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Videos de Conceptos Relacionados

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...
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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La estructura de Li2FeSiO4 es la siguiente:

Shin-ichi Nishimura1, Shogo Hayase, Ryoji Kanno

  • 1Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8502, Japan.

Journal of the American Chemical Society
|September 16, 2008
PubMed
Resumen

Los investigadores determinaron la estructura cristalina del silicato de hierro de litio, un material de cátodo prometedor para baterías de iones de litio más ecológicas. Esta nueva estructura, más grande que los modelos anteriores, se origina a partir de tetraedros modulados, avanzando la tecnología de la batería.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • La electroquímica es electroquímica.
  • Química del estado sólido.

Sus antecedentes:

  • Las baterías de iones de litio son cruciales para un futuro sostenible.
  • El silicato de hierro de litio (LIS) es un material de cátodo prometedor debido a la abundancia de elementos y el potencial para reacciones multielectrónicas.
  • La estructura cristalina de Li2FeSiO4, una composición clave de LIS, permaneció previamente indeterminada.

Objetivo del estudio:

  • Para elucidar la estructura cristalina de Li2FeSiO4.4.
  • Comprender la base estructural de las propiedades electroquímicas de los materiales de cátodo LIS.

Principales métodos:

  • Difracción de rayos X sincrotrón de alta resolución.
  • Experimentos de difracción de electrones.

Principales resultados:

  • Se determinó con éxito la estructura cristalina de Li2FeSiO4.
  • La estructura determinada exhibe una superred dos veces el tamaño de los modelos anteriores basados en beta-Li3PO4.
  • El origen de la superred fue identificado como una modulación periódica de la coordinación tetraédrica.

Conclusiones:

  • La estructura cristalina determinada proporciona información fundamental sobre los materiales de silicato de litio y hierro.
  • Esta comprensión estructural es vital para optimizar el rendimiento del cátodo LIS en las baterías de iones de litio de próxima generación.
  • Los hallazgos allanan el camino para el desarrollo de tecnologías avanzadas de baterías para una sociedad más verde.