Adjusting the concentration of free carriers is a direct strategy to achieve ideal negative permittivity.Employing chemical methods for atypical ion doping is an effective approach to regulate the concentration of fre...Adjusting the concentration of free carriers is a direct strategy to achieve ideal negative permittivity.Employing chemical methods for atypical ion doping is an effective approach to regulate the concentration of free carriers.Owing to the A-site tunability of perovskite manganese oxides,doping with multivalent ions becomes particularly favorable.In this study,to realize temperature-stable negative permittivity,mono-phase La_(1-x-y)Ca_(x)K_(y)MnO_(3)(named LCKMO)perovskite crystals having diverse compositions were prepared using an ultra-high-alkaline hydrothermal method.Heterovalent ion doping(La^(3+),Ca^(2+),and K^(+))at the A site within the perovskite crystal structure occurred with the help of the disproportionation reaction of Mn ions at the B site under extreme hydrothermal conditions.By adjusting the La/Ca ratio,we can vary the doping content of K^(+).Experimental results demonstrate that as the concentration of K^(+)increases,so does the concentration of Mn oxide states,indicating that the increase in free carriers contributes to enhanced negative permittivity and reduced dielectric loss.This work thus pioneers a novel synthetic pathway for the creation and design of materials having negative permittivity.展开更多
Strategic control over semiconductor conductivity and charge type is fundamental to electronic devices,giving rise to a plethora of groundbreaking inventions[1].Doping serves as the cornerstone for modulating the n-ty...Strategic control over semiconductor conductivity and charge type is fundamental to electronic devices,giving rise to a plethora of groundbreaking inventions[1].Doping serves as the cornerstone for modulating the n-type or p-type characteristics of semiconductors and adjusting the carriers concentration[2,3].展开更多
Lithium metal batteries(LMBs)have gained increasing attention owing to high energy density for large-scale energy storage applications.However,serious side reactions between Li anodes and organic electrolytes lead to ...Lithium metal batteries(LMBs)have gained increasing attention owing to high energy density for large-scale energy storage applications.However,serious side reactions between Li anodes and organic electrolytes lead to low Columbic efficiency and Li dendrites.Although progress has been achieved in constructing electrode structures,the interfacial instability of Li anodes is still challenging.Solvation chemistry significantly affects the electrolyte properties and interfacial reactions,but the reaction mechanisms and the roles of each component in electrolytes are still vague.This review spotlights the recent development of electrolyte regulation with concentration and composition adjustments,aiming to understanding the correlation between solvation structures and Li anode stability.Further perspectives on the solvation design are provided in light of anode interfacial stability in LMBs.展开更多
基金supported by the Natural Science Foundation of Jilin Province No.20240101171JCExperimental Technology Project of Jilin University(SYXM2024a004)+1 种基金Jilin Science and Technology Development Plan Project(SKL202402007)the National Key R&D Program of China(2023YFA1506300).
文摘Adjusting the concentration of free carriers is a direct strategy to achieve ideal negative permittivity.Employing chemical methods for atypical ion doping is an effective approach to regulate the concentration of free carriers.Owing to the A-site tunability of perovskite manganese oxides,doping with multivalent ions becomes particularly favorable.In this study,to realize temperature-stable negative permittivity,mono-phase La_(1-x-y)Ca_(x)K_(y)MnO_(3)(named LCKMO)perovskite crystals having diverse compositions were prepared using an ultra-high-alkaline hydrothermal method.Heterovalent ion doping(La^(3+),Ca^(2+),and K^(+))at the A site within the perovskite crystal structure occurred with the help of the disproportionation reaction of Mn ions at the B site under extreme hydrothermal conditions.By adjusting the La/Ca ratio,we can vary the doping content of K^(+).Experimental results demonstrate that as the concentration of K^(+)increases,so does the concentration of Mn oxide states,indicating that the increase in free carriers contributes to enhanced negative permittivity and reduced dielectric loss.This work thus pioneers a novel synthetic pathway for the creation and design of materials having negative permittivity.
基金supported by the Research Grants Council of Hong Kong(C4001-23GF)Guangdong Basic and Applied Basic Research Foundation(2019B151502028)CUHK Postgraduate Studentship.
文摘Strategic control over semiconductor conductivity and charge type is fundamental to electronic devices,giving rise to a plethora of groundbreaking inventions[1].Doping serves as the cornerstone for modulating the n-type or p-type characteristics of semiconductors and adjusting the carriers concentration[2,3].
基金supported by the National Natural Science Foundation of China(No.52171215),the 111 project(No.B12015)Haihe Laboratory of Sustainable Chemical Transformations.
文摘Lithium metal batteries(LMBs)have gained increasing attention owing to high energy density for large-scale energy storage applications.However,serious side reactions between Li anodes and organic electrolytes lead to low Columbic efficiency and Li dendrites.Although progress has been achieved in constructing electrode structures,the interfacial instability of Li anodes is still challenging.Solvation chemistry significantly affects the electrolyte properties and interfacial reactions,but the reaction mechanisms and the roles of each component in electrolytes are still vague.This review spotlights the recent development of electrolyte regulation with concentration and composition adjustments,aiming to understanding the correlation between solvation structures and Li anode stability.Further perspectives on the solvation design are provided in light of anode interfacial stability in LMBs.
