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Related Concept Videos

High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

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.
In HPLC, two phases play a critical role in the separation process:
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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High-Entropy Non-Flammable Ionic Liquid/Dimethoxymethane Composite Electrolyte for High-Performance Lithium-Ion

Purna Chandra Rath1, Chun-Yen Chen1, Jagabandhu Patra1,2

  • 1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 17, 2025
PubMed
Summary

A novel high-entropy ionic liquid/ether composite electrolyte enhances lithium-ion battery safety and performance. This advanced electrolyte enables stable 4.5V operation with graphite and high-nickel cathodes.

Keywords:
electrolyte engineeringgraphite compatibilityhigh safetyhigh voltageoperando analysissynergistic additive effects

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-energy-density and safe lithium-ion batteries are crucial for next-generation energy storage.
  • Current electrolytes face challenges with safety, stability, and performance at high voltages.
  • Advancements in electrolyte composition are needed to overcome these limitations.

Purpose of the Study:

  • To develop and characterize a novel high-entropy ionic liquid/ether composite electrolyte.
  • To investigate the unique coordination structure and its impact on ion transport and interphase formation.
  • To evaluate the electrolyte's performance in high-voltage lithium-ion batteries with advanced electrode materials.

Main Methods:

  • Synthesis of a composite electrolyte comprising N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMP-TFSI) ionic liquid, dimethoxymethane (DME), lithium difluoro(oxalato)borate (LiDFOB), fluoroethylene carbonate (FEC), and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE).
  • Analysis of the electrolyte's coordination structure and its effect on Li+ desolvation kinetics and solid-electrolyte interphase (SEI) chemistry.
  • Electrochemical testing of full cells using graphite and SiOₓ anodes, and a LiNi₀.₈Co₀.₁Mn₀.₁O₂ cathode at 4.5V.
  • Operando X-ray diffraction (XRD) to study ion intercalation behavior.

Main Results:

  • The proposed electrolyte exhibits low flammability, high thermal stability, and negligible corrosivity towards aluminum current collectors.
  • It operates stably at potentials up to 5V and demonstrates excellent compatibility with graphite, SiOₓ anodes, and LiNi₀.₈Co₀.₁Mn₀.₁O₂ cathodes.
  • Operando XRD confirmed the suppression of DME and PMP⁺ co-intercalation into graphite, a common issue.
  • A 4.5V LiNi₀.₈Co₀.₁Mn₀.₁O₂//graphite full cell showed superior specific capacity, rate capability, and cycling stability.

Conclusions:

  • The high-entropy ionic liquid/ether composite electrolyte offers a promising solution for high-voltage, high-safety lithium-ion batteries.
  • The unique coordination environment within the electrolyte contributes to improved interfacial stability and ion transport.
  • This electrolyte demonstrates significant potential for practical applications in advanced energy storage systems.