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<p>LiTFSI, a lithium salt, has undergone extensive scrutiny in electrolyte research to enhance the performance of lithium-ion batteries, receiving widespread appreciation. In this study, we demonstrate how the use of LiTFSI as a salt-type additive effectively preserves the electrochemical properties of Li‖LiMn<sub>0.8</sub>Fe<sub>0.2</sub>PO<sub>4</sub> in full cells. Herein, the CF<sub>3</sub>SO<sub>2</sub><sup>−</sup> group within the TFSI<sup>−</sup>-anion demonstrates a significant electron absorption capacity which improves the dispersion of negative charges, reduces ion pairing, and enhances solubility. This characteristic enables the creation of a solid electrolyte interphase (SEI) abundant in inorganic nitrogen and sulfur on the electrode surface, thereby boosting the stability of the electrode/electrolyte interface and promoting efficient charge transfer at this boundary. The results illustrate that the addition of 0.5 wt% LiTFSI substantially improves the stability of the electrode/electrolyte interface in Li‖LiMn<sub>0.8</sub>Fe<sub>0.2</sub>PO<sub>4</sub> batteries. Following 600 cycles, the specific capacity attains 107.1 mAh g<sup>−1</sup> with a capacity retention of 86.02%, surpassing the base electrolyte’s retention of 61.24%. These results showcase outstanding electrochemical performance and exceptional cycling stability, confirming the potential of LiTFSI (lithium salts) as an electrolyte additive for upcoming high-energy density lithium batteries.</p>

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Construction of an inorganic sulfur- and fluorine-rich LiFe0.2Mn0.8PO4 cathode/electrolyte interface using electron-withdrawing anionic groups

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Xinggang Shan,
  • Liangliang Zeng,
  • Gangqiang Wang,
  • Ying Pan,
  • Guihuang Fang

摘要

LiTFSI, a lithium salt, has undergone extensive scrutiny in electrolyte research to enhance the performance of lithium-ion batteries, receiving widespread appreciation. In this study, we demonstrate how the use of LiTFSI as a salt-type additive effectively preserves the electrochemical properties of Li‖LiMn0.8Fe0.2PO4 in full cells. Herein, the CF3SO2− group within the TFSI−-anion demonstrates a significant electron absorption capacity which improves the dispersion of negative charges, reduces ion pairing, and enhances solubility. This characteristic enables the creation of a solid electrolyte interphase (SEI) abundant in inorganic nitrogen and sulfur on the electrode surface, thereby boosting the stability of the electrode/electrolyte interface and promoting efficient charge transfer at this boundary. The results illustrate that the addition of 0.5 wt% LiTFSI substantially improves the stability of the electrode/electrolyte interface in Li‖LiMn0.8Fe0.2PO4 batteries. Following 600 cycles, the specific capacity attains 107.1 mAh g−1 with a capacity retention of 86.02%, surpassing the base electrolyte’s retention of 61.24%. These results showcase outstanding electrochemical performance and exceptional cycling stability, confirming the potential of LiTFSI (lithium salts) as an electrolyte additive for upcoming high-energy density lithium batteries.