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Updated: Jul 26, 2026
05:33
Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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Functionalized γ-Boehmite Covalent Grafting Modified Polyethylene for Lithium-Ion Battery Separator
Yuanxin Man1, Hui Nan1, Jianzhe Ma1
1Qinghai Provincial Key Laboratory of New Light Alloys, School of Mechanical Engineering, Qinghai University, Xining 810016, China.
Materials (Basel, Switzerland)
|May 11, 2024
Summary
This study developed a stable ceramic-coated separator for lithium-ion batteries using boehmite/polydopamine/polyethylene. Covalent bonding enhances electrolyte infiltration and lithium-ion diffusion, improving battery performance and cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Conventional polyolefin separators in lithium-ion batteries suffer from low melting points and poor electrolyte wettability.
- Ceramic-coated separators are gaining attention to overcome these limitations.
Purpose of the Study:
- To develop a highly efficient and stable ceramic-coated separator for lithium-ion batteries.
- To investigate the impact of covalent interface modification on separator performance.
Main Methods:
- Synthesized a boehmite/polydopamine/polyethylene (AlOOH-PDA-PE) separator by covalently attaching nanosized boehmite (γ-AlOOH) whiskers onto polyethylene (PE) surfaces.
- Incorporated polydopamine (PDA) for enhanced interfacial properties.
Main Results:
- The AlOOH-PDA-PE separator demonstrated enhanced electrolyte infiltration and lithium-ion diffusion due to surface amino groups.
- Achieved a discharge capacity of 126 mAh g-1 at 5 C in lithium-ion batteries.
- Exhibited superior cycling stability, retaining 97.1% capacity after 400 cycles.
Conclusions:
- Covalent interface modification is a promising strategy to prevent ceramic coating delamination in battery separators.
- The developed AlOOH-PDA-PE separator offers improved stability and performance for lithium-ion batteries.
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