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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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Related Experiment Video

Updated: Jan 17, 2026

Construction and Testing of Coin Cells of Lithium Ion Batteries

Construction and Testing of Coin Cells of Lithium Ion Batteries

Published on: August 2, 2012

Single-Crystal vs Polycrystalline Cathodes for Lithium-Ion Batteries.

Geon-Tae Park¹, Hoon-Hee Ryu², Nam-Yung Park¹

¹Department of Energy Engineering, Hanyang University, Seoul 04763, South Korea.

Chemical Reviews

|September 22, 2025

Summary

Single-crystal cathode materials offer superior structural stability for lithium-ion batteries (LIBs) compared to polycrystalline cathodes, addressing cracking issues and enabling higher energy densities.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Increasing demand for high-energy-density lithium-ion batteries (LIBs) drives development of high-nickel content cathode materials.
Polycrystalline (PC) cathodes face structural instability and cracking, limiting performance.
Single-crystal (SC) cathodes emerge as a promising alternative due to enhanced structural integrity.

Purpose of the Study:

To comprehensively review degradation mechanisms, synthesis challenges, and electrochemical behaviors of SC cathodes.
To compare the characteristics of SC cathodes with PC cathodes.
To provide insights for designing durable, high-energy LIB cathode materials.

Main Methods:

Literature review focusing on nanoscale-to-microscale degradation.
Comparative analysis of structural and kinetic properties of SC and PC cathodes.
Examination of synthesis strategies and electrochemical performance.

Main Results:

SC cathodes exhibit inherent resistance to intergranular cracking, maintaining structural stability.
Distinct structural and kinetic properties differentiate SC from PC cathodes.
Understanding these differences is key to optimizing cathode material design.

Conclusions:

SC cathode materials present a viable strategy for developing next-generation LIBs with improved durability and energy density.
Rational design based on SC characteristics can overcome limitations of PC materials.
Further research into SC cathode synthesis and degradation is crucial for advancing battery technology.