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Tris(2,4,6-trimethylphenyl) phosphine with Aluminum Oxide Incorporated Polyethylene Separator for Lithium-Ion Batteries
Bulletin of the Korean Chemical Society ( IF 1.7 ) Pub Date : 2021-07-14 , DOI: 10.1002/bkcs.12357
Seong Ho Oh 1 , Giseung Lee 1 , Taeeun Yim 1
Affiliation  

Radical-scavenging Al2O3-tris(2,4,6-trimethylphenyl) phosphine (TMPP)-functionalized polyethylene (PE) separator is modified by preparation of the Al2O3-TMPP composites and embedding them onto the PE separator by dip-coating process. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy analyses indicate that Al2O3-TMPP is well coated onto the PE separator. The Al2O3-TMPP-embedded PE separator exhibits a lower contact angle and higher electrolyte uptake than the bare PE separator, indicating a more hydrophilic surface is developed in the Al2O3-TMPP-embedded PE separator. The cell cycled with the Al2O3-TMPP-embedded PE separator exhibits stable cycling behavior after 150 cycles at high temperature (59.8%) while the cell cycled with a bare PE separator shows a continuous decrease in cycling retention (47.1%). The use of the Al2O3-TMPP-embedded PE separator is therefore an effective way to improve the cell cycling retention because it can effectively lower the radical concentration via a chemical scavenging process.

中文翻译:

锂离子电池用三(2,4,6-三甲基苯基)膦和氧化铝掺入聚乙烯隔膜

通过制备Al 2 O 3 -TMPP复合材料并将其嵌入PE隔膜上,对自由基清除Al 2 O 3 -三(2,4,6-三甲基苯基)膦(TMPP)-功能化聚乙烯(PE)隔膜进行改性浸涂工艺。扫描电子显微镜、能量色散 X 射线光谱、X 射线衍射和傅立叶变换红外光谱分析表明,Al 2 O 3 -TMPP 很好地涂覆在 PE 隔膜上。与裸 PE 隔膜相比,Al 2 O 3 -TMPP 嵌入的 PE 隔膜具有更低的接触角和更高的电解质吸收率,表明在 Al 2 中形成了更亲水的表面O 3 -TMPP 嵌入式 PE 隔板。使用 Al 2 O 3 -TMPP 嵌入的 PE 隔膜循环的电池在高温下循环 150 次后表现出稳定的循环行为 (59.8%),而使用裸 PE 隔膜循环的电池显示循环保持率持续下降 (47.1%)。因此,使用嵌入Al 2 O 3 -TMPP 的 PE 隔膜是提高电池循环保留率的有效方法,因为它可以通过化学清除过程有效降低自由基浓度。
更新日期:2021-07-14
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