The dynamic behaviors of a horizontal piping structure with an elbow due to the two-phase flow excitation are experimentally investigated.The effects of flow patterns and superficial velocities on the pressure pulsati...The dynamic behaviors of a horizontal piping structure with an elbow due to the two-phase flow excitation are experimentally investigated.The effects of flow patterns and superficial velocities on the pressure pulsations and vibration responses are evaluated in detail.A strong partition coupling algorithm is used to calculate the flow-induced vibration(FIV)responses of the pipe,and the theoretical values agree well with the experimental results.It is found that the lateral and axial vibration responses of the bend pipe are related to the momentum flux of the two-phase flow,and the vibration amplitudes of the pipe increase with an increase in the liquid mass flux.The vertical vibration responses are strongly affected by the flow pattern,and the maximum response occurs in the transition region from the slug flow to the bubbly flow.Moreover,the standard deviation(STD)amplitudes of the pipe vibration in three directions increase with an increase in the gas flux for both the slug and bubbly flows.The blockage of liquid slugs at the elbow section is found to strengthen the vibration amplitude of the bend pipe,and the water-blocking phenomenon disappears as the superficial gas velocity increases.展开更多
All-solid-state lithium batteries have emerged as a priority candidate for the next generation of safe and energy-dense energy storage devices surpassing state-of-art lithium-ion batteries.Among multitudinous solid-st...All-solid-state lithium batteries have emerged as a priority candidate for the next generation of safe and energy-dense energy storage devices surpassing state-of-art lithium-ion batteries.Among multitudinous solid-state batteries based on solid electrolytes(SEs),sulfide SEs have attracted burgeoning scrutiny due to their superior ionic conductivity and outstanding formability.However,from the perspective of their practical applications concerning cell integration and production,it is still extremely challenging to constructing compatible electrolyte/electrode interfaces and developing available scale processing technologies.This review presents a critical overview of the current underlying understanding of interfacial issues and analyzes the main processing challenges faced by sulfide-based all-solid-state batteries from the aspects of cost-effective and energy-dense design.Besides,the corresponding approaches involving interface engineering and processing protocols for addressing these issues and challenges are summarized.Fundamental and engineering perspectives on future development avenues toward practical application of high energy,safety,and long-life sulfide-based all-solid-state batteries are ultimately provided.展开更多
All-solid-state Li metal batteries(ASSLMBs)have been considered the most promising candidates for next-generation energy storage devices owing to their high-energy density and safety.However,some obstacles such as thi...All-solid-state Li metal batteries(ASSLMBs)have been considered the most promising candidates for next-generation energy storage devices owing to their high-energy density and safety.However,some obstacles such as thick solid electrolyte(SSEs)and unstable interface between the solid-state electrolytes(SSEs)and the electrodes have restricted the practical application of ASSLBs.Here,the scalable polyimide(PI)film reinforced asymmetric ultrathin(~20μm)composite solid electrolyte(AU-CSE)with a ceramic-rich layer and polymer-rich layer is fabricated by a both-side casting method and rolling process.The ceramic-rich layer not only acts as a“securer”to inhibit the lithium dendrite growth but also redistributes Li-ions uniform deposition,while the polymer-rich layer improves the compatibility with cathode materials.As a result,the obtained AU-CSE demonstrates an ionic conductivity of 1.44×10^(−4)S cm^(−1)at 35°C.The PI-reinforced AU-CSE enables Li/Li symmetric cell stable cycling over 1200 h at_(0.2)mA cm^(−2)and_(0.2)mAh cm^(−2).Li/LiNi_(0.6)Co_(0.2)Mn_(0.2)O2 and Li/LiFePO4 ASSLMBs achieve superior performances at 35°C.This study provides a new way of solving the interface problems between SSEs and electrodes and developing high-energy-density ASSLMBs for practical applications.展开更多
基金supported by the National Natural Science Foundation of China(Nos.U2141244,11922208,11932011,and 12121002)the National Science and Technology Major Project of the Ministry of Science and Technology of China(No.2019ZX06004001)the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University of China(No.SL2021ZD104)。
文摘The dynamic behaviors of a horizontal piping structure with an elbow due to the two-phase flow excitation are experimentally investigated.The effects of flow patterns and superficial velocities on the pressure pulsations and vibration responses are evaluated in detail.A strong partition coupling algorithm is used to calculate the flow-induced vibration(FIV)responses of the pipe,and the theoretical values agree well with the experimental results.It is found that the lateral and axial vibration responses of the bend pipe are related to the momentum flux of the two-phase flow,and the vibration amplitudes of the pipe increase with an increase in the liquid mass flux.The vertical vibration responses are strongly affected by the flow pattern,and the maximum response occurs in the transition region from the slug flow to the bubbly flow.Moreover,the standard deviation(STD)amplitudes of the pipe vibration in three directions increase with an increase in the gas flux for both the slug and bubbly flows.The blockage of liquid slugs at the elbow section is found to strengthen the vibration amplitude of the bend pipe,and the water-blocking phenomenon disappears as the superficial gas velocity increases.
基金National Natural Science Foundation of China,Grant/Award Numbers:51872027,U21A2080Natural Science Foundation of Beijing Municipality,Grant/Award Number:Z200011。
文摘All-solid-state lithium batteries have emerged as a priority candidate for the next generation of safe and energy-dense energy storage devices surpassing state-of-art lithium-ion batteries.Among multitudinous solid-state batteries based on solid electrolytes(SEs),sulfide SEs have attracted burgeoning scrutiny due to their superior ionic conductivity and outstanding formability.However,from the perspective of their practical applications concerning cell integration and production,it is still extremely challenging to constructing compatible electrolyte/electrode interfaces and developing available scale processing technologies.This review presents a critical overview of the current underlying understanding of interfacial issues and analyzes the main processing challenges faced by sulfide-based all-solid-state batteries from the aspects of cost-effective and energy-dense design.Besides,the corresponding approaches involving interface engineering and processing protocols for addressing these issues and challenges are summarized.Fundamental and engineering perspectives on future development avenues toward practical application of high energy,safety,and long-life sulfide-based all-solid-state batteries are ultimately provided.
基金National Natural Science Foundation of China,Grant/Award Numbers:U21A2080,51872027Beijing Natural Science Foundation,Grant/Award Number:Z200011。
文摘All-solid-state Li metal batteries(ASSLMBs)have been considered the most promising candidates for next-generation energy storage devices owing to their high-energy density and safety.However,some obstacles such as thick solid electrolyte(SSEs)and unstable interface between the solid-state electrolytes(SSEs)and the electrodes have restricted the practical application of ASSLBs.Here,the scalable polyimide(PI)film reinforced asymmetric ultrathin(~20μm)composite solid electrolyte(AU-CSE)with a ceramic-rich layer and polymer-rich layer is fabricated by a both-side casting method and rolling process.The ceramic-rich layer not only acts as a“securer”to inhibit the lithium dendrite growth but also redistributes Li-ions uniform deposition,while the polymer-rich layer improves the compatibility with cathode materials.As a result,the obtained AU-CSE demonstrates an ionic conductivity of 1.44×10^(−4)S cm^(−1)at 35°C.The PI-reinforced AU-CSE enables Li/Li symmetric cell stable cycling over 1200 h at_(0.2)mA cm^(−2)and_(0.2)mAh cm^(−2).Li/LiNi_(0.6)Co_(0.2)Mn_(0.2)O2 and Li/LiFePO4 ASSLMBs achieve superior performances at 35°C.This study provides a new way of solving the interface problems between SSEs and electrodes and developing high-energy-density ASSLMBs for practical applications.
