Pyrogallic acid coated polypropylene membranes as separators for lithium-ion batteries
Pyrogallic acid coated polypropylene membranes as separators for lithium-ion batteries
复制标题
焦没食子酸涂层聚丙烯膜作为锂离子电池隔膜
DOI：
10.1039/c5ta06381g
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Li, Lei
中科院分区：
文献类型：
--
作者：
Wang, Haibin;Pan, Lei;Li, Lei
为解决锂离子电池用聚丙烯隔膜的润湿性问题，开发了一种简单、新颖的浸渍表面涂覆方法。在该方法中，焦性没食子酸（PA）被用作唯一的涂层前体，并且PA涂层在PP隔板表面上自发地形成。衰减全反射红外光谱（ATR-IR）和X射线光电子能谱（XPS）测试表明，PA已成功地包覆在PP隔膜表面。PA涂层使PP表面亲水，而隔膜的微孔结构保持完整。通过使用这些PA涂覆的PP隔膜，由于其更好的润湿能力、更高的电解质吸收和离子电导率，获得了改善的LIB性能，包括放电比容量、循环性能和倍率性能。XPS测试表明，PA涂层在LIB循环测试后显示出良好的稳定性和对PP隔膜的强粘附性。本研究提供了一种有效且廉价的方法来实现用于LIB应用的商业聚烯烃隔膜的亲水改性，并且具有潜在的应用以解决其他膜的类似表面性质问题。
To solve the wetting capability issue of commercial polypropylene (PP) separators for lithium-ion batteries (LIBs), we developed a simple and new dipping surface coating method. In this method, pyrogallic acid (PA) is used as the sole coating precursor, and the PA coatings are formed spontaneously on the PP separator surfaces. Attenuated total reflection-infrared (ATR-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements show that PA has been successfully coated on the surface of the PP separator. The PA coatings make the PP surfaces hydrophilic, while the micro-porous structure of the separators remains intact. The improved LIB performance including discharge specific capacity, cycling performance and rate capability is obtained by using these PA coated PP separators due to their better wetting capability, higher electrolyte uptake and ionic conductivity. XPS measurements indicate that the PA coatings show good stability and strong adhesion to the PP separators after the cycling test in LIBs. This study provides an effective and cheap way to achieve hydrophilic modification of commercial polyolefin separators for LIB applications, and has potential application to solve similar surface property issues of other membranes.