Lithium dendrite growth has long been regarded as the main obstacle for the practical usage of lithium metal battery. In this paper, we heat-treat the copper collector at a low temperature to prepare a Cu_xO (x = 1–2)/Cu composite electrode. The samples heat-treated at 250 °C are mainly composed of Cu₂O confirmed by X-ray photoelectron spectroscopy (XPS) analysis, which has the best wettability with propylene carbonate (PC)-based electrolyte. The as-prepared Li–Cu cell (composite electrode) can run more than 150 cycles. However, boric acid additive can prolong the cycle number of Li–Cu cell to more than 300 cycles at a current density of 0.5 mA cm⁻² with a Coulombic efficiency larger than 85%. Scanning electron microscopy (SEM) image shows that the Cu₂O/Cu composite electrode with boric acid additive in the electrolyte can inhibit the formation of lithium dendrite on the surface of the electrode, and a uniform and dense nano-columnar lithium layer can be obtained even at 5 mA cm⁻². The synergistic effect is attributed to the improved interfacial properties for Cu₂O/Cu composite collectors when boric acid (BA) is used as additives.

锂枝晶的生长长期以来一直被认为是锂金属电池实际使用的主要障碍。在本文中，我们在低温下对集电极进行热处理，以制备Cu _x O（x = 1-2）/ Cu复合电极。经X射线光电子能谱（XPS）分析确认，在250°C热处理的样品主要由Cu ₂ O组成，该样品在基于碳酸亚丙酯（PC）的电解液中具有最佳润湿性。制备好的Li-Cu电池（复合电极）可以运行150个以上的循环。但是，硼酸添加剂可以在0.5 mA cm ^-2的电流密度下将Li-Cu电池的循环次数延长至300个循环以上，库仑效率大于85％。扫描电子显微镜（SEM）图像显示铜在电解质中添加硼酸的₂ O / Cu复合电极可以抑制在电极表面形成锂枝晶，即使在5mA cm ^-2时也可以得到均匀且致密的纳米柱状锂层。当使用硼酸（BA）作为添加剂时，协同作用归因于Cu ₂ O / Cu复合捕集剂的界面性能得到改善。