Aqueous Na-ion batteries(ANIBs)are considered to be promising secondary battery systems for grid-scale energy storage applications and have attracted widespread attention due to their unique merits of rich resources o...Aqueous Na-ion batteries(ANIBs)are considered to be promising secondary battery systems for grid-scale energy storage applications and have attracted widespread attention due to their unique merits of rich resources of Na,as well as the inherent safety and low cost of aqueous electrolytes.However,the narrow electrochemical stability widow and high freezing point of traditional dilute aqueous electrolytes restrict their multi-scenario applications.Considering the charge-storage mechanism of ANIBs,the optimization and design of aqueous Nabased electrolytes dominate their low-temperature performance,which is also hot off the press in this field.In this review,we first systematically comb the research progress of the novel electrolytes and point out their remaining challenges in ANIBs.Then our perspectives on how to further improve the low-temperature performance of ANIBs will also be discussed.Finally,this review briefly sheds light on the potential direction of low-temperature ANIBs,which would guide the future design of high-performance aqueous rechargeable batteries.展开更多
Room temperature sodium-sulfur(RT Na-S)batteries are gaining extensive attention as attractive alternatives for large-scale energy storage,due to low cost and high abundancy of sodium and sulfur in nature.However,the ...Room temperature sodium-sulfur(RT Na-S)batteries are gaining extensive attention as attractive alternatives for large-scale energy storage,due to low cost and high abundancy of sodium and sulfur in nature.However,the dilemmas regarding soluble polysulfides(Na_(2)Sn,4<n<8)and the inferior reaction kinetics limit their practical application.To address these issues,we report the activated porous carbon fibers(APCF)with small sulfur molecules(S2-4)confined in ultramicropores,to achieve a reversible single-step reaction in RT Na-S batteries.The mechanism is investigated by the in situ UV/vis spectroscopy,which demonstrates Na2S is the only product during the whole discharge process.Moreover,the hierarchical carbon structure can enhance areal sulfur loading without sacrificing the capacity due to thorough contact between electrolyte and sulfur electrode.As a consequence,the APCF electrode with 38 wt%sulfur(APCF-38S)delivers a high initial reversible specific capacity of 1412 mAh g^(-1) and 10.6mAh cm^(-2)(avg.areal sulfur loading:7.5 mg cm^(-2))at 0.1 C(1C=1675 mA g^(-1)),revealing high degree of sulfur utilization.This study provides a new strategy for the development of high areal capacity RT Na-S batteries.展开更多
Magnesium oxide was found to have high-phosphate-affinity as an effective component to enhance the phosphate removal ability of common adsorbent materials.However,the currently prepared MgO-based hybrid adsorbents by ...Magnesium oxide was found to have high-phosphate-affinity as an effective component to enhance the phosphate removal ability of common adsorbent materials.However,the currently prepared MgO-based hybrid adsorbents by conventional methods still suffer from the limited low loading of MgO and inferior removal performances,much far away from practical application.In this study,an ingenious carbon coated MgO nanocomposite is designed by directly burning magnesium in CO_(2),a well-known textbook reaction.X-ray diffraction analysis,scanning electron microscope and aberration-corrected high-resolution transmission electron microscope demonstrate the sample is well prepared.Consequently,the high content of nanosized MgO combined with defect-rich carbon layer brings unprecedented phosphate removal capacity of 1135.0 mg/g,removal rate of 99% and benign compatibility with coexisting anions and solution pH.Furthermore,the removal mechanism is also investigated in detail by characterizing the sample before and after adsorption.展开更多
基金supported by the Beijing Municipal Natural Science Foundation(Grant No.2212022)the National Natural Science Foundation of China(Grant Nos.51725206,52122214,and 52072403)+1 种基金Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2020006)Jiangsu Province Carbon Peak and Neutrality Innovation Program(Industry tackling on prospect and key technology BE2022002-5)。
文摘Aqueous Na-ion batteries(ANIBs)are considered to be promising secondary battery systems for grid-scale energy storage applications and have attracted widespread attention due to their unique merits of rich resources of Na,as well as the inherent safety and low cost of aqueous electrolytes.However,the narrow electrochemical stability widow and high freezing point of traditional dilute aqueous electrolytes restrict their multi-scenario applications.Considering the charge-storage mechanism of ANIBs,the optimization and design of aqueous Nabased electrolytes dominate their low-temperature performance,which is also hot off the press in this field.In this review,we first systematically comb the research progress of the novel electrolytes and point out their remaining challenges in ANIBs.Then our perspectives on how to further improve the low-temperature performance of ANIBs will also be discussed.Finally,this review briefly sheds light on the potential direction of low-temperature ANIBs,which would guide the future design of high-performance aqueous rechargeable batteries.
基金Natural Science Foundation of Jiangsu Province,Grant/Award Number:BK20170036National Natural Science Foundation of China,Grant/Award Numbers:51572129,51772154,51811530100+1 种基金the Materials Characterization Facility of Nanjing University of Science and Technology for XRD,SEM,and TEM experiments.This study was supported by National Natural Science Foundation of China(Nos.51572129,51772154,and 51811530100)Natural Science Foundation of Jiangsu Province(No.BK20170036).
文摘Room temperature sodium-sulfur(RT Na-S)batteries are gaining extensive attention as attractive alternatives for large-scale energy storage,due to low cost and high abundancy of sodium and sulfur in nature.However,the dilemmas regarding soluble polysulfides(Na_(2)Sn,4<n<8)and the inferior reaction kinetics limit their practical application.To address these issues,we report the activated porous carbon fibers(APCF)with small sulfur molecules(S2-4)confined in ultramicropores,to achieve a reversible single-step reaction in RT Na-S batteries.The mechanism is investigated by the in situ UV/vis spectroscopy,which demonstrates Na2S is the only product during the whole discharge process.Moreover,the hierarchical carbon structure can enhance areal sulfur loading without sacrificing the capacity due to thorough contact between electrolyte and sulfur electrode.As a consequence,the APCF electrode with 38 wt%sulfur(APCF-38S)delivers a high initial reversible specific capacity of 1412 mAh g^(-1) and 10.6mAh cm^(-2)(avg.areal sulfur loading:7.5 mg cm^(-2))at 0.1 C(1C=1675 mA g^(-1)),revealing high degree of sulfur utilization.This study provides a new strategy for the development of high areal capacity RT Na-S batteries.
基金This study was supported by the National Key R&D Program of China through grant 2018YFC1900102A portion of this work was conducted at Argonne National Laboratory.Argonne National Laboratory is operated for DOE Office of Science by UChicago Argonne,LLC,under contract number DE-AC02-06CH11357This study was performed,in part,at the Center for Nanoscale Materials,a US Department of Energy Office of Science User Facility,and supported by the US Department of Energy,Office of Science,under Contract No.DE-AC02-06CH11357.
文摘Magnesium oxide was found to have high-phosphate-affinity as an effective component to enhance the phosphate removal ability of common adsorbent materials.However,the currently prepared MgO-based hybrid adsorbents by conventional methods still suffer from the limited low loading of MgO and inferior removal performances,much far away from practical application.In this study,an ingenious carbon coated MgO nanocomposite is designed by directly burning magnesium in CO_(2),a well-known textbook reaction.X-ray diffraction analysis,scanning electron microscope and aberration-corrected high-resolution transmission electron microscope demonstrate the sample is well prepared.Consequently,the high content of nanosized MgO combined with defect-rich carbon layer brings unprecedented phosphate removal capacity of 1135.0 mg/g,removal rate of 99% and benign compatibility with coexisting anions and solution pH.Furthermore,the removal mechanism is also investigated in detail by characterizing the sample before and after adsorption.