Li4Ti5O12 Modification by Bifunctional Bionic Membrane as Anode Materials for Lithium-ion Batteries

Anode material with excellent electrochemical properties was obtained by coating the polydopamine (PDA)/Super P(SP) layer with the dual effect of both ionic conduction and electronic conduction on the surface of Li4Ti5O12 particles. The morphology, structure and electrochemical properties of the composites were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(SEM), transmission electron microscopy(TEM), charge-discharge cycle curves, and cyclic voltammetry(CV). The results showed that when the thickness of the coating layer was controlled at about 10 nm and the content of Super P was 3%(mass fraction), the sample displayed an outstanding electrochemical performance: the initial discharge capacity is 175 mA.h/g at 0.2C and the reversible discharge capacity is still above 160 mA.h/g after 150 cycles.