Al^(3+)掺杂立方相Li_7La_3Zr_2O_(12)的制备及性能表征  

Preparation and characterization of cubic Li_7La_3Zr_2O_(12) by inclusion of Al^(3+)

作　　者：陈姝[1] 罗杰[1] 胡冬雪[1] 水淼[1] 

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《电源技术》2016年第3期529-531,553,共4页Chinese Journal of Power Sources

基　　金：科技部"973"基础研究项目(2010CB635116);国家自然科学基金委项目(21173190);浙江省自然科学基金(Y13B010020);宁波市科技局(2014A610034);宁波大学王宽诚幸福基金对本研究的支持和赞助

摘　　要：采用一种柠檬酸辅助聚合的溶胶-凝胶法制备了掺杂2%(摩尔分数)Al3+的立方相结构的Li7La3Zr2O12固体电解质,同时,采用高温固相法尝试合成不掺杂Al3+的Li7La3Zr2O12作为对比。分析结果表明:热处理温度超过1 000℃时Li7La3Zr2O12易发生分解;而掺杂2%(摩尔分数)Al3+的Li7La3Zr2O12能在900℃时保持稳定立方相结构,在1 000℃下烧结6 h后得到高致密度的烧结体。该法制备的Li7La3Zr2O12样品表现出高离子电导率:298 K时为4.5×10-5 S/cm,523K时达到3.6×10-3 S/cm。Li+迁移活化能大约为25.1 k J/mol。上述结果表明,作为全固态电池电解质,Al3+掺杂的Li7La3Zr2O12有较好的应用前景。A polymerization assisted citric acid sol-gel method was applied to prepare cubic structured 2% Al^3＋ doped Li7La3Zr2O12Li^＋ conduction solid state electrolyte. At the meantime, the Al^3＋ free Li7La3Zr2O12 was also prepared for comparison. XRD results show that Li7La3Zr2O12 is prone to decomposition while heat treated above 1 000 ℃ and that2% Al3＋ doping sufficiently stabilized cubic structured Li7La3Zr2O12 at a temperature as low as 900 ℃; sintered at 1000 ℃ for 6h, fully dense sintered body is obtained. The as-prepared Li7La3Zr2O12 exhibited high ionic conductivity of 4.5 ×10^-5 S/cm at 298 K and reached 3.6×10^-3 S/cm at 523 K. The activation energies of Li^＋ migration was calculated to be about 25.1 k J/mol. This indicates that Al^3＋ doped Li7La3Zr2O12 is a very promising candidate as electrolyte for the construction of all-solid-state batteries.

关 键 词：LLZ 柠檬酸辅助聚合的溶胶-凝胶法 离子电导率 Al^3+掺杂 

分 类 号：TM912[电气工程—电力电子与电力传动]