The efficiency of zinc electrodeposition is of fundamental importance for improving long-term performance of aqueous zinc-ion batteries. In order to improve the efficiency of electrodeposition, as well as morphology and reactivity of the zinc deposit, it is possible to use organic additives in the electrolyte. Here, the effect of branched polyethyleneimine (BPEI) as an electrolyte's additive on morphology and kinetics of zinc electrodeposition in 0.5 M of ZnSO₄ solution is investigated. The presence of BPEI changes the morphology of the electrodeposited layer from laminated hexagonal large crystals to compact layer without preferential growth morphology. Moreover, we observe that BPEI adsorption on the surface of the substrate suppresses the kinetics of zinc electrodeposition and decreases the grain growth rate, thus favoring the nucleation over the growth. As a result, BPEI ensures a homogeneous distribution of the current densities and can guarantee uniformity of the deposited layer.

锌电沉积的效率对于改善水性锌离子电池的长期性能至关重要。为了提高电沉积的效率以及锌沉积物的形态和反应性，可以在电解质中使用有机添加剂。在此，支化聚乙烯亚胺（BPEI）作为电解质的添加剂对0.5 M ZnSO ₄中锌电沉积的形貌和动力学的影响解决方案进行了调查。BPEI的存在将电沉积层的形态从层压的六角形大晶体变为致密层，而没有优先的生长形态。此外，我们观察到在基材表面上的BPEI吸附抑制了锌电沉积的动力学并降低了晶粒的生长速率，因此有利于成核而不是生长。结果，BPEI确保电流密度的均匀分布并且可以保证沉积层的均匀性。