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中國有色金屬學(xué)報

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷第1期總第154期 2012年1月

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文章編號：1004-0609(2012)1-0144-06

Li_1.3Al_0.3Ti_1.7(PO₄)₃基鋰離子導(dǎo)電材料的制備與表征

劉玉龍¹，張鴻^{1, 2}，薛丹¹，崔彬¹，李志成^{1, 2}

(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083;
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長沙 410083)

摘要: 采用以聚乙烯醇為聚合劑的濕化學(xué)法合成Li1.3Al_0.3Ti_1.7(PO₄)₃(LATP)鋰離子導(dǎo)電材料，以Li₄P₂O₇(LP)為助燒劑制備LATP-xLP (x=0, 0.01, 0.03, 0.05，摩爾分?jǐn)?shù))鋰離子導(dǎo)電固體電解質(zhì)材料。利用X射線衍射、掃描電子顯微鏡和交流阻抗技術(shù)分別對材料的相組成、微觀組織和離子導(dǎo)電性進(jìn)行表征。通過分析材料晶體結(jié)構(gòu)和交流阻抗特性，對材料的導(dǎo)電機(jī)理進(jìn)行研究。結(jié)果表明：LATP粉體和LATP-xLP陶瓷具有菱方晶系結(jié)構(gòu)，空間群為R₃-c，該晶體結(jié)構(gòu)具有三維離子導(dǎo)電通道；添加LP助燒劑使陶瓷的燒結(jié)溫度降低了150 ℃、電導(dǎo)率得到了提高。交流、直流導(dǎo)電特性測量得出LATP-0.03LP的離子導(dǎo)電性占總導(dǎo)電性的99.5%。

關(guān)鍵字: Li_1.3Al_0.3Ti_1.7(PO₄)₃；合成；助燒劑；離子導(dǎo)電性

Fabrication and characterization of
Li_1.3Al_0.3Ti_1.7(PO₄)₃based Li-ion conductive materials

LIU Yu-long¹, ZHANG Hong^{1, 2}, XUE Dan¹, CUI Bin¹, LI Zhi-cheng^1,2

（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University,
Changsha 410083, China）

Abstract:The Li_1.3Al_0.3Ti_1.7 (PO₄)₃(LATP) lithium-ion conductivematerials were prepared by a wet chemical method which is polymerized by polyvinyl alcohol. The LATP-xLP (x=0, 0.01, 0.03, 0.05, mole fraction) ceramics were prepared by using Li₄P₂O₇(LP) as sintering additive. The phases and microstructures of the prepared materials were investigated by X-ray diffraction and scanning electron microscope. Ionic conductivities were measured by AC impedance measurement. The conduction mechanism of the materials was studied by analyzing the crystal structure and AC impedance characteristics of the materials. The results show that the LATP powderand LATP-xLP (x=0, 0.01, 0.03, 0.05) ceramics have the rhombohedral crystalline structure with the space group of R₃-c, which has 3-dimensional ionic conducting path. The LP sintering additive can decrease the sintering temperature of LATP by 150 ℃ and improve the ionic conductivity. The analysis of the DC and AC conductivities of the LATP-0.03LP ceramics reveals that the ionic conductivity is 99.5% of the total conductivity.

Key words: Li_1.3Al_0.3Ti_1.7(PO₄)₃; synthesis; sintering additive; ionic conductivity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW