화학공학소재연구정보센터
Journal of Power Sources, Vol.340, 14-21, 2017
The mechanism of the sodiation and desodiation in Super P carbon electrode for sodium-ion battery
The sodiation and desodiation of sodium (Na) into the Super-P carbon anode material were investigated using electrochemical analyses, high-resolution transmission electron microscopy (HRTEM), and neutron powder diffraction (NPD). In the sodiated Super-P carbon, sodium is stored both in the graphite interlayer space of carbon nano-particles and pores between the particles. Sodium metal clusters found in micro-pores between the carbon particles are responsible for the large irreversible capacity of the Super-P electrode. The graphite interlayer distance increases on sodiation from 3.57 A to two distinct values of similar to 3.84 and 4.41 angstrom. The mechanism of the process is discussed. (C) 2016 Elsevier B.V. All rights reserved.