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Ionic Crystal Structures

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...

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Trends in Lattice Energy: Ion Size and Charge

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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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

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Published on: October 27, 2018

Structure of Li2FeSiO4.

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

Summary

This summary is machine-generated.

Researchers determined the crystal structure of lithium iron silicate, a promising cathode material for greener lithium-ion batteries. This new structure, larger than previous models, originates from modulated tetrahedra, advancing battery technology.

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Area of Science:

Materials Science
Electrochemistry
Solid-State Chemistry

Background:

Lithium-ion batteries are crucial for a sustainable future.
Lithium iron silicate (LIS) is a promising cathode material due to abundant elements and potential for multielectron reactions.
The crystal structure of Li2FeSiO4, a key LIS composition, remained previously undetermined.

Purpose of the Study:

To elucidate the crystal structure of Li2FeSiO4.
To understand the structural basis for the electrochemical properties of LIS cathode materials.

Main Methods:

High-resolution synchrotron X-ray diffraction.
Electron diffraction experiments.

Main Results:

The crystal structure of Li2FeSiO4 was successfully determined.
The determined structure exhibits a superlattice twice the size of previous beta-Li3PO4-based models.
The superlattice's origin was identified as periodic modulation of coordination tetrahedra.

Conclusions:

The determined crystal structure provides fundamental insights into lithium iron silicate materials.
This structural understanding is vital for optimizing LIS cathode performance in next-generation lithium-ion batteries.
The findings pave the way for developing advanced battery technologies for a greener society.