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Integrated Design for Regulating the Interface of a Solid-State Lithium-Oxygen Battery with an Improved
Hao Ouyang1, Shan Min2, Jin Yi2
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
ACS Applied Materials & Interfaces
|November 22, 2022
Summary
A new composite solid-state electrolyte (SSE) enhances lithium-oxygen (Li-O2) battery safety and performance. This solvent-free SSE enables stable cycling and inhibits anode degradation, paving the way for advanced battery technologies.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Solid-state electrolytes (SSEs) are crucial for developing safer, high-performance lithium-oxygen (Li-O2) batteries.
- Existing SSEs often face challenges with safety, durability, and electrochemical performance.
- Addressing these limitations is key to unlocking the potential of Li-O2 battery technology.
Purpose of the Study:
- To develop a solvent-free composite SSE for improved Li-O2 battery safety and electrochemical performance.
- To investigate the efficacy of a novel composite SSE in inhibiting anode degradation and optimizing electrode interfaces.
- To demonstrate the stable cycling performance of an integrated solid-state Li-O2 battery.
Main Methods:
- Preparation of a solvent-free composite SSE via thermal initiation of poly(ethylene glycol) diacrylate radical polymerization.
- Assembly of an integrated solid-state Li-O2 battery using a simple heat treatment process.
- Electrochemical characterization of Li-metal symmetric cells and integrated solid-state Li-O2 batteries, including cycling tests and critical current density measurements.
Main Results:
- The composite SSE demonstrated a critical current density of 0.8 mA cm-2 in Li-metal symmetric cells.
- Stable cycling exceeding 900 hours at 0.2 mA cm-2 was achieved in Li-metal symmetric cells.
- The integrated solid-state Li-O2 battery exhibited stable cycling for 118 cycles at 500 mA g-1 at room temperature.
- The SSE effectively suppressed O2 erosion on the Li metal anode and optimized the electrolyte-cathode interface.
Conclusions:
- The developed solvent-free composite SSE offers enhanced safety and durability for Li-O2 batteries.
- This SSE design optimizes interfacial properties and provides reaction sites, leading to improved electrochemical performance.
- The integrated solid-state Li-O2 battery demonstrates promising application prospects for next-generation energy storage solutions.
