Solid-State Lithium-Sulfur Batteries Operated at 37 °C with Composites of Nanostructured Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub>/Carbon Foam and Polymer.
basic_science · Level V
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- Record sourced from PubMed, PMID 28388080.
- Also identified by DOI 10.1021/acs.nanolett.7b00221.
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Abstract
An all solid-state lithium-ion battery with high energy density and high safety is a promising solution for a next-generation energy storage system. High interface resistance of the electrodes and poor ion conductivity of solid-state electrolytes are two main challenges for solid-state batteries, which require operation at elevated temperatures of 60-90 °C. Herein, we report the facile synthesis of Al<sup>3+</sup>/Nb<sup>5+</sup> codoped cubic Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) nanoparticles and LLZO nanoparticle-decorated porous carbon foam (LLZO@C) by the one-step Pechini sol-gel method. The LLZO nanoparticle-filled poly(ethylene oxide) electrolyte shows improved conductivity compared with filler-free samples. The sulfur composite cathode based on LLZO@C can deliver an attractive specific capacity of >900 mAh g<sup>-1</sup> at the human body temperature 37 °C and a high capacity of 1210 and 1556 mAh g<sup>-1</sup> at 50 and 70 °C, respectively. In addition, the solid-state Li-S batteries exhibit high Coulombic efficiency and show remarkably stable cycling performance.