An insoluble naphthalenediimide derivative as a highly stable cathode material for lithium-ion batteries

A new naphthalenediimide derivative, 2, 7-di (1, 2, 4-triazolyl) benzophenanthroline-tetraone (3-DTBPT) is synthesized by the condensation reaction of 1, 4, 5, 8-naphthalenetetracarboxylic anhydride (NTCDA) and 3-amino-1, 2, 4-triazole (3-AT). The 3-DTBPT material is characterized by Fourier transform infrared spectrum, X-ray diffraction, thermogravimetric analysis, solid state NMR spectra, field emission scanning electron microscopy, elemental analysis and Brunauer-Emmett-Teller surface. 3-DTBPT is insoluble in organic electrolyte. When used as a cathode material of lithium-ion batteries, 3-DTBPT exhibits an excellent cyclic stability, keeping a specific capacity of 110 mA h g(-1) and a nearly 94.8% capacity retention after 50 cycles at 50 mA g(-1). Our work provides an effective route for overcoming the dissolution problem of organic electrode materials and obtains a potential material for the long-cycle-life and flexible organic rechargeable batteries.