用于高安全性锂离子电池的新型 Al2O3/聚乙烯吡咯烷酮涂层聚乙烯隔膜

IF 8.1 2区 工程技术 Q1 CHEMISTRY, PHYSICAL Journal of Power Sources Pub Date : 2024-06-28 DOI:10.1016/j.jpowsour.2024.234964
Siya Cheng , Rui Deng , Zhi Zhang , Qingwen He , Yifan Zheng , Huanyi Liao , Xiutao Fu , Jianing Lu , Yumeng Jiang , Yihua Gao
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引用次数: 0

摘要

本研究设计了一种新型陶瓷-聚乙烯(PE)复合隔膜,并通过非常简便的制备策略实现了高安全性锂离子电池(LIB)。在聚乙烯隔膜的一侧涂覆由 Al2O3 和聚乙烯吡咯烷酮(PVP)组成的优化陶瓷浆料,以经济高效的方式形成新型 Al2O3/PVP-PE 隔膜。研究发现,优良的 PVP 粘合剂可提高耐热 Al2O3 陶瓷粉末在聚乙烯基底上的附着力,从而显著提高优化隔膜的热稳定性。经 30 分钟热处理后,Al2O3/PVP-PE 分离器在 180 °C 高温下的收缩率可忽略不计。此外,制备的 Al2O3/PVP-PE 分离器与电解质的润湿性极佳,孔隙率大,储液能力强,这对离子导电性和电荷存储动力学非常有利。此外,使用优化的 Al2O3/PVP-PE 隔离层组装的 LIB(LiFePO4/石墨)比使用裸 PE 隔离层组装的 LIB 显示出更优越的电化学性能。这项研究为新型 Al2O3/PVP-PE 分离器的实际应用和商业化提供了启示,这种分离器可用于电化学性能更高的高安全性锂离子电池。
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A novel Al2O3/polyvinyl pyrrolidone-coated polyethylene separator for high-safety lithium-ion batteries

In this study, a novel ceramic-polyethylene (PE) composite separator is designed and achieved by a very facile preparation strategy for high-safety lithium-ion batteries (LIBs). The optimized ceramic slurry composed of Al2O3 and polyvinyl pyrrolidone (PVP) is coated on one side of PE separator in an economically efficient way to form the novel Al2O3/PVP-PE separator. It is found that the superior PVP binder can improve the adherence of heat-resistant Al2O3 ceramic powders on the PE substrate, which significantly enhances the thermal stability of the optimized separator. The Al2O3/PVP-PE separator shows negligible shrinkage at a high temperature of 180 °C after 30 min thermal treatment. In addition, the prepared Al2O3/PVP-PE separator shows excellent wettability with electrolyte, large porosity and high liquid storage capacity, which are quite beneficial to the ionic conductivity and charge storage kinetics. Furthermore, LIBs (LiFePO4/graphite) assembled with the optimized Al2O3/PVP-PE separator shows superior electrochemical performance than LIBs assembled with bare PE separator. This study provides insight into the practical application and commercialization of novel Al2O3/PVP-PE separator for high-safety LIBs with improved electrochemical performance.

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来源期刊
Journal of Power Sources
Journal of Power Sources 工程技术-电化学
CiteScore
16.40
自引率
6.50%
发文量
1249
审稿时长
36 days
期刊介绍: The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells. Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include: • Portable electronics • Electric and Hybrid Electric Vehicles • Uninterruptible Power Supply (UPS) systems • Storage of renewable energy • Satellites and deep space probes • Boats and ships, drones and aircrafts • Wearable energy storage systems
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