Nitrogen-doped carbon dots@COFBTH-TT composite for high-performance lithium ions battery anode

Herein, a novel hollow rod-like composite was obtained by doping nitrogen-doped carbon quantum dots (NCDs) into covalent organic frameworks (COFs) (NCDs@COF BTH−TT ) by a one-pot hydrothermal method. Such a hollow structure not only facilitates the transport of Li + , but also exposes a large number of active sites. The doped NCDs improves the electrical conductivity of NCDs@COF BTH−TT . When NCDs@COF BTH−TT was applied as the anode materials of lithium-ion batteries (LIBs), it showed excellent Li-storage performance. At a current density of 0.2 A g − 1 , the NCDs@COF BTH−TT exhibited an initial capacity of 336.8 mAh g − 1 and then stabilized at 210.7 mAh g − 1 after 226 charge/discharge cycles. This work combines zero-dimensional NCDs with two-dimensional COFs to improve the electrical conductivity and π-π stacking interaction of COFs, which is of great significance for the construction of COFs-based LIBs with high storage capacity and ultra-long cycle life.