A rapid pressureless sintering strategy for LLZTO ceramic solid electrolyte sheets prepared by tape casting

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2024-09-28 DOI:10.1016/j.ssi.2024.116708

Heng Pan, Lingcong Fan, Yongxi Zhang, Lei Zhang, Ying Shi, Jianjun Xie, Fang Lei

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引用次数: 0

Abstract

Garnet-type electrolytes are regarded as one of the most promising solid-state electrolytes (SSEs) for lithium-ion batteries due to their potential advantages in terms of energy density, electrochemical stability and safety. To achieve the maximum energy density, it is necessary to ensure that the electrolyte layer is as thin as possible. Nevertheless, thin sheet SSE is more challenging to sinter than pellet due to the greater lithium volatilization from the high surface/volume ratio. Garnet-type SSE (Li_6.5La₃Zr_1.5Ta_0.5O₁₂, LLZTO) green tape was prepared by the tape-casting technique. The effects of supporter, sintering temperature and dwell time on the relative density, microstructure and ionic conductivity of thin sheet were investigated. A ceramic SSE sheet with a thickness of 173 μm, a relative density of 97.2 %, an ionic conductivity of 2.02 × 10⁻⁴ S/cm at 25 °C and an activation energy of 0.25 eV, was achieved using a rapid pressureless sintering at 1250 °C for 25 min with a MgO supporter. This work offers insights into the practical production of LLZTO sheets.

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胶带浇铸法制备 LLZTO 陶瓷固体电解质片的快速无压烧结策略

石榴石型电解质因其在能量密度、电化学稳定性和安全性方面的潜在优势，被视为最有前途的锂离子电池固态电解质（SSE）之一。为了达到最大能量密度，必须确保电解质层尽可能薄。然而，由于高表面/体积比会导致更多的锂挥发，薄片 SSE 比颗粒烧结更具挑战性。采用铸带技术制备了石榴石型 SSE（Li6.5La3Zr1.5Ta0.5O12，LLZTO）绿色带材。研究了抑制剂、烧结温度和停留时间对薄片相对密度、微观结构和离子电导率的影响。在氧化镁支撑剂的作用下，在 1250 °C 下快速无压烧结 25 分钟，制备出了厚度为 173 μm、相对密度为 97.2 %、离子电导率为 2.02 × 10-4 S/cm（25 °C）、活化能为 0.25 eV 的 SSE 陶瓷薄片。这项工作为 LLZTO 片材的实际生产提供了启示。

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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.