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In Situ-Initiated Poly-1,3-dioxolane Gel Electrolyte for High-Voltage Lithium Metal Batteries.
- Source :
- Molecules; Jun2024, Vol. 29 Issue 11, p2454, 13p
- Publication Year :
- 2024
-
Abstract
- To realize high-energy-density Li metal batteries at low temperatures, a new electrolyte is needed to solve the high-voltage compatibility and fast lithium-ion de-solvation process. A gel polymer electrolyte with a small-molecular-weight polymer is widely investigated by combining the merits of a solid polymer electrolyte (SPE) and liquid electrolyte (LE). Herein, we present a new gel polymer electrolyte (P-DOL) by the lithium difluoro(oxalate)borate (LiDFOB)-initiated polymerization process using 1,3-dioxolane (DOL) as a monomer solvent. The P-DOL presents excellent ionic conductivity (1.12 × 10<superscript>−4</superscript> S cm<superscript>−1</superscript>) at −20 °C, with an oxidation potential of 4.8 V. The Li‖LiCoO<subscript>2</subscript> cell stably cycled at 4.3 V under room temperature, with a discharge capacity of 130 mAh g<superscript>−1</superscript> at 0.5 C and a capacity retention rate of 86.4% after 50 cycles. Moreover, a high-Ni-content LiNi<subscript>0.8</subscript>Co<subscript>0.1</subscript>Mn<subscript>0.1</subscript>O<subscript>2</subscript> (NCM811) cell can steadily run for 120 cycles at −20 °C, with a capacity retention of 88.4%. The underlying mechanism of high-voltage compatibility originates from the dense and robust B- and F-rich cathode interface layer (CEI) formed at the cathode interface. Our report will shed light on the real application of Li metal batteries under all-climate conditions in the future. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14203049
- Volume :
- 29
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Molecules
- Publication Type :
- Academic Journal
- Accession number :
- 177861700
- Full Text :
- https://doi.org/10.3390/molecules29112454