Fluoroethylene carbonate (FEC) is an important electrolyte additive in silicon (Si) anodes. However, it is easily defluorinated by Lewis acids (PF₅⁻) to form harmful corrosive substances (HF). To overcome this problem, 1-Hydroxyethylidene-1, 1-diphosphonic acid (HEDP), a novel multifunctional surface modifier is developed on the Si surface. It can not only consume HF, but also participate in the formation of a solid electrolyte interphase (SEI) film with excellent electrochemical stability, high lithium conductivity, and good thermal stability. In addition, Si@HEDP anode with polyvinylidene fluoride (PVDF) binder exhibits much improved electrochemical performance. After 500 cycles at 30 °C, a high reversible capacity of 1831.8 mAh g ^{− 1} is obtained; and after 200 cycles at 60 °C, it still maintains 2163.8 mAh g ^{− 1}; which are in sharp contrast to the reference Si anode of almost zero capacity after 25 cycles. This work overcomes the fundamental challenges of using FEC electrolyte additive and PVDF binder in Si-based batteries.

氟代碳酸亚乙酯 (FEC) 是硅 (Si) 阳极中重要的电解质添加剂。然而，它很容易被路易斯酸（PF ₅ ^-）脱氟形成有害的腐蚀性物质（HF）。为了克服这个问题，在硅表面上开发了一种新型的多功能表面改性剂 1-Hydroxyethylidene-1, 1-diphosphonic acid (HEDP)。它不仅可以消耗HF，还可以参与形成具有优异电化学稳定性、高锂电导率和良好热稳定性的固体电解质界面（SEI）膜。此外，带有聚偏二氟乙烯 (PVDF) 粘合剂的 Si@HEDP 阳极表现出大大改善的电化学性能。在 30 °C 下循环 500 次后，可逆容量高达 1831.8 mAh g ^{− 1}获得；在60°C下循环200次后，仍保持2163.8 mAh g ^{− 1}；这与 25 次循环后容量几乎为零的参考硅负极形成鲜明对比。这项工作克服了在硅基电池中使用 FEC 电解质添加剂和 PVDF 粘合剂的基本挑战。