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Title: Closo ‐Borate Gel Polymer Electrolyte with Remarkable Electrochemical Stability and a Wide Operating Temperature Window

Journal Article · · Advanced Science
 [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [2]; ORCiD logo [1]
  1. Department of Chemistry and Biochemistry California State University Northridge 18111 Nordhoff St. Northridge CA 91330 USA
  2. Advanced Manufacturing and Energy Science Savannah River National Laboratory Aiken SC 29803 USA
  3. Physical and Life Sciences Directorate Lawrence Livermore National Laboratory Livermore CA 94551 USA
  4. Spectroscopy Separations and Material Characterization Savannah River National Laboratory Aiken SC 29803 USA
  5. Energy Nanomaterials Sandia National Laboratory Livermore CA 94551 USA

Abstract A major challenge in the pursuit of higher‐energy‐density lithium batteries for carbon‐neutral‐mobility is electrolyte compatibility with a lithium metal electrode. This study demonstrates the robust and stable nature of a closo ‐borate based gel polymer electrolyte (GPE), which enables outstanding electrochemical stability and capacity retention upon extensive cycling. The GPE developed herein has an ionic conductivity of 7.3 × 10 −4  S cm −2 at room temperature and stability over a wide temperature range from −35 to 80 °C with a high lithium transference number ( = 0.51). Multinuclear nuclear magnetic resonance and Fourier transform infrared are used to understand the solvation environment and interaction between the GPE components. Density functional theory calculations are leveraged to gain additional insight into the coordination environment and support spectroscopic interpretations. The GPE is also established to be a suitable electrolyte for extended cycling with four different active electrode materials when paired with a lithium metal electrode. The GPE can also be incorporated into a flexible battery that is capable of being cut and still functional. The incorporation of a closo ‐borate into a gel polymer matrix represents a new direction for enhancing the electrochemical and physical properties of this class of materials.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Savannah River National Lab (SRNL), Aiken, SC (United States); Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Environmental Management (EM)
Grant/Contract Number:
89303321CEM000080; AC52-07NA27344; NA0003525
OSTI ID:
1862050
Report Number(s):
LLNL-JRNL-829954; SRNL-STI-2021-00505; 2106032
Journal Information:
Advanced Science, Journal Name: Advanced Science Journal Issue: 16 Vol. 9; ISSN 2198-3844
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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