As a new type of clean and efficient energy storage device, lithium-ion batteries have been widely used in electronic products, electric vehicles, and other fields, and the accompanying safety issues are of increasing concern. Therefore, solid-state lithium-ion conductors have become a current research hotspot. This paper used graphene oxide material to design and prepare LiAlTi(PO) solid electrolytes by the co-precipitation method and performed some relevant characterizations. The results showed that the addition of graphene oxide optimized the electrolyte structure improved the density of the powder, promoted grain growth, improved the transport path of lithium ions, and thus increased the total ionic conductivity. The optimal doping ratio was 0.5 wt%, and the total ionic conductivity reached the maximum of 2.42 × 10 S/cm. Compared to pure LiAlTi(PO), the ionic conductivity increased by 154% after using the graphene oxide. It is believed that larger grains, fewer grain boundaries, and denser microstructure resulted in a less distorted migration pathway for lithium ions. Under the influence of graphene oxide, LiAlTi(PO) exhibited better air stability than pure LiAlTi(PO) electrolyte. The electrolyte prepared in this study showed great application potential in all-solid-state batteries.

中文翻译：

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氧化石墨烯影响下Li1.3Al0.3Ti1.7(PO4)3离子电导率增强

锂离子电池作为一种新型清洁高效的储能装置，已广泛应用于电子产品、电动汽车等领域，随之而来的安全问题日益受到关注。因此，固态锂离子导体已成为当前的研究热点。本文采用氧化石墨烯材料，采用共沉淀法设计制备LiAlTi(PO)固体电解质，并进行了相关表征。结果表明，氧化石墨烯的添加优化了电解质结构，提高了粉末的密度，促进晶粒长大，改善了锂离子的传输路径，从而提高了总离子电导率。最佳掺杂比例为0.5 wt%，总离子电导率达到最大值2.42×10 S/cm。与纯LiAlTi(PO)相比，使用氧化石墨烯后离子电导率提高了154%。据信，较大的晶粒、较少的晶界和较致密的微观结构导致锂离子迁移路径的扭曲程度较小。在氧化石墨烯的影响下，LiAlTi(PO)电解质表现出比纯LiAlTi(PO)电解质更好的空气稳定性。本研究制备的电解质在全固态电池中显示出巨大的应用潜力。