In this study, LATP (Li 1.3 Al 0.3 Ti 1.7 (PO 4) 3) solid electrolyte is prepared by a sol-gel process using Ti(C 2 H 5 O) 4 , Ti(n-C 3 H 7 O) 4 and Ti(n-C 4 H 9 O) 4 as Ti sources to examine the influence of the Ti source on the electrochemical properties of produced LATP. LATP is successfully produced in all cases, however, AlPO 4 impurity is formed in the Ti(n-C 3 H 7 O) 4 and Ti(n-C 4 H 9 O) 4 samples due to insufficient formation of Ti-O-Al network. In contrast, the AlPO 4 formation is not observed in the Ti(C 2 H 5 O) 4 sample. Also, the Ti(C 2 H 5 O) 4 sample shows the highest sinterability and the largest grain size among the three samples. As a result, the Ti(C 2 H 5 O) 4 sample shows the highest Li ion conductivity due to high grain boundary conductivity and less impurity phase. The selection of Ti source is a key to obtain high conductive LATP solid electrolyte.
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