Unstable solid electrolyte interphase between lithium metal and electrolyte results in low coulombic efficiency and limited cycle life, which hinder the utility of lithium metal anode. Besides, how to settle the cathode material corrosion in practical lithium metal batteries is also a key challenge. Here, lithium 2 trifluoromethyl-4,5-dicyanoimidazolide (C₆F₃LiN₄) is reported as valid electrolyte additive for bi-electrode protective films formation in practical Li metal-based batteries. The C₆F₃LiN₄ plays distinct functions in bi-electrode interface, it attributes to robust F, N-rich polymer interphase layer on the cathode which effectively protect the cathode from deterioration. And it promotes the even distribution of LiF and polycarbonate species on anode and prevent the formation of Li dendrites. The symmetric cell of C₆F₃LiN₄ exhibits stable cycling performance with 1 mA cm⁻² (700 h). In addition, the improvement in the Li metal deposition uniformity has been confirmed by atomic force microscope and simulation. Benefiting from the synergistic enhanced stability and uniformity of electrode interphase, the LiNi_0.5Co_0.2Mn_0.3O₂ || Li metal battery with C₆F₃LiN₄ can maintain high capacity retention of 82.6% after 400 cycles. Importantly, the Li metal pouch battery pairing high-loading cathode (16.12 mg cm⁻²) also deliver longer cycle life, validating its feasibility in practical applications.

锂金属和电解质之间不稳定的固体电解质界面导致库仑效率低和循环寿命有限，阻碍了锂金属负极的应用。此外，如何解决实际锂金属电池正极材料腐蚀也是一个关键挑战。在这里，据报道，2 三氟甲基-4,5-二氰基咪唑锂（C ₆ F ₃ LiN ₄）可作为有效的电解质添加剂，用于在实际锂金属基电池中形成双电极保护膜。C ₆ F ₃ LiN ₄在双电极界面中发挥着独特的作用，这归功于阴极上坚固的富氟、富氮聚合物界面层，有效地保护了阴极免受劣化。并且它促进了 LiF 和聚碳酸酯物质在阳极上的均匀分布，并防止了锂枝晶的形成。C ₆ F ₃ LiN ₄对称电池在1 mA cm ^-2 (700 h) 下表现出稳定的循环性能。此外，原子力显微镜和模拟证实了锂金属沉积均匀性的改善。受益于电极中间相的协同增强稳定性和均匀性，LiNi _0.5 Co _0.2 Mn _0.3 O ₂|| C ₆ F ₃ LiN ₄锂金属电池在400次循环后可保持82.6%的高容量保持率。重要的是，锂金属软包电池配对高负载阴极（16.12 mg cm ^-2）还具有更长的循环寿命，验证了其在实际应用中的可行性。