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Constructing a stable interface by 2,4,6-trimethoxyboroxine as an electrolyte additive for Li-rich layered oxide cathode under high voltage
Journal of Electroanalytical Chemistry ( IF 4.1 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.jelechem.2021.115682
Hai Zhu 1, 2 , Yaling Zhang 1 , Mingyang Li 1 , Jinhua Luo 1 , Weifeng Wei 2 , Shiying Zhang 1
Affiliation  

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.



中文翻译:

2,4,6-三甲氧基环硼氧烷作为高电压下富锂层状氧化物正极的电解质添加剂构建稳定界面

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。

更新日期:2021-09-13
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