Effects of Nd and Al co-doping on the microstructure and lithium-ion transport in Li7La3Zr2O12 solid-state batteries

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2024-05-19 DOI:10.1016/j.ssi.2024.116598

Mohammad Golmohammad , Amirreza Sazvar , Mohammad Maleki Shahraki , Mohsen Salimi

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Abstract

In this study, we synthesized co-doped Li_6.25Al_0.25La_3-yNd_yZr₂O₁₂ (LALNZO) solid-state electrolytes with varying Nd contents to investigate the influence Nd plays on phase evolution, microstructure, and lithium-ion conductivity. It was found that incorporating Nd ions into the lattice reduced bulk resistance by controlling Li⁺ concentration. However, X-ray diffraction analysis revealed that excessive Nd content led to the formation of Nd₂O₃, which negatively impacted ion transport and increased grain boundary resistance. It is noteworthy that the LALNZO (y = 0.2) ceramic exhibited outstanding performance, with 94% relative density, and ionic conductivity of 4.7 × 10⁻⁴ S/cm. The activation energy was 0.32 eV. Further, Li_6.25Al_0.25La_2.8Nd_0.2Zr₂O₁₂ was able to demonstrate a stable capacity of 103 mA.h. g⁻¹ after 50 cycles at a current density of 0.1C when used as an electrolyte in lithium-ion batteries. The findings of this study provide valuable insights for developing advanced solid-state electrolytes for lithium-ion batteries.

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掺杂钕和铝对 Li7La3Zr2O12 固态电池微观结构和锂离子传输的影响

在这项研究中，我们合成了不同钕含量的共掺杂 Li6.25Al0.25La3-yNdyZr2O12 (LALNZO)固态电解质，以研究钕对相演化、微观结构和锂离子电导率的影响。研究发现，在晶格中加入钕离子可通过控制 Li+ 浓度来降低体电阻。然而，X 射线衍射分析表明，过量的钕含量会导致 Nd2O3 的形成，从而对离子传输产生负面影响并增加晶界电阻。值得注意的是，LALNZO（y = 0.2）陶瓷表现出卓越的性能，其相对密度为 94%，离子导电率为 4.7 × 10-4 S/cm。活化能为 0.32 eV。此外，Li6.25Al0.25La2.8Nd0.2Zr2O12 用作锂离子电池的电解质时，在电流密度为 0.1C 的条件下，经过 50 次循环后，其容量稳定在 103 mA.h. g-1。这项研究结果为开发先进的锂离子电池固态电解质提供了宝贵的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.