Magnesiothermic Reduction Improved Route to High-yield Synthesis of Interconnected Porous Si@C Networks Anode of Lithium Ions Batteries

2021 ◽  
Author(s):  
Qian Liu ◽  
Yaxin Ji ◽  
Ximeng Yin ◽  
Junwei Li ◽  
Yangjie Liu ◽  
...  
Keyword(s):  
High Yield ◽  
Magnesiothermic Reduction ◽  
Porous Si ◽  
Lithium Ions

High performance of porous silicon/carbon/RGO network derived from rice husks as anodes for lithium-ion batteries

2018 ◽  
Vol 42 (24) ◽  
pp. 19811-19817 ◽  
Author(s):  
Kaifeng Yu ◽  
Hanxiang Zhang ◽  
Hui Qi ◽  
Jicai Liang ◽  
Ce Liang
Keyword(s):  
Porous Silicon ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Reduction Reaction ◽  
Magnesiothermic Reduction ◽  
Rice Husks ◽  
Porous Si ◽  
Silicon Carbon ◽  
Battery Anode

Rice husk-derived porous Si/C synthesized via activation and magnesiothermic reduction reaction possesses excellent electrochemistry performance as a lithium-ion battery anode.

Effective strategies for improving the electrochemical properties of highly porous Si foam anodes in lithium-ion batteries

2014 ◽  
Vol 2 (34) ◽  
pp. 14195-14200 ◽  
Author(s):  
Taesoo Bok ◽  
Sinho Choi ◽  
Jeongchan Lee ◽  
Soojin Park
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Magnesiothermic Reduction ◽  
Porous Si ◽  
Electrically Conductive ◽  
Effective Strategies ◽  
Highly Porous

We synthesize Si foam particles via magnesiothermic reduction of silica foam. Three effective strategies, like control of the calcination conditions of silica foam, introduction of a heat scavenger and doping of electrically conductive layers, lead to significant improvement of the electrochemical properties of the Si foam anodes.

Mechanistic insight into high yield electrochemical nitrogen reduction to ammonia using lithium ions

2019 ◽  
Vol 21 ◽  
pp. 100700 ◽  
Author(s):  
Anku Guha ◽  
Sreekanth Narayanaru ◽  
Nisheal M. Kaley ◽  
D. Krishna Rao ◽  
Jagannath Mondal ◽  
...  
Keyword(s):  
High Yield ◽  
Lithium Ions ◽  
Nitrogen Reduction ◽  
Mechanistic Insight ◽  
Insight Into

Quality films from carbon fiber evaporation for thorough coverage of TEM grids

1988 ◽  
Vol 46 ◽  
pp. 418-419
Author(s):  
N. Tempel ◽  
M. C. Ledbetter
Keyword(s):  
Electron Microscopy ◽  
High Resolution Electron Microscopy ◽  
Carbon Films ◽  
Low Noise ◽  
Vacuum Evaporation ◽  
High Yield ◽  
Good Adhesion ◽  
Noise Structure ◽  
Resolution Electron ◽  
Carbon Foils

Carbon films have been a support of choice for high resolution electron microscopy since the introduction of vacuum evaporation of carbon. The desirable qualities of carbon films and methods of producing them has been extensively reviewed. It is difficult to get a high yield of grids by many of these methods, especially if virtually all of the windows must be covered with a tightly bonded, quality film of predictable thickness. We report here a method for producing carbon foils designed to maximize these attributes: 1) coverage of virtually all grid windows, 2) freedom from holes, wrinkles or folds, 3) good adhesion between film and grid, 4) uniformity of film and low noise structure, 5) predictability of film thickness, and 6) reproducibility.Our method utilizes vacuum evaporation of carbon from a fiber onto celloidin film and grid bars, adhesion of the film complex to the grid by carbon-carbon contact, and removal of the celloidin by acetone dissolution. Materials must be of high purity, and cleanliness must be rigorously maintained.

TEM characterization of proton-exchanged LiNbO3 optical waveguides

1986 ◽  
Vol 44 ◽  
pp. 480-481
Author(s):  
W. E. Lee
Keyword(s):  
Refractive Index ◽  
Benzoic Acid ◽  
Optical Waveguides ◽  
Total Internal Reflection ◽  
Index Of Refraction ◽  
Optical Measurements ◽  
Lithium Ions ◽  
Wide Channel ◽  
Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

1990 ◽  
Vol 48 (4) ◽  
pp. 876-877
Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee
Keyword(s):  
High Pressure ◽  
Carbon Fiber ◽  
Sample Surface ◽  
High Yield ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Peek Composite ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

Catalytic enantioselective synthesis of indolizino[8,7-b]indole alkaloid derivatives based on the tandem reaction of tertiary enamides

2021 ◽  
Author(s):  
Xin-Ming Xu ◽  
Ming Xie ◽  
Jiazhu Li ◽  
Mei-Xiang Wang
Keyword(s):  
Indole Alkaloid ◽  
Enantioselective Synthesis ◽  
High Yield ◽  
Tandem Reaction ◽  
Indole Derivatives

An exquisite Pybox/Cu(OTf)2-catalyzed asymmetric tandem reaction of tertiary enamides was developed, which enabled the expeditious synthesis of indolizino[8,7-b]indole derivatives in high yield, excellent enantioselectivity and diastereoselectivity.

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