Secondary Batteries
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Eletrossíntese, caracterização e testes de compósitos de polipirrol e poli(DMcT) sobre fibra de carbono como catodos de baterias secundárias e eletrodos de supercapacitores / Electrosynthesis, characterization and tests of polypyrrole and poly(DMcT) composites on carbon fiber as cathodes of secondary batteries and supercapacitor electrodes
In this work bilayered electrodes made of polypyrrole Ppy and poly(2,5-dimercapto-1,3,4-tiadiazol) poly(DMcT) were produced and characterized on carbon-fiber substrate. To do so, several aspects were investigated: effect of the charge growth (1, 2, 5 and 10 C) on the electrochemical and morphological properties of Ppy electrodeposited on carbon fiber; defini
Publicado em: 2009
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2. INTEGRAÇÃO DE PILHAS DE CÉLULAS A COMBUSTÍVEL COM OUTRAS FONTES ALTERNATIVAS DE ENERGIA / INTEGRATION OF FUEL CELLS STACKS WITH OTHER ALTERNATIVE SOURCES OF ENERGY
This dissertation presents a project of a integrated system with distinct energy generating modules using a wind generator, photovoltaic generator, fuel cells stack (FCs) and an accumulator of energy formed by a bank of batteries. This system was implemented in the Center of Studies in Energy and Environment-CEEMA-UFSM. The alternative sources of energy were
Publicado em: 2009
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3. Polypyrrole and Li1.05Mn2O4 composites: preparation by dip coating or casting and electrochemical caracterization / Compósitos de Polipirrol e Li1,05Mn2O4 : preparação por dip coating ou casting e caracterização eletroquímica
Films of polypyrrole/Li1.05Mn2O4 composites were prepared by chemical synthesis over a carbon-fiber substrate, using the dipcoating and casting techniques, aiming at improving the performance of these materials as cathodes in secondary lithium or lithium-ion batteries. For this the following were investigated: i) electrochemical behavior of both materials (p
Publicado em: 2009
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4. Filmes automontados de óxidos metálicos: eletrocromismo e armazenamento de energia / Self-Assembled films composed of transition metal oxides for electrochromism and charge storage
Thin films of titanium dioxide (TiO2), poly(vinyl sulfonic acid) (PVS) and tungsten oxo-hydroxy (WOxHy) were prepared using the Layer-by-Layer (LbL) method, allowing for strict control of its thickness and nanoarchitecture. The properties of these films concerning lithium ion transport and storage were investigated, so that these materials can be applied in
Publicado em: 2009
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5. Preparation and characterization of conducting polymer electrodes on reticulated vitreous carbon (RVC) for application in secondary batteries. / Preparação e caracterização de eletrodos de polímeros condutores sobre carbono vítreo reticulado (RVC) para a aplicação em baterias secundárias.
The general purpose of this work is the optimization of the conducting polymer deposition on RVC and the use of these electrodes in an allpolymeric ion-lithium battery, which means an anode and a cathode made of conducting polymers. Several steps were done in order to attain this purpose: i) a previous study on the effect of different pre-treatments on the R
Publicado em: 2006
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6. PROJETO E IMPLEMENTAÇÃO DE UM CONTROLE MODULAR HCC PARA INTEGRAÇÃO DE FONTES ALTERNATIVAS DE ENERGIA / DESIGN AND IMPLEMENTATION OF A MODULAR HCC CONTROLLER TO INTEGRATE ALTERNATIVE SOURCES OF ENERGY
The experience of electric energy shortage in 2001 demonstrated that our dependence almost exclusively on hydroelectricity could fetch great problems to Brazil. Thus being, the existence of trustworthy alternatives of energy must exist, at the very least, as a reserve. For this reason, the perspective of decentralizing the energy production as a form of prom
Publicado em: 2006
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7. Electrochemical and structural study of the electrode of hydroxide of nickel modified with cerium for stabilization of the phase 945;-Ni(OH)2 / Estudo eletroquímico e estrutural do eletrodo de hidróxido de níquel modificado com cério para estabilização da fase α-Ni(OH0)2
Ni(OH)2 is widely used as main active component for positive electrodes for secondary batteries such as Ni/Cd, Ni/Zn, Ni/Fe, Ni/H2 and recently in cell of Ni/MH. These accumulators show certain characteristics and they have several applications, such as: geostationary satellites, recharge feeding of computers, portable devices. Although the electrode of hydr
Publicado em: 2005
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8. CINÉTICA DO ELETRODO DE FES2 / FE EM SAIS FUNDIDOS / FES2 / FE ELECTRODE KINETICS IN MOLTEN SALTS
In this work the measurement of the critical kinetics parameters of iron disulphide electrochemical reduction in molten chloride halides mixture was made. This cathode is applied as alternative material in high technology systems, such as, solar energy collector`s components, anode depolariser for hydrogen production and cathodic materials for high energy de
Publicado em: 2005
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9. Transporte de carga em compósitos de polianilina/V2O5
In this work, composites formed from a mixture of V2O5 and polyaniline (PANI) were investigated, for applications as cathode materials for secondary lithium batteries. Electrochemical quartz crystal microbalance (EQCM) data show that charge compensation in the [PANI]0.3V2O5 nanocomposite is achieved predominantly by Li+ migration. However, the charge compens
Química Nova. Publicado em: 2004-06
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10. SÍNTESE E CARACTERIZAÇÃO DO DISSULFETO DE FERRO (FES2) / SYNTHESIS AND CHARACTERIZATION OF IRON DISULFIDE (FES2)
Iron disulfide can be used as an alternative material in high technological systems, as an example, solar energy collectors and cathodic component in primary and secondary batteries. The present work studies the kinetics and thermodynamics of the iron disulfide synthesis in a fluidized bed reactor for temperatures varying from 400ºC to 500ºC, operating
Publicado em: 2004
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11. Materiais para cátodos de baterias secundárias de lítio
In this work, cathodes employed in secondary lithium batteries are reviewed. These cathodes have great technologic and scientific importance, specifically, materials for cathodes as electronic conductor polymers (ECP), transition metal oxides (TMO) and nanocomposites of ECP/TMO. The use of a specific cathodic material is based in some intrinsic characteristi
Química Nova. Publicado em: 2002-05
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12. Sex and the Single Cell. I. on the Action of Major Loci Affecting Sex Determination in DROSOPHILA MELANOGASTER
Sex determination in Drosophila melanogaster is under the control of the X chromosome:autosome ratio and at least four major regulatory genes: transformer (tra), transformer-2 (tra-2), doublesex (dsx) and intersex (ix). Attention is focused here on the roles of these four loci in sex determination. By examining the sexual phenotype of clones of homozygous mu