A diluent protective organic additive electrolyte of hydrophilic hyperbranched polyester for long-life reversible aqueous zinc manganese oxide batteries
Hengxin Xu , Song Yang , Yufeng Chen , Junle Xiong , Shengtao Zhang , Fang Gao , Zhengyong Huang , Hongru Li
Front. Mater. Sci. ›› 2023, Vol. 17 ›› Issue (2) : 230639
A diluent protective organic additive electrolyte of hydrophilic hyperbranched polyester for long-life reversible aqueous zinc manganese oxide batteries
A hydrophilic hyperbranched polyester (poly (tetramethylol acetylenediurea (TA)-CO-succinyl chloride) (PTS)) was proposed to be used as an organic additive in aqueous ZnSO4 electrolyte to achieve a highly reversible zinc/manganese oxide battery. It is found that the zinc symmetric battery based on the 2.0 wt.% PTS/ZnSO4 electrolyte showed a long cycle stability of more than 2400 h at 1.0 mA·cm−2, which is much longer than that including the blank ZnSO4 electrolyte (140 h). Furthermore, the capacity retention of the Zn||MnO2 full cells employing the 2.0 wt.% PTS/ZnSO4 electrolyte remained 85% after 100 cycles at 0.2 A·g−1, which is much higher than 20% capacity retention of the cell containing the blank ZnSO4 electrolyte, and also greater than 59.6% capacity retention of the cell including the 10.0 wt.% TA/ZnSO4 electrolyte. By using 2.0 wt.% PTS/ZnSO4 electrolytes, the capacity retention of the Zn||MnO2 full cells even reached 65% after 2000 cycles at a higher current density of 1.0 A·g−1. It is further demonstrated that the PTS was firmly adsorbed on the zinc anode surface to form a protective layer.
aqueous zinc-ion battery / hydrophilic branched polyester / Zn anode protection / Zn dendrite / adsorption
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Higher Education Press
Supplementary files
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