Li_2S-SiS_2, Li_2S-SiS_2-Li_4SiO_4系高リチウムイオン伝導性非晶質材料のメカノケミカル合成

概要

論文の詳細を見る
Amorphous materials in the system xLi_2S・(100-x)SiS_2, where x ranged from 50 to 70 mol%, and(100-y)(0.6Li_2S・0.4SiS_2)・yLi_4SiO_4, where y ranged from 0 to 10 mol%, were synthesized by mechanical milling of crystalline starting materials, Li_2S, SiS_2 and Li_4SiO_4. At the compositions with large amounts of Li^+ ions, a part of crystalline Li_2S used as a starting material remained in the milled powder samples. It was found that the milled powder samples in both systems obtained by mechanical milling exhibited high conductivities in the order of 10^<-4>S・cm^<-1> at room temperature in spite of the presence of small amounts of Li_2S crystals. The conductivity values of the pelletized samples of xLi_2S・(100-x)SiS_2 powders maximized at the composition of about x=60. On the other hand, the conductivities in the composition range with y≨5 in the system(100-y)(0.6Li_2S・0.4SiS_2)・yLi_4SiO_4 were nearly the same values in the mesured temperature range and higher by a half order of magnitude than those at the composition with y=10. The transport number of lithium ions of the amorphous materials after mechanically milled was almost unity and the potential window was wider than 10 V at room temperature.
社団法人日本セラミックス協会の論文
2000-02-01