Figure 23.

(a) First discharge–charge curve of a Na/S₈ battery with liquid electrolyte at room temperature and analysis points of sulfur electrode such as (a) pristine, (b) discharged to 50 mAh/g sulfur in sloping region, (c) discharged to 200 mAh/g sulfur in plateau region, (d) fully discharged to 1.2 V and (e) fully charged to 2.3 V. (b) DSC curves of the sulfur electrode with various cut-off voltage conditions as shown in (a). Figure adapted with permission from [257], copyright 2011 Elsevier.