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Regulating Lithium-Ion Transport in PEO-Based Solid-State Electrolytes through Microstructures of Clay Minerals
Wankai Wang1,2, Yanfei Yang1,2, Junping Zhang1,2
1Research Center of Resource Chemistry and Energy Materials, Key Laboratory of Clay Mineral of Gansu, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R. China.
ACS Applied Materials & Interfaces
|January 11, 2025
Summary
Clay minerals enhance polymer composite solid electrolytes for better lithium-ion transport. Laponite nanosheets significantly improve conductivity and battery performance, offering safer, more stable energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Clay minerals are promising fillers for polymer composite solid electrolytes (CSEs).
- Understanding how clay microstructure affects lithium-ion (Li+) transport is crucial but underexplored.
- Poly(ethylene oxide) (PEO) is a common polymer matrix for CSEs.
Purpose of the Study:
- To investigate the impact of diverse clay mineral microstructures on Li+ transport in PEO-based CSEs.
- To identify the optimal clay filler for enhancing CSE properties.
- To evaluate the performance and safety of CSEs in solid-state batteries.
Main Methods:
- Design and synthesis of PEO-based CSEs incorporating 1D halloysite nanotubes, 2D Laponite (Lap) nanosheets, and 3D porous diatomite.
- Characterization of Li+ conductivity, Li+ transference number, and oxidative stability.
- Fabrication and testing of solid-state Li|LiFePO4 batteries and pouch cells.
Main Results:
- 2D Laponite nanosheets demonstrated superior Li+ conductivity (1.67 × 10-4 S cm-1 at 30 °C), Li+ transference number (0.72), and oxidative stability (4.7 V).
- PEO/Lap CSEs enabled high reversible capacity and excellent cycling stability (90.2% retention after 250 cycles) in Li|LiFePO4 batteries.
- Pouch batteries with PEO/Lap CSEs exhibited enhanced safety under extreme conditions.
Conclusions:
- The microstructure of clay fillers significantly influences Li+ transport pathways in PEO-based CSEs.
- 2D Laponite nanosheets are highly effective in optimizing CSE properties for advanced lithium-ion batteries.
- This research offers valuable insights for designing high-performance and safe clay-based CSEs.
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