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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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High-Rate Solid Polymer Electrolyte Based Flexible All-Solid-State Lithium Metal Batteries.

Zhiyan Wang1,2, Junfeng Ma1, Ping Cui1,2

  • 1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.

ACS Applied Materials & Interfaces
|July 19, 2022
PubMed
Summary
This summary is machine-generated.

A flexible solid composite polymer electrolyte using poly(vinylidene fluoride)-polyetherimide@poly(ethylene glycol) (PVDF-PEI@PEG) shows excellent ionic conductivity and stability. This material demonstrates potential for high-performance lithium-ion batteries.

Keywords:
all-solid-state lithium metal batteriesflexibleporous membrane skeletonsolid polymer electrolytesuperior rate performance

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Development of solid-state electrolytes is crucial for safer and more efficient energy storage.
  • Polymer electrolytes offer flexibility and potential for high energy density batteries.
  • Challenges include achieving high ionic conductivity and long-term stability.

Purpose of the Study:

  • To prepare and characterize a novel flexible poly(vinylidene fluoride)-polyetherimide@poly(ethylene glycol) (PVDF-PEI@PEG) solid composite polymer electrolyte.
  • To investigate the influence of optimized PVDF and PEI ratios on the electrolyte's structure and ion transport properties.
  • To evaluate the electrochemical performance and stability of the PVDF-PEI@PEG electrolyte in lithium-ion battery applications.

Main Methods:

  • In situ thermal curing approach for preparing the PVDF-PEI@PEG composite membrane.
  • Characterization of the membrane's morphology, amorphous phase, and ion transport channels.
  • Electrochemical testing including ionic conductivity, lithium ion transference number, and electrochemical stability window measurements.
  • Long-term cycling tests of Li//Li symmetric cells and LiFePO4//Li batteries.

Main Results:

  • An optimized PVDF-PEI composite porous membrane was successfully prepared, enhancing the amorphous phase and facilitating fast lithium ion transport.
  • The electrolyte achieved high ionic conductivity (2.36 × 10-4 S cm-1 at 60 °C), a high lithium ion transference number (0.578), and a wide electrochemical stability window (5.5 V).
  • Superior stability was demonstrated with over 3600 hours of cycling in a Li//Li symmetric cell, and the LiFePO4//Li battery delivered high specific capacities with excellent retention at high rates.

Conclusions:

  • The flexible PVDF-PEI@PEG solid composite polymer electrolyte exhibits promising properties for advanced energy storage.
  • The material demonstrates high ionic conductivity, excellent electrochemical stability, and superior cycling performance.
  • This composite electrolyte shows significant feasibility for developing high-rate capability lithium-ion batteries.