PEO-ZnO缓冲层对Li|LATP界面稳定性的研究
Study on the Stability of Li|LATP Interface by PEO-ZnO Buffer Layer
摘要: 钠超离子导体(NASICON)型Li1.3Al0.3Ti1.7(PO4)3 (LATP)由于其高的锂离子电导率、对空气的高稳定性和低成本而成为最有前途的固态电解质之一。然而，由于其与锂金属的高度不相容性，LATP的应用并不广泛。在此，提出了一种简单且方便的涂层方法在LATP上构建氧化锌聚合物电解质层(PEO-ZnO|LATP)，除了保护LATP外，该界面PEO-ZnO层还能够提高Li离子迁移数，降低Li|LATP界面阻抗，与PEO|LATP相比，引入1 wt.% ZnO的Li|PEO-1ZnO|LATP|PEO-1ZnO|Li对称电池在0.1 mA∙cm−2电流密度下能够稳定循环700 h，而Li|PEO|LATP|PEO|Li对称电池在0.1 mA∙cm−2电流密度下仅循环520 h。组装的全电池LiFePO4|LATP|PEO-1ZnO|Li固态电池在0.1 C倍率下提供154.3 mAh∙g−1的比容量，200圈循环后容量保持率为87%。本研究提供了一种简便的涂层策略来解决Li|LATP界面副反应问题，并开辟了在固态锂金属电池中应用的可能性。
Abstract: Sodium superionic conductor (NASICON) type Li1.3Al0.3Ti1.7(PO4)3 (LATP) is one of the most promising solid-state electrolytes due to its high lithium ion conductivity, high stability to air and low cost. However, LATP is not widely used due to its high incompatibility with lithium metal. Herein, a simple and convenient coating method is proposed to construct a zinc oxide polymer electrolyte layer (PEO-ZnO|LATP) on LATP. In addition to protecting LATP, this interfacial PEO-ZnO layer is able to increase the Li-ion mobility number and reduce the Li|LATP interfacial impedance, and compared with PEO|LATP, the introduction of a 1 wt.% ZnO Li|PEO-1ZnO|LATP|PEO-1ZnO|Li symmetric cell with the introduction of 1 wt.% ZnO is able to cycle stably for 700 h at a current density of 0.1 mA∙cm−2, while the Li|PEO|LATP|PEO|Li symmetric cell only cycles for 520 h at a current density of 0.1 mA∙cm−2. The assembled full-cell LiFePO4|LATP|PEO-1ZnO|Li solid-state cell provides a specific capacity of 154.3 mAh∙g−1 at 0.1 C multiplication with 87% capacity retention after 200 cycles. This study provides a facile coating strategy to solve the Li|LATP interfacial side reaction problem and opens up the possibility of application in solid-state lithium metal batteries.
文章引用：张雯婷, 刘圣奇, 杨晨, 张真硕, 刘争. PEO-ZnO缓冲层对Li|LATP界面稳定性的研究[J]. 材料科学, 2024, 14(5): 730-737. https://doi.org/10.12677/ms.2024.145080

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