Modulating C─F Bonds of Fluorinated Graphite via Compounding Graphene Oxide for High‐Energy/Power Lithium Batteries

ABSTRACT Lithium/fluorinated carbon (Li/CF _x ) primary batteries have been widely used in industries such as aerospace and military. However, due to its tight structure and strong C─F bond, high energy density and power density cannot be balanced. Herein, an environmentally friendly and scalable liquid‐phase exfoliation strategy to modify fluorinated graphite (FG) with graphene oxide (GO) has been proposed. The optimized GO‐FG composite, featuring as exfoliated layer structure and a modulated C─F bond, realizes a maximum energy density of 2740.00 Wh kg ⁻¹ at 0.01 C, and a power density of 84.88 and 119.33 kW kg ^{− 1} at ultra‐high rates of 50 C and 80 C, respectively. Furthermore, flexible pouch cells assembled with this composite deliver capacities of 1.06 Ah at 0.1 C and 0.96 Ah at 5 C. Experimental and theoretical results indicate that the compounding of reduced GO with FG significantly modulates the strength of C─F bond and the in situ exfoliation opens the layer structure of CF _x and constructs the conductive framework, which realizes a uniform LiF transformation and structure collapse of CF _x during discharging, synergistically enhanced the reaction kinetics.