Designing a Multifunctional Separator for High‐Performance Li–S Batteries at Elevated Temperature

Small ◽  
2019 ◽  
Vol 15 (47) ◽  
pp. 1904332 ◽  
Author(s):  
Yibo He ◽  
Shichao Wu ◽  
Qi Li ◽  
Haoshen Zhou
Keyword(s):  
Elevated Temperature ◽  
High Performance

Developing high performance mechanical properties at elevated temperature in squeeze cast Al-Cu-Mn-Fe-Ni alloys

2019 ◽  
Vol 150 ◽  
pp. 128-137 ◽  
Author(s):  
Bo Lin ◽  
Wenxin Zhang ◽  
Xiaoping Zheng ◽  
Yuliang Zhao ◽  
Zhaohui Lou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
High Performance ◽  
Ni Alloys ◽  
Squeeze Cast

scholarly journals Single step assembly of biomolecule-loaded sub-micron polysulfone fibers

2016 ◽  
Vol 87 (3) ◽  
pp. 340-350 ◽  
Author(s):  
B Ghorani ◽  
S J Russell ◽  
A J Hebden ◽  
P Goswami
Keyword(s):  
Elevated Temperature ◽  
Binary System ◽  
High Performance ◽  
Amorphous Polymer ◽  
Single Step ◽  
Solubility Parameters ◽  
Binary Solvent ◽  
Hansen Solubility Parameters ◽  
Fiber Morphology ◽  
Excellent Thermal Stability

Enrichment of chemically resistant hydrophobic polymers with polar biomolecules is relevant to the production of fiber-based drug delivery devices and adsorptive filtration media, as well as fibers for selective molecular recognition of antibodies, enzymes and nucleic acids. Polysulfone (PSU) is an amorphous polymer possessing high-strength, rigidity and excellent thermal stability. The preparation of PSU spinning solutions requires lengthy dissolution times at elevated temperature that tends to degrade commixed polar biomolecules. Using the highly polar metabolite creatinine, as a model system, a variety of co-solvents was evaluated for electrospinning commixed solutions of PSU and creatinine at room temperature. The selection of solvent systems was informed by Hansen solubility parameters. A binary system of N, N-dimethylacetamide (DMAc):methanol (4:1) was not found to be a suitable solvent because of the need for elevated temperature (80℃) to facilitate dissolution, and a binary solvent system of N, N-dimethylformamide (DMF):dimethyl sulfoxide (DMSO) (3:2) resulted in nozzle blockage during spinning. A binary system of DMAc:DMSO (13:7) enabled preparation of PSU with creatinine at ambient temperature, and sub-micron fibers substantially free of beads were produced continuously via electrospinning, yielding fiber diameters in the range 470–870 nm. The presence of creatinine was confirmed by high performance liquid chromatography (HPLC), and fiber morphology was examined by scanning electron microscopy (SEM).

High Performance CuMetallized GaAs HEMTs Processing and Reliability

1998 ◽  
Vol 535 ◽  
Author(s):  
T. Feng ◽  
A. Dimoulas ◽  
N. Strifas ◽  
A. Christou
Keyword(s):  
Elevated Temperature ◽  
Electron Mobility ◽  
High Performance ◽  
High Electron Mobility Transistors ◽  
High Electron ◽  
High Electron Mobility ◽  
Electron Mobility Transistors ◽  
Comparable Performance ◽  
Gate Resistance

AbstractAlGaAs/GaAs based high electron mobility transistors (HEMTs) with Cu/Ti metallized gates have been fabricated. Copper gates were used to achieve low gate resistance and to minimize the hydrogen induced device degradation. The DC measurement of the processed AlGaAs/GaAs HEMTs with Cu/Ti gates shows comparable performance to similar Au based GaAs HEMTs. The Cu-based HEMTs were also subjected to elevated temperature testing under 5% H2 –N2 forming gas up to 250°C and 8 hours and no degradation due to hydrogen effects was found.

Elevated temperature resistance of ultra-high-performance fibre-reinforced cementitious composites

2015 ◽  
Vol 67 (17) ◽  
pp. 923-937 ◽  
Author(s):  
Anwar Q. Sobia ◽  
Mohd S. Hamidah ◽  
Ibrahim Azmi ◽  
Sahibzada F. A. Rafeeqi
Keyword(s):  
Elevated Temperature ◽  
High Performance ◽  
Cementitious Composites ◽  
Temperature Resistance ◽  
High Performance Fibre

scholarly journals Construction of Electrocatalytic and Heat-Resistant Self-Supporting Electrodes for High-Performance Lithium–Sulfur Batteries

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Xuemei Zhang ◽  
Yunhong Wei ◽  
Boya Wang ◽  
Mei Wang ◽  
Yun Zhang ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
High Performance ◽  
Structural Engineering ◽  
Utilization Efficiency ◽  
High Rate ◽  
Shuttle Effect ◽  
Electrocatalytic Effect ◽  
Lithium Sulfur Batteries ◽  
Engineering Strategy ◽  
Lithium Sulfur

Abstract Boosting the utilization efficiency of sulfur electrodes and suppressing the “shuttle effect” of intermediate polysulfides remain the critical challenge for high-performance lithium–sulfur batteries (LSBs). However, most of reported sulfur electrodes are not competent to realize the fast conversion of polysulfides into insoluble lithium sulfides when applied with high sulfur loading, as well as to mitigate the more serious shuttle effect of polysulfides, especially when worked at an elevated temperature. Herein, we reported a unique structural engineering strategy of crafting a unique hierarchical multifunctional electrode architecture constructed by rooting MOF-derived CoS2/carbon nanoleaf arrays (CoS2–CNA) into a nitrogen-rich 3D conductive scaffold (CTNF@CoS2–CNA) for LSBs. An accelerated electrocatalytic effect and improved polysulfide redox kinetics arising from CoS2–CNA were investigated. Besides, the strong capillarity effect and chemisorption of CTNF@CoS2–CNA to polysulfides enable high loading and efficient utilization of sulfur, thus leading to high-performance LIBs performed not only at room temperature but also up to an elevated temperature (55 °C). Even with the ultrahigh sulfur loading of 7.19 mg cm−2, the CTNF@CoS2–CNA/S cathode still exhibits high rate capacity at 55 °C.

Precipitates in hot pressed Nd-Fe-B magnets

1989 ◽  
Vol 47 ◽  
pp. 572-573
Author(s):  
Tsung-Yao Chu
Keyword(s):  
Elevated Temperature ◽  
High Performance ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
Ion Beam ◽  
Boundary Phase ◽  
Full Density ◽  
Mechanical Grinding ◽  
Thin Sections ◽  
Argon Ion

High-performance permanent magnets based on the Nd-Fe-B ternary system can be prepared by melt-spinning of the molten alloy and subsequent pressing to full density at elevated temperature. The starting composition is always slightly rich in Nd compared to stoichiometric Nd2Fe14B in order to ensure the formation of the Nd-rich grain boundary phase. The excess Nd additions also serve to keep elemental Fe particles from precipitating but, instead, lead to unexpected precipitation within the Nd2Fe14B grains. The current research seeks to fully characterize the structure of the precipitates.Electron transparent specimens for TEM examination were prepared by mechanical grinding of thin sections cut from the hot pressed Nd0.135Fe0.815B0.05 magnets, followed by argon ion beam milling at 6 kV. Most of the samples were studied in a JEOL 1200EX STEM equipped with EDS, operating at 120 kV. A few samples were examined at higher resolution in a JEOL 200 CX TEM operated at 200 kV, employing a side entry goniometer stage and a LaB6 cathode.

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