Related Experiment Video
Updated: Sep 22, 2025
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
21.8K
Self-Healable, Highly Stretchable, Ionic Conducting Polymers as Efficient Protecting Layers for Stable Lithium-Metal
Feiyuan Sun1, Zhenxi Li1, Shilun Gao1
1Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
ACS Applied Materials & Interfaces
|May 24, 2022
Summary
A new self-healing polymer protects lithium-metal batteries, enabling stable operation at low temperatures. This breakthrough enhances battery longevity and performance, crucial for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Stabilizing lithium (Li)-metal electrodes is critical for Li-metal batteries (LMBs).
- Existing polymeric protective films often lack self-healing capabilities for long-term, low-temperature operation.
- Developing robust protective layers for Li-metal anodes remains a significant challenge.
Purpose of the Study:
- To synthesize a self-healing polymer network for stabilizing Li-metal electrodes in LMBs.
- To investigate the low-temperature self-healability and ionic conductivity of the polymer.
- To evaluate the electrochemical performance and interfacial stability of LMBs protected by the polymer.
Main Methods:
- Synthesis of a self-healing, ionic-conducting polymer network (SHIPN) via copolymerization and chemical cross-linking.
- Fabrication of SHIPN-modified electrodes for Li/Cu, Li/Li, and Li/LiFePO4 (Li/LFP) cells.
- Electrochemical testing, including cycling stability at 5 °C and performance evaluation in full cells with high-mass-loading cathodes.
- Physical characterization of electrode interfaces to confirm interfacial stability and dendrite suppression.
Main Results:
- SHIPN exhibits high stretchability, autonomous self-healability, and ionic conductivity.
- SHIPN-modified electrodes demonstrate enhanced electrochemical performance in various Li-metal cell configurations.
- The SHIPN@Li/LFP cell maintained 85.6% capacity retention after 500 cycles at 5 °C, showcasing low-temperature self-healability.
- Full cells with SHIPN protection showed over 300% higher capacity retention compared to bare Li electrodes, especially with high-mass-loading LFP cathodes.
- Characterization confirmed improved interfacial stability and suppressed Li dendrite growth.
Conclusions:
- The synthesized SHIPN is an effective protective film for stabilizing Li-metal electrodes in LMBs.
- The low-temperature self-healability of SHIPN is key to achieving long-term stable cycling at 5 °C.
- SHIPN significantly enhances interfacial stability, suppresses dendrite growth, and improves overall battery performance.
- This work provides a foundation for designing advanced soft and hybrid materials for stable LMBs across various operating temperatures.
