Vertically Fluorinated Graphene Encapsulated SiO<sub>x</sub> Anode for Enhanced Li<sup>+</sup> Transport and Interfacial Stability in High‐Energy‐Density Lithium Batteries
Lin‐Bo Huang, Lu Zhao, Z.Y. Ma, Xing Zhang, Xusheng Zhang, Zhuo‐Ya Lu, Ge Li, Xiaoxi Luo, Rui Wen, Sen Xin, Qinghai Meng, Qinghai Meng, Yu‐Guo Guo
Abstract
Abstract Achieving high energy density has always been the goal of lithium‐ion batteries (LIBs). SiO x 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 x (SiO x @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 x @vG−F anode, which effectively suppresses the pulverization of microsized SiO x particles during the charge and discharge cycle. As a result, the SiO x @vG−F enabled a higher capacity retention of 86.4 % over 200 cycles at 1.0 C in the SiO x @vG−F||LiNi 0.8 Co 0.1 Mn 0.1 O 2 full cell. This approach will provide insights for the advancement of alternative electrode materials in diverse energy conversion and storage systems.