Achieving high performance for aluminum stabilized Li7La3Zr2O12 solid electrolytes for all solid‐state Li‐ion batteries: A thermodynamic point of view. (18th October 2018)

• Record Type: Journal Article
• Authors: Dermenci, Kamil Burak; Turan, Servet
• Is Part Of: International journal of energy research. Volume 43:Number 1(2019)
• Page Start: 141
• Page End: 149
• Publication Date: 2018-10-18
• Subjects: activation energy -- EIS -- HSC -- Li7La3Zr2O12 -- micro‐Raman; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.4203
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: For the solid‐state reaction synthesis of Al containing Li7 La3 Zr2 O12, various precursors have been used. Since there is a lack of general agreement for choosing precursors, a quantitative approach to build a consensus is required. In this study, a thermodynamic point of view for selecting the precursors in the field of Li7 La3 Zr2 O12 synthesis was covered according to the Gibbs free energy and enthalpy change of precursors' decomposition reactions. In terms of Gibbs free energy change calculations, LiOH, La(OH)3, and Al(OH)3 were favorable whereas, LiOH, La2 O3, and Al(OH)3 were the preferred precursors for the enthalpy change calculations. Pellets prepared by using the favored precursors calculated from enthalpy change showed improved densification, higher ionic conductivity (2.11 × 10 −4 S/cm), and lower activation energy (0.23 eV) compared with Gibbs free energy change. As a thermodynamically favored aluminum precursor, Al(OH)3 was discussed in the present study and hinders the ionic conductivity in comparison to Al2 O3 . Abstract : A thermodynamic approach for selecting the preferred precursors in the field of Li7 La3 Zr2 O12 synthesis was covered based on the Gibbs energy and enthalpy change of widely used precursors' decomposition reactions. A novel Al stabilizer, Al(OH)3, was found to be thermodynamically favored and used for the first time. Pellets prepared by using the favored precursors calculated from enthalpy change showed improved densification, higher ionic conductivity, and lower activation energy.