Dual-ion batteries (DIBs), well-known for the high-rate capability of the graphite cathode, urgently need a suitable anode material to realize their high power density in practical applications. In that respect, Li₄Ti₅O₁₂ (LTO), which can be cycled at high rates for thousands of cycles, can be a good candidate. However, a facile method to stabilize the graphite||LTO full cells is necessary. Herein, we introduce LiDFOB additive into the electrolyte of graphite||LTO cells, which drastically improves the cycling performance and reduces self-discharge of the DIBs. Specifically, by adding 1.0 wt% LiDFOB to 2 M LiPF₆ in fluorinated ethyl methyl carbonate, graphite||LTO DIBs can maintain stable charge-discharge for over 8000 cycles at 20 C. Characterizations indicate that LiDFOB forms a robust LiF-rich solid electrolyte interphase (SEI) on the LTO anode to suppress side reactions such as electrolyte decomposition and gas generation.

双离子电池（DIB）以石墨正极的高倍率性能而闻名，在实际应用中迫切需要合适的负极材料来实现其高功率密度。在这方面，Li ₄ Ti ₅ O ₁₂ (LTO) 可以以高速率循环数千次，可能是一个很好的候选者。然而，需要一种简便的方法来稳定石墨||LTO全电池。在这里，我们将LiDFOB添加剂引入到石墨||LTO电池的电解质中，这极大地提高了循环性能并减少了DIB的自放电。具体来说，通过在氟化碳酸甲乙酯中的 2 M LiPF ₆ 中添加 1.0 wt% LiDFOB，石墨||LTO DIB 可以在 20 C 下保持稳定的充放电超过 8000 次循环。表征表明 LiDFOB 形成LTO 阳极上具有坚固的富含 LiF 的固体电解质中间相 (SEI)，可抑制电解质分解和气体产生等副反应。