Allen Lauren N, Wang Ziqing, Shan Lutong, Tang Boya, Mullins C Buddie
Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.
Department of Chemistry, University of Manchester, Manchester M 138PL, United Kingdom.
ACS Appl Mater Interfaces. 2024 Sep 11;16(36):47599-47609. doi: 10.1021/acsami.4c09325. Epub 2024 Aug 29.
Aqueous zinc-ion batteries have promising potential as energy storage devices due to their low cost and environmental friendliness. However, their development has been hindered by zinc dendrite formation and parasitic side reactions. Herein, we introduce a low-concentration sodium benzoate (NaBZ) electrolyte additive to stabilize the electrode-electrolyte interface and promote deposition on the Zn (002) crystal plane. From experimental characterization and computational analyses, NaBZ was found to adsorb on the Zn surface and inhibit side reactions while guiding homogeneous Zn deposition on the (002) plane. Consequently, Zn|Zn symmetric cells with the NaBZ additive cycled stably for over 1000 h at a current density of 0.5 mA cm and an areal capacity of 0.5 mAh cm, while Zn|Cu cells showed excellent reversibility with a Coulombic efficiency of 99.05%. Moreover, Zn|NaVO full cells achieve a high specific capacity of 124 mAh g while cycling for 600 h at 2 A g. These findings present a low-cost electrolyte modification strategy for reversible zinc-ion batteries.
水系锌离子电池因其低成本和环境友好性而具有作为储能装置的广阔潜力。然而，锌枝晶的形成和寄生副反应阻碍了它们的发展。在此，我们引入一种低浓度苯甲酸钠（NaBZ）电解质添加剂，以稳定电极-电解质界面并促进在Zn(002)晶面上的沉积。通过实验表征和计算分析发现，NaBZ吸附在Zn表面，抑制副反应，同时引导Zn在(002)面上均匀沉积。因此，添加NaBZ的Zn|Zn对称电池在电流密度为0.5 mA cm²和面积容量为0.5 mAh cm²的条件下稳定循环超过1000小时，而Zn|Cu电池表现出优异的可逆性，库仑效率为99.05%。此外，Zn|NaVO全电池在2 A g的电流密度下循环600小时时实现了124 mAh g的高比容量。这些发现为可逆锌离子电池提出了一种低成本的电解质改性策略。
