Novel Li[(CF3SO2)(n-C4F9SO2)N]-Based Polymer Electrolytes for Solid-State Lithium Batteries with Superior Electrochemical Performance

Qiang Ma; Xingguo Qi; Bo Tong; Yuheng Zheng; Wenfang Feng; Jin Nie; Yong-Sheng Hu; Hong Li; Xuejie Huang; Liquan Chen; Zhibin Zhou

doi:10.1021/acsami.6b10597

Novel Li[(CF₃SO₂)(n-C₄F₉SO₂)N]-Based Polymer Electrolytes for Solid-State Lithium Batteries with Superior Electrochemical Performance

ACS Appl Mater Interfaces. 2016 Nov 2;8(43):29705-29712. doi: 10.1021/acsami.6b10597. Epub 2016 Oct 21.

Authors

Qiang Ma^{1

2}, Xingguo Qi¹, Bo Tong², Yuheng Zheng¹, Wenfang Feng², Jin Nie², Yong-Sheng Hu¹, Hong Li¹, Xuejie Huang¹, Liquan Chen¹, Zhibin Zhou²

Affiliations

¹ Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
² Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , Wuhan 430074, China.

PMID: 27726333
DOI: 10.1021/acsami.6b10597

Abstract

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 × 10^-4 S cm^-1 at 60 °C and 3.69 × 10^-4 S cm^-1 at 90 °C) and enough thermal stability (>350 °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)₂N])-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.

Keywords: Li batteries; LiTNFSI; poly(ethylene oxide); polymer electrolytes; solid-state batteries.