Effect of a Polypropylene Separator with a Thin Electrospun Ceramic/Polymer Coating on the Thermal and Electrochemical Properties of Lithium-Ion Batteries

Lithium-ion batteries (LIBs) are well known for their energy efficiency and environmental benefits. However, increasing their energy density compromises their safety. This study introduces a novel ceramic-coated separator to enhance the performance and safety of LIBs. Electrospinning was used to app...

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Bibliographic Details
Published in:	Polymers Vol. 16; no. 18; p. 2627
Main Authors:	Hwang, Yeongsu, Kim, Minjae
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 17-09-2024 MDPI
Subjects:	Aluminum oxide Automobiles, Electric Batteries ceramic coated separator Ceramic coatings Ceramics Chemical properties Coating effects Electric vehicles Electrochemical analysis Electrodes Electrolytes Electronic cameras Electrospinning Energy storage Heat resistance ionic conductivity Lithium Lithium-ion batteries lithium-ion battery safety Manufacturing Mechanical properties Open circuit voltage Polyacrylic acid polymer binder Polymer coatings Polymers Polyolefins Polypropylene Polyvinyl alcohol Separators thermal stability wettability France South Korea Japan ionic conductivity electrospinning polymer binder ceramic coated separator wettability thermal stability lithium-ion battery safety
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Summary:	Lithium-ion batteries (LIBs) are well known for their energy efficiency and environmental benefits. However, increasing their energy density compromises their safety. This study introduces a novel ceramic-coated separator to enhance the performance and safety of LIBs. Electrospinning was used to apply a coating consisting of an alumina (Al O ) ceramic and polyacrylic acid (PAA) binder to a polypropylene (PP) separator to significantly improve the mechanical properties of the PP separator and, ultimately, the electrochemical properties of the battery cell. Tests with 2032-coin cells showed that the efficiency of cells containing separators coated with 0.5 g PAA/Al O was approximately 10.2% higher at high current rates (C-rates) compared to cells with the bare PP separator. Open circuit voltage (OCV) tests revealed superior thermal safety, with bare PP separators maintaining stability for 453 s, whereas the cells equipped with PP separators coated with 4 g PAA/Al O remained stable for 937 s. The elongation increased from 88.3% (bare PP separator) to 129.1% (PP separator coated with 4 g PAA/Al O ), and thermal shrinkage decreased from 58.2% to 34.9%. These findings suggest that ceramic/PAA-coated separators significantly contribute to enhancing the thermal safety and capacity retention of high-energy-density LIBs.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2073-4360 2073-4360
DOI:	10.3390/polym16182627