Vertically Fluorinated Graphene Encapsulated SiOx Anode for Enhanced Li+ Transport and Interfacial Stability in High‐Energy‐Density Lithium Batteries

• Published in: Angewandte Chemie International Edition Vol. 63; no. 47; pp. e202413600 - n/a
• Main Authors: 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
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 18.11.2024
• Edition: International ed. in English
• Subjects: Electrode materials; Electrodes; Energy conversion; Fluorination; Fluorine; Graphene; Lithium; Lithium batteries; Lithium-ion batteries; lithium-ion battery; SiOx anode; solid electrolyte interphases; Solid electrolytes; Storage systems; surface fluorinated graphene
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.202413600

Achieving high energy density has always been the goal of lithium‐ion batteries (LIBs). SiOx 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 SiOx (SiOx@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 SiOx@vG−F anode, which effectively suppresses the pulverization of microsized SiOx particles during the charge and discharge cycle. As a result, the SiOx@vG−F enabled a higher capacity retention of 86.4 % over 200 cycles at 1.0 C in the SiOx@vG−F||LiNi0.8Co0.1Mn0.1O2 full cell. This approach will provide insights for the advancement of alternative electrode materials in diverse energy conversion and storage systems. A vertically fluorinated graphene encapsulated SiOx anode with ultra‐fast Li+ transfer and interfacial stability for high‐energy‐density lithium batteries was developed. The results demonstrate the effectiveness of surface fluorination for the construction of LiF‐rich solid electrolyte interfaces.