(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以Ti(OC4H9)4、Li(CH3COO)·2H2O、Al(NO3)·9H2O和NH4H2PO4為原料，采用溶膠-凝膠法合成Li1.3Al0.3Ti1.7(PO4)3粉體，并研究熱處理溫度對(duì)粉體結(jié)構(gòu)的影響。通過X射線衍射儀(XRD)、掃描電鏡(SEM)和電化學(xué)阻抗譜(EIS)對(duì)制備粉體的結(jié)構(gòu)與性能進(jìn)行表征。結(jié)果表明：溶膠凝膠法可合成純相LATP粉體，降低熱處理溫度，且粉體結(jié)晶性良好，粒徑小于1 μm，室溫下電導(dǎo)率為1.32×10-3 S/cm，673 K時(shí)電導(dǎo)率達(dá)到8.94×10-2 S/cm，473~673 K下活化能為31.55 kJ/mol。
關(guān)鍵字: 鋰快離子導(dǎo)體；Li1.3Al0.3Ti1.7(PO4)3；離子電導(dǎo)率；溶膠-凝膠
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Li1.3Al0.3Ti1.7(PO4)3 powders were prepared by sol-gel method using Ti(OC4H9)4, Li(CH3COO)·2H2O, Al(NO3)·9 H2O and NH4H2PO4 as starting materials. The influence of synthesis temperature on the structure of Li1.3Al0.3Ti1.7(PO4)3 powders was studied. The structure and the characterization of the powders were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM)and electrochemical impedance spectroscopy (EIS). The results show that pure Li1.3Al0.3Ti1.7(PO4)3 powders with good crystallinity and particle size below 1 μm are obtained by sol-gel method, and the heating temperature decreases. The lithium ion conductivity is 1.32×10-3 S/cm at room temperature, while it reaches its maximum 8.94×10-2 S/cm at 673 K, and its activation energy is 31.55 kJ/mol at the temperature range of 473-673 K
Key words: lithium fast ion conductor; Li1.3Al0.3Ti1.7(PO4)3; ionic conductivity; sol-gel method
