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LiFSI and LiDFBOP Dual-Salt Electrolyte Reinforces the Solid Electrolyte Interphase on a Lithium Metal Anode.
ACS Appl Mater Interfaces. 2020 Jul 14 [Online ahead of print]AA

Abstract

Metallic lithium (Li) has great potential as an anode material for high-energy-density batteries due to its high specific capacity. However, the uncontrollable dendritic lithium growth on the metallic lithium surface limits its practical application owing to the instability of the solid electrolyte interphase (SEI). A tailored SEI composition/structure can mitigate or inhibit the lithium dendrites' growth, thereby enhancing the cyclability of the Li-metal anode. In this work, excellent cycling stability of lithium metal anodes was achieved by utilizing a novel dual-salt electrolyte based on lithium bis(fluorosulfonyl) imide (LiFSI) and lithium difluorobis(oxalato) phosphate (LiDFBOP) in carbonate solvents. By combining surface/microstructural characterization and computations, we reveal that the preferential reduction of LiDFBOP occurs prior to LiFSI and carbonate solvents and its reduction products (Li2C2O4 and P-O species) bind to LiF, resulting in a favorable compact and protective SEI on the Li electrodes. It was found that the improved oxidative stability was accompanied by reduced corrosion of the current collector. A Li/Li symmetrical cell with a designed dual-salt electrolyte system exhibits stable polarization voltage over 1000 h of cycle time. In addition, the LiFSI-LiDFBOP advantage of this dual-salt electrolyte system enables the Li/LiFePO4 cells with significantly enhanced cycling stability. This work demonstrates that constructing a tailored SEI using a dual-salt electrolyte system is vital for improving the interfacial stability of lithium metal batteries.

Authors+Show Affiliations

School of Chemistry, South China Normal University, Guangzhou 510006, China.School of Chemistry, South China Normal University, Guangzhou 510006, China.School of Chemistry, South China Normal University, Guangzhou 510006, China.School of Chemistry, South China Normal University, Guangzhou 510006, China. National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES (Ministry of Education), and Key Lab of ETESPG (GHEI), South China Normal University, Guangzhou 510006, China.School of Chemistry, South China Normal University, Guangzhou 510006, China. National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES (Ministry of Education), and Key Lab of ETESPG (GHEI), South China Normal University, Guangzhou 510006, China.Department of Chemistry, University of Rhode Island, Kingston, , Rhode Island 02881, United States.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32608965

Citation

Liu, Si, et al. "LiFSI and LiDFBOP Dual-Salt Electrolyte Reinforces the Solid Electrolyte Interphase On a Lithium Metal Anode." ACS Applied Materials & Interfaces, 2020.
Liu S, Zhang Q, Wang X, et al. LiFSI and LiDFBOP Dual-Salt Electrolyte Reinforces the Solid Electrolyte Interphase on a Lithium Metal Anode. ACS Appl Mater Interfaces. 2020.
Liu, S., Zhang, Q., Wang, X., Xu, M., Li, W., & Lucht, B. L. (2020). LiFSI and LiDFBOP Dual-Salt Electrolyte Reinforces the Solid Electrolyte Interphase on a Lithium Metal Anode. ACS Applied Materials & Interfaces. https://doi.org/10.1021/acsami.0c08094
Liu S, et al. LiFSI and LiDFBOP Dual-Salt Electrolyte Reinforces the Solid Electrolyte Interphase On a Lithium Metal Anode. ACS Appl Mater Interfaces. 2020 Jul 14; PubMed PMID: 32608965.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - LiFSI and LiDFBOP Dual-Salt Electrolyte Reinforces the Solid Electrolyte Interphase on a Lithium Metal Anode. AU - Liu,Si, AU - Zhang,Qiankui, AU - Wang,Xianshu, AU - Xu,Mengqing, AU - Li,Weishan, AU - Lucht,Brett L, Y1 - 2020/07/14/ PY - 2020/7/2/pubmed PY - 2020/7/2/medline PY - 2020/7/2/entrez KW - cycling stability KW - dual-salt electrolyte KW - lithium dendrite suppression KW - lithium metal anode KW - solid electrolyte interphase JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces N2 - Metallic lithium (Li) has great potential as an anode material for high-energy-density batteries due to its high specific capacity. However, the uncontrollable dendritic lithium growth on the metallic lithium surface limits its practical application owing to the instability of the solid electrolyte interphase (SEI). A tailored SEI composition/structure can mitigate or inhibit the lithium dendrites' growth, thereby enhancing the cyclability of the Li-metal anode. In this work, excellent cycling stability of lithium metal anodes was achieved by utilizing a novel dual-salt electrolyte based on lithium bis(fluorosulfonyl) imide (LiFSI) and lithium difluorobis(oxalato) phosphate (LiDFBOP) in carbonate solvents. By combining surface/microstructural characterization and computations, we reveal that the preferential reduction of LiDFBOP occurs prior to LiFSI and carbonate solvents and its reduction products (Li2C2O4 and P-O species) bind to LiF, resulting in a favorable compact and protective SEI on the Li electrodes. It was found that the improved oxidative stability was accompanied by reduced corrosion of the current collector. A Li/Li symmetrical cell with a designed dual-salt electrolyte system exhibits stable polarization voltage over 1000 h of cycle time. In addition, the LiFSI-LiDFBOP advantage of this dual-salt electrolyte system enables the Li/LiFePO4 cells with significantly enhanced cycling stability. This work demonstrates that constructing a tailored SEI using a dual-salt electrolyte system is vital for improving the interfacial stability of lithium metal batteries. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/32608965/A_LiFSI_and_LiDFBOP_Dual-Salt_Electrolyte_Reinforces_the_Solid_Electrolyte_Interphase_on_Lithium_Metal_Anode L2 - https://doi.org/10.1021/acsami.0c08094 DB - PRIME DP - Unbound Medicine ER -
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