Wang Zhongming, He Zhiyuan, Wang Zhongsheng, Long Kecheng, Yang Jixu, Huang Shaozhen, Wu Zhibin, Mei Lin, Chen Libao
State Key Laboratory of Powder Metallurgy, Central South University Changsha 410083 P. R. China
School of Materials Science and Engineering, Xiangtan University Xiangtan Hunan 411105 China.
Chem Sci. 2025 Jan 16;16(8):3571-3579. doi: 10.1039/d4sc07916g. eCollection 2025 Feb 19.
In overcoming the barrier of rapid Li transfer in lithium-ion batteries at extreme temperatures, the desolvation process and interfacial charge transport play critical roles. However, tuning the solvation structure and designing a kinetically stable electrode-electrolyte interface to achieve high-rate charging and discharging remain a challenge. Here, a lithium nonafluoro-1-butanesulfonate (NFSALi) additive is introduced to optimize stability and the robust solid electrolyte interface film (SEI), realizing a rapid Li transfer process and the structural integrity of electrode materials. The NFSALi-derived thinner, fluorine-rich, and sulfur-containing SEI in nitrile-assisted carbonate electrolytes effectively suppresses the decomposition of valeronitrile solvent during high-rate cycling and wide-temperature operation (-40-55 °C). More importantly, the graphite‖LiNiCoMnO pouch cell demonstrates a capacity retention of 66.88% after 200 high-rate cycles with 3C charging and 5C discharging under a high-temperature condition of 55 °C. This work provides significant guidance to develop inorganic-rich interfacial chemistry for lithium-ion batteries under extreme operating conditions.
在克服锂离子电池在极端温度下快速锂传输的障碍方面，去溶剂化过程和界面电荷传输起着关键作用。然而，调整溶剂化结构并设计动力学稳定的电极-电解质界面以实现高倍率充放电仍然是一项挑战。在此，引入了一种九氟-1-丁烷磺酸锂（NFSALi）添加剂来优化稳定性和坚固的固体电解质界面膜（SEI），实现快速的锂传输过程以及电极材料的结构完整性。在腈辅助的碳酸盐电解质中，由NFSALi衍生出的更薄、富含氟且含硫的SEI有效地抑制了在高倍率循环和宽温度操作（-40至55°C）期间戊腈溶剂的分解。更重要的是，石墨‖LiNiCoMnO软包电池在55°C的高温条件下，以3C充电和5C放电进行200次高倍率循环后，容量保持率为66.88%。这项工作为在极端操作条件下开发用于锂离子电池的富无机界面化学提供了重要指导。
