Li-rich layered oxides (LLO) feature high delivery capacity are considered the most promising cathodes for the next-generation high-energy–density battery systems. Unfortunately, the LLO cathode suffers from poor cycling stability and fast voltage fading because of structural failure and unstable electrode/electrolyte interphase. Herein, we propose 2,4,6-trimethoxyboroxine (TMBX) as an effective electrolyte additive for enhancing the specific capacity and service life of LLO cathode. Impressively, the LLO/Li cell with 1 wt% TMBX exhibits a specific capacity of 226.3 mAh/g with a considerable cycling retention of 96.1% at 0.5 C after 200 cycles, while the capacity of the baseline cell is only 133.8 mAh/g and the cycling retention is less than 60%. Even at 1 C, the cell using TMBX additive still sustains a capacity retention of as high as 91.1% after 400 cycles. The cell with excellent performance is attributed to TMBX additive which can form a uniform, robust, and boron-rich interface film on both the cathode and anode surfaces simultaneously. Structural characterization and mechanism analysis reveal that TMBX additive can effectively eliminate HF hydrolysis from LiPF₆, alleviate the loss of transition metal ions, maintain the integrity of crystal structure and improve the interfacial charge transfer.

富锂层状氧化物（LLO）具有高传输容量，被认为是下一代高能量密度电池系统最有前途的正极材料。不幸的是，由于结构故障和不稳定的电极/电解质界面，LLO 阴极的循环稳定性差和电压衰减快。在此，我们提出 2,4,6-三甲氧基环硼氧烷 (TMBX) 作为一种有效的电解质添加剂，以提高 LLO 正极的比容量和使用寿命。令人印象深刻的是，含 1 wt% TMBX 的 LLO/Li 电池的比容量为 226.3 mAh/g，200 次循环后在 0.5 C 下的循环保持率为 96.1%，而基准电池的容量仅为 133.8 mAh/g 和循环保持率小于60%。即使在 1 C 时，使用 TMBX 添加剂的电池仍能保持高达 91 的容量保持率。400 次循环后 1%。电池具有优异的性能归功于TMBX添加剂，它可以同时在阴极和阳极表面形成均匀、坚固且富含硼的界面膜。结构表征和机理分析表明，TMBX添加剂可以有效消除LiPF中的HF水解₆、减轻过渡金属离子的损失，保持晶体结构的完整性，改善界面电荷转移。