Abstract
The reactivity of bromine with graphite and polyethylene was studied to clarify the deterioration mechanism of the carbon plastic (CP) electrode of the ZnBr 2 battery. At first, intercalation of bromine in highly oriented pyrolytic graphite (HOPG) was conducted in aqueous solution. Stages 2, 3, 4, and 5 bromine-graphite intercalation compounds (Br 2-GICs) were obtained in 19−3,2.9−0.8, 0.8−0.65, and 0.5 mol/1 Br 2 solutions, respectively, and analysed based on a linear diffusion theory. Apparent diffusion coefficients were found to be governed by the final stage structure. Bromine-GICs were electrochemically synthesised and decomposed in 3 mol/l ZnBr 2 solution. Bromine-GICs were ascertained to be generated and decomposed during charge/discharge cycles of the Zn-Br 2 battery. Repeated reaction of Br 2 with pyrolytic graphite (PG), polyethylene (PE), and CP led to C-Br bond formation, along with exfoliation and cracking on the surface. Consequently, this reaction must be the reason for the mechanical deterioration of the CP electrode in the Zn-Br 2 battery.
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