Mechanochemical Synthesis and Li+ Ion Conductivity of Li3N-based Amorphous Solid Electrolytes
A. Hayashi, T. Ohtomo, F. Mizuno and M. Tatsumisago
Department of Applied Chemistry, Graduate School of Engineering,
Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan)
E-mail: hayashi@chem.osakafu-u.ac.jp
Страницы: 163-167
Аннотация
Amorphous solid electrolytes were synthesized in the systems Li3N-P2S5 and Li3N-P via mechanochemical route. Amorphous materials were obtained at the compositions with x = 50 and 60 in the system
xLi3N×(100-x)P2S5 (mol. %), while crystalline Li2S was obviously formed at the compositions with x = 70 and 80. The conductivity increased with increasing Li3N content, and then decreased in the composition range x > 60. The highest conductivity of 2.2×10-5 S/cm at room temperature was achieved at the composition with x=60. The formation of insulative Li2S in the compositions with higher Li3N content is responsible for the decrease of conductivity. Li3N was reacted with P instead of P2S5 by milling in order to prevent the formation of Li2S. The obtained materials were basically amorphous, but partially included crystalline materials such as Li3P and Li7PN4. The 80Li3N×20P (mol. %) material exhibited the highest conductivity of 1.0×10-5 S/cm at room temperature in the system Li3N-P.
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