Preparation and properties of LixLa0.5TiO3 perovskite oxide electrolytes. Issue 9 (17th May 2017)

• Record Type: Journal Article
• Authors: Hu, Xitao; Qiang, Wenjiang; Huang, Bingxin
• Is Part Of: Journal of the American Ceramic Society. Volume 100:Issue 9(2017)
• Page Start: 4153
• Page End: 4158
• Publication Date: 2017-05-17
• Subjects: ion conductivity -- lithium battery -- mechanical property -- oxide solid electrolyte -- perovskite; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14946
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Solid electrolytes with high lithium ionic conductivity and outstanding mechanical stability are essential for all solid‐state lithium ion batteries. Perovskite Li x La0.5 TiO3 is one of the most promising as solid electrolytes candidates. Li x La0.5 TiO3 with various initial Li2 O (0.5≤ x ≤0.569) is synthesized by traditional solid‐state reaction at high temperatures. The crystal structure is not remarkably affected by the Li2 O quantity, yet higher porosity is obtained as a result of excess Li2 O. The Young's modulus, hardness, and fracture toughness are evaluated with indentation method. The Young's modulus increases from 72 to 148 GPa with increasing Li2 O, which means that a small variation of Li quantity in Li x La0.5 TiO3 results in over a 100% change in Young's modulus. However, the fracture toughness exhibits an opposite trend with that of the Young's modulus. The high Young's modulus and fracture toughness could guarantee the structural integrity during cycle operations.