Zhifei Li, Zelang Jian, Xingfeng Wang, Ismael A. Rodríguez-Pérez, Clement Bommier and Xiulei Ji
Chem. Commun., 2017,53, 2610-2613
DOI:
10.1039/C7CC00301C,
Communication
The rate capability of hard carbon has long been underestimated in prior studies that used carbon/Na two-electrode half-cells. Through a three-electrode cell setup, we discover that it is the overpotential of the sodium counter electrode that drives the half-cells to the lower cutoff potential prematurely during hard carbon sodiation, particularly at high current rates, which prevents the hard carbon anode from being fully sodiated.
