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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
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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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
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High-Performance Liquid Chromatography: Introduction01:11

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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
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High-Performance Liquid Chromatography: Instrumentation00:57

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High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
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Ionic Radii03:10

Ionic Radii

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Designing Poly(ionic liquid)s as High-Performance LiFePO4 Binders via Mechanistic Study and ML-Assisted

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New poly(ionic liquid) binders significantly enhance lithium-ion battery performance by improving lithium-ion transport and reducing fluorine content. These advanced binders offer a sustainable pathway for high-rate, stable lithium iron phosphate (LFP) cathodes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Conventional lithium iron phosphate (LFP) cathodes using poly(vinylidene fluoride) (PVDF) binders face limitations in ionic conductivity, rate capability, and high-current cycling stability.
  • PVDF binders also raise environmental concerns due to their high fluorine content.

Purpose of the Study:

  • To develop novel poly(ionic liquid) (PIL) binders that enhance lithium-ion transport and improve the electrochemical performance of LFP cathodes.
  • To investigate the anion-cluster-mediated Li+ hopping mechanism facilitated by PIL binders.
  • To establish a molecular design framework for next-generation PIL binders using machine learning.

Main Methods:

  • Synthesis of multifunctional poly(ionic liquid) binders.
  • Electrochemical characterization including cyclic voltammetry and galvanostatic cycling at various rates.
  • Nuclear magnetic resonance spectroscopy and molecular dynamics simulations to elucidate Li+ transport mechanisms.
  • Integration of chemistry-informed machine learning with experimental validation.

Main Results:

  • PIL binders accelerated Li+ transport by 140-200% and reduced fluorine content by 60%.
  • Optimized LFP-PIL cathodes demonstrated high-rate performance (100 mAh·g-1 at 15C) and excellent cycling stability (95.5% capacity retention after 500 cycles at 5C).
  • Anion aggregation in PILs was identified as key to promoting Li+ migration.

Conclusions:

  • Poly(ionic liquid) binders offer a promising strategy for developing high-performance, sustainable lithium-ion battery cathodes.
  • The anion-cluster-mediated Li+ hopping mechanism provides crucial mechanistic insight into enhanced battery performance.
  • A generalizable design framework for advanced PIL binders was established, paving the way for future material development.