Gel interface for garnet-based lithium metal batteries with high loading cathode

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2024-11-19 DOI:10.1016/j.matlet.2024.137729

Cheng Ouyang , Shaoping Wu , Guoyao Li , Nan Zhang , Qiwen Chen , Rongzi Zhang , Haidong Sun , Chenglan Zhang , Hezhou Liu , Huanan Duan

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Abstract

Garnet-type electrolytes are ideal for lithium-metal batteries due to their high ionic conductivity and electrochemical stability. However, high interfacial resistance caused by poor contact with electrodes remains a challenge. To address this, we developed a flexible gel interlayer via in-situ polymerization to improve interface contact and reduce impedance. Additionally, a thick cathode with a laser-drilled channel structure was constructed to enhance gel electrolyte penetration and discharge capacity. Consequently, the Li/GEL-LLZTO-GEL/Li symmetric cell achieved a critical current density of 1.5 mA cm⁻² and a reduced interfacial resistance of 134 O at room temperature. The quasi-solid half-cell with the laser-drilled cathode maintained a discharge capacity of 132.4 mAh/g with an active material loading of 13.1 mg cm⁻² after 100 cycles. This work provides a simple and effective method for manufacturing safe and stable lithium metal batteries.

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石榴石基高负载正极锂金属电池的凝胶界面

石榴石型电解质具有高离子传导性和电化学稳定性，是锂金属电池的理想选择。然而，与电极接触不良导致的高界面电阻仍然是一个挑战。为了解决这个问题，我们通过原位聚合开发了一种柔性凝胶中间膜，以改善界面接触并降低阻抗。此外，我们还构建了具有激光钻孔通道结构的厚阴极，以增强凝胶电解质的渗透性和放电能力。因此，Li/GEL-LLZTO-GEL/Li 对称电池在室温下的临界电流密度达到了 1.5 mA cm-2，界面电阻降低到了 134 O。使用激光钻孔阴极的准固体半电池在经过 100 次循环后，在活性材料负载为 13.1 mg cm-2 的情况下仍能保持 132.4 mAh/g 的放电容量。这项工作为制造安全稳定的锂金属电池提供了一种简单有效的方法。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive