Journal article
In Situ Armoring: A Robust, High-Wettability, and Fire-Resistant Hybrid Separator for Advanced and Safe Batteries
ACS applied materials & interfaces, Vol.11(3), pp.2978-2988
01/23/2019
Handle:
https://hdl.handle.net/2376/109020
PMID: 30543417
Abstract
Development of nonflammable separators with excellent properties is in urgent need by next-generation advanced and safe energy storage devices. However, it has been extremely challenging to simultaneously achieve fire resistance, high mechanical strength, good thermomechanical stability, and low ion-transport resistance for polymeric separators. Herein, to address all these needs, we report an in situ formed silica@silica-imbedded polyimide (in situ SiO2@(PI/SiO2)) nanofabric as a new high-performance inorganic–organic hybrid separator. Different from conventional ceramics-modified separators, this in situ SiO2@(PI/SiO2) hybrid separator is realized for the first time via an inverse in situ hydrolysis process. Benefiting from the in situ formed silica nanoshell, the in situ SiO2@(PI/SiO2) hybrid separator shows the highest tensile strength of 42 MPa among all reported nanofiber-based separators, excellent wettability to the electrolyte, good thermomechanical stability at 300 °C, and fire resistance. The LiFePO4 half-cell assembled with this hybrid separator showed a high capacity of 139 mAh·g–1@5C, which is much higher than that of the battery with the pristine PI separator (126.2 mAh·g–1@5C) and Celgard-2400 separator (95.1 mAh·g–1@5C). More importantly, the battery showed excellent cycling stability with no capacity decay over 100 cycles at the high temperature of 120 °C. This study provides a novel method for the fabrication of high-performance and nonflammable polymeric–inorganic hybrid battery separators.
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Details
- Title
- In Situ Armoring: A Robust, High-Wettability, and Fire-Resistant Hybrid Separator for Advanced and Safe Batteries
- Creators
- Lushi Kong - State Key Laboratory of Chemical Resource EngineeringYu Wang - School of Mechanical and Materials EngineeringHongsheng Yu - State Key Laboratory of Chemical Resource EngineeringBingXue Liu - China Automotive Battery Research InstituteShengli Qi - State Key Laboratory of Chemical Resource EngineeringDezhen Wu - Beijing University of Chemical TechnologyWei-Hong Zhong - School of Mechanical and Materials EngineeringGuofeng Tian - State Key Laboratory of Chemical Resource EngineeringJie Wang - Beijing University of Chemical Technology
- Publication Details
- ACS applied materials & interfaces, Vol.11(3), pp.2978-2988
- Academic Unit
- School of Mechanical and Materials Engineering; School of Chemical Engineering and Bioengineering
- Publisher
- American Chemical Society
- Identifiers
- 99900547274001842
- Language
- English
- Resource Type
- Journal article