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Highly stretchable, non-flammable and notch-insensitive intrinsic self-healing solid-state polymer electrolyte for stable and safe flexible lithium batteries
Solid-state polymer electrolytes (SPEs) with superior self-healing capacity are urgently required for next-generation flexible energy storage devices. Herein, a highly stretchable (extensibility > 4000% and stress > 130 kPa), non-flammable and notch-insensitive intrinsic self-healing solid-sta...
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Published in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-03, Vol.9 (8), p.4758-4769 |
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Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Solid-state polymer electrolytes (SPEs) with superior self-healing capacity are urgently required for next-generation flexible energy storage devices. Herein, a highly stretchable (extensibility > 4000% and stress > 130 kPa), non-flammable and notch-insensitive intrinsic self-healing solid-state polymer electrolyte (SHSPE) was prepared based on the combination of a poly(HFBM-
co
-SBMA) network, imidazole-based ionic liquid (EMI-TFSI) and LiTFSI. The incorporation of the imidazole cation and fluorine atom contributed to the formation of supramolecular bonds (ion-dipole interactions) inside the electrolyte framework, thus endowing SHSPE with prominent self-healing ability (recovery time < 60 min, 25 °C). Moreover, the density functional theory (DFT) calculations indicated that the large electrostatic attraction of SO
3
−
towards Li
+
liberated it from trapping in the ionic reservoir of TFSI
−
and EMI
+
, thereby resulting in a superior
t
Li
+
(0.37). The electrochemical window of SHSPE achieved was 4.9 V
vs.
Li
+
/Li, which well satisfies the demand for safe lithium batteries. The optimized SHSPE3 presented excellent interfacial compatible property with a lithium electrode and record adhesion strength (weight loading > 200 g). The as-assembled Li/SHSPE3/LiFePO
4
battery delivered a high discharge capacity of 144.8 mA h g
−1
at 0.2C, and its capacity retention ratio reached 82% after 100 cycles with a coulombic efficiency of 97%. In particular, the mechanical properties and conductivity of SHSPE3 could fully recover after repeated damage, conferring the derived soft-pack battery excellent anti-fatigue capability. The use of intrinsic self-healing principles in the field of SPEs provides new insight for developing reliable and safe flexible electronic devices.
A highly stretchable (extensibility > 4000% and stress > 130 kPa), adhesive (weight loading > 200 g), non-flammable and notch-insensitive intrinsic self-healing solid-state polymer electrolyte is designed for stable and safe flexible batteries. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/d0ta10745j |