Composite Separator Based on a Polyimide Nanofiber Membrane for Advanced Lithium-Ion Batteries
Source abstract
Abstract
High-performance polymeric separators are indispensable materials for advanced rechargeable lithium-ion batteries (LIBs). In general, separators must simultaneously possess the following qualifications: flame retardancy, mechanical strength, wettability, and ion conductivity. In this paper, a siloxanediamine, namely, 1,3-bis(aminopropyl)tetramethyldisiloxane (APTMDS), is introduced as a means of improving the mechanical properties of the pristine polyimide (PI) separator through hydrolysis-cross-linking. Moreover, dopamine (DA) undergoes self-polymerization to form polydopamine (PDA), which adheres to the surface of the composite separator. This process enhances the compatibility of the separator with the electrolyte. The three-layer composite separator of PI/APTMDS/PDA displays superior wettability, fire resistance, and conductivity in comparison to those of a Celgard-2400 separator. In particular, PI/APTMDS/PDA separators display superior battery capability (128.17 mAh·g –1 @5 C, LiFePO 4 IILi) in comparison to polypropylene separators (115.4 mAh·g –1 @5 C, LiFePO 4 IILi). Moreover, the cell employing the PI/APTMDS/PDA separator displays high cycling stability and discharge specific capacity over 100 cycles at 1 and 9 C. The present study offers an excellent design concept for the preparation of modified separators for LIBs.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Technologies Research · Advanced Battery Materials and Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
Funding
National Natural Science Foundation of China
References (34)
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