Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes
The use of poly(ethylene oxide) (PEO)-based solid-state electrolytes have shown potential to improve both the energy density and safety performance of lithium-metal batteries. However, these electrolytes often form unstable interfaces with lithium metal anodes, compromising the durability and sustai...
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Elsevier
2025-08-01
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| Series: | Electrochemistry Communications |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1388248125001183 |
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| author | Yi-Min Wei An Qiu Jingchao Wang Yu Gu Jian-Feng Li |
| author_facet | Yi-Min Wei An Qiu Jingchao Wang Yu Gu Jian-Feng Li |
| author_sort | Yi-Min Wei |
| collection | DOAJ |
| description | The use of poly(ethylene oxide) (PEO)-based solid-state electrolytes have shown potential to improve both the energy density and safety performance of lithium-metal batteries. However, these electrolytes often form unstable interfaces with lithium metal anodes, compromising the durability and sustained performance of solid-state lithium-metal batteries. In this study, three lithium salts, lithium (fluorosulfonyl) (trifluoromethanesulfonyl)imide (LiFTFSI), lithium bis(fluorosulfonyl)imide (LiFSI), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), were each mixed in equimolar ratios with tetraethylene glycol dimethyl ether (G4) and introduced as a conductivity enhancer in PEO-based solid-state electrolytes. The effects of the lithium salt anions on the electrolyte properties were systematically investigated. Among the three, the fluorosulfonyl group was found to enhance ionic conductivity, while the trifluoromethanesulfonyl group improved thermal stability. Notably, the synergistic interaction between these two groups in LiFTFSI led to the formation of a stable solid-electrolyte interphase (SEI), characterized by a higher content of inorganic species and reduced organic components. As a result, LiFTFSI/G4-based solid-state electrolytes enabled stable cycling for 200 cycles at a 0.5C rate in LiFePO4-based solid-state lithium-metal batteries, achieving a capacity retention of 91 %. This study provides valuable insights into the optimization of high-efficiency solid-state lithium-metal batteries by elucidating the distinct roles of lithium salt anions. |
| format | Article |
| id | doaj-art-37b4bd60ced74f7b887231146cc7ea40 |
| institution | Kabale University |
| issn | 1388-2481 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Electrochemistry Communications |
| spelling | doaj-art-37b4bd60ced74f7b887231146cc7ea402025-08-20T03:35:43ZengElsevierElectrochemistry Communications1388-24812025-08-0117710797910.1016/j.elecom.2025.107979Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytesYi-Min Wei0An Qiu1Jingchao Wang2Yu Gu3Jian-Feng Li421C Innovation Laboratory, Contemporary Amperex Technology Co. Limited, Ningde 352100, ChinaCollege of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Energy, Xiamen University, Xiamen 361005, China21C Innovation Laboratory, Contemporary Amperex Technology Co. Limited, Ningde 352100, China; Corresponding authors.College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Energy, Xiamen University, Xiamen 361005, China; Corresponding authors.College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Energy, Xiamen University, Xiamen 361005, China; Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361005, China; Corresponding author at: College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Energy, Xiamen University, Xiamen 361005, China.The use of poly(ethylene oxide) (PEO)-based solid-state electrolytes have shown potential to improve both the energy density and safety performance of lithium-metal batteries. However, these electrolytes often form unstable interfaces with lithium metal anodes, compromising the durability and sustained performance of solid-state lithium-metal batteries. In this study, three lithium salts, lithium (fluorosulfonyl) (trifluoromethanesulfonyl)imide (LiFTFSI), lithium bis(fluorosulfonyl)imide (LiFSI), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), were each mixed in equimolar ratios with tetraethylene glycol dimethyl ether (G4) and introduced as a conductivity enhancer in PEO-based solid-state electrolytes. The effects of the lithium salt anions on the electrolyte properties were systematically investigated. Among the three, the fluorosulfonyl group was found to enhance ionic conductivity, while the trifluoromethanesulfonyl group improved thermal stability. Notably, the synergistic interaction between these two groups in LiFTFSI led to the formation of a stable solid-electrolyte interphase (SEI), characterized by a higher content of inorganic species and reduced organic components. As a result, LiFTFSI/G4-based solid-state electrolytes enabled stable cycling for 200 cycles at a 0.5C rate in LiFePO4-based solid-state lithium-metal batteries, achieving a capacity retention of 91 %. This study provides valuable insights into the optimization of high-efficiency solid-state lithium-metal batteries by elucidating the distinct roles of lithium salt anions.http://www.sciencedirect.com/science/article/pii/S1388248125001183Solid-state lithium metal batteriesPEO-based solid-state electrolytesLithium salt anions |
| spellingShingle | Yi-Min Wei An Qiu Jingchao Wang Yu Gu Jian-Feng Li Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes Electrochemistry Communications Solid-state lithium metal batteries PEO-based solid-state electrolytes Lithium salt anions |
| title | Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes |
| title_full | Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes |
| title_fullStr | Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes |
| title_full_unstemmed | Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes |
| title_short | Influence of lithium salt anions on the interfacial properties of PEO-based solid-state electrolytes |
| title_sort | influence of lithium salt anions on the interfacial properties of peo based solid state electrolytes |
| topic | Solid-state lithium metal batteries PEO-based solid-state electrolytes Lithium salt anions |
| url | http://www.sciencedirect.com/science/article/pii/S1388248125001183 |
| work_keys_str_mv | AT yiminwei influenceoflithiumsaltanionsontheinterfacialpropertiesofpeobasedsolidstateelectrolytes AT anqiu influenceoflithiumsaltanionsontheinterfacialpropertiesofpeobasedsolidstateelectrolytes AT jingchaowang influenceoflithiumsaltanionsontheinterfacialpropertiesofpeobasedsolidstateelectrolytes AT yugu influenceoflithiumsaltanionsontheinterfacialpropertiesofpeobasedsolidstateelectrolytes AT jianfengli influenceoflithiumsaltanionsontheinterfacialpropertiesofpeobasedsolidstateelectrolytes |