Silver-clad （Bi,Pb）2Sr2Ca2Cu3O10＋x long wires produced by powder-in-tube techniques, which have been recognized as the first generation of the High Temperature Superconducting （HTS） wires, are expected to apply w...Silver-clad （Bi,Pb）2Sr2Ca2Cu3O10＋x long wires produced by powder-in-tube techniques, which have been recognized as the first generation of the High Temperature Superconducting （HTS） wires, are expected to apply widely especially in strong current applications. In this work, the processing, characterization and application of the silver-clad （Bi,Pb）2Sr2Ca2Cu3Ol0＋x HTS wires are summarized. The HTS wires are fabricated using the combination of powder-in-tube technique, and the resulting wires are fully characterized by the means of chemical analyses, microstructural observation, electrical and magnetic measurements. The relationship among fabrication parameters, chemical and microstructural characteristics, and electrical and magnetic properties are analyzed. Applications of the HTS wires have also been introduced according to their strong current behaviors with various prototype devices made.展开更多
Sodium-ion batteries with ZnIn_(2)S_(4)(ZIS)anodes promise a high capacity and abundant resources.However,their inherent low conductivity,large volume expansion and sluggish Na+diffusion limit the development of the w...Sodium-ion batteries with ZnIn_(2)S_(4)(ZIS)anodes promise a high capacity and abundant resources.However,their inherent low conductivity,large volume expansion and sluggish Na+diffusion limit the development of the wide-temperature sodium storage.This study pioneers a scalable synthesis of hierarchical hollow structural ZIS/C heterostructure through in situ confined growth of ZIS nanosheets in porous hollow carbon spheres(PHCSs)via a hydrothermal method.This unique structure exhibits abundant heterostructures to facilitate charge transport,rich porous structures to promote electrolyte wettability,efficient space utilization to relieve volume expansion,as well as interconnected carbon networks to ensure framework stability.Consequently,ZIS/C exhibits exceptional cycling stability with 92%capacity retention after 1000 cycles.Notably,ZIS/C demonstrates good wide-temperature performance operating at–50∼90°C,especially,at–30°C with a capacity of 208 mA h g^(−1)at 0.3A g^(−1).The full cell of ZIS/C||Na_(3)V_(2)(PO_(4))_(3)exhibits excellent high-rate capability(178 mA h g^(−1)at 6A g^(−1)).展开更多
B-containing electrolyte additives are widely used to enhance the cycle performance at low temperature and the rate capability of lithium-ion batteries by constructing an efficient cathode electrolyte interphase(CEI)t...B-containing electrolyte additives are widely used to enhance the cycle performance at low temperature and the rate capability of lithium-ion batteries by constructing an efficient cathode electrolyte interphase(CEI)to facilitate the rapid Li+migration.Nevertheless,its wide-temperature application has been limited by the instability of B-derived CEI layer at high temperature.Herein,dual electrolyte additives,consisting of lithium tetraborate(Li_(2)TB)and 2,4-difluorobiphenyl(FBP),are proposed to boost the widetemperature performances of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM)cathode.Theoretical calculation and electrochemical performances analyses indicate that Li_(2)TB and FBP undergo successive decomposition to form a unique dual-layer CEI.FBP acts as a synergistic filming additive to Li_(2)TB,enhancing the hightemperature performance of NCM cathode while preserving the excellent low-temperature cycle stability and the superior rate capability conferred by Li_(2)TB additive.Therefore,the capacity retention of NCM‖Li cells using optimal FBP-Li_(2)TB dual electrolyte additives increases to 100%after 200 cycles at-10℃,99%after 200 cycles at 25℃,and 83%after 100 cycles at 55℃,respectively,much superior to that of base electrolyte(63%/69%/45%).More surprisingly,galvanostatic c ha rge/discharge experiments at different temperatures reveal that NCM‖Li cells using FBP-Li_(2)TB additives can operate at temperatures ranging from-40℃to 60℃.This synergistic interphase modification utilizing dual electrolyte additives to construct a unique dual-layer CEI adaptive to a wide temperature range,provides valuable insights to the practical applications of NCM cathodes for all-climate batteries.展开更多
Recently,the research team led by Prof.Chen Guang(陈光)at the Engineering Research Center of Materials Behavior and Design,Ministry of Education,Nanjing University of Science and Technology,successfully manufactured a...Recently,the research team led by Prof.Chen Guang(陈光)at the Engineering Research Center of Materials Behavior and Design,Ministry of Education,Nanjing University of Science and Technology,successfully manufactured a new kind of high-temperature polysynthetic twinned(PST)TiAl single展开更多
Applications like solid oxide fuel cells and sensors increasingly demand the possibility to braze ceramics to metals with a good resistance to high temperatures and oxidative atmospheres. Commonly used silver based ac...Applications like solid oxide fuel cells and sensors increasingly demand the possibility to braze ceramics to metals with a good resistance to high temperatures and oxidative atmospheres. Commonly used silver based active filler metals cannot fulfill these requirements, if application temperatures higher than 600℃ occur. Au and Pd based active fillers are too expensive for many fields of use. As one possible solution nickel based active fillers were developed. Due to the high brazing temperatures and the low ductility of nickel based filler metals, the modification of standard nickel based filler metals were necessary to meet the requirements of above mentioned applications. To reduce thermally induced stresses wide brazing gaps and the addition of A1203 and WC particles to the filler metal were applied. In this study, the microstructure of the brazed joints and the thermo-chemical reactions between filler metal, active elements and WC particles were analyzed to understand the mechanism of the so called wide gap active brazing process. With regard to the behavior in typical application oxidation and thermal cycle tests were conducted as well as tensile tests.展开更多
Lithium-sulfur(Li-S)batteries have demonstrated the potential to conquer the energy storage related market due to the extremely high energy density.However,their performances at low temperature are still needed to be ...Lithium-sulfur(Li-S)batteries have demonstrated the potential to conquer the energy storage related market due to the extremely high energy density.However,their performances at low temperature are still needed to be improved to broaden their applications.Therefore,in this review,the basic failure mechanisms and major challenges of Li-S battery at low temperature are categorized as the high desolvation barrier of Li^(+),uncontrolled nucleation and deposition of lithium,polysulfides clustering,and passivation of cathode by film like Li_(2)S.Targeting these major issues,strategies,and advances concerning the design of optimized electrolyte,composite cathode and functional separator are highlighted and discussed.Finally,the suggestions are proposed for the future development of practical Li-S battery working at low temperature scenarios,hoping to accelerate the commercialization process and bring revolution to the energy storage market.展开更多
Thermoelectric conversion technology,capable of directly converting heat into electricity and vice versa,plays a crucial role in both energy supply and temperature control[1].This is particularly crucial in specialize...Thermoelectric conversion technology,capable of directly converting heat into electricity and vice versa,plays a crucial role in both energy supply and temperature control[1].This is particularly crucial in specialized fields,such as deep-space exploration where solar power is ineffective,as well as in miniaturized precision temperature control applications[2].展开更多
文摘Silver-clad （Bi,Pb）2Sr2Ca2Cu3O10＋x long wires produced by powder-in-tube techniques, which have been recognized as the first generation of the High Temperature Superconducting （HTS） wires, are expected to apply widely especially in strong current applications. In this work, the processing, characterization and application of the silver-clad （Bi,Pb）2Sr2Ca2Cu3Ol0＋x HTS wires are summarized. The HTS wires are fabricated using the combination of powder-in-tube technique, and the resulting wires are fully characterized by the means of chemical analyses, microstructural observation, electrical and magnetic measurements. The relationship among fabrication parameters, chemical and microstructural characteristics, and electrical and magnetic properties are analyzed. Applications of the HTS wires have also been introduced according to their strong current behaviors with various prototype devices made.
基金supported by the National Natural Science Foundation of China(U23B2075)the Natural Science Foundation of Shandong Province(ZR202111290333)the China Postdoctoral Science Foundation(2023M730640,2024M750490).
文摘Sodium-ion batteries with ZnIn_(2)S_(4)(ZIS)anodes promise a high capacity and abundant resources.However,their inherent low conductivity,large volume expansion and sluggish Na+diffusion limit the development of the wide-temperature sodium storage.This study pioneers a scalable synthesis of hierarchical hollow structural ZIS/C heterostructure through in situ confined growth of ZIS nanosheets in porous hollow carbon spheres(PHCSs)via a hydrothermal method.This unique structure exhibits abundant heterostructures to facilitate charge transport,rich porous structures to promote electrolyte wettability,efficient space utilization to relieve volume expansion,as well as interconnected carbon networks to ensure framework stability.Consequently,ZIS/C exhibits exceptional cycling stability with 92%capacity retention after 1000 cycles.Notably,ZIS/C demonstrates good wide-temperature performance operating at–50∼90°C,especially,at–30°C with a capacity of 208 mA h g^(−1)at 0.3A g^(−1).The full cell of ZIS/C||Na_(3)V_(2)(PO_(4))_(3)exhibits excellent high-rate capability(178 mA h g^(−1)at 6A g^(−1)).
基金supported by the National Natural Science Foundation of China(No.21972049)。
文摘B-containing electrolyte additives are widely used to enhance the cycle performance at low temperature and the rate capability of lithium-ion batteries by constructing an efficient cathode electrolyte interphase(CEI)to facilitate the rapid Li+migration.Nevertheless,its wide-temperature application has been limited by the instability of B-derived CEI layer at high temperature.Herein,dual electrolyte additives,consisting of lithium tetraborate(Li_(2)TB)and 2,4-difluorobiphenyl(FBP),are proposed to boost the widetemperature performances of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM)cathode.Theoretical calculation and electrochemical performances analyses indicate that Li_(2)TB and FBP undergo successive decomposition to form a unique dual-layer CEI.FBP acts as a synergistic filming additive to Li_(2)TB,enhancing the hightemperature performance of NCM cathode while preserving the excellent low-temperature cycle stability and the superior rate capability conferred by Li_(2)TB additive.Therefore,the capacity retention of NCM‖Li cells using optimal FBP-Li_(2)TB dual electrolyte additives increases to 100%after 200 cycles at-10℃,99%after 200 cycles at 25℃,and 83%after 100 cycles at 55℃,respectively,much superior to that of base electrolyte(63%/69%/45%).More surprisingly,galvanostatic c ha rge/discharge experiments at different temperatures reveal that NCM‖Li cells using FBP-Li_(2)TB additives can operate at temperatures ranging from-40℃to 60℃.This synergistic interphase modification utilizing dual electrolyte additives to construct a unique dual-layer CEI adaptive to a wide temperature range,provides valuable insights to the practical applications of NCM cathodes for all-climate batteries.
文摘Recently,the research team led by Prof.Chen Guang(陈光)at the Engineering Research Center of Materials Behavior and Design,Ministry of Education,Nanjing University of Science and Technology,successfully manufactured a new kind of high-temperature polysynthetic twinned(PST)TiAl single
文摘Applications like solid oxide fuel cells and sensors increasingly demand the possibility to braze ceramics to metals with a good resistance to high temperatures and oxidative atmospheres. Commonly used silver based active filler metals cannot fulfill these requirements, if application temperatures higher than 600℃ occur. Au and Pd based active fillers are too expensive for many fields of use. As one possible solution nickel based active fillers were developed. Due to the high brazing temperatures and the low ductility of nickel based filler metals, the modification of standard nickel based filler metals were necessary to meet the requirements of above mentioned applications. To reduce thermally induced stresses wide brazing gaps and the addition of A1203 and WC particles to the filler metal were applied. In this study, the microstructure of the brazed joints and the thermo-chemical reactions between filler metal, active elements and WC particles were analyzed to understand the mechanism of the so called wide gap active brazing process. With regard to the behavior in typical application oxidation and thermal cycle tests were conducted as well as tensile tests.
基金the support from the National Natural Science Foundation of China(No.52003038)China Postdoctoral Science Foundation funded project(No.2022M710600)+1 种基金the China National Postdoctoral Program for Innovative Talents(No.BX20220053)the Doctoral Project of Xichang University(No.YBZ202221)。
文摘Lithium-sulfur(Li-S)batteries have demonstrated the potential to conquer the energy storage related market due to the extremely high energy density.However,their performances at low temperature are still needed to be improved to broaden their applications.Therefore,in this review,the basic failure mechanisms and major challenges of Li-S battery at low temperature are categorized as the high desolvation barrier of Li^(+),uncontrolled nucleation and deposition of lithium,polysulfides clustering,and passivation of cathode by film like Li_(2)S.Targeting these major issues,strategies,and advances concerning the design of optimized electrolyte,composite cathode and functional separator are highlighted and discussed.Finally,the suggestions are proposed for the future development of practical Li-S battery working at low temperature scenarios,hoping to accelerate the commercialization process and bring revolution to the energy storage market.
基金supported by the National Key Research and Development Program of China(2024YFA1210400)the National Science Fund for Distinguished Young Scholars(52525101)+3 种基金the National Natural Science Foundation of China(52450001 and 22409014)the International Cooperation and Exchange of the National Natural Science Foundation of China(52411540237)the Tencent Xplorer Prize.Bingchao Qin acknowledges support from the China National Postdoctoral Program for Innovative Talents(BX20230456)China Postdoctoral Science Foundation(2024M754057).
文摘Thermoelectric conversion technology,capable of directly converting heat into electricity and vice versa,plays a crucial role in both energy supply and temperature control[1].This is particularly crucial in specialized fields,such as deep-space exploration where solar power is ineffective,as well as in miniaturized precision temperature control applications[2].
