A functional gel polymer electrolyte based on PVDF-HFP/gelatin toward dendrite-free lithium metal batteries

The leakage of liquid electrolyte and the formation of lithium dendrites pose challenges to safety and stability of lithium metal batteries (LMBs). The appearance of gel polymer electrolyte (GPE) has obviously improved the safety of traditional LMBs. However, the limited inhibition of GPE on lithium...

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Bibliographic Details
Published in:Nano research 2024-04, Vol.17 (4), p.2790-2799
Main Authors: Hu, Xiaoyi, Liu, Kangli, Zhang, Shijie, Shao, Guosheng, Silva, S. Ravi P., Zhang, Peng
Format: Article
Language:English
Subjects:
Anodic protection
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Cathodes
Chemistry and Materials Science
Condensed Matter Physics
Decay rate
Dendrites
Density functional theory
Electrochemistry
Electrolytes
Fire resistance
Gelatin
High temperature
Ion currents
Lithium
Lithium batteries
Lithium compounds
Materials Science
Nanotechnology
Photoelectron spectroscopy
Photoelectrons
Polymers
Research Article
Safety
Sol-gel processes
Vinylidene
Vinylidene fluoride
X ray photoelectron spectroscopy
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Summary:The leakage of liquid electrolyte and the formation of lithium dendrites pose challenges to safety and stability of lithium metal batteries (LMBs). The appearance of gel polymer electrolyte (GPE) has obviously improved the safety of traditional LMBs. However, the limited inhibition of GPE on lithium dendrites is detrimental to the safety of LMBs. Herein, a kind of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/gelatin (GN) GPE with high ionic conductivity, high-temperature resistance, and flame-retardancy, was prepared by electrospinning and soaking method. Utilizing the electrospinning network of PVDF-HFP, its affinity to liquid electrolytes, makes this GPE more beneficial to ions transport and the formation of gel. And, the GN with sol-gel properties, enhances the mechanical property (13.5 MPa) of HFP-GN GPE. Meanwhile, X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) suggest that the attraction of polar groups of GN to Li + can regulate the distribution of Li + and protect Li anodes. Consequently, the application of HFP-GN GPEs to LMBs with cathodes of LiFePO 4 and LiCoO 2 deliver excellent electrochemical performances: after 300 cycles, the LiFePO 4 /HFP-GN GPE/Li battery keeps a low capacity decay rate of 0.09% at 5 C; after 400 cycles at 2 C, the LiCoO 2 /HFP-GN GPE/Li cell retains a high capacity retention of 74%. This GPE is demonstrated for the application prospect of safe LMBs.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-023-6230-0