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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Phase-Transition-Promoted Interfacial Anchoring of Sulfide Solid Electrolyte Membranes for High-Performance
Zhengkang Su1, Qinzhe Zhou2, Junhong Jin1
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 22, 2024
Summary
A novel "solid-to-liquid" phase transition strategy creates flexible sulfide electrolytes for solid-state lithium batteries. This approach enhances ion transport and interfacial stability, significantly extending battery life and enabling safer, high-energy-density devices.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solvent-free manufacturing is essential for scalable, high-performance sulfide-electrolyte all-solid-state lithium batteries (ASSLBs).
- Existing sulfide electrolytes often exhibit brittleness and poor interfacial stability due to particle dispersion issues in polymer binders.
- Achieving efficient ion transport and stable interfaces remains a key challenge for ASSLB development.
Purpose of the Study:
- To develop a flexible and stable sulfide electrolyte for ASSLBs using a novel fabrication strategy.
- To improve ion conductivity and interfacial properties of Li6PS5Cl (LPSCl) electrolytes.
- To demonstrate the potential for dendrite-free ASSLBs with enhanced energy density.
Main Methods:
- A "solid-to-liquid" phase transition strategy was employed to fabricate flexible Li6PS5Cl (LPSCl) electrolytes.
- Polycaprolactone (PCL)-based binder (PLI) with phase-transition characteristics was used to fill gaps and graft onto LPSCl particles via ion-dipole interaction.
- Fabrication of thin (80 µm) electrolyte membranes with high Li-ion conductivity and electron insulation.
Main Results:
- The flexible LPSCl electrolyte membrane achieved a high ionic conductivity of 8.5 × 10⁻⁴ S cm⁻¹.
- Symmetric and full cells demonstrated significantly improved cycling life (10x and 2.5x longer, respectively) compared to pristine LPSCl electrolytes.
- The PLI binder ensured good interfacial stability between the electrolyte and anode, facilitating Li-ion transport.
Conclusions:
- The "solid-to-liquid" phase transition strategy successfully produced flexible and stable sulfide electrolytes for ASSLBs.
- The developed electrolytes exhibit enhanced ionic conductivity and interfacial properties, leading to improved battery performance and longevity.
- This versatile strategy, extendable to other binders like EVA, offers a promising pathway towards high-energy-density, dendrite-free ASSLBs.
