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Low-cost and facile synthesis of LAGP solid state electrolyte via a co-precipitation method.
- Source :
- Applied Physics Letters; 7/11/2022, Vol. 121 Issue 2, p1-9, 9p
- Publication Year :
- 2022
-
Abstract
- A solid-state electrolyte with high ionic conductivity and improved safety is a strong competitor in the race for the development of next-generation solid-state lithium batteries, which have stepped into the limelight of materials research. Li<subscript>1.5</subscript>Al<subscript>0.5</subscript>Ge<subscript>1.5</subscript>(PO<subscript>4</subscript>)<subscript>3</subscript> (LAGP) with satisfied ionic conductivity (∼10<superscript>−4</superscript> S cm<superscript>−1</superscript>) at room temperature, high stability in the ambient atmosphere, and a facile sintering nature shows a promising potential for applications in solid-state lithium batteries. However, the current synthesis methods like solid-state strategy and liquid phase route all require harsh conditions, such as long thermal treatments, expensive raw materials, and complex operation. In this study, we propose a co-precipitation method for synthesizing the LAGP solid electrolyte with low-cost and nontoxic GeO<subscript>2</subscript> as the germanium source. Process optimization in the pH value and water bath temperature was employed as a strategy to eliminate the remnants of GeO<subscript>2</subscript>, and the pure LAGP phase is acquired. Moreover, the co-precipitation method can also reduce the sintering temperature of LAGP to 750 °C so that uniform nano-LAGP grains (∼150 nm) can be obtained. During the subsequent processing, denser LAGP pellets are fabricated and exhibit a high ionic conductivity of 5.87 × 10<superscript>−4</superscript> S cm<superscript>−1</superscript> at 30 °C; the Li/Li symmetrical batteries periodically cycle at room temperature for above 310 h with a constant current density of 0.05 mA cm<superscript>−2</superscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 121
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 158015187
- Full Text :
- https://doi.org/10.1063/5.0098362