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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. 
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Baterías recargables de Na/Cl2 y Li/Cl2

Guanzhou Zhu1, Xin Tian1, Hung-Chun Tai2

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Los investigadores desarrollaron baterías recargables de sodio/cloro o litio/cloro utilizando electrodos de carbono avanzados y nuevos electrolitos. Este avance permite el almacenamiento de alta densidad de energía para aplicaciones futuras.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de los materiales
  • Almacenamiento de energía

Sus antecedentes:

  • Las baterías primarias de cloruro de litio (Li-SOCl2), inventadas en la década de 1970, ofrecen una alta densidad de energía pero no son recargables.
  • Estas baterías primarias utilizan ánodos de metal de litio, cátodos de carbono amorfo y católitos SOCl2, que se descargan a través de la oxidación del litio y la reducción del católito.

Objetivo del estudio:

  • Desarrollar un sistema recargable de baterías secundarias de metal alcalino y cloro.
  • Para superar la limitación de las baterías primarias de cloruro de litio no recargables.

Principales métodos:

  • Utilizó un electrodo positivo de carbono altamente microporoso.
  • Se utilizó un electrolito inicial de cloruro de aluminio en SOCl2 con aditivos de fluoruro.
  • Se utiliza el metal de sodio o litio como electrodo negativo.

Principales resultados:

  • Se ha demostrado un sistema de baterías recargables de Na/Cl2 o Li/Cl2.
  • Se logra la recargabilidad a través de la redox reversible de Cl2/NaCl o Cl2/LiCl dentro del carbono microporoso.
  • Estabilizó el electrodo negativo utilizando una fina interfaz de electrolito sólido de cloruro de alcalino dopado con fluoruro alcalino.

Conclusiones:

  • Las baterías secundarias de metal alcalino/cloro desarrolladas son recargables debido a la química redox reversible del cloro en el carbono microporoso.
  • La interfaz de electrodo negativo estabilizado es crucial para el rendimiento de la batería secundaria.
  • Este trabajo allana el camino para la próxima generación de baterías recargables de alta densidad energética.