Titanium-Oxygen Clusters Brazing Li with Li<sub>6.5</sub>La<sub>3</sub>Zr<sub>1.5</sub>Ta<sub>0.5</sub>O<sub>12</sub> for High-Performance All-Solid-State Li Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 37624088.
- Also identified by DOI 10.1021/acs.nanolett.3c01731.
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Abstract
Garnet-based solid-state electrolytes are considered crucial candidates for solid-state Li batteries due to their high Li<sup>+</sup> conductivity and nonflammability; however, poor interfacial contact with the Li anode and growth of Li dendrites limit their application. Herein, a high-activity titanium-oxygen cluster is used as a brazing filler to braze the Li<sub>6.5</sub>La<sub>3</sub>Zr<sub>1.5</sub>Ta<sub>0.5</sub>O<sub>12</sub> (LLZTO) with an Li anode into the whole unit. The brazing layer leads to a significantly lower interfacial impedance of 8.32 Ω cm<sup>2</sup>. Furthermore, the brazing layer is an isotropic amorphous ion-electron hybrid conductive layer, which significantly promotes Li<sup>+</sup> transport and regulates the distribution of the electric field, therefore inhibiting the growth of Li dendrites. The cell exhibits an ultrahigh critical current density of 2.3 mA cm<sup>-2</sup> and stable cycling of over 4000 h at 0.5 mA cm<sup>-2</sup> (25 °C).