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Full-Text Articles in Physical Sciences and Mathematics
Poly(Ethylene Oxide) Based Polymer Electrolytes For All-Solid-State Li-S Batteries, Xue Li, Zheng-Liang Gong
Poly(Ethylene Oxide) Based Polymer Electrolytes For All-Solid-State Li-S Batteries, Xue Li, Zheng-Liang Gong
Journal of Electrochemistry
In recent years, research on lithium-sulfur (Li-S) batteries has received much attention because the sulfur positive electrode and the lithium metal negative electrode produce a high theoretical specific capacity (lithium metal ~ 3800 mAh·g-1, sulfur ~ 1675 mAh·g-1). In addition, sulfur is considered to be the most promising cathode material for secondary lithium batteries, due to its advantages of low price and environmental friendly. However, the practical application of conventional liquid Li-S batteries is still obstructed by several critical issues, such as lithium ploysulfides shuttle effect, long-term stability of lithium metal anode with organic liquid electrolytes, and the safety concerns …
Development Of Novel Anode Materials For Lithium Ion Batteries, Mike A. Nieradko
Development Of Novel Anode Materials For Lithium Ion Batteries, Mike A. Nieradko
Electronic Thesis and Dissertation Repository
This thesis focuses on the development of new anodes for Li ion batteries. Aluminium has been long considered as promising anode material for Li ion batteries because of its low cost, abundance, and low toxicity. Aluminium undergoes alloying with lithium through intermetallic LiAl formation which offers a relatively high theoretical capacity of 993 mAh/g compared to 372 mAh/g for graphite that is currently the principal anode material in commercial Li ion batteries. However, despite intensive research, all aluminium-based anodes tested so far suffered from rapid capacity fading and failure within first few cycles. Furthermore, there is insufficient understanding of the …
Development And Optimization Of Solid Polymer Electrolyte For Lithium Ion Batteries, Ladan Eskandarian
Development And Optimization Of Solid Polymer Electrolyte For Lithium Ion Batteries, Ladan Eskandarian
Electronic Thesis and Dissertation Repository
This thesis focuses on the development of new poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) in order to enhance their ionic conductivity at ambient temperature and fabricate the prototypes of novel Li ion batteries using these SPEs. Different types of SPEs have been developed: (i) blends of high molecular weight PEO and low molecular weight poly(vinyl acetate) (PVAc); (ii) composites of high molecular weight PEO and titanium dioxide (TiO2)nanoparticles; and (iii) blend-based composite electrolytes consisting of PEO and PVAc with dispersed TiO2. The SPEs were characterized by scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), and …
Investigation Of Pulse Potential-Modulated Coulometry For Co_2 Detection, Hai-Chuan Wang, Bing-Liang Wu
Investigation Of Pulse Potential-Modulated Coulometry For Co_2 Detection, Hai-Chuan Wang, Bing-Liang Wu
Journal of Electrochemistry
A pulse potential-modulated technique was applied to measure the concentration of CO_2 in gas samples. In the first step, an anodic pulse and a consequent cathodic pulse were used to remove the organic pollutant and surface oxide on the surface of the platinized Pt gauze electrode before each experiment. As following, a given potential step was used to reduce the CO_2 into adsorbed intermediate on Pt surface, and the adsorbates produced were oxidized by a following anodic potential step. At same time the oxidation current of adsorbates were measured. A certain relation exists between the concentration of CO_2 and the …
The Dissolution Of Perfluorinated Proton Exchange Membrane And The Analysis On The Performance Of The Recast Membrane, Hong-Feng Xu, Xi-Qiang Yan, Xuan Li, Li Wan
The Dissolution Of Perfluorinated Proton Exchange Membrane And The Analysis On The Performance Of The Recast Membrane, Hong-Feng Xu, Xi-Qiang Yan, Xuan Li, Li Wan
Journal of Electrochemistry
Perfluorinated resin solution is useful in proton exchange membrane fuel cell. At 270～280 ℃ and protected with N 2, the proton exchange membrane(Nafion 115) was dissolved in the dimethyl sulfoxide, and two kinds of membrane solutions were obtained. With those solutions, a recast membrane was prepared. The exchange capacity, rate of water content and conductivity of the recast membrane were measured. The results show that the properties of the recast membrane are lower than those of its mother membrane. This may be caused by that some sulfonic acid groups were destroyed in the dissolving process.
A New Cell Structure For Proton Exchange Membrane Fuel Cell, Ming Han, Hongfeng Xu, Baolian Yi
A New Cell Structure For Proton Exchange Membrane Fuel Cell, Ming Han, Hongfeng Xu, Baolian Yi
Journal of Electrochemistry
Separating the functions of current collection and gas flow distribution and then to design two separate elements to achieve the desired performance characteristics,a nonconventional cell structure for proton exchange membrane fuel cells bave been developed.The current collector is achieved using a thin stain steel sheet,the gas flow distribution is achieved using a carbon paper that has the desired chemical durabiliy when in contact with the proton exchange membrane. Combining these two separate elements into a single divice yields a bifunctional device that performs as a bipolar separator plate. The advantages of this alternative appproach to making biplar plates are that …
Study On The Ionic Conductivity Of Comb Polymer Electrolytes, Liming Ding
Study On The Ionic Conductivity Of Comb Polymer Electrolytes, Liming Ding
Journal of Electrochemistry
A comb polymer(CP350)with oligo-oxyethylene side chains was prepared from methyl vinyl ether/maleic anhydride copolymer.The ionic conductivity of CP350/LiAsF6 and CP350/LiPF6 complexes was studied as a function of temperature and[Li]/[EO]ratios.A equivalent circuit was given to interpret complex impedance spectra. At 25℃,the ionic conductivity maxima of the two systems are 1.38×10(-4),8.32×10(-5)S/cm respectively. The appearance of the conductivity maxima has been interpreted as being due to the effect of microviscosity on ion transport. lonic conduction displays non-Arrhenius behaviour.The temperature dependence of ionic conductivity was attributed mainly to the temperature dependence of charge carrier hopping,ion pairing and micro Brown motion of side chains.The larger …
A Study On Solid Polymer Electrolyte Fuel Cell, Hongfeng Xu, Ming Han, Baolian Yi, Xinge Zhang, Shanhai Ge
A Study On Solid Polymer Electrolyte Fuel Cell, Hongfeng Xu, Ming Han, Baolian Yi, Xinge Zhang, Shanhai Ge
Journal of Electrochemistry
Solid polymer electrolyte fuel cell(SPEFC)show promise of a high level of performance in the present fuel cell.In this paper,we report the method of SPEFC electrode preparation,and the effects of temperature,pressure and gas flow rate on the performance.