Morphological, dielectric and transport properties of garnet-type Li6.25+yAl0.25La3Zr2-yMnyO12 (y=0, 0.05, 0.1, and 0.2)

被引：23
作者：
Dubey, Brahma Prakash [1 ]
Sahoo, Asit [1 ]
Thangadurai, Venkataraman [2 ]
Sharma, Yogesh [1 ]
机构：
[1] Indian Inst Technol Roorkee, Dept Phys, Roorkee 247667, Uttarakhand, India
[2] Univ Calgary, Dept Chem, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
来源：
SOLID STATE IONICS | 2020年 / 351卷
关键词：
LI-ION CONDUCTIVITY; DOPED LI7LA3ZR2O12; SOLID-ELECTROLYTE; PHASE-TRANSITION; CRYSTAL-STRUCTURE; SITE OCCUPATION; AIR STABILITY; AL; TA; GA;
D O I：
10.1016/j.ssi.2020.115339
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Garnet-type solid Li ion conductor Li7La3Zr2O12 (LLZO) has received considerable attention due to its high total (bulk + grain boundary) ionic conductivity at room temperature and its chemical stability with Li metal. To improve the ionic conductivity of LLZO, the hetrovalent doping at Zr-site and Al-doping at Li site was done for the optimization of Li concentration in LLZO. Thus, considering prominent role of various dopant in ionic and/or electronic conduction of LLZO, the effect of Mndoping at Zr-site in the Al-doped Li6.25+yAl0.25La3Zr2-yMnyO12 (y = 0, 0.05, 0.1, 0.2) on the microstructure, dielectric and transport properties is studied. The Mndoping at Zr-site in Al-LLZO is confirmed by electron paramagnetic resonance and X-ray photoelectron spectroscopy techniques. A correlation between structure, microstructure and the Li+ ion conduction is established. Amongst all investigated compounds, Li6.35Al0.25La3Zr1.9Mn0.1O12 exhibit highest total ionic conductivity of 0.34 x 10(-4) Scm(-1) at 25 degrees C. Further, the electrochemical window and stability of Mn doped-LLZO with Li metal is examined by cyclic voltammetry.
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页数：11
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