Huang Lin-Bo, Zhao Lu, Ma Zhi-Feng, Zhang Xing, Zhang Xu-Sheng, Lu Zhuo-Ya, Li Ge, Luo Xiao-Xi, Wen Rui, Xin Sen, Meng Qinghai, Guo Yu-Guo
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, P. R. China.
Angew Chem Int Ed Engl. 2024 Nov 18;63(47):e202413600. doi: 10.1002/anie.202413600. Epub 2024 Oct 14.
Achieving high energy density has always been the goal of lithium-ion batteries (LIBs). SiO has emerged as a compelling candidate for use as a negative electrode material due to its remarkable capacity. However, the huge volume expansion and the unstable electrode interface during (de)lithiation, hinder its further development. Herein, we report a facile strategy for the synthesis of surface fluorinated SiO (SiO@vG-F), and investigate their influences on battery performance. Systematic experiments investigations indicate that the reaction between Li and fluorine groups promotes the in situ formation of stable LiF-rich solid electrolyte interface (SEI) on the surface of SiO@vG-F anode, which effectively suppresses the pulverization of microsized SiO particles during the charge and discharge cycle. As a result, the SiO@vG-F enabled a higher capacity retention of 86.4 % over 200 cycles at 1.0 C in the SiO@vG-F||LiNiCoMnO full cell. This approach will provide insights for the advancement of alternative electrode materials in diverse energy conversion and storage systems.
实现高能量密度一直是锂离子电池（LIBs）的目标。由于其显著的容量，SiO已成为一种极具吸引力的负极材料候选物。然而，在（脱）锂过程中巨大的体积膨胀和不稳定的电极界面阻碍了其进一步发展。在此，我们报道了一种合成表面氟化SiO（SiO@vG-F）的简便策略，并研究了它们对电池性能的影响。系统的实验研究表明，Li与氟基团之间的反应促进了在SiO@vG-F阳极表面原位形成富含LiF的稳定固体电解质界面（SEI），这有效地抑制了微米级SiO颗粒在充放电循环过程中的粉碎。结果，在SiO@vG-F||LiNiCoMnO全电池中，SiO@vG-F在1.0 C下200次循环中实现了86.4%的更高容量保持率。这种方法将为各种能量转换和存储系统中替代电极材料的发展提供见解。
