PEDOT modified LiNi1/3Co1/3Mn1/3O2 with enhanced electrochemical performance for lithium ion batteries

Layered LiNi1/3Co1/3Mn1/3O2 was modified by poly(3,4-dioxyethylenethiophene) PEDOT via a facile method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and infrared spectroscopy (IR). PEDOT modified samples exhibited both improved rate and cycle performance compared with the pristine LiNii/sColisMni/302. At a charge/ discharge current of 1500 mA g(-1), the discharge capacity was improved from 443 to 73.9 mAh g(-1). The sample with 2 wt% and heat treated at 300 degrees C showed the optimized electrochemical performance. Galvanostatic intermittent titration technique (GITI) and cyclic voltammetry (CV) results indicated that the battery polarization of coated samples have been suppressed obviously because the PEDOT layer facilitated the electron transfer at the interface of electrode and electrolyte. (C) 2013 Elsevier B.V. All rights reserved.