The effect of Ga doping on the microstructure and electrochemical properties of Li7La3Zr2O12 garnet-type solid electrolyte

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-02-01 DOI:10.1016/j.ssi.2024.116765

Shihao Fu , Pingmei Li , Shiyu Yu , Yang Hu , Yibo Liu , Daming Chen , Yaqing Wei , Yuanxun Li , Yong Chen

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引用次数: 0

Abstract

The garnet-type Li₇La₃Zr₂O₁₂ (LLZO) has garnered significant attention due to its superior thermal stability and broad electrochemical window. However, LLZO exhibits instability at room temperature and readily transforms from a cubic phase (c-LLZO) to a tetragonal phase (t-LLZO), resulting in issues such as low ionic conductivity. Herein, the effect of Ga doping on LLZO is investigated. Combined with SEM, activation energy, ionic conductivity and XRD refinement, the results demonstrate that Li_7-3xGa_xLa₃Zr₂O₁₂ exhibits better properties when x = 0.25. Solid-state nuclear magnetic resonance (SSNMR) showed that Ga0.25-LLZO was favorable for promoting Li⁺ transport. Moreover, Li|[email protected]|Li symmetric cells exhibit lower interfacial specific impedance (IASR) and higher critical current density (CCD) than both Li|Ag@Ga0-LLZO|Li and Li|[email protected]|Li and was stabilized at 0.15 mA/cm² for 1300 h of stable cycling. In addition, the all-solid-state battery Li|[email protected]|LFP was cycled at 0.2C for 100 cycles with 82 % capacity retention, demonstrating its promising application in lithium batteries.

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Ga掺杂对Li7La3Zr2O12石榴石型固体电解质微观结构和电化学性能的影响

石榴石型Li7La3Zr2O12 （LLZO）由于其优异的热稳定性和广阔的电化学窗口而引起了广泛的关注。然而，LLZO在室温下表现出不稳定性，容易从立方相（c-LLZO）转变为四方相（t-LLZO），导致离子电导率低等问题。本文研究了Ga掺杂对LLZO的影响。SEM、活化能、离子电导率和XRD细化分析结果表明，当x = 0.25时，Li7-3xGaxLa3Zr2O12具有较好的性能。固体核磁共振（SSNMR）结果表明，Ga0.25-LLZO有利于促进Li+的输运。此外，Li|[email protected]|Li对称电池比Li|Ag@Ga0-LLZO|Li和Li|[email protected]|Li具有更低的界面比阻抗（IASR）和更高的临界电流密度（CCD），并且在1300小时的稳定循环中稳定在0.15 mA/cm2。此外，全固态电池Li|[email protected]|LFP在0.2C下循环100次，容量保留率为82%，证明了其在锂电池中的应用前景。

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.