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Related Concept Videos

Ionic Bonding and Electron Transfer02:48

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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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Updated: Aug 18, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Single-Ion Conducting Polymeric Protective Interlayer for Stable Solid Lithium-Metal Batteries.

Xinyuan Shan1, Sheng Zhao2, Mengxiang Ma1

  • 1Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.

ACS Applied Materials & Interfaces
|December 9, 2022
PubMed
Summary

Researchers developed a novel single-ion conducting polymeric protective interlayer (SIPPI) to enhance polymer electrolytes for safer, high-energy solid-state batteries. This SIPPI improves ionic conductivity and cycling stability, paving the way for advanced battery technologies.

Keywords:
Li-metal batteriespolymer electrolytepolymeric protective interlayersingle-ion conductingsolid-state battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Single-ion conducting polymer electrolytes are crucial for solid-state batteries but often exhibit low ionic conductivity, limited voltage windows, and high costs.
  • Existing polymer electrolytes face challenges in achieving high cationic transport numbers, hindering their performance and safety.

Purpose of the Study:

  • To develop a novel single-ion conducting polymeric protective interlayer (SIPPI) to enhance the performance of conventional polymer electrolytes (PVEC).
  • To improve the cationic transport number (tLi+) and overall electrochemical stability of polymer electrolytes for lithium-metal batteries.

Main Methods:

  • Fabrication of a single-ion conducting polymeric protective interlayer (SIPPI) designed to be placed between a conventional polymer electrolyte (PVEC) and a lithium-metal electrode.
  • Electrochemical characterization including ionic conductivity measurements, cationic transport number determination, and voltage stability testing.
  • Assembly and cycling of lithium symmetrical cells and full cells utilizing the SIPPI-enhanced polymer electrolyte.

Main Results:

  • The integrated SIPPI with PVEC electrolyte achieved a satisfactory ionic conductivity of 1 mS cm-1 at 30 °C and a high cationic transport number (tLi+) of 0.79.
  • The system demonstrated wide-area voltage stability and significantly improved cycling performance.
  • Lithium symmetrical cells cycled stably for over 6000 hours at 3 mA cm-2, and full cells retained 86% capacity after 1000 cycles at 1 C.

Conclusions:

  • The developed SIPPI strategy effectively enhances the cationic transport and electrochemical properties of polymer electrolytes.
  • This approach offers a viable pathway for creating safe, cost-effective, high-energy density solid-state batteries with long cycle lives.
  • The SIPPI serves as a protective interlayer, addressing key limitations of current polymer electrolyte systems for advanced lithium batteries.