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Solid-State Lithium Batteries with Cathode-Supported Composite Solid Electrolytes Enabling High-Rate Capability and Excellent Cyclic Performance.
- Source :
- Batteries; Oct2023, Vol. 9 Issue 10, p490, 13p
- Publication Year :
- 2023
-
Abstract
- In this study, robust composite solid electrolytes were developed and employed to enhance the performance of Li-metal batteries significantly. The robust composite solid electrolytes are composed of a soft polymer, poly(ethylene oxide), a Li salt, bis(trifluoromethanesulfonyl)imide (LiTFSI), and super ionic conductive ceramic fillers such as Li<subscript>1.5</subscript>Al<subscript>0.5</subscript>Ti<subscript>1.5</subscript>(PO<subscript>4</subscript>)<subscript>3</subscript> (LATP), and Li<subscript>6.4</subscript>La<subscript>3</subscript>Zr<subscript>1.4</subscript>Ta<subscript>0.6</subscript>O<subscript>12</subscript> (LLZTO). The main goal of this study is to enhance the electrochemical stability and ionic conductivity. The ionic conductivities of the composite solid electrolytes were found to be 2.08 × 10<superscript>−4</superscript> and 1.64 × 10<superscript>−4</superscript> S cm<superscript>−1</superscript> with the introduction of LATP and LLZTO fillers, respectively. The results prove that the fabricated solid electrolyte was electrochemical stable at voltage exceeding 4.25 V vs. Li/Li<superscript>+</superscript>. The internal resistance of the solid electrolyte significantly reduced compared to gel electrolyte. This reduction can be attributed to the alleviation of bulk electrolyte, charge-transfer, and interfacial electrolyte/electrode impedance. When LiFePO<subscript>4</subscript> cathode sheets are coated with a composite solid electrolyte containing LATP powders, the resulting Li-metal battery displays high capacity at 5 C (with a capacity retention of 65.2% compared to the original capacity at 0.2 C) as well as superior cyclic stability and excellent Coulombic efficiency (>99.5%, 200 cycles). These results confirm that the composite solid electrolyte acts as a protective layer which has the ability to prevent the growth of Li dendrites. Consequently, the fabricated electrolyte configuration can be engineered to enable high energy/power density and electrochemical stable cyclability in Li-metal batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 23130105
- Volume :
- 9
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Batteries
- Publication Type :
- Academic Journal
- Accession number :
- 173264960
- Full Text :
- https://doi.org/10.3390/batteries9100490