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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.
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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Mg-Ion Battery Electrode: An Organic Solid's Herringbone Structure Squeezed upon Mg-Ion Insertion.

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Crystalline organic 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) efficiently stores divalent ions like magnesium (Mg2+) and calcium (Ca2+) in aqueous electrolytes, showing unique structural changes and stable performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Organic Electronics

Background:

  • Organic solids offer potential for energy storage applications.
  • Divalent metal ions present challenges for intercalation into electrode materials.

Purpose of the Study:

  • To investigate the storage of divalent metal ions (Mg2+, Ca2+) in crystalline 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA).
  • To understand the structural and electrochemical behavior of PTCDA during ion hosting.

Main Methods:

  • Experimental techniques: ex situ X-ray diffraction (XRD) and transmission electron microscopy (TEM).
  • Theoretical investigations: first-principles calculations.
  • Electrochemical testing: cyclic voltammetry, galvanostatic charge-discharge cycling.

Main Results:

  • PTCDA effectively hosts Mg2+ and Ca2+ in aqueous electrolytes.
  • Mg2+ intercalation induces unique anisotropic squeezing deformation in the PTCDA structure.
  • PTCDA Mg-ion electrode exhibits a reversible capacity of 125 mA h g-1, good rate capability, and stable cycling.
  • Ca2+ storage in PTCDA yields a reversible capacity exceeding 80 mA h g-1.

Conclusions:

  • The van der Waals structure of PTCDA is well-suited for hosting charge-dense divalent ions.
  • Understanding the ion-induced structural changes is crucial for designing high-performance organic electrodes.
  • PTCDA demonstrates promise as a cathode material for aqueous divalent ion batteries.