Zinc metal is widely used as an anode in various aqueous systems. However, zinc anode suffers from the dendrite formation on the surface upon cycling leading to a poor cyclability of a cell and its termination due to short circuit. In this work, the effect of tetrapropylammonium hydroxide (TPAH) was studied as an electrolyte additive for aqueous Zn//ZnCl₂ + LiCl//LiFePO₄ battery. TPAH additive prolongs the battery cycle life depending on its concentration (0.01–0.1 M). The better capacity retention over 350 cycles was observed for a symmetrical Zn//ZnCl₂ + LiCl//Zn cell with 0.05 M TPAH whereas without additives the cell worked for only 110 cycles. The mechanism of TPAH influence on capacity retention is proposed based on the results of SEM and XRD analysis of the Zn anode and FTIR and NMR studies of the electrolyte. The XRD patterns of the negative electrode of the cell with TPAH indicates that zinc was preferentially deposited in a highly oriented (002) direction, which is more resistant against dendrite formation. These differences in deposited structure of Zn dendrites were confirmed by SEM images as well. FTIR and NMR spectra showed that TPAH decomposes to propylamine (R_nN⁺H) and propene during cycling. TPAH also has an effect on the size and uniform distribution of Zn growth sides.

锌金属在各种水性体系中被广泛用作阳极。然而，锌阳极在循环时在表面上形成树枝状晶体，导致电池的循环性差并且由于短路而终止。在这项工作中，研究了氢氧化四丙基铵（TPAH）作为水性Zn // ZnCl ₂ + LiCl // LiFePO ₄电池电解质添加剂的作用。TPAH添加剂根据其浓度（0.01–0.1 M）延长电池循环寿命。对于对称的Zn // ZnCl _2，在350个循环中观察到了更好的容量保持率+具有0.05 M TPAH的LiCl // Zn电池，而没有添加添加剂的电池只能工作110个循环。根据对锌阳极的SEM和XRD分析结果以及电解液的FTIR和NMR研究结果，提出了TPAH影响容量保持率的机理。带有TPAH的电池负极的XRD图谱表明，锌优先沿高度取向（002）的方向沉积，从而更能抵抗枝晶的形成。Zn树突的沉积结构的这些差异也由SEM图像证实。FTIR和NMR谱表明，TPAH在循环过程中分解为丙胺（R _n N ⁺ H）和丙烯。TPAH也影响锌生长面的大小和均匀分布。