Journal
SOLID STATE IONICS
Volume 261, Issue -, Pages 95-99Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2014.04.005
Keywords
Perovskite; Li(3/8)Sr(7/16)Ta(3/4)Zr1/O-4(3); Solid electrolyte; Powder-bed sintering; Lithium ion conductivity
Categories
Funding
- JSPS KAKENHI Grant [26630111]
- Research Foundation for the Electrotechnology of Chubu [R-25209]
- Grants-in-Aid for Scientific Research [26630111] Funding Source: KAKEN
Ask authors/readers for more resources
Perovskite-type compounds ABO(3) in which A = La, Li and B = Ti (Li-2/3 - 3(x)La(x)TiO(3), LLT) exhibit very high bulk ionic conductivity of 1.2 x 10(-3) S cm(-1) at 30 degrees C, but LLT has very large grain-boundary resistance and is only stable above 1.6-1.8 V vs. Li/Li+ because Ti4+ can be easily reduced to Ti3+ below this potential. Li3/8Sr7/16Ta3/4Zr1/4O3 (LSTZ), in which A and B cations of SrZrO3 are partially substituted by Li and Ta, has been reported to be more stable against the lithiated negative electrode than LLT. In this paper, we synthesized LSTZ by using powder-bed sintering method, which is commonly used for preparation of dense garnet-structured lithium-ion conductor Li7La3Zr2O12 (LLZ). At sintering process, the LSTZ pellet was covered with the same mother powder to suppress the excess Li loss during high temperature treatment and the formation of secondary phases. For LSTZ sintered with covering LSTZ mother powder, secondary phases such as SrTa2O6 and Sr2Ta2O7 Were significantly reduced and LSTZ grains in the pellet were in good contact with each other. According to these improvement, the bulk and total (bulk + grain-boundary) ionic conductivity at 27 degrees C of LSTZ attained to 3.5 x 10(-4) S cm(-1) and 2.7 x 10(-4) S cm 1, respectively. The total conductivity at room temperature is approximately 3 times higher than that as previously reported and comparable with LLT and LIZ. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available