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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Building Polymeric Framework Layer for Stable Solid Electrolyte Interphase on Natural Graphite Anode.

Yunhao Zhao1, Yueyue Wang1, Rui Liang2

  • 1College of Energy, Soochow University, Suzhou 215006, China.

Molecules (Basel, Switzerland)
|November 26, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new artificial solid electrolyte interphase (SEI) layer for natural graphite (NG) anodes. This modification significantly enhances initial coulombic efficiency, rate capability, and cycle life in lithium-ion batteries (LIBs).

Keywords:
artificial SEIin situ polymerizationlithium-ion batteriesnatural graphite

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • The electrochemical performance of natural graphite (NG) anodes in lithium-ion batteries (LIBs) is heavily influenced by the solid electrolyte interphase (SEI) layer.
  • Unstable SEI formation leads to high irreversible capacity loss and poor cycling stability.
  • Existing methods for SEI modification often fall short in providing robust and efficient solutions.

Purpose of the Study:

  • To design and synthesize a novel artificial SEI layer for natural graphite anodes.
  • To improve the electrochemical performance of NG anodes by suppressing electrolyte decomposition and enhancing Li+ conduction.
  • To investigate the mechanisms behind the artificial SEI formation and its impact on battery performance.

Main Methods:

  • Grafting acrylic acid (AA) and N,N'-methylenebisacrylamide (MBAA) onto the NG surface via in situ polymerization to create a functional molecular cross-linking framework.
  • Characterization of the artificial SEI layer's structure, stability, and ionic conductivity.
  • Electrochemical testing of modified NG anodes in half-cells and full cells (with LiNi0.5Co0.2Mn0.3O2 cathode).

Main Results:

  • The artificial SEI layer exhibits excellent stability, flexibility, and compactness due to robust covalent bonding and functional groups (-COOH, -CONH).
  • Modified NG anodes show significantly improved initial coulombic efficiency, rate performance, and cycling stability compared to pristine NG.
  • Full cells with modified NG anodes demonstrate a prolonged cycle life, retaining 82.75% capacity after 500 cycles.

Conclusions:

  • The functional polymeric framework effectively creates a stable and conductive artificial SEI layer on NG anodes.
  • This surface modification strategy offers an efficient and feasible approach to enhance the performance of NG anodes in LIBs.
  • The study provides valuable insights into SEI engineering for next-generation energy storage devices.