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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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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Oxygen vacancy chemistry in oxide cathodes.

Yu-Han Zhang1,2,3,4, Shu Zhang1,3,4, Naifang Hu1,3,4

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Oxygen vacancies (OVs) are critical defects in transition metal oxide batteries, significantly impacting performance. Understanding their formation and impact is key to developing advanced energy storage materials for secondary batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Secondary batteries are crucial for clean energy, with oxide cathodes offering high capacity.
  • Oxygen vacancies (OVs) are prevalent defects in transition metal oxide batteries, affecting performance.

Purpose of the Study:

  • To review the role of intrinsic and anionic redox-mediated OVs in secondary batteries.
  • To discuss OV formation, evolution, and impact on oxide cathode properties.

Main Methods:

  • Literature review of studies on OVs in secondary batteries over recent decades.
  • Analysis of thermodynamic and kinetic perspectives on OV formation and impact.

Main Results:

  • OVs significantly influence the thermodynamic and kinetic properties of oxide cathodes.
  • Both bulk and surface OVs play a crucial role in battery performance.

Conclusions:

  • Insights into utilizing OVs to enhance battery energy density and lifespan.
  • Advancing the understanding of OVs to drive the development of high-performance electrode materials.