Comparative voltammetry and differential double-layer capacitance studies were performed to evaluate interfacial interactions between cnalcopyrite（CuFeS2） and n-isopropyl xanthate（X） in the presence of ammonium bi...Comparative voltammetry and differential double-layer capacitance studies were performed to evaluate interfacial interactions between cnalcopyrite（CuFeS2） and n-isopropyl xanthate（X） in the presence of ammonium bisulfite/39wt%SO2 and caustic starch at different pH values.Raman spectroscopy,Fourier transform infrared（FTIR） spectroscopy,contact angle measurements,and microflotation tests were used to establish the type and extent of xanthate adsorption as well as the species involved under different mineral surface conditions in this study.The results demonstrate that the species that favor a greater hydrophobicity of chalcopyrite are primarily CuX and S^0,whereas oxides and hydroxides of Cu and Fe as well as an excess of starch decrease the hydrophobicity.A conditioning of the mineral surface with ammonium bisulfite/39wt%SO2 at pH 6 promotes the activation of surface and enhances the xanthate adsorption.However,this effect is diminished at pH ≥ 8,when an excess of starch is added during the preconditioning step.展开更多
Unstable Zn interface caused by rampant dendrite growth and parasitic side reactions always hinders the practical application of aqueous zinc metal batteries(AZMBs),Herein,tyrosine(Tyr)with high molecular polarity was...Unstable Zn interface caused by rampant dendrite growth and parasitic side reactions always hinders the practical application of aqueous zinc metal batteries(AZMBs),Herein,tyrosine(Tyr)with high molecular polarity was introduced into aqueous electrolyte to modulate the interfacial electrochemistry of Zn anode.In AZMBs,the positively charged side of Tyr can be well adsorbed on the surface of Zn anode to form a water-poor layer,and the exposed carboxylate side can be easily coordinated with Zn^(2+),favoring inducing uniform plating of Zn^(2+)and inhibiting the occurrence of water-induced side reactions.These in turn enable the achievement of highly stable Zn anode.Accordingly,the Zn anodes achieve outstanding cyclic stability(3000 h at 2 mA cm^(-2),2 mA h cm^(-2)and 1300 h at 5 mA cm^(-2),5 mA h cm^(-2)),high average Coulombic efficiency(99.4%over 3200 cycles),and high depth of discharge(80%for 500 h).Besides,the assembled Zn‖NaV_(3)O_(8)·1.5H_(2)O full cells deliver remarkable capacity retention and ultra-long lifetime(61.8%over 6650 cycles at 5 A g^(-1))and enhanced rate capability(169 mA h g^(-1)at 5 A g^(-1)).The work may promote the design and deep understanding of electrolyte additives with high molecular polarity for high-performance AZMBs.展开更多
Solid-solid interface contact and slow ion transport restrict solid-state polymer electrolytes practical application.The differences in interface structure design significantly influence the interfacial Li^(+)transpor...Solid-solid interface contact and slow ion transport restrict solid-state polymer electrolytes practical application.The differences in interface structure design significantly influence the interfacial Li^(+)transport and diffusion as well as the Li atom nucleation,resulting in substantial variations in the macroscopic performance of polymer electrolytes-based solid-state Li metal batteries.Here,ceramic-polymer composite electrolytes(CPCEs)composed of polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP)polymer and Li_(6.75)La_(3)Zr_(1.75)Ta_(0.25)O_(12)(LLZTO)filler has been chosen as the demo to demonstrate that the interfacial electrochemistry between CPCEs and Li anode is not only affected by the physical interface contact but also associated with the internal/interfacial Li^(+)transport mechanism.This work shows that“point to point”Li^(+)diffusion,slow uneven interfacial Li^(+)transport in CPCEs with poor ionic conductivity and rough surface lead to uneven Li atom nucleation,leading to Li dendrites growth.While,the CPCEs with high ionic conductivity and smooth surface facilitate uniform and rapid ion transport,promoting uniform Li nucleation and transverse diffusion.This work highlights the importance of the interface structure design of polymer electrolytes for Li metal interface stability in polymer electrolytes-based quasi-solid-state batteries and provides valuable insights into the interfacial electrochemistry of solidstate batteries.展开更多
Rechargeable zinc-ion batteries with mild aqueous electrolytes are one of the most promising systems for large-scale energy storage as a result of their inherent safety,low cost,environmental-friendliness,and acceptab...Rechargeable zinc-ion batteries with mild aqueous electrolytes are one of the most promising systems for large-scale energy storage as a result of their inherent safety,low cost,environmental-friendliness,and acceptable energy density.However,zinc metal anodes always suffer from unwanted dendrite growth,leading to low Coulombic efficiency and poor cycle stability and during the repeated plating/stripping processes,which substantially restrict their further development and application.To solve these critical issues,a lot of research works have been dedicated to overcoming the drawbacks associated with zinc metal anodes.In this overview,the working mechanisms and existing issues of the zinc metal anodes are first briefly outlined.Moreover,we look into the ongoing processes of the different strategies for achieving highly stable and dendrite-free zinc metal anodes,including crystal engineering,structural engineering,coating engineering,electrolyte engineering,and separator engineering.Finally,some challenges being faced and prospects in this field are provided,together with guiding significant research directions in the future.展开更多
基金supported by Universidad Autónoma de San Luis Potosí(No.PROMEP/UASLP/12/CA15)
文摘Comparative voltammetry and differential double-layer capacitance studies were performed to evaluate interfacial interactions between cnalcopyrite（CuFeS2） and n-isopropyl xanthate（X） in the presence of ammonium bisulfite/39wt%SO2 and caustic starch at different pH values.Raman spectroscopy,Fourier transform infrared（FTIR） spectroscopy,contact angle measurements,and microflotation tests were used to establish the type and extent of xanthate adsorption as well as the species involved under different mineral surface conditions in this study.The results demonstrate that the species that favor a greater hydrophobicity of chalcopyrite are primarily CuX and S^0,whereas oxides and hydroxides of Cu and Fe as well as an excess of starch decrease the hydrophobicity.A conditioning of the mineral surface with ammonium bisulfite/39wt%SO2 at pH 6 promotes the activation of surface and enhances the xanthate adsorption.However,this effect is diminished at pH ≥ 8,when an excess of starch is added during the preconditioning step.
基金the financial support from the Foshan Talents Special Foundation(BKBS202003).
文摘Unstable Zn interface caused by rampant dendrite growth and parasitic side reactions always hinders the practical application of aqueous zinc metal batteries(AZMBs),Herein,tyrosine(Tyr)with high molecular polarity was introduced into aqueous electrolyte to modulate the interfacial electrochemistry of Zn anode.In AZMBs,the positively charged side of Tyr can be well adsorbed on the surface of Zn anode to form a water-poor layer,and the exposed carboxylate side can be easily coordinated with Zn^(2+),favoring inducing uniform plating of Zn^(2+)and inhibiting the occurrence of water-induced side reactions.These in turn enable the achievement of highly stable Zn anode.Accordingly,the Zn anodes achieve outstanding cyclic stability(3000 h at 2 mA cm^(-2),2 mA h cm^(-2)and 1300 h at 5 mA cm^(-2),5 mA h cm^(-2)),high average Coulombic efficiency(99.4%over 3200 cycles),and high depth of discharge(80%for 500 h).Besides,the assembled Zn‖NaV_(3)O_(8)·1.5H_(2)O full cells deliver remarkable capacity retention and ultra-long lifetime(61.8%over 6650 cycles at 5 A g^(-1))and enhanced rate capability(169 mA h g^(-1)at 5 A g^(-1)).The work may promote the design and deep understanding of electrolyte additives with high molecular polarity for high-performance AZMBs.
基金supported by the National Key Research and Development Project Intergovernmental International Science and Technology Innovation Cooperation(2022YFE0109400)National Key Research and Development Program of China(2023YFB2405800)Leading Edge Technology of Jiangsu Province(BK20232022,BK20220009)。
文摘Solid-solid interface contact and slow ion transport restrict solid-state polymer electrolytes practical application.The differences in interface structure design significantly influence the interfacial Li^(+)transport and diffusion as well as the Li atom nucleation,resulting in substantial variations in the macroscopic performance of polymer electrolytes-based solid-state Li metal batteries.Here,ceramic-polymer composite electrolytes(CPCEs)composed of polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP)polymer and Li_(6.75)La_(3)Zr_(1.75)Ta_(0.25)O_(12)(LLZTO)filler has been chosen as the demo to demonstrate that the interfacial electrochemistry between CPCEs and Li anode is not only affected by the physical interface contact but also associated with the internal/interfacial Li^(+)transport mechanism.This work shows that“point to point”Li^(+)diffusion,slow uneven interfacial Li^(+)transport in CPCEs with poor ionic conductivity and rough surface lead to uneven Li atom nucleation,leading to Li dendrites growth.While,the CPCEs with high ionic conductivity and smooth surface facilitate uniform and rapid ion transport,promoting uniform Li nucleation and transverse diffusion.This work highlights the importance of the interface structure design of polymer electrolytes for Li metal interface stability in polymer electrolytes-based quasi-solid-state batteries and provides valuable insights into the interfacial electrochemistry of solidstate batteries.
基金supported by the National Natural Science Foundation of China(U1802256,21975283,21773118,21875107)the Key Research and Development Program in Jiangsu Province(BE2018122)+2 种基金the Natural Science Foundation of Jiangsu Province(BK20191343)the Fundamental Research Funds for the Central Universities(2022QN1088)the General Research Project of Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization(2022KF03).
文摘Rechargeable zinc-ion batteries with mild aqueous electrolytes are one of the most promising systems for large-scale energy storage as a result of their inherent safety,low cost,environmental-friendliness,and acceptable energy density.However,zinc metal anodes always suffer from unwanted dendrite growth,leading to low Coulombic efficiency and poor cycle stability and during the repeated plating/stripping processes,which substantially restrict their further development and application.To solve these critical issues,a lot of research works have been dedicated to overcoming the drawbacks associated with zinc metal anodes.In this overview,the working mechanisms and existing issues of the zinc metal anodes are first briefly outlined.Moreover,we look into the ongoing processes of the different strategies for achieving highly stable and dendrite-free zinc metal anodes,including crystal engineering,structural engineering,coating engineering,electrolyte engineering,and separator engineering.Finally,some challenges being faced and prospects in this field are provided,together with guiding significant research directions in the future.
