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Title: Effects of Imide-Orthoborate Dual-Salt Mixtures in Organic Carbonate Electrolytes on the Stability of Lithium Metal Batteries

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [2];  [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Southwest Petroleum Univ., Sichuan (China)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Beijing Univ. of Chemical Technology, Beijing (China)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Xiamen Univ., Fujian (China)
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In this study, the effects of lithium imide and lithium orthoborate dual-salt electrolytes of different salt chemistries in carbonate solvents on the cycling stability of lithium (Li) metal batteries are systematically and comparatively investigated. Two imide salts (LiTFSI and LiFSI) and two orthoborate salts (LiBOB and LiDFOB) are chosen for this study and compared with the conventional LiPF6 salt. Density functional theory calculations indicate that the chemical and electrochemical stabilities follow the order of LiTFSI-LiBOB > LiTFSI-LiDFOB > LiFSI-LiDFOB > LiFSI-LiBOB. The experimental cycling stability of the Li metal batteries with the electrolytes follows the order as LiTFSI-LiBOB > LiTFSI-LiDFOB > LiFSI-LiDFOB > LiPF6 > LiFSI-LiBOB, which is in well accordance with the calculation results. The LiTFSI-LiBOB can effectively protect the Al substrate and form a more robust surface film on Li metal anode, while the LiFSI-LiBOB results in serious corrosion to the stainless steel cell case and a thicker and looser surface film on Li anode. In conclusion, the key findings of this work emphasize that the salt chemistry is critically important for enhancing the interfacial stability of Li metal anode and should be carefully manipulated in the development of high performance Li metal batteries.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830
OSTI ID:
1414952
Alternate ID(s):
OSTI ID: 1415141
Report Number(s):
PNNL-SA-128903; TRN: US1800750
Journal Information:
ACS Applied Materials and Interfaces, Vol. 10, Issue 3; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Cited By (12)

A self-healing interface on lithium metal with lithium difluoro (bisoxalato) phosphate for enhanced lithium electrochemistry journal January 2019
Using Triethyl Phosphate to Increase the Solubility of LiNO 3 in Carbonate Electrolytes for Improving the Performance of the Lithium Metal Anode journal January 2019
Adiponitrile (C 6 H 8 N 2 ): A New Bi‐Functional Additive for High‐Performance Li‐Metal Batteries journal May 2019
A Dual-Salt Gel Polymer Electrolyte with 3D Cross-Linked Polymer Network for Dendrite-Free Lithium Metal Batteries journal July 2018
Extending the Service Life of High-Ni Layered Oxides by Tuning the Electrode-Electrolyte Interphase journal September 2018
Stable cycling of high-voltage lithium metal batteries in ether electrolytes journal July 2018
Formulierung von Elektrolyten mit gemischten Lithiumsalzen für Lithium‐Batterien journal December 2019
Formulation of Blended‐Lithium‐Salt Electrolytes for Lithium Batteries journal December 2019
Nonflammable quasi-solid-state electrolyte for stable lithium-metal batteries journal January 2019
Effect of Dual‐Salt Concentrated Electrolytes on the Electrochemical Performance of Silicon Nanoparticles journal January 2020
Concentrated Dual-Salt Electrolyte to Stabilize Li Metal and Increase Cycle Life of Anode Free Li-Metal Batteries journal January 2019
A LiPO 2 F 2 /LiPF 6 dual-salt electrolyte enabled stable cycling performance of nickel-rich lithium ion batteries journal January 2020

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Related Subjects

25 ENERGY STORAGE
Li metal batteries
dual-salt electrolyte
surface film
cathode electrolyte interphase
cycling stability
36 MATERIALS SCIENCE