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High lithium conductivity in Li1-2xCaxSi2N3

Published online by Cambridge University Press:  26 April 2011

Eiichirou Narimatsu ,
Yoshinobu Yamamoto ,
Takashi Takeda ,
Toshiyuki Nishimura  and
Naoto Hirosaki
Eiichirou Narimatsu*
Affiliation:
Nano-Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Yoshinobu Yamamoto
Affiliation:
Nano-Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Takashi Takeda
Affiliation:
Nano-Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Toshiyuki Nishimura
Affiliation:
Nano-Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Naoto Hirosaki
Affiliation:
Nano-Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
*
a)Address all correspondence to this author. e-mail: NARIMATSU.Eiichirou@nims.go.jp
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Abstract

Various compositions of Li1-2xCaxSi2N3 (x = 0–0.2) were synthesized by the reaction of Li3N, Si3N4, and Ca3N2 at temperatures of 1873–2073 K. Ca was incorporated into the LiSi2N3 host lattice to form a solid solution of Li1-2xCaxSi2N3. The activation energy for ionic conduction was decreased and ionic conductivity at room temperature was enhanced by Ca doping. At 298 K, the ionic conductivity of densified Li1-2xCaxSi2N3 (x = 0.075) ceramic reached 1.6 × 10−5 S m−1, almost four orders of magnitude higher than that of densified Li1-2xCaxSi2N3 (x = 0) ceramic (3.1 × 10−9 S m−1). The change in the LiSi2N3 framework upon Ca doping decreased the interaction between the ions and increased the number of defects in the structure, making it easier for mobile Li+ ions to migrate. Moreover, the incorporation of aliovalent substitutional Ca2+ ions in the LiSi2N3 lattice is expected to create Li+ vacancies (VLi) for charge compensation (Li1-2xCaxVLiSi2N3), thereby increasing the number of mobile Li+ ions.

Keywords

LiIonic conductorElectrical properties

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Type
Articles
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Journal of Materials Research , Volume 26 , Issue 9 , 14 May 2011 , pp. 1133 - 1142
Copyright
Copyright © Materials Research Society 2011

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