Pyrogallic acid coated polypropylene membranes as separators for lithium-ion batteries

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 o...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2015-01, Vol.3 (41), p.2535-254
Main Authors: Wang, Haibin, Pan, Lei, Wu, Chaolumen, Gao, Dacheng, Chen, Shengyang, Li, Lei
Format: Article
Language:English
Subjects:
Coating
Cycles
Lithium-ion batteries
Polypropylenes
Rechargeable batteries
Separators
Wetting
X-ray photoelectron spectroscopy
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Summary: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. Pyrogallic acid (PA) coated polypropylene (PP) separators for lithium-ion batteries (LIBs) are developed. The PA coating makes the PP surfaces hydrophilic and thus improves LIB performance including specific capacity, cycling stability and power capability compared to the original PP separators.
ISSN:2050-7488
2050-7496
DOI:10.1039/c5ta06381g