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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Constructing the Polymer Molecules to Regulate the Electrode/Electrolyte Interface to Enhance Lithium-Metal Battery
Hui Chen1, Yu-Xiang Xie1, Long-Ji Dong1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, 361005, China.
Chemsuschem
|February 26, 2024
Summary
A novel polymer bifunctional electrolyte additive, PMANHF, enhances lithium-ion battery performance by forming stable interfaces. This improves lithium metal anode deposition and NCM811 cathode stability for longer cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Chemistry
Background:
- Lithium-ion batteries are crucial for electronics and vehicles but need improved energy density, safety, and cycle life.
- Existing single-functional group electrolyte additives have practical limitations.
- Advanced electrolyte additives are essential for next-generation lithium-metal batteries.
Purpose of the Study:
- To synthesize and evaluate a novel ternary polymer bifunctional electrolyte additive, PMANHF.
- To investigate the effect of PMANHF on the solid electrolyte interphase (SEI) layer formation at Li metal anodes.
- To assess the performance enhancement of PMANHF in Li/NCM811 batteries.
Main Methods:
- Free radical polymerization was used to synthesize the PMANHF copolymer.
- Electrochemical characterizations, including cycling tests, were performed on Li/Li and Li/NCM811 cells.
- Surface analysis techniques were employed to study the interface layers formed.
Main Results:
- PMANHF preferentially reduces at Li metal anodes, forming a uniform and stable SEI layer with dense Li deposition.
- A LiF- and Li3N-rich film forms at the NCM811 cathode interface, suppressing side reactions.
- The Li/Li cell achieved 1000 cycles at 1.0 mA cm⁻², and the Li/NCM811 cell stabilized for 200 cycles with 89.93% capacity retention.
Conclusions:
- The synthesized PMANHF effectively improves the stability and cycle life of lithium-metal batteries.
- PMANHF demonstrates significant potential as a bifunctional electrolyte additive for high-performance batteries.
- This study provides valuable insights for designing advanced additives for lithium-metal battery applications.
