| Summary: | 碩士 === 義守大學 === 材料科學與工程學系 === 87 === LiTi2(PO4)3 with the NASICON-type crystal structure is one of the promissing Lithium-ion conductive solid electrolytes. Without any cation substitution, LiTi2(PO4)3 has been reported to have a very low ionic conductivity at room temperature. However, if Al+3 and Si+4 partially replace Ti+4 and P+5 into this Lithium-containing crystal structure, its ionic conductivity is significantly increased.
The system(Li, R)1+x (Ti, M)2 (SixP3-x)O12（R= Mg, Ca, and rare earth metal；M=Al, and transition metal）was studied. Through substitution of different ions, the ionic conductivity of this Lithium-containing battery was systematically measured at various（-20℃＜T＜100℃）. The transport mechanism of Lithium ion was explained.
In this study, MgO and Al2O3 are introduced LiTi2SixP3-xO12 crystal structure to observe its effect to the ionic conductivity. It is found that the ionic conductivity increases up to 10-3 Scm-1。
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