The layered double hydroxide (LDH) is a kind of natural mineral, which can also be manually prepared. It has been practically applied in various fields due to its unique crystal structure and diversity of composition, size, and morphology. In this work, LDHs with different chemical compositions (Co²⁺, Mg²⁺, Zn²⁺, and Ni²⁺) and topographical features (flower-like, spherical, and plate-like) were successfully prepared by controlling the reaction conditions. Then, they were mechanically dispersed into base grease and their tribological properties were evaluated by a ball-on-disk tester under a contact pressure of 2.47 GPa. It was found that the variation of morphology, instead of chemical composition, had great influence on the tribological performance. The “flower-like” LDH sample with high specific surface area (139 m²/g) was demonstrated to show the best performance. With 1 wt% additive, the wear volume was only about 0.2% of that lubricated by base grease. The tribofilm with unique microscopic structure and uniform composition was derived from tribochemical reaction between LDH additives and sliding solid surfaces, effectively improving tribological properties of the lubrication system. This work provided the guidance for optimizing lubricant additives and held great potential in future applications.

层状双氢氧化物（LDH）是一种天然矿物，也可以手动制备。由于其独特的晶体结构以及组成，尺寸和形态的多样性，它已实际应用于各种领域。在这项工作中，具有不同化学成分（Co 2 ⁺，Mg 2 ⁺，Zn ²⁺和Ni ²⁺）和形貌特征（花状，球形和板状）已通过控制反应条件成功制备。然后，将它们机械分散在基础润滑脂中，并在2.47 GPa的接触压力下通过圆盘球测试仪评估其摩擦性能。发现形态的变化而不是化学组成对摩擦性能有很大的影响。具有高比表面积（139 m ^2）的“花状” LDH样品/ g）显示出最佳性能。添加剂为1 wt％时，磨损量仅为基础润滑脂润滑量的约0.2％。LDH添加剂与滑动固体表面之间的摩擦化学反应衍生出具有独特的微观结构和均匀组成的摩擦膜，有效地改善了润滑系统的摩擦学性能。这项工作为优化润滑油添加剂提供了指导，并在未来的应用中具有巨大的潜力。