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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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Video Experimental Relacionado

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Ag4V2O6F2: una fase electroquímica activa y de alta densidad de plata.

Erin M Sorensen1, Heather K Izumi, John T Vaughey

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.

Journal of the American Chemical Society
|April 28, 2005
PubMed
Resumen

Se sintetizó y probó un nuevo fluoruro de óxido de vanadio plateado (Ag(4)V(2)O(6)F(2) como cátodo primario de la batería de litio. Muestra una capacidad prometedora y un voltaje operativo más alto que los materiales de óxido de vanadio de plata existentes.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • La electroquímica es electroquímica.

Sus antecedentes:

  • El desarrollo de nuevos materiales de cátodo es crucial para el avance de la tecnología de baterías de litio primarias.
  • Los óxidos de vanadio de plata son materiales de cátodo establecidos, pero explorar nuevas composiciones puede mejorar el rendimiento.

Objetivo del estudio:

  • Para sintetizar y caracterizar una nueva fase de fluoruro de óxido de vanadio de plata, Ag(4)V(2)O(6)F(2).
  • Para evaluar el rendimiento electroquímico de Ag{4) V{2) O{6) F{2) como material de cátodo para baterías primarias de litio.

Principales métodos:

  • Síntesis hidrotermal a baja temperatura para el crecimiento de un solo cristal.
  • Difracción de rayos X monocristalino y espectroscopia de infrarrojos para la caracterización estructural.
  • Evaluación electroquímica como cátodo de una batería de litio primaria.

Principales resultados:

  • Se ha sintetizado y caracterizado con éxito una nueva fase monoclínica, Ag(4)V(2)O(6)F(2) (grupo espacial P2(1)/n).
  • El material exhibe dos regiones de descarga a 3.5 V y 2.3 V, atribuidas a la reducción del marco de fluoruro de óxido de vanadio.
  • Alcanzó una capacidad nominal de 251 mAh/g, con 148 mAh/g por encima de 3 V, y una meseta de 3,5 V significativamente más alta que Ag{2) V{4) O{11).

Conclusiones:

  • Ag ((4) V ((2) O ((6) F ((2)) es un nuevo material de cátodo viable para baterías de litio primarias.
  • El mayor voltaje de funcionamiento y la capacidad sugieren potencial para mejorar el rendimiento de la batería.
  • Se justifica una mayor investigación para optimizar este fluoruro de óxido para aplicaciones de baterías.