Rational synthesis of Ni3(HCOO)6/CNTs ellipsoids for enhanced lithium storage performance:Inspired by the time evolution of the growth process of nickel formate framework
Metal-organic frameworks (MOFs) as novel electrode materials have attracted intensive attention, however, low electronic conductivity hinders their practical application in lithium ion batteries (LIBs). This work reports the synthesis of conductive MOF/CNTs composite with enhanced electrochemical reactivity. The growth mechanism of the pristine MOF and the correlations of two components are investigated from the viewpoint of crystal engineering. The time dependent morphology evolution experiment reveals that [Ni3(HCOO)6] undergoes an ‘aggregation-based nucleation-growth’ mechanism. As a result, [Ni3(HCOO)6]/CNTs microsized ellipsoidal particles are controllably synthesized by tuning the reaction time and the regent concentration, where CNTs penetrate the entire particles thoroughly. The obtained [Ni3(HCOO)6]/CNTs composites exhibit significantly enhanced electrochemical activity in comparison with the as-synthesized pristine [Ni3(HCOO)6]. This is ascribed to the effective 3D conductive network constructed by CNTs. Our results provide an effectively synthetic strategy to construct conductive MOFs/CNTs composites, which pave the way for developing other conductive MOFs for electrode materials.