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Anatase TiO2 thin-film electrode was prepared on Li1+xA1xTi2-x(PO4)3-based(LTP) solid electrolyte bya sol -gelcoating method . Th e prepared thin film was characterized with X-raydiffraction , Raman spectroscop y, and it was confirmed that the thin film consisted of the single phase of anatase TiO2. The prepared thin film was very fiat and crack-free . An electroch emical cell Li/Polymer-gel electrolyte/LTP/TiO2/Au was fabricated and the electrochemical properties of the TiO2/LTP were investig ated. The Li i on insertion/extraction into/from the TiO2 took place reversibly th rough the s olid-solid interface. INTRODUCTION There have been many studies on all solid-state lithium batteries because of their advantages such as inflammability and no-leakage of liquid electrolytes .1)1-3) Li1 +xAlxTi2-x(PO4)3 (LTP) with NASICON-type structure is a well -known high ionic conductor and a promising solid electrolyte for all solid -state lithium batteries .4)5) W eppner et al . prepared an all solid -state battery Li4Ti5O12/Li1.3Al0.3Ti1.7(PO4)3/LiMn2O4, and it operated successfully at room temperature.1)In general , when using ceramic solid electrolytes , a high resistance is produced owing to an insufficient contact at interface between solid electrolyte and standard electrode sheet as used in lithium ion batteries with li quid electrolyte. Th erefore, it is required to increase the contact area betw een electrode and solid electrolyte in order to decrease the electrochemical interfacial resistance. So far, many researchers have solved the insufficient contact proble m with a high mechanical pressure.1)'2) Another approach is a fabrication of battery active material on ceramic solid electrolyte by using thin film technology . Bates et al. have prepared a thin film battery Li/LIPON/LiCoO2 by a sputtering process .3) Compared with sputtering and chemical vapor deposition , sol-gel process is a low cost process .In this study, anat ase TiO2 thin-film electrode was prepared on LIP plate b y a sol-gel process. Thi n film of TiO2 can be easily prepared by a sol -gel process ,6)and the anatase TiO2 is

phosphorus research bulletin

PREPARATION OF TiO&lt;SUB&gt;2&lt;/SUB&gt; THIN-FILM ELECTRODE ON Li&lt;SUB&gt;1+x&lt;/SUB&gt;Al&lt;SUB&gt;x&lt;/SUB&gt;Ti&lt;SUB&gt;2-x&lt;/SUB&gt;(PO&lt;SUB&gt;4&lt;/SUB&gt;)&lt;SUB&gt;3&lt;/SUB&gt; SOLID ELECTROLYTE