Abstract Nowadays SiO/C anode has been considered as the higher energy density energy storage candidate. However, the drastic material expansion and irreversible capacity fading in the prolonged cycling process limits its further application in many dynamic fields. In this article, 4, 5‑difluoro‑1, 3‑dioxolan‑2‑one (DFEC) is reported as a film forming additive to improve the electrochemical performance of LiNi0.8Co0.15Al0.05O2/SiO@C full cells. The cells with 2% DFEC keeps the best capacity retention of 88.7% after 500 cycles comparing to 83.9% of blank group. The main reason is that the deterioration of the SiO/C particle has been greatly alleviated. As for cyclic voltammograms and scanning electron microscopy measurement, DFEC is reduced over 1.5 V prior to the blank electrolyte in the first cycle, which indicates DFEC can participate in the formation of solid electrolyte interphase film on the anode surface. X-ray photoelectron spectroscopy results demonstrate that there are fewer side reaction products on the DFEC-contained anode.

中文翻译：

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4, 5-difluoro-1, 3-dioxolan-2-one 作为 LiNi0.8Co0.15Al0.05O2/SiO@C 全电池的成膜添加剂

摘要 如今，SiO/C 负极被认为是更高能量密度的储能候选材料。然而，长时间循环过程中剧烈的材料膨胀和不可逆的容量衰减限制了其在许多动态领域的进一步应用。在这篇文章中，4, 5-difluoro-1, 3-dioxolan-2-one (DFEC) 被报道为一种成膜添加剂，以改善 LiNi0.8Co0.15Al0.05O2/SiO@C 全电池的电化学性能。与空白组的 83.9% 相比，含 2% DFEC 的电池在 500 次循环后保持了 88.7% 的最佳容量保持率。主要原因是SiO/C颗粒的劣化得到了很大的缓解。对于循环伏安图和扫描电子显微镜测量，DFEC 在第一个循环中的空白电解质之前降低了 1.5 V 以上，这表明DFEC可以参与阳极表面固体电解质界面膜的形成。X 射线光电子能谱结果表明，含 DFEC 的阳极上的副反应产物较少。