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Dual functional composite solid electrolyte constructed by double-layer sulfonated polyethersulfone (SPES)/poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofiber membrane in high-performance all-solid-state lithium metal batteries
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DOI：10.1016/j.cej.2024.153448.png)
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Abstract
En 中文
The successful implementation of polymer electrolytes in next -generation all -solid-state lithium metal batteries (ASSLMBs) is impeded by their low ion conductivity and weak resistance to lithium dendrites. Herein, a composite solid electrolyte (D-SPES-PH-PEO) with dual reinforcement effects is obtained by combining PEO matrix with a double -layer sulfonated polyethersulfone (SPES)-poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofiber membrane. The SPES nanofiber membrane acts as a hopping site for ion transport by utilizing the electronegativity and Coulombic force of its own - SO 3 H groups, reducing the energy barrier of the D-SPES-PH-PEO electrolyte. Profiting from the existence of C -F bond, PVDF-HFP nanofiber membrane specializes in generating a protective SEI layer on the lithium anode. Moreover, such a functional membrane not only effectually constructs a three-dimensional ion transport channel by fabricating ion conductive substructures, but also enhances the mechanical strength of the electrolyte. Consequently, the D-SPES-PH-PEO electrolyte is equipped with a high ion conductivity of 7.41 x 10 -5 S cm -1 at 30 degrees C and high tensile strength of 8 MPa. Furthermore, Li/Li symmetric battery incorporating D-SPES-PH-PEO electrolyte enables a stable cycle for 2500 h at 0.2 mAh cm -2 . The D-SPES-PH-PEO electrolyte represents outstanding compatibility with LiFePO 4 and highvoltage LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) electrodes. Especially, the LiFePO 4 /D-SPES-PH-PEO/Li pouch cell indicates an initial specific capacity of 146.7 mAh g -1 and the NMC811/D-SPES-PH-PEO/Li pouch cell reaches a maximum capacity of 178.5 mAh g -1 . This study emphasizes the importance of double reinforcement of ion conduction and anode protection on solid electrolytes.
Keywords:
All -solid-state composite electrolyte
Bilayer substrate
Continuous ion transport path
Anode protection
Pouch cell
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13.2
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7.2W
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48.5W
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