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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Formation of Complex Ions03:45

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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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Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Updated: Jun 13, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Multifunctional COF Colloid Regulates Anion Coordination in Solid Poly(Ionic Liquid)-Based Electrolyte for Lithium

Hui Chang1,2, Jinling Zhong2, Zeao Kang2

  • 1School of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 17, 2025
PubMed
Summary

Researchers developed advanced solid polymer electrolytes (SPEs) using covalent organic framework colloids (COF-C) to improve lithium-ion battery performance. This innovation enhances ionic conductivity and ensures uniform lithium deposition for safer, more stable batteries.

Keywords:
anion coordinationmultifunctional additivepoly(ionic liquid)solid‐state lithium metal batteriesultra‐low content

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid polymer electrolytes (SPEs) face challenges in ionic conductivity and uniform lithium metal anode deposition.
  • Reducing polymer crystallization and creating stable ion transport pathways are crucial for improving SPE performance.

Purpose of the Study:

  • To incorporate covalent organic framework colloid (COF-C) as an additive in SPEs.
  • To regulate lithium transport and establish stable electrolyte-electrode interphases.
  • To overcome limitations of low ionic conductivity and inhomogeneous lithium deposition in SPEs.

Main Methods:

  • Incorporation of COF-C as a multifunctional additive into poly(ionic liquid) (PIL) based SPEs.
  • Investigating the interaction between COF-C and PIL anions to control polymer crystallization.
  • Analyzing the role of COF-C as an anion receptor for uniform Li+ distribution and enhanced ion transport.
  • Evaluating the formation of stable solid-state electrolyte interphases.

Main Results:

  • COF-C addition restricted PIL crystal growth, reducing electrolyte crystallinity.
  • Optimized SPEs achieved an ionic conductivity of 2.70 × 10^-4 S cm^-1 at 25 °C.
  • Solid-state batteries (Li/PIL-COF-C/LiFePO4) exhibited excellent cycle stability with 93.1% capacity retention after 500 cycles.
  • The PIL-COF-C system supported higher mass loading of LiFePO4.

Conclusions:

  • COF-C effectively enhances ionic conductivity and regulates lithium deposition in SPEs.
  • The developed SPEs demonstrate significant potential for high-performance, stable solid-state lithium-ion batteries.
  • This approach offers a viable strategy for advancing next-generation energy storage solutions.