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High-Performance Solid Composite Polymer Electrolyte for all Solid-State Lithium Battery Through Facile

Jingjing Yang1, Xun Wang1, Gai Zhang1

  • 1School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, China.

Frontiers in Chemistry
|June 20, 2019
PubMed
Summary
This summary is machine-generated.

We developed a novel solid composite polymer electrolyte for lithium batteries using poly(ethylene oxide), graphitic-like carbon nitride, and lithium perchlorate. Thermal annealing significantly improved its performance, leading to enhanced conductivity and battery cycle stability.

Keywords:
all solid-state lithium batteryelectrochemical propertygraphite-like carbonitridemicrostructuresolid composite polymer electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Solid composite polymer electrolytes are crucial for all-solid-state lithium batteries due to their high ionic conductivity, cycle life, and lithium anode compatibility.
  • Developing advanced electrolytes is key to improving battery performance and safety.

Purpose of the Study:

  • To synthesize and characterize a novel solid composite polymer electrolyte based on poly(ethylene oxide), graphitic-like carbon nitride (g-C3N4), and lithium perchlorate.
  • To investigate the effect of thermal annealing on the microstructure and electrochemical properties of the electrolyte.
  • To evaluate the performance of the developed electrolyte in LiFePO4/Li solid-state batteries.

Main Methods:

  • Solution blending method for electrolyte preparation.
  • Thermal annealing for microstructure regulation.
  • Characterization using XRD, DSC, FTIR-ATR, and ROM.
  • Electrochemical testing of ionic conductivity, electrochemical stable window, and lithium ion transference number.
  • Battery performance evaluation (discharge capacity, cycle stability) at 80°C.

Main Results:

  • Achieved an ionic conductivity of 1.76 × 10^-5 S cm^-1 at 25°C.
  • Enhanced electrochemical stable window and lithium ion transference number (t+).
  • LiFePO4/Li batteries demonstrated a high initial discharge capacity (161.2 mAh g^-1) and excellent cycle stability (81% retention after 200 cycles at 1C).

Conclusions:

  • Thermal annealing and the incorporation of g-C3N4 are critical for enhancing the performance of solid composite polymer electrolytes.
  • The developed electrolyte shows significant promise for high-performance all-solid-state lithium batteries.
  • This work highlights a viable strategy for designing advanced electrolytes for next-generation energy storage.