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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Related Experiment Video

Updated: Jun 6, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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An ionic-liquid functionalized metal-organic framework and its high performance as a solid electrolyte for

Xiang Kun Cui1, Yu Ding1, Li Feng1

  • 1Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing 100048, China. wancq@cnu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|November 25, 2024
PubMed
Summary

We developed a novel crystalline solid-state electrolyte by integrating a lithium ionic liquid into a metal-organic framework (MOF). This material shows high ionic conductivity and efficient lithium-ion transport for advanced lithium-ion batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Metal-organic frameworks (MOFs) are gaining interest as solid-state electrolyte matrices.
  • Developing stable and high-performance solid-state electrolytes is crucial for next-generation lithium-ion batteries.

Purpose of the Study:

  • To synthesize and characterize a new crystalline solid-state electrolyte based on a MOF and a lithium ionic liquid.
  • To investigate the ion transport properties and electrochemical performance of the novel material.

Main Methods:

  • Covalent bonding of lithium ionic liquid (MIMS·LiTFSI) onto the UiO-67 MOF framework.
  • Electrochemical characterization including ionic conductivity measurements over a wide temperature range.
  • Structural analysis using characterization techniques to understand ion conduction pathways.

Main Results:

  • The crystalline ILLi-MOF exhibited high ionic conductivities (e.g., 1.62 × 10-3 S cm-1 at 30 °C and 1.26 × 10-2 S cm-1 at 110 °C).
  • Efficient Li+ transport was confirmed with a high transference number (tLi = 0.88).
  • The material demonstrated desirable properties such as non-flammability, stability, and no leakage.

Conclusions:

  • The ordered arrangement of ionic liquid within MOF channels facilitates high and efficient Li+ transfer.
  • This integrated strategy offers a promising approach for designing high-performance, safe solid-state electrolytes.
  • The developed ILLi-MOF presents a new avenue for advancing lithium-ion battery technology.