Novel Concentrated Li[(FSO2)(n-C4F9SO2)N]-Based Ether Electrolyte for Superior Stability of Metallic Lithium Anode

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• 作者：Zheng Fang ; Qiang Ma ; Pin Liu ; Jie Ma ; Yong-Sheng Hu ; Zhibin Zhou ; Hong Li ; Xuejie Huang ; Liquan Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：9
• 期：5
• 页码：4282-4289
• 全文大小：576K
• ISSN：1944-8252

文摘

Lithium (fluorosulfonyl)(n-nonafluorobutanesulfonyl)imide [Li[(FSO₂)(n-C₄F₉SO₂)N] (LiFNFSI)] is investigated as a conducting salt, which can form a relatively stable solid-electrolyte-interphase film in concentrated ether electrolyte to achieve favorable protection for lithium metal anodes. Li|Cu and Li|Li cells with concentrated LiFNFSI-based electrolyte have been demonstrated to display high average Coulombic efficiency (≈97%) and excellent cycling stability (over 1,000 h) of metallic lithium anodes, compared to concentrated lithium bis(trifluoromethanesulfonyl)imide [Li[N(SO₂CF₃)₂] (LiTFSI)]-based electrolyte. The morphologies and compositions of the lithium–metal anode surface are also comparatively analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. Moreover, superior electrochemical performance in the concentrated LiFNFSI-based electrolyte for Li|LiFePO₄ cells is also presented herein. These results indicate that concentrated LiFNFSI-based electrolyte is a promising candidate for metallic lithium rechargeable batteries.