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Articles 1 - 18 of 18
Full-Text Articles in Engineering
Synthesis And Electrochemical Performance Of Liv 3o 8/Polyaniline As Cathode Material For The Lithium Battery, Xuan-Wen Gao, Jia-Zhao Wang, Shulei Chou, Hua-Kun Liu
Synthesis And Electrochemical Performance Of Liv 3o 8/Polyaniline As Cathode Material For The Lithium Battery, Xuan-Wen Gao, Jia-Zhao Wang, Shulei Chou, Hua-Kun Liu
Shulei Chou
LiV3O8-polyaniline nanocomposites have been synthesized via chemical oxidative polymerization directed by the anionic surfactant sodium dodecyl benzene sulfate. The polyaniline particles are uniformly coated on the LiV3O8 nanorods. The composite with 12 wt.% polyaniline retains a discharge capacity of 204 mAh g-1 after 100 cycles and had better rate capability (175 mAh g-1 at 2 C and 145 mAh g-1 at 4 C) than the bare LiV3O8 electrode in the potential range of 1.5e4.0 V. The polyaniline coating can buffer the dissolution into the LiPF6 electrode that occurs in LiV3O8 during cycling. The charge transfer resistance of the composite electrode …
Nanocrystalline Porous A-Life02-C Composite-An Environmentally Friendly Cathode For The Lithium-Ion Battery, Md Mokhlesur Rahman, Jiazhao Wang, Mohd Faiz Hassan, Shulei Chou, Zhixin Chen, Hua Liu
Nanocrystalline Porous A-Life02-C Composite-An Environmentally Friendly Cathode For The Lithium-Ion Battery, Md Mokhlesur Rahman, Jiazhao Wang, Mohd Faiz Hassan, Shulei Chou, Zhixin Chen, Hua Liu
Shulei Chou
A novel nanocrystalline porous α-LiFeO2–C composite with a high surface area of around 115 m2 g−1 has been synthesized by a simple molten salt method, followed by a carbon coating process. The structure and morphology were confirmed by X-ray diffraction, field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). FE-SEM observations demonstrated that the morphology consists of α-LiFeO2–C nanoclusters composed of very tiny nanoparticles joined together by a porous architecture. TEM investigations revealed that amorphous carbon was incorporated into the pores among the nanoparticles and that some nanoparticles were covered by a thin layer of carbon as well. …
High Capacity, Safety, And Enhanced Cyclability Of Lithium Metal Battery Using A V2o5 Nanomaterial Cathode And Room Temperature Ionic Liquid Electrolyte, Shulei Chou, Jia-Zhao Wang, Jia-Zeng Sun, David Wexler, Maria Forsyth, Hua Liu, Douglas Macfarlane, S. Dou
High Capacity, Safety, And Enhanced Cyclability Of Lithium Metal Battery Using A V2o5 Nanomaterial Cathode And Room Temperature Ionic Liquid Electrolyte, Shulei Chou, Jia-Zhao Wang, Jia-Zeng Sun, David Wexler, Maria Forsyth, Hua Liu, Douglas Macfarlane, S. Dou
Shulei Chou
V2O5 nanomaterials including nanoribbons, nanowires, and microflakes have been synthesized by an ultrasonic assisted hydrothermal method and combined with a post-annealing process. The as-annealed V2O5 nanomaterials are characterised by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) N2 adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM). A room temperature ionic liquid (RTIL) has been used as an electrolyte ([C3mpyr][NTf2] containing 1 M LiNTf2) in rechargeable lithium metal batteries by combining V2O5 nanomaterials as cathode materials. The electrochemical tests including constant current charge-discharge, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) show near theoretical specific capacity, …
Nickel Sulfide Cathode In Combination With An Ionic Liquid-Based Electrolyte For Rechargeable Lithium Batteries, Jiazhao Wang, Shulei Chou, Sau Yen Chew, Jiazeng Sun, Maria Forsyth, Douglas Macfarlane, Hua Liu
Nickel Sulfide Cathode In Combination With An Ionic Liquid-Based Electrolyte For Rechargeable Lithium Batteries, Jiazhao Wang, Shulei Chou, Sau Yen Chew, Jiazeng Sun, Maria Forsyth, Douglas Macfarlane, Hua Liu
Shulei Chou
Nickel sulfides, pure Ni3S2 and a mixture of Ni7S6-NiS, were synthesized through a solvothermal process. The nickel sulphide powders were characterised by X-ray diffraction, scanning electron microscopy, and electrochemical testing. The results showed that the capacity of NiS-Ni7S6 is much higher than that of Ni3S2, when used as the cathode in a lithium cell with an organic solvent-based electrolyte, 1 M lithium bis (trifluoromethanesulfonyl)amide (LiNTf2) in poly(ethylene glycol) dimethyl either 500. The NiS-Ni7S6 electrodes were also tested with an ionic liquid electrolyte consisting of 1 M LiNTf2 in N-methyl-N-propyl pyrrolidinium bis(trifioromethanesulfonyl)amide ([C3mpyr][NTf2]) to compare with organic-solvent based electrolytes. The result …
Commissioning Of The Asta Laser Lab With Uv Pulse Length Characterization, Daniel Kelley, Jeff Corbett
Commissioning Of The Asta Laser Lab With Uv Pulse Length Characterization, Daniel Kelley, Jeff Corbett
STAR Program Research Presentations
The Linac Coherent Light Source (LCLS) at SLAC depends on a photocathode electron gun to provide the linear accelerator with the raw material – electrons – used for making X-ray laser pulses. The photocathode used in the LCLS Injector is a clean copper plate in high vacuum. When the cathode is struck with high energy UV light, electrons are liberated from its surface and then accelerated down the linac with radio-frequency electric fields. These fast-moving bunches of electrons are directed through an undulator magnet to radiate X-ray light.
Although scientists have been using photocathode techniques at SLAC for 25 years, …
An Overview Of Electrode Materials In Microbial Fuel Cells, Su-Qin Ci, Na Wu, Zhen-Hai Wen, Jing-Hong Li
An Overview Of Electrode Materials In Microbial Fuel Cells, Su-Qin Ci, Na Wu, Zhen-Hai Wen, Jing-Hong Li
Journal of Electrochemistry
Microbial fuel cells (MFCs) are devices that can directly convert organic chemical energy into electrical energy with microbial as catalysts. MFCs are a promising bio-electrochemical system with the potential to degrade organic sewage and produce electricity. This article supplies a critical and comprehensive review for the electrode materials concerning about anode and cathode in MFCs, including the fabrications, functional modifications and surface constructions of electrode materials, as well as their applications in MFCs. Additionally, the existing problems of electrode materials in current MFCs have been demonstrated in order to provide the guideline for exploring the next-generation electrode materials for MFCs.
Implementation Of A ¼ Inch Hollow Cathode Into A Miniature Xenon Ion Thruster (Mixi), David Wayne Knapp
Implementation Of A ¼ Inch Hollow Cathode Into A Miniature Xenon Ion Thruster (Mixi), David Wayne Knapp
Master's Theses
Over the last decade, miniature ion thruster development has remained an active area of research do to its low power, low thrust, and high efficiency, however, due to several technical issues; a flight level miniature ion thruster has proved elusive. This thesis covers the design, fabrication, assembly, and test of an altered version of the Miniature Xenon Ion thruster (MiXI), originally developed by lead engineer Dr. Richard Wirz, at the California Institute of Technology (Caltech). In collaboration with Dr. Wirz, MiXI-CP-V3 was developed at Cal Poly San Luis Obispo with the goal of implementing of a ¼ inch hollow cathode …
Synthesis And Electrochemical Properties Of Lifeso4f/Graphene Composite As Cathode Material For Lithium-Ion Batteries, Wei Guo, Ya-Xia Yin, Li-Jun Wan, Yu-Guo Guo
Synthesis And Electrochemical Properties Of Lifeso4f/Graphene Composite As Cathode Material For Lithium-Ion Batteries, Wei Guo, Ya-Xia Yin, Li-Jun Wan, Yu-Guo Guo
Journal of Electrochemistry
The LiFeSO4F was successfully synthesized from the reactions of FeSO4?xH2O (x=1, 4, 7) with LiF in tetraethylene glycol media through a facile low temperature method. The structures and microscopic features of the products were characterized by XRD, SEM and TEM. TGA result shows the good thermal stability of the as-prepared LiFeSO4F. No diffraction peaks of the FeSO4 are observed in the as-prepared products with the starting material of either FeSO4?4H2O or FeSO4?7H2O, which should be ascribed to delaying the release of H2O from the hydrated compounds. Cyclic voltammetry (CV) curves and electrochemical impedance spectroscopy (EIS) results prove that the LiFeSO4F/graphene …
Preparation And Hydrogen Evolution Properties Of Ni/Ag2o/Ruo2-Pt Cathodes, Shu Huang, Xue-Ming Li, Wu-Lin Li, Wen Wang
Preparation And Hydrogen Evolution Properties Of Ni/Ag2o/Ruo2-Pt Cathodes, Shu Huang, Xue-Ming Li, Wu-Lin Li, Wen Wang
Journal of Electrochemistry
The Ni/Ag2O/RuO2-Pt composite cathode was prepared by sol-gel method using RuCl3 and H2PtCl6 as raw materials. The effects of heat treatment conditions and AgNO3 concentrations on hydrogen evolution properties were investigated. The morphology and composition of Ni/Ag2O/RuO2-Pt composite cathode have been characterized by XRD, XPS and SEM-EDS. It is demonstrated that the surface structure of Ni/Ag2O/RuO2-Pt composite cathode is more compact, with fewer cracks and larger surface roughness than pure nickel. At the conditions of 0.3 A?cm-2, 90 oC, and 11 mol?L-1 NaOH solution, the hydrogen evolution overpotential of Ni/Ag2O/RuO2-Pt composite cathode increases 484 mV with respect to pure nickel …
A Battery Composed Of A Polypyrrole Cathode And A Magnesium Alloy Anode-Toward A Bioelectric Battery, Yong Kong, Caiyun Wang, Yang Yang, Chee O. Too, Gordon G. Wallace
A Battery Composed Of A Polypyrrole Cathode And A Magnesium Alloy Anode-Toward A Bioelectric Battery, Yong Kong, Caiyun Wang, Yang Yang, Chee O. Too, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
A bioelectric battery can be implanted into the human body and relies on oxygen in the internal body fluid to produce electrical energy. In this work, a battery that uses polypyrrole doped with a biological polyelectrolyte (dextran sulfate, an anti-coagulant) as the cathode and bioresorbable Mg alloy (AZ61) as the anode was developed. This battery exhibited a discharge capacity of 565 mA h g-1 in phosphate buffered saline (PBS, pH = 7.4), a commonly used electrolyte in biological research; offering a specific energy density of similar to 790W h kg-1. The electrochemical properties of the cathode, anode …
Electrochemical Characteristics Of Layered Li1.95mn0.9co0.15o3 (C2/M) As A Lithium-Battery Cathode, Kiyoshi Ozawa, Yasuhiro Nakao, Takashi Mochiku, Zhenxiang Cheng, Lianzhou Wang, Hideo Iwai, Yoshinori Tsuchiya, Hiroki Fujii, Naoki Igawa
Electrochemical Characteristics Of Layered Li1.95mn0.9co0.15o3 (C2/M) As A Lithium-Battery Cathode, Kiyoshi Ozawa, Yasuhiro Nakao, Takashi Mochiku, Zhenxiang Cheng, Lianzhou Wang, Hideo Iwai, Yoshinori Tsuchiya, Hiroki Fujii, Naoki Igawa
Faculty of Engineering - Papers (Archive)
A manganese-based solid solution with the composition of Li(1.95)Mn(0.9)Co(0.15)O(3) was synthesized by a simplified coprecipitation method, followed by a combustion technique, and its electrochemical characteristics as a lithium-battery cathode were investigated. Rietveld refinement based on neutron diffraction data revealed that the material is assigned to an Li(2)MnO(3)-type structure model with a monoclinic cell due to the space group symmetry of C2/m. In cycling of the Li/Li(+)/Li(1.95)Mn(0.9)Co(0.15)O(3) cell in the potential range of 2.0-4.8 V at current densities of 30 mAg(-1), the discharge capacity characteristically increases from 46.3 to 196.5mAhg(-1) as the cycle increases from 1 to 11, and a discharge …
Facile Synthesis Of A Interleaved Expanded Graphite-Embedded Sulphur Nanocomposite As Cathode Of Li-S Batteries With Excellent Lithium Storage Performance, Yun-Xiao Wang, Ling Huang, Li-Chao Sun, Su-Yuan Xie, Gui-Liang Xu, Shu-Ru Chen, Yue-Feng Xu, Jun-Tiao Li, Shulei Chou, S. X. Dou, Shi-Gang Sun
Facile Synthesis Of A Interleaved Expanded Graphite-Embedded Sulphur Nanocomposite As Cathode Of Li-S Batteries With Excellent Lithium Storage Performance, Yun-Xiao Wang, Ling Huang, Li-Chao Sun, Su-Yuan Xie, Gui-Liang Xu, Shu-Ru Chen, Yue-Feng Xu, Jun-Tiao Li, Shulei Chou, S. X. Dou, Shi-Gang Sun
Faculty of Engineering - Papers (Archive)
This paper reports the facile synthesis of a unique interleaved expanded graphite-embedded sulphur nanocomposite (S-EG) by melt-diffusion strategy. The SEM images of the S-EG materials indicate the nanocomposites consist of nanosheets with a layer-by-layer structure. Electrochemical tests reveal that the nanocomposite with a sulphur content of 60% (0.6S-EG) can deliver the highest discharge capacity of 1210.4 mAh g−1 at a charge–discharge rate of 280 mA g−1 in the first cycle, the discharge capacity of the 0.6S-EG remains as high as 957.9 mAh g−1 after 50 cycles of charge–discharge. Furthermore, at a much higher charge–discharge rate of 28 A g−1, the …
Microwave-Assisted Synthesis Of Flower-Like Structure Ε-Mno2 As Cathode For Lithium Ion Batteries, Dan Li, Guodong Du, Jieqiang Wang, Zaiping Guo, Zhixin Chen, Hua-Kun Liu
Microwave-Assisted Synthesis Of Flower-Like Structure Ε-Mno2 As Cathode For Lithium Ion Batteries, Dan Li, Guodong Du, Jieqiang Wang, Zaiping Guo, Zhixin Chen, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
Nanostructured flower-like ϵ-MnO2 and α-MnO2 nanowires were prepared by the microwave-assisted hydrothermal method at 110 °C and 140 °C. The ϵ-nanoflowers are about 500 nm in size and are composed of petals about 100 nm in length, while the α-nanowires are 20-30 μm in diameter and about 1 mm in length. The ϵ-MnO2 demonstrates higher initial discharge capacity, while the α-MnO2 shows greater cycling stability in different voltage ranges. Both phases of MnO2 show better cycling performance in ethylene carbonate (EC)/diethyl carbonate electrolyte (DEC) than in EC/dimethyl carbonate (DMC) electrolyte. The ϵ-MnO2 sample delivered …
Synthesis And Electrochemical Performance Of Liv 3o 8/Polyaniline As Cathode Material For The Lithium Battery, Xuan-Wen Gao, Jia-Zhao Wang, Shulei Chou, Hua-Kun Liu
Synthesis And Electrochemical Performance Of Liv 3o 8/Polyaniline As Cathode Material For The Lithium Battery, Xuan-Wen Gao, Jia-Zhao Wang, Shulei Chou, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
LiV3O8-polyaniline nanocomposites have been synthesized via chemical oxidative polymerization directed by the anionic surfactant sodium dodecyl benzene sulfate. The polyaniline particles are uniformly coated on the LiV3O8 nanorods. The composite with 12 wt.% polyaniline retains a discharge capacity of 204 mAh g-1 after 100 cycles and had better rate capability (175 mAh g-1 at 2 C and 145 mAh g-1 at 4 C) than the bare LiV3O8 electrode in the potential range of 1.5e4.0 V. The polyaniline coating can buffer the dissolution into the LiPF6 electrode that occurs in LiV3O8 during cycling. The charge transfer resistance of the composite electrode …
Graphene Wrapped Lifepo4/C Composites As Cathode Materials For Li-Ion Batteries With Enhanced Rate Capability, Yi Shi, Shulei Chou, Jia-Zhao Wang, David Wexler, Hui-Jun Li, Hua-Kun Liu, Yuping Wu
Graphene Wrapped Lifepo4/C Composites As Cathode Materials For Li-Ion Batteries With Enhanced Rate Capability, Yi Shi, Shulei Chou, Jia-Zhao Wang, David Wexler, Hui-Jun Li, Hua-Kun Liu, Yuping Wu
Faculty of Engineering - Papers (Archive)
To reduce the reaction time, electrical energy consumption, and cost, LiFePO4/C/graphene has been synthesized by a rapid, one-pot, microwave-assisted hydrothermal method within 15 min at a temperature of 200 °C, followed by sintering at 600 °C for 2 h under a H2/Ar (5:95, v/v) atmosphere. The microstructure and morphology of the LiFePO4/C/graphene products were characterized by means of X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy. The carbon coated LiFePO4/C nanoparticles, around 200 nm in size, are thoroughly wrapped by crumpled micrometer-size graphene sheets. In this kind …
K0.25mn2o4 Nanofiber Microclusters As High Power Cathode Materials For Rechargeable Lithium Batteries, Chaofeng Zhang, Chuanqi Feng, Peng Zhang, Zaiping Guo, Zhixin Chen, Sean Li, Hua-Kun Liu
K0.25mn2o4 Nanofiber Microclusters As High Power Cathode Materials For Rechargeable Lithium Batteries, Chaofeng Zhang, Chuanqi Feng, Peng Zhang, Zaiping Guo, Zhixin Chen, Sean Li, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
K0.25Mn2O4 microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K0.25Mn2O4 nanofiber microclusters synthesized at 120 degrees C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g-1 at current density of 100 mA g-1) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the …
Lifepo4-Fe2p-C Composite Cathode: An Environmentally Friendly Promising Electrode Material For Lithium-Ion Battery, M. Mahfuzur Rahman, Jiazhao Wang, Rong Zeng, David Wexler, Hua-Kun Liu
Lifepo4-Fe2p-C Composite Cathode: An Environmentally Friendly Promising Electrode Material For Lithium-Ion Battery, M. Mahfuzur Rahman, Jiazhao Wang, Rong Zeng, David Wexler, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
In this investigation, the synthesis strategy is involved the creation of LiFePO4-Fe2P-C composites with a porous conductive architecture, which includes distinct regions or clusters containing antiferromagnetic LiFePO4 in close proximity to ferromagnetic Fe2P. The microstructure is achieved by using a simple ultra-fast solvent assisted manual grinding method, combined with solid state reaction, which can replace the time-consuming high energy ball milling method. The crystalline structure, morphology, and electrochemical characterization of the synthesised product are investigated systematically. The electrochemical performance is outstanding, especially the high C rate. The composite cathode is found to display specific capacity of 167 mAh g-1 at …
Key Factors Influencing The Structure And Electrochemical Performances Of Lifepo4 Via Sol-Gel Synthesis, Chuang Guan
Key Factors Influencing The Structure And Electrochemical Performances Of Lifepo4 Via Sol-Gel Synthesis, Chuang Guan
Browse all Theses and Dissertations
Olivine structured LiFePO4 is a promising cathode material for the next generation of lithium ion batteries for its low cost, environmental benign, good cycling performance and safety, etc. However, its intrinsic poor electrical conductivity and diffusion capability of lithium ion greatly hinder its application in the high power recharge battery. In this research, a cost-effective sol-gel method was used to synthesize carbon coated LiFePO4 (LiFePO4/C) materials. The influences of the synthesis parameters, including the species of iron source, lithium content, chelating agents and carbon sources, PH value of the sol, and sintering conditions etc., on the structure and electrochemical properties …