP by coating the active mate-rials with a conductive carbon layer, downsizing the NVP particles, combining the NVP particle with vari-ous carbon materials and ion doping strategy. In this review, to get a better understanding on the sodiumstorage in NVP, we firstly present 4 distinct crystal structures in the temperature range of-30℃-225℃ namely α-NVP, β-NVP, β′-NVP and γ-NVP. Moreover, we give an overview of recent approaches to en-hance the surface electrical conductivity and intrinsic electrical conductivity of NVP. Finally, some poten-tial applications of NVP such as in all-climate environment and PHEV, EV fields have been prospected.
基金financially supported by the National Natural Science Foundation of China(Grant No.21935003 and 21908217)DICP I201928+1 种基金the China Postdoctoral Science Foundation(No.2019M651158)the CAS Engineering Laboratory for Electrochemical Energy Storage。
文摘In recent years,more and more efforts are devoting to clean energy,renewable energies in particular to achieving net zero carbon dioxide emissions[1].However,renewable energies,like solar power and wind power,are generally intermittent and random,hindering their wide application[2,3].To address this problem,there is an urgent need in effective and reliable energy storage device.
文摘A convenient and practical synthetic route for 2,4-dibromo-5-fluorobenzoic acid is described. Two intermediates, 2,4-dibromo-5-fluorobenzonitrile and 2,4-dibromo-5-fluorobenzamide, have not been reported before. This route can be easily industrialized.
基金This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences[grant numbers XDA21070500,XDB17020200]the National Natural Science Foundation of China[grant numbers 22078319,21935003,21908217]+1 种基金Youth Innovation Promotion Association CAS[grant numbers 2021180]the DNL Cooperation Fund,CAS[grant numbers DNL201914].
文摘Rechargeable aqueous zinc-ion batteries(AZIBs)have gained increasing attention owing to their low cost and high safety.Although hydrated vanadium oxides exhibit rich redox chemistry and open layer architecture,the insertion of multivalent Zn2+during cycling inevitably leads to host collapse and severe vanadium dissolution.Accordingly,various ions and conducting polymers have been introduced into the interlayer to produce vanadium bronzes with a robust crystal structure.However,these pre-intercalated vanadium bronzes demonstrate limited improvement and still face the challenge of metal ion displacement and confusing reaction mechanisms.Herein,we report a novel molecular bronze with intercalated 3-phenylpropylamine for use as an AZIB cathode,which produces an ultrahigh interlayer of 18.0Å.The cathode delivered an improved capacity of 420 mAh g^(−1)at 0.1 A g^(−1),an impressive rate capability of 158 mAh g^(−1)at 35 A g^(−1),and an outstanding lifespan with a capacity retention of 94%over 1200 cycles at 2A g^(−1).Furthermore,the reaction mechanism of H+/Zn2+co-insertion was investigated in detail.This work proves that this strategy is universal for vanadium oxide bronzes and opens a new avenue for the fabrication of novel molecular bronzes as advanced AZIB cathodes.
