Poly(vinylidenefluoride-co-hexafluoropropylene)(P(VDF-HFP))/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)/P(VDFHFP) sandwiched hybrid solid electrolytes were precisely tailored and successfully fabricated to assemble int...Poly(vinylidenefluoride-co-hexafluoropropylene)(P(VDF-HFP))/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)/P(VDFHFP) sandwiched hybrid solid electrolytes were precisely tailored and successfully fabricated to assemble into allsolid-state lithium-ion batteries,which were systematically evaluated on microstructure,morphology,thermal stability and electrochemical performance.The sandwiched hybrid solid electrolytes can achieve intimate contact with cathode and anode electrodes to present an excellent interfacial stability.Furthermore,the sandwiched hybrid solid electrolytes possess flexible surface,wide electrochemical working window of 4.7 V,high ionic conductivity of 0.763 mS·cm^(-1) and high thermal stability of 460℃,which may contribute to realizing the practical application in all-solid-state lithium-ion batteries.The assembled cells with the hybrid solid electrolytes can quickly stabilize at a specific discharge capacity of 145.4 mAh·g^(-1) at 0.1 C after only 5 cycles and present admirable rate performance.In addition,morphology characterizations of the sandwiched hybrid solid electrolytes after long-term cycles show a relatively integrated structure coating with a compact LATP layer.The investigations afford a promising strategy that the sandwiched hybrid solid electrolytes can overcome the mechanical limitations of the interface between electrodes and inorganic solid electrolytes to provide favorable properties for all-solid-state lithium-ion batteries.展开更多
The seismic reflection and transmission characteristics of a single layer sandwiched between two dissimilar poroelastic solids saturated with two immiscible viscous fluids are investigated. The sandwiched layer is mod...The seismic reflection and transmission characteristics of a single layer sandwiched between two dissimilar poroelastic solids saturated with two immiscible viscous fluids are investigated. The sandwiched layer is modeled as a porous solid with finite thickness. The propagation of waves is represented with potential functions. The displacements of particles in different phases of the aggregate are defined in terms of these potential functions. Due to the presence of viscosity in pore fluids, the reflected and transmitted waves are inhomogeneous in nature, i.e., with different directions of propagation and attenuation. The closed-form analytical expressions for reflection and transmission coefficients are derived theoretically for appropriate boundary conditions. These expressions are calculated as a non-singular system of linear algebraic equations and depend on the various parameters involved in this non-singular system. Hence,numerical examples are studied to determine the effects of various properties of the sandwich layer on reflection and transmission coefficients. The essential features of layer thickness, incident direction, wave frequency, liquidsaturation and capillary pressure of the porous layer on reflection and transmission coefficients are depicted graphically and discussed. The analysis shows that reflection and transmission coefficients are strongly associated with incident direction and various properties of the porous layer.展开更多
Sandwiched functionally-graded piezoelectric semiconductor(FGPS)plates possess high strength and excellent piezoelectric and semiconductor properties,and have significant potential applications in micro-electro-mechan...Sandwiched functionally-graded piezoelectric semiconductor(FGPS)plates possess high strength and excellent piezoelectric and semiconductor properties,and have significant potential applications in micro-electro-mechanical systems.The multi-field coupling and free vibration of a sandwiched FGPS plate are studied,and the governing equation and natural frequency are derived with the consideration of electron movement.The material properties in the functionally-graded layers are assumed to vary smoothly,and the first-order shear deformation theory is introduced to derive the multi-field coupling in the plate.The total strain energy of the plate is obtained,and the governing equations are presented by using Hamilton’s principle.By introducing the boundary conditions,the coupling physical fields are solved.In numerical examples,the natural frequencies of sandwiched FGPS plates under different geometrical and physical parameters are discussed.It is found that the initial electron density can be used to modulate the natural frequencies and vibrational displacement of sandwiched FGPS plates in the case of nano-size.The effects of the material properties of FGPS layers on the natural frequencies are also examined in detail.展开更多
以泡沫铝芯三明治板为研究对象,采用混响室隔声测试研究铺设阻尼层对其隔声量的影响。基于统计能量法理论,用VA One软件对其进行隔声量仿真分析及建模验证。基于验证模型,进一步分析了阻尼材料厚度及材料密度对复合板隔声量的影响。试...以泡沫铝芯三明治板为研究对象,采用混响室隔声测试研究铺设阻尼层对其隔声量的影响。基于统计能量法理论,用VA One软件对其进行隔声量仿真分析及建模验证。基于验证模型,进一步分析了阻尼材料厚度及材料密度对复合板隔声量的影响。试验结果表明,铺设6 mm阻尼对泡沫铝芯三明治板整体隔声性能提高,尤其是高频区域隔声量有显著提升,高达10 d B。VA One统计能量法仿真预测结果表明,对铺设阻尼的泡沫铝芯三明治板进行隔声量趋势预测计算是可行有效的,且参数调研结果表明,阻尼层厚度对三明治板隔声量有一定程度影响,阻尼厚度每增加1 mm高频区域隔声量提高约2 d B;阻尼材料密度对复合板隔声量影响不大。相关结果为泡沫铝芯三明治板隔声优化提供参考。展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.51874046 and 51404038)the Outstanding Youth Foundation of Hubei Province (No.2020CFA090)。
文摘Poly(vinylidenefluoride-co-hexafluoropropylene)(P(VDF-HFP))/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)/P(VDFHFP) sandwiched hybrid solid electrolytes were precisely tailored and successfully fabricated to assemble into allsolid-state lithium-ion batteries,which were systematically evaluated on microstructure,morphology,thermal stability and electrochemical performance.The sandwiched hybrid solid electrolytes can achieve intimate contact with cathode and anode electrodes to present an excellent interfacial stability.Furthermore,the sandwiched hybrid solid electrolytes possess flexible surface,wide electrochemical working window of 4.7 V,high ionic conductivity of 0.763 mS·cm^(-1) and high thermal stability of 460℃,which may contribute to realizing the practical application in all-solid-state lithium-ion batteries.The assembled cells with the hybrid solid electrolytes can quickly stabilize at a specific discharge capacity of 145.4 mAh·g^(-1) at 0.1 C after only 5 cycles and present admirable rate performance.In addition,morphology characterizations of the sandwiched hybrid solid electrolytes after long-term cycles show a relatively integrated structure coating with a compact LATP layer.The investigations afford a promising strategy that the sandwiched hybrid solid electrolytes can overcome the mechanical limitations of the interface between electrodes and inorganic solid electrolytes to provide favorable properties for all-solid-state lithium-ion batteries.
文摘The seismic reflection and transmission characteristics of a single layer sandwiched between two dissimilar poroelastic solids saturated with two immiscible viscous fluids are investigated. The sandwiched layer is modeled as a porous solid with finite thickness. The propagation of waves is represented with potential functions. The displacements of particles in different phases of the aggregate are defined in terms of these potential functions. Due to the presence of viscosity in pore fluids, the reflected and transmitted waves are inhomogeneous in nature, i.e., with different directions of propagation and attenuation. The closed-form analytical expressions for reflection and transmission coefficients are derived theoretically for appropriate boundary conditions. These expressions are calculated as a non-singular system of linear algebraic equations and depend on the various parameters involved in this non-singular system. Hence,numerical examples are studied to determine the effects of various properties of the sandwich layer on reflection and transmission coefficients. The essential features of layer thickness, incident direction, wave frequency, liquidsaturation and capillary pressure of the porous layer on reflection and transmission coefficients are depicted graphically and discussed. The analysis shows that reflection and transmission coefficients are strongly associated with incident direction and various properties of the porous layer.
基金supported by the National Natural Science Foundation of China(Nos.12172236 and 12202289)。
文摘Sandwiched functionally-graded piezoelectric semiconductor(FGPS)plates possess high strength and excellent piezoelectric and semiconductor properties,and have significant potential applications in micro-electro-mechanical systems.The multi-field coupling and free vibration of a sandwiched FGPS plate are studied,and the governing equation and natural frequency are derived with the consideration of electron movement.The material properties in the functionally-graded layers are assumed to vary smoothly,and the first-order shear deformation theory is introduced to derive the multi-field coupling in the plate.The total strain energy of the plate is obtained,and the governing equations are presented by using Hamilton’s principle.By introducing the boundary conditions,the coupling physical fields are solved.In numerical examples,the natural frequencies of sandwiched FGPS plates under different geometrical and physical parameters are discussed.It is found that the initial electron density can be used to modulate the natural frequencies and vibrational displacement of sandwiched FGPS plates in the case of nano-size.The effects of the material properties of FGPS layers on the natural frequencies are also examined in detail.
文摘以泡沫铝芯三明治板为研究对象,采用混响室隔声测试研究铺设阻尼层对其隔声量的影响。基于统计能量法理论,用VA One软件对其进行隔声量仿真分析及建模验证。基于验证模型,进一步分析了阻尼材料厚度及材料密度对复合板隔声量的影响。试验结果表明,铺设6 mm阻尼对泡沫铝芯三明治板整体隔声性能提高,尤其是高频区域隔声量有显著提升,高达10 d B。VA One统计能量法仿真预测结果表明,对铺设阻尼的泡沫铝芯三明治板进行隔声量趋势预测计算是可行有效的,且参数调研结果表明,阻尼层厚度对三明治板隔声量有一定程度影响,阻尼厚度每增加1 mm高频区域隔声量提高约2 d B;阻尼材料密度对复合板隔声量影响不大。相关结果为泡沫铝芯三明治板隔声优化提供参考。
