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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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A Multifunctional Gradient Solid Electrolyte Remarkably Improving Interface Compatibility and Ion Transport in

Lin-Xin Li1, Rui Li1, Zhen-Hao Huang1

  • 1Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.

ACS Applied Materials & Interfaces
|July 1, 2022
PubMed
Summary
This summary is machine-generated.

A novel gradient poly(1,3-dioxolane) (PDOL) electrolyte with a Li6.4La3Zr1.4Ta0.6O12 (LLZTO) layer enhances solid-state lithium battery performance. This design improves interface compatibility, ion transport, and lithium dendrite inhibition for stable cycling.

Keywords:
composite solid electrolytegradient structureinterfacemultifunctionalsolid-state lithium battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Solid-state lithium batteries require electrolytes with excellent interface compatibility and ion transport.
  • Achieving stable interfaces and efficient lithium-ion conduction remains a key challenge for practical applications.

Purpose of the Study:

  • To design and investigate a multifunctional composite electrolyte with a gradient structure for solid-state lithium batteries.
  • To enhance electrode/electrolyte interface compatibility, stability, and ion transport properties.

Main Methods:

  • Fabrication of a gradient poly(1,3-dioxolane) (PDOL) electrolyte incorporating a Li6.4La3Zr1.4Ta0.6O12 (LLZTO) interfacial modification layer.
  • Characterization of the composite electrolyte's structural, electrochemical, and interfacial properties.
  • Evaluation of battery performance using the developed electrolyte in NCM622/PDOL-LLZTO/Li cells.

Main Results:

  • The gradient PDOL/LLZTO composite electrolyte exhibited improved electrode/electrolyte interface compatibility, lower impedance, and reduced polarization.
  • The composite electrolyte demonstrated high ionic conductivity (2.9 × 10⁻⁴ S/cm) and a wide electrochemical window (4.9 V vs Li/Li⁺).
  • NCM622/PDOL-LLZTO/Li batteries showed stable cycling for 200 cycles at 0.3C and 25 °C, outperforming pristine electrolytes.

Conclusions:

  • The multifunctional gradient structure design effectively enhances the performance of solid-state lithium batteries.
  • This approach promotes the development of advanced solid electrolytes with improved interfacial properties and stability.
  • The gradient PDOL/LLZTO composite electrolyte shows significant potential for widespread application in next-generation solid-state lithium batteries.