Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 43, Pages 29705-29712Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10597
Keywords
poly(ethylene oxide); LiTNFSI; polymer electrolytes; solid-state batteries; Li batteries
Funding
- National Natural Science Foundation of China [51222210, 51472268, 51172083]
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Solid polymer electrolytes (SPEs) would be promising candidates for application in high-energy rechargeable lithium (Li) batteries to replace the conventional organic liquid electrolytes, in terms of the enhanced safety and excellent design flexibility. Herein, we first report novel perfluorinated sulfonimide salt-based SPEs, composed of lithium (trifluoromethanesulfonyl)(n-nonafluorobutanesulfonyl)imide (Li[(CF3SO2)(n-C4F9SO2)N], LiTNFSI) and poly(ethylene oxide) (PEO), which exhibit relatively efficient ionic conductivity (e.g., 1.04 x 10(-4) S cm(-1) at 60 degrees C and 3.69 x 10(-4) S cm(-1) at 90 degrees C) and enough thermal stability (>350 degrees C), for rechargeable Li batteries. More importantly, the LiTNFSI-based SPEs could not only deliver the excellent interfacial compatibility with electrodes (e.g., Li-metal anode, LiFePO4 and sulfur composite cathodes), but also afford good cycling performances for the Li|LiFePO4 (>300 cycles at 1C) and Li-S cells (>500 cycles at 0.5C), in comparison with the conventional LiTFSI (Li[(CF3SO2)(2)N])-based SPEs. The interfacial impedance and morphology of the cycled Li-metal electrodes are also comparatively analyzed by electrochemical impedance spectra and scanning electron microscopy, respectively. These indicate that the LiTNFSI-based SPEs would be potential alternatives for application in high-energy solid-state Li batteries.
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