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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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: May 25, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Constructing a Dielectric Fluorinated Solid Electrolyte for Practically Operated All-Solid-State Lithium-Metal

Xianda Ma1, Shuhui Ge1, Shuo Chen1

  • 1Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China.

ACS Nano
|February 28, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel solid electrolyte for all-solid-state lithium-metal batteries. This porous dielectric fluorinated electrolyte enables rapid ion conduction and stable cycling, overcoming key operational constraints.

Keywords:
all-solid-state lithium-metal batterydielectric fluorinated electrolyteencapsulation strategyhigh room-temperature ion conductivitylithium ion complex

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • All-solid-state lithium-metal batteries offer enhanced safety but are limited by solid electrolyte performance.
  • Inferior solid electrolytes hinder ion transport and long-term cycling stability.

Purpose of the Study:

  • To develop a novel solid electrolyte for improved ion conduction and interface stability in lithium-metal batteries.
  • To address the limitations of current solid electrolytes in all-solid-state battery applications.

Main Methods:

  • Fabrication of a porous nanofiber (NF) skeleton using dielectric fluorinated BaTiO3 (F-BaTiO3-δ) and PVDF-b-PTFE.
  • Encapsulation of a poly(ethylene oxide) (PEO)-LiTFSI filler within the NF skeleton to form a Li+ complex.
  • Characterization of ionic conductivity, activation energy, and electrochemical performance of the developed electrolyte.

Main Results:

  • Achieved high room-temperature ionic conductivity of 5.64 × 10-4 S cm-1 with low activation energy (0.21 eV).
  • Demonstrated dynamic interface stability, eliminating space charge layers and internal stress.
  • All-solid-state LiFePO4//Li batteries showed stable cycling over 1000 cycles with 87.45% capacity retention.

Conclusions:

  • The developed porous dielectric fluorinated electrolyte significantly enhances ion conduction and cycling stability in lithium-metal batteries.
  • The electrolyte's unique structure promotes stable interfaces, crucial for battery longevity.
  • The technology shows promise for commercial applications, as evidenced by large-scale pouch cell tests.