Stabilization-of cubic lithium-stuffed garnets of the type "Li7La3Zr2O12" by addition of gallium
Stabilization-of cubic lithium-stuffed garnets of the type "Li7La3Zr2O12" by addition of gallium
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DOI：
10.1016/j.jpowsour.2012.09.111
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发表时间：
2013-03-01
影响因子：
9.2
通讯作者：
Janek, Juergen
中科院分区：
文献类型：
--
作者：
El Shinawi, Hany;Janek, Juergen
通过掺入镓，Li 7 La 3 Zr 2 O 12类型的立方体锂填充石榴石已成功稳定化。该材料已通过溶胶-凝胶过程制备，最终在1085 ℃下煅烧6 h。在所应用的合成条件下，0.3摩尔镓离子（每摩尔Li 7 La 3 Zr 2 O 12）足以完全稳定立方石榴石型相。增加镓的分数导致烧结性和锂离子导电性的显着改善。过量的镓离子以LiGaO 2的形式充当烧结助剂，并且仅存在于晶界处。镓改性石榴石在20 ℃时的电导率高达5.4 x 10（-4）S cm（-1），活化能在0.32-0.37 eV范围内。(C)2012 Elsevier B. V.保留所有权利。
Cubic lithium-stuffed garnets of the type Li7La3Zr2O12 have been successfully stabilized by incorporation of gallium. The materials have been prepared by a sal-gel procedure with final calcination at 1085 degrees C for 6 h. Under the applied synthesis conditions, 0.3 mole of gallium ions (per mole of Li7La3Zr2O12) were sufficient to fully stabilize the cubic garnet-type phase. Increasing the fraction of gallium led to significant improvement of sinterability and lithium ion conductivity. Excess gallium ions, in the form of LiGaO2, act as a sintering aid and reside exclusively at the grain boundaries. The gallium-modified garnets showed conductivities up to 5.4 x 10(-4) S cm(-1) at 20 degrees C, and activation energies in the range 0.32-0.37 eV. (C) 2012 Elsevier B.V. All rights reserved.