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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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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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Colligative Properties of Electrolytes
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Highly entangled P(VDF-TrFE) solid-state electrolytes for enhanced performance of solid-state lithium batteries.

Hanghua Wu1, Shuangfeng Li1, Weiwei Zhu2

  • 1Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University Shenzhen 518055 P. R. China yanfeihuang@szu.edu.cn renbaohui@szu.edu.cn.

Chemical Science
|November 5, 2025
PubMed
Summary

This study enhances solid polymer electrolytes (SPEs) for safer lithium metal batteries (LMBs) by optimizing P(VDF-TrFE) molecular structure. This improves ion transport and battery stability, exceeding 5000 hours of cycling.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid polymer electrolytes (SPEs) are crucial for safer lithium metal batteries (LMBs).
  • Conventional poly(vinylidene fluoride) (PVDF)-based SPEs suffer from tortuous ion pathways and poor chain entanglement, leading to dendrite growth and unstable cycling.
  • Optimizing polymer chain conformation and entanglement is key to improving ion transport and battery performance.

Purpose of the Study:

  • To develop advanced SPEs for lithium metal batteries by addressing limitations in conventional PVDF-based electrolytes.
  • To enhance ion transport efficiency and uniformity within SPEs through molecular design.
  • To improve the cycling stability and safety of lithium metal batteries.

Main Methods:

  • Synthesized ultrahigh molecular weight poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) via suspension polymerization.
  • Stabilized the TTTT conformation (β-phase) for enhanced intra-chain ion transport.
  • Increased chain entanglement density to create a 3D ion transport network.

Main Results:

  • Achieved continuous, low-resistance fluorine channels for efficient Li+ transport.
  • Established a 3D interconnected ion transport network, eliminating inactive microregions and homogenizing Li+ flux.
  • Demonstrated exceptional cycling stability (>5000 hours) in Li//Li symmetric cells, a 16-fold improvement over lower molecular weight counterparts.
  • Showcased good cycling stability in LiNi0.8Co0.1Mn0.1O2 (NCM811)//Li full cells.

Conclusions:

  • Dual optimization of molecular conformation and topological structure in P(VDF-TrFE) SPEs significantly enhances ion transport continuity and uniformity.
  • The developed SPEs offer a promising strategy for high-performance and safe solid-state lithium metal batteries.
  • This approach provides a pathway for overcoming critical challenges in current solid-state battery technology.