Application of BIS-TRIS

Details:

BIS-TRIS  is rich in hydroxyl functional groups, which are expected to interact with Zn2+ to change its solvation structure and realize a highly reversible zinc anode. A large number of bubbles appeared on the surface of the Zn foil during cycling, which indicated that during the zinc deposition process accompanied by Violent hydrogen evolution side reaction. The occurrence of hydrogen evolution reaction not only reduces the Coulombic efficiency of the zinc deposition/stripping process, but also increases the internal pressure of the battery and accelerates the damage of the battery, which greatly affects the service life of the battery. In contrast, no obvious bubble generation was observed after the zinc foil was cycled in the solution containing BIS-TRIS. .
The role of BIS-TRIS complexing agents in realizing dendrite-free, long-life zinc metal anodes. BIS-TRIS is rich in hydroxyl functional groups. When zinc ions in solution coordinate with hydroxyl groups, the larger steric hindrance of the zinc-complex can increase its nucleation barrier, reduce the kinetics of zinc ion deposition and effectively slow down the deposition process. concentration polarization. At the same time, the BIS-TRIS additive partially replaces the water in the solvated structure, so that the water content on the surface of the metal anode can be effectively regulated, which plays an important role in enhancing the electrochemical/chemical stability of Zn metal.
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