The activation entropy for ionic conduction and critical current density for Li charge transfer in novel garnet-type Li6.5La2.9A0.1Zr1.4Ta0.6O12 (A = Ca, Sr, Ba) solid electrolytes
The activation entropy for ionic conduction and critical current density for Li charge transfer in novel garnet-type Li6.5La2.9A0.1Zr1.4Ta0.6O12 (A = Ca, Sr, Ba) solid electrolytes
复制标题
新型石榴石型Li6.5La2.9A0.1Zr1.4Ta0.6O12 (A = Ca, Sr, Ba)固体电解质中离子传导的活化熵和Li电荷转移的临界电流密度
DOI：
10.1039/c9ta12193e
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
V. Thangadurai
中科院分区：
文献类型：
--
作者：
S. Palakkathodi Kammampata;H. Yamada;T. Ito;R. Paul;V. Thangadurai
本文采用统计力学方法研究了Li填充的Li6.5La2.9A0.1Zr1.4Ta0.6O12（A = Ca，Sr，Ba）石榴石的活化熵（ΔS）值，并研究了陶瓷处理在Li和Li填充的Li6.5La2.9A0.1Zr1.4Ta0.6O12石榴石之间Li离子电荷转移中的作用。所研究的固体电解质通过固相反应和放电等离子体烧结方法制备。通过粉末X射线衍射证实了石榴石型结构的形成。用电子探针显微分析仪和波长色散X射线光谱仪研究了元素在所制备的组合物中的均匀分布。使用电化学交流阻抗谱测定锂离子电导率。计算得到的石榴石型Li6.5La2.9A0.1Zr1.4Ta0.6O12的ΔS值比Li 4SiO 4（Li+）、Na 3 ZrMgP 3 O 12（Na+）、AgI（Ag+）和Ag-β-Al 2 O3（Ag+）等固体电解质高一个数量级，与聚合物锂离子电解质（PEO）10-LiClO 4相当。SPS处理的Li6.5La2.9A0.1Zr1.4Ta0.6O12样品在22 °C下的体Li离子电导率为5.5 × 10−4 S cm−1。在这项工作中研究的所有样品中，Li6.5La2.9Sr0.1Zr1.4Ta0.6O12在25 °C下表现出令人印象深刻的3.5 Ω cm 2的锂离子电荷转移电阻（RCT），没有任何金属氧化物（例如Al 2 O3和ZnO）表面涂层，并表现出0.6 mA cm-2的临界电流密度。
In this paper, we report the activation entropy (ΔS) values for Li-stuffed Li6.5La2.9A0.1Zr1.4Ta0.6O12 (A = Ca, Sr, Ba) garnets using a statistical mechanical approach and the role of ceramic processing in Li ion charge transfer between elemental Li and Li-stuffed Li6.5La2.9A0.1Zr1.4Ta0.6O12 garnets. The investigated solid electrolytes were prepared by a solid-state reaction and a spark plasma sintering method. The formation of the garnet-type structure was confirmed by powder X-ray diffraction. The homogeneous distribution of the elements in the prepared compositions was investigated using electron probe micro analyzer coupled with a wavelength-dispersive X-ray spectrometer. Li ion conductivity was determined using electrochemical ac impedance spectroscopy. The calculated ΔS value for garnet-type Li6.5La2.9A0.1Zr1.4Ta0.6O12 is found to be one order of magnitude higher than that of other solid electrolytes such as Li4SiO4 (Li+), Na3ZrMgP3O12 (Na+), AgI (Ag+) and Ag-β-alumina (Ag+) and comparable to that of the polymer Li ion electrolyte (PEO)10-LiClO4. SPS-processed Li6.5La2.9A0.1Zr1.4Ta0.6O12 samples showed a bulk Li ion conductivity of 5.5 × 10−4 S cm−1 at 22 °C. Among all the samples investigated in this work, Li6.5La2.9Sr0.1Zr1.4Ta0.6O12 showed an impressive Li ion charge transfer resistance (RCT) of 3.5 Ω cm2 at 25 °C without any surface coating of metal oxides, such as Al2O3 and ZnO, and exhibited a critical current density of 0.6 mA cm−2.
登录
查看更多内容
影响因子：
--
作者：
BRACKETT, EB;BRACKETT, TE;SASS, RL
通讯作者：
SASS, RL
Na3AZr(PO4)3 (A=Mg, Ni)和Li2.6Na0.4NiZr(PO4)3磷酸盐的合成、晶体结构和光谱性质
DOI：
10.1016/j.jssc.2006.03.003
发表时间：
2006
期刊：
影响因子：
--
作者：
M. Chakir;A. Jazouli;D. D. Waal
通讯作者：
D. D. Waal
DOI：
--
发表时间：
1935
期刊：
影响因子：
--
作者：
L. Helmholz
通讯作者：
L. Helmholz
SrBrxI2−x 系统的 X 射线衍射研究
DOI：
10.1016/0022-4596(83)90155-x
发表时间：
1983
期刊：
影响因子：
--
作者：
S. Hodorowicz;H. Eick
通讯作者：
H. Eick
影响因子：
3.2
作者：
ALMOND, DP;DUNCAN, GK;WEST, AR
通讯作者：
WEST, AR