The water-quenched(WQ)2195 Al−Li alloy was subjected to stretching at different temperatures,from room temperature(RT)to−196℃(CT),to investigate the effect of cryogenic deformation on the aging precipitation behavior...The water-quenched(WQ)2195 Al−Li alloy was subjected to stretching at different temperatures,from room temperature(RT)to−196℃(CT),to investigate the effect of cryogenic deformation on the aging precipitation behaviors and mechanical properties.The precipitation kinetics of the T1 phase and the microstructures in peak aging state were investigated through the differential scanning calorimetric(DSC)tests and electron microscopy observation.The results show that−196℃deformation produces a high dislocation density,which promotes the precipitation of the T1 phase and refines its sizes significantly.In addition,the grain boundary precipitates(GBPs)of−196℃-stretched samples are suppressed considerably due to the high dislocation density in the grain interiors,which increases the ductility.In comparison,the strength remains nearly constant.Thus,it is indicated that cryogenic forming has the potential to provide the shape and property control for the manufacture of critical components of aluminum alloys.展开更多
High-pressure electrides,characterized by the presence of interstitial quasi-atoms(ISQs),possess unique electronic structures and physical properties,such as diverse dimensions of electride states exhibiting different...High-pressure electrides,characterized by the presence of interstitial quasi-atoms(ISQs),possess unique electronic structures and physical properties,such as diverse dimensions of electride states exhibiting different superconductivity,which has attracted significant attention.Here,we report a new electron-deficient type of electride Li_(4)Al and identify its phase transition progress with pressurization,where the internal driving force behind phase transitions,bonding characteristics,and superconducting behaviors have been revealed based on first-principles density functional theory.Through analysis of the bonding properties of electride Li_(4)Al,we demonstrate that the ISQs exhibiting increasingly covalent characteristics between Al ions play a critical role in driving the phase transition.Our electron–phonon coupling calculations indicate that all phases exhibit superconducting behaviors.Importantly,we prove that the ISQs behave as free electrons and demonstrate that the factor governing T_(c) is primarily derived from Li-p-hybridized electronic states with ISQ compositions.These electronic states are scattered by low-frequency phonons arising from mixed vibrations of Li and Al affected by ISQs to enhance electron–phonon coupling.Our study largely expands the research scope of electrides,provides new insight for understanding phase transitions,and elucidates the effects of ISQs on superconducting behavior.展开更多
The vip-host chemistry in polymer electrolytes plays a crucial role for all-solid-state Li metal batteries,where the stable operation of such batteries heavily relies on high ion conductivity,strong mechanical prope...The vip-host chemistry in polymer electrolytes plays a crucial role for all-solid-state Li metal batteries,where the stable operation of such batteries heavily relies on high ion conductivity,strong mechanical properties,and stable interfaces of the electrolyte.While traditional ceramic fillers can boost ion conductivity,they fail to improve interfacial stability.In this study,we introduce intermolecular hydrogen bonding into a polyethylene oxide(PEO)-based polymer electrolyte through the incorporation of metal organic framework(MOF)and lithium nitrate additives.The hydrogen on the PEO chain is found to be tightly interacted with the oxygen nodes of UiO-66 MOF and nitrate anions,creating a cross-linked framework that reduces the crystallinity of the PEO and enhances the integrity of composite.This interaction induces a beneficial Li3N and LiF-rich solid electrolyte interphase,ensuring 2000 h of stable lithium metal operation without short-circuits.The strong polysulfide adsorption enables compatibility with high-capacity sulfur cathodes,resulting in solidstate Li-S batteries that can achieve a high capacity of 913.8 mAh·g^(-1)and exhibit stable cycling performance.This work demonstrates the deep understanding of vip-host chemistry in polymer electrolytes and their potential in developing energy-dense solid-state Li metal batteries.展开更多
Born in Penglai,Shandong Province in 1942,Jiang Baolin is currently working as a doctoral supervisor at the Chinese National Academy of Arts.He’s also a committee member and researcher at the China National Academy o...Born in Penglai,Shandong Province in 1942,Jiang Baolin is currently working as a doctoral supervisor at the Chinese National Academy of Arts.He’s also a committee member and researcher at the China National Academy of Painting.He graduated from Zhejiang Academy of Fine Arts(now China Academy of Art),studying under such masters as Lu Yanshao and Gu Kunbo,and later pursued his master’s degree at the Central Academy of Fine Arts,sitting at the feet of masters like Li Keran.展开更多
基金financially supported by the National Key Research and Development Program of China (No. 2019YFA0708801)the National Natural Science Foundation of China (No. 51875125)。
文摘The water-quenched(WQ)2195 Al−Li alloy was subjected to stretching at different temperatures,from room temperature(RT)to−196℃(CT),to investigate the effect of cryogenic deformation on the aging precipitation behaviors and mechanical properties.The precipitation kinetics of the T1 phase and the microstructures in peak aging state were investigated through the differential scanning calorimetric(DSC)tests and electron microscopy observation.The results show that−196℃deformation produces a high dislocation density,which promotes the precipitation of the T1 phase and refines its sizes significantly.In addition,the grain boundary precipitates(GBPs)of−196℃-stretched samples are suppressed considerably due to the high dislocation density in the grain interiors,which increases the ductility.In comparison,the strength remains nearly constant.Thus,it is indicated that cryogenic forming has the potential to provide the shape and property control for the manufacture of critical components of aluminum alloys.
基金supported by the National Key Research and Development Program of China (Grant Nos.2023YFA1406200 and 2022YFA-1405500)the National Natural Science Foundation of China (Grant Nos.12304021 and 52072188)+3 种基金Zhejiang Provincial Natural Science Foundation of China (Grant Nos.LQ23A040004 and MS26A040028)Natural Science Foundation of Ningbo (Grant Nos.2022J091 and ZX2025001430)the Program for Science and Technology Innovation Team in Zhejiang (Grant No.2021R01004)the Program for Changjiang Scholars and Innovative Research Team in University (Grant No.IRT_15R23)。
文摘High-pressure electrides,characterized by the presence of interstitial quasi-atoms(ISQs),possess unique electronic structures and physical properties,such as diverse dimensions of electride states exhibiting different superconductivity,which has attracted significant attention.Here,we report a new electron-deficient type of electride Li_(4)Al and identify its phase transition progress with pressurization,where the internal driving force behind phase transitions,bonding characteristics,and superconducting behaviors have been revealed based on first-principles density functional theory.Through analysis of the bonding properties of electride Li_(4)Al,we demonstrate that the ISQs exhibiting increasingly covalent characteristics between Al ions play a critical role in driving the phase transition.Our electron–phonon coupling calculations indicate that all phases exhibit superconducting behaviors.Importantly,we prove that the ISQs behave as free electrons and demonstrate that the factor governing T_(c) is primarily derived from Li-p-hybridized electronic states with ISQ compositions.These electronic states are scattered by low-frequency phonons arising from mixed vibrations of Li and Al affected by ISQs to enhance electron–phonon coupling.Our study largely expands the research scope of electrides,provides new insight for understanding phase transitions,and elucidates the effects of ISQs on superconducting behavior.
基金financially supported by the National Natural Science Foundation of China(Nos.22272080(M.Y.)and 52272218(H.X.))the Fundamental Research Funds for the Central Universities(No.2242024k30047).
文摘The vip-host chemistry in polymer electrolytes plays a crucial role for all-solid-state Li metal batteries,where the stable operation of such batteries heavily relies on high ion conductivity,strong mechanical properties,and stable interfaces of the electrolyte.While traditional ceramic fillers can boost ion conductivity,they fail to improve interfacial stability.In this study,we introduce intermolecular hydrogen bonding into a polyethylene oxide(PEO)-based polymer electrolyte through the incorporation of metal organic framework(MOF)and lithium nitrate additives.The hydrogen on the PEO chain is found to be tightly interacted with the oxygen nodes of UiO-66 MOF and nitrate anions,creating a cross-linked framework that reduces the crystallinity of the PEO and enhances the integrity of composite.This interaction induces a beneficial Li3N and LiF-rich solid electrolyte interphase,ensuring 2000 h of stable lithium metal operation without short-circuits.The strong polysulfide adsorption enables compatibility with high-capacity sulfur cathodes,resulting in solidstate Li-S batteries that can achieve a high capacity of 913.8 mAh·g^(-1)and exhibit stable cycling performance.This work demonstrates the deep understanding of vip-host chemistry in polymer electrolytes and their potential in developing energy-dense solid-state Li metal batteries.
文摘Born in Penglai,Shandong Province in 1942,Jiang Baolin is currently working as a doctoral supervisor at the Chinese National Academy of Arts.He’s also a committee member and researcher at the China National Academy of Painting.He graduated from Zhejiang Academy of Fine Arts(now China Academy of Art),studying under such masters as Lu Yanshao and Gu Kunbo,and later pursued his master’s degree at the Central Academy of Fine Arts,sitting at the feet of masters like Li Keran.
