In this work, an electrolyte optimization strategy is proposed for simultaneously stabilizing the two-sided interfaces in the LiNiCoMnO (NCM)/Si-C batteries by employing a multifunctional additive, 4-fluorophenylboronic anhydride (TFTB). It is revealed that the TFTB is capable of scavenging the trace amount of moisture and HF acidic species in the electrolyte by strongly coordinating with them, meanwhile, possesses preferential reduction/oxidation sequence in contrast to conventional carbonate solvents. Profited from these synergistic effects from the additive, favorable interface chemistry can be simultaneously built on both Si-C anode and NCM cathode accompanied by greatly suppressed electrolyte degradation, which not only well accommodates the volume change of the Si-C anode during cycling, but also effectively protects the NCM cathode from structural destruction. Consequently, the addition of the TFTB endows the NCM/Si-C full cell with improved reversible capacity and cycle performance.

中文翻译：

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4-氟苯基硼酸酐作为高性能锂离子电池的杂质清除剂和双面界面改性剂


在这项工作中，提出了一种电解质优化策略，通过使用多功能添加剂4-氟苯基硼酸酐（TFTB）来同时稳定LiNiCoMnO（NCM）/Si-C电池中的两侧界面。研究表明，TFTB 能够通过与电解液中的微量水分和 HF 酸性物质强配位来清除它们，同时与传统碳酸酯溶剂相比，具有优先的还原/氧化顺序。得益于添加剂的协同效应，可以在 Si-C 阳极和 NCM 阴极上同时建立良好的界面化学，同时大大抑制电解质降解，这不仅很好地适应了 Si-C 阳极在循环过程中的体积变化，而且还有效保护NCM阴极免受结构破坏。因此，TFTB的添加赋予NCM/Si-C全电池改善的可逆容量和循环性能。