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A Quasi-Double-Layer Solid Electrolyte with Adjustable Interphases Enabling High-Voltage Solid-State Batteries.

Jun Pan1, Yuchen Zhang2, Jian Wang3

  • 1State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, P. R. China.

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Summary
This summary is machine-generated.

Researchers developed novel quasi-double-layer composite polymer electrolytes (QDL-CPEs) for improved lithium-ion battery performance. These electrolytes enhance stability and cycling, paving the way for practical solid-state battery applications.

Keywords:
artificial cathode electrolyte interfacehigh redox stabilitypolymer solid-state lithium-ion batteriesquasi-double-layer solid electrolytesstable interfacial contact

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Achieving high energy density and long-term stability in lithium-ion batteries requires stable electrolytes and electrode interfaces.
  • Existing polymer and liquid electrolytes face limitations in electrochemical stability, leading to issues like lithium dendrite formation and electrolyte oxidation.
  • Stable electrode/electrolyte interfacial contact is crucial for preventing degradation under high/low voltage conditions.

Purpose of the Study:

  • To design and synthesize novel quasi-double-layer composite polymer electrolytes (QDL-CPEs).
  • To enhance the electrochemical stability and cycling performance of lithium-ion batteries.
  • To overcome the limitations of single-component electrolytes in achieving simultaneous oxidation and reduction stability.

Main Methods:

  • Development of QDL-CPEs using poly(vinylidene fluoride) (PVDF) as a base.
  • Incorporation of propylene carbonate (PC) for oxidation stability and diethylene glycol dimethyl ether (DGDME) for reduction stability.
  • In-situ polymerization of PC to form a cathode electrolyte interface (CEI) film and utilizing nucleophilic substitution between DGDME and PVDF.

Main Results:

  • The novel QDL-CPEs exhibit high ionic conductivity and an enhanced electrochemical reaction window.
  • The QDL-CPEs demonstrate adjustable electrode/electrolyte interphases without additional interfacial resistance.
  • The fabricated LiNi0.8Co0.1Mn0.1O2 (NCM811)//QDL-CPEs//hard carbon full cell showed improved cycling performance at room temperature.
  • The design effectively prevents lithium dendrite formation and enhances antioxidant ability.

Conclusions:

  • The developed QDL-CPEs offer a promising solution for stable lithium-ion battery electrolytes.
  • The unique quasi-double-layer structure effectively addresses simultaneous oxidation and reduction stability challenges.
  • This approach provides a new pathway for designing practical solid-state battery systems with enhanced performance.