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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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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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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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Identifying a Li-rich superionic conductor from charge-discharge structural evolution study: Li2MnO3.

Xiaofeng Zhang1, Feng Zheng, Shunqing Wu

  • 1Department of Physics, OSED, Key Laboratory of Low Dimensional Condensed Matter Physics (Department of Education of Fujian Province), Jiujiang Research Institute, Xiamen University, Xiamen 361005, China. zhengfeng@stu.xmu.edu.cn wsq@xmu.edu.cn.

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This summary is machine-generated.

Researchers explored the electrochemical reactions in Li₂MnO₃, a key component in Li-rich materials. They discovered a stable trigonal phase with high ionic conductivity, identifying it as a promising lithium superionic conductor.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Lithium-rich manganese-based layered materials are crucial for advanced battery technologies.
  • Understanding the electrochemical behavior and structural evolution of Li₂MnO₃ is essential for optimizing its performance.

Purpose of the Study:

  • To investigate the structural evolution of monoclinic Li₂MnO₃ during delithiation using first-principles calculations.
  • To identify and characterize any new phases formed during the electrochemical process.
  • To assess the stability and ionic conductivity of the identified phases.

Main Methods:

  • First-principles calculations based on density functional theory (DFT).
  • Phonon and molecular dynamics simulations.
  • Analysis of structural transformations and phase stability.

Main Results:

  • A phase transformation occurs during delithiation, forming a new trigonal phase (LiₓMnO₃, x=0.5) with P3[combining macron]1m symmetry.
  • The trigonal Li₂MnO₃ phase is dynamically and thermodynamically stable.
  • The trigonal Li₂MnO₃ exhibits high ionic conductivity (0.36 S cm⁻¹) in the ab plane.

Conclusions:

  • The trigonal Li₂MnO₃ phase is a stable intermediate during the delithiation of Li-rich Mn-based layered materials.
  • This trigonal phase demonstrates excellent lithium ion conductivity, positioning it as a promising candidate for lithium superionic conductors.