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A Silane Cross-Linked Cellulose-Based Separator for Long-Life Lithium Metal Batteries Application
Jinghao Cui1, Hongliang Meng1, Wei Li1
1Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Polymers
|May 14, 2025
Summary
A novel silane-crosslinked propionylated cellulose separator enhances lithium metal battery performance by improving mechanical strength and electrolyte wettability, leading to extended cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Cellulose-based separators are crucial for lithium metal batteries (LMBs) due to their wettability and thermal stability.
- Low mechanical strength of conventional cellulose separators in electrolytes limits LMB cycling performance.
Purpose of the Study:
- To develop a robust cellulose-based separator with enhanced mechanical properties for improved LMB cycling.
- To investigate the effect of silane crosslinking on cellulose separator performance.
Main Methods:
- Preparation of a silane-crosslinked propionylated cellulose separator (PBF-GPTMS).
- Evaluation of mechanical strength (wet strength) and electrolyte uptake.
- Molecular simulation to determine Young's modulus.
- X-ray photoelectron spectroscopy (XPS) to analyze lithium foil.
- Electrochemical cycling tests of assembled Li/Separator/LiFePO4 cells.
Main Results:
- The PBF-GPTMS separator demonstrated high wet strength (18.7 MPa) and electrolyte uptake (312 wt%).
- Molecular simulations showed a significant increase in Young's modulus for silanized cellulose.
- Reduced formation of hydrofluoric acid (HF) was observed on the lithium foil.
- The assembled cell exhibited excellent cycle performance, retaining 94.5% capacity after 300 cycles at 0.5 C.
Conclusions:
- Silane crosslinking effectively enhances the mechanical properties and electrolyte interaction of cellulose separators.
- The PBF-GPTMS separator contributes to stable cycling and reduced side reactions in LMBs.
- This approach offers a promising strategy for designing durable, bio-based separators for high-performance lithium metal batteries.
