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An electron-blocking interface for garnet-based quasi-solid-state lithium-metal batteries to improve lifespan.
- Source :
- Nature Communications; 6/25/2024, Vol. 15 Issue 1, p1-12, 12p
- Publication Year :
- 2024
-
Abstract
- Garnet oxide is one of the most promising solid electrolytes for solid-state lithium metal batteries. However, the traditional interface modification layers cannot completely block electron migrating from the current collector to the interior of the solid-state electrolyte, which promotes the penetration of lithium dendrites. In this work, a highly electron-blocking interlayer composed of potassium fluoride (KF) is deposited on garnet oxide Li<subscript>6.4</subscript>La<subscript>3</subscript>Zr<subscript>1.4</subscript>Ta<subscript>0.6</subscript>O<subscript>12</subscript> (LLZTO). After reacting with melted lithium metal, KF in-situ transforms to KF/LiF interlayer, which can block the electron leakage and inhibit lithium dendrite growth. The Li symmetric cells using the interlayer show a long cycle life of ~3000 hours at 0.2 mA cm<superscript>−2</superscript> and over 350 hours at 0.5 mA cm<superscript>−2</superscript> respectively. Moreover, an ionic liquid of LiTFSI in C<subscript>4</subscript>mim-TFSI is screened to wet the LLZTO|LiNi<subscript>0.8</subscript>Co<subscript>0.1</subscript>Mn<subscript>0.1</subscript>O<subscript>2</subscript> (NCM) positive electrode interfaces. The Li|KF-LLZTO | NCM cells present a specific capacity of 109.3 mAh g<superscript>−1</superscript>, long lifespan of 3500 cycles and capacity retention of 72.5% at 25 °C and 2 C (380 mA g<superscript>−1</superscript>) with an average coulombic efficiency of 99.99%. This work provides a simple and integrated strategy on high-performance quasi-solid-state lithium metal batteries. Formation of dendrites in solid-state lithium batteries hampers their application. Here, authors deposit a thin film of potassium fluoride on a garnet solid electrolyte that in-situ transforms to a mixed fluoride layer, which blocks electron leakage and inhibits lithium dendrite growth. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 15
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 178086457
- Full Text :
- https://doi.org/10.1038/s41467-024-49715-x