Properties of poly (4-nitro)triphenylamine-thiophene Composite based Cathode Material for Rechargeable Lithium-ion Battery

A triphenylamine-based conjugated polymer (PTPA-NO2)-PTH poly[4-(nitro)triphenylamine-thiophene] with multiple active polymerization sites has been prepared as the cathode material. First, the crystal phase structure, surface morphology and element states were characterized by XRD, SEM and XPS in turn, the dispersed porous arthicstructure supply a rich electrochemical interface and ion channels to improve its electrode reactivity. By calculating the energy level of HOMO and LUMO orbitals, we find that the conductivity and conjugation ability are enhanced. Then the electrochemical charge and discharge performance, CV and EIS of the battery were also tested, because of the nitro electron-absorbing functional unit are introduced in the triphenylamine skeleton, the copolymer perform a reversible specific capacity of 772.4 mAh/g with two significant charge-discharge voltage platforms under different reaction mechanisms after 500 cycling, even when the current density is 1600mA/g, this composite material still maintain a high capacity of 550mAh/g with the efficiency ≥99%.