Fluoride graphdiyne as a free-standing electrode displaying ultra-stable and extraordinary high Li storage performance

Abstract

Bottom-up fabrication of fluoride graphdiyne offers a versatile approach to the rational design of ultra-stable flexible 2D electrode materials.

Fluorination of MXene by Elemental F2 as Electrode Material for Lithium‐Ion Batteries

“…Duringt he chargep rocess, the Fi ons are close to the carbocation and thus will reconstruct the semi-ionic CÀF bonds. [11] The CV shows that fluorinated MXenem aterials have differente lectrochemical properties. In fact, the FMX3 sample shows the electrochemical signatures of TiF 3 ,w hich was shown to be presentb ym eans of XPS.…”

“…It was reported that during the discharge process, with the translation of C−F bonds from semi‐ionic to ionic, the F ions are bonded to Li ions through electrostatic interactions. During the charge process, the F ions are close to the carbocation and thus will reconstruct the semi‐ionic C−F bonds . The CV shows that fluorinated MXene materials have different electrochemical properties.…”

“…Given the presence of 2D layers, MXene has been widely studied for its electrochemical applications and specifically for LIBs as an intercalation pseudocapacitor electrode . However, owing to the compact atomic arrangement of MXene that would hinder the diffusion of Li + perpendicular to the layer plane, the electrodes have a reduced power density . To increase the power density of MXenes, Ma et al., for example, prepared hybrid 3D porous MXene/reduced graphene oxide films in which the 3D structure facilitates the diffusion of Li + .…”

“…[4][5][6][7][8][9][10] However,o wing to the compacta tomica rrangement of MXene that would hindert he diffusionofLi + perpendicular to the layer plane, the electrodes have areduced power density. [11] To increase the powerdensity of MXenes, Ma et al, [12] for example, prepared hybrid 3D porousM Xene/reduced graphene oxide films in which the 3D structure facilitates the diffusion of Li + .A nother possibility to enhancethe electrochemical performance of MXenee lectrodes is by changing their surfacef unctional groups:c alculations have shown that MXenes have at unable band gap controllable by changingt heir surface termination. [1,13] It was also demonstrated that post-etching annealing of MXenes in different gas environments resulted in changes in the surface termination, structure, and, thus, their electrochemical performance.…”

Dendrite‐Free Lithium Plating Induced by In Situ Transferring Protection Layer from Separator

“…Lithium ion batteries (LIBs) are becoming the most widely used energy storage devices owing to the relatively high energy density and low self‐discharge . Now, with endless pursuit of energy density, as exemplified by the cruise mileage of electric vehicles and the standby time of smartphones, the energy upgrade of cathode and anode materials is urgently required . Although the employment of high nickel oxide cathode and silicon–graphite composite anode has pushed the energy density of cells over the threshold of 300 Wh kg −1 , new chemistry is necessary for the next generation LIBs with an energy density over 300 Wh kg −1 .…”