Interface regulation of the Zn anode by using a low concentration electrolyte additive for aqueous Zn batteries,Chemical Science

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Interface regulation of the Zn anode by using a low concentration electrolyte additive for aqueous Zn batteries
Chemical Science ( IF 7.6 ) Pub Date : 2023-12-06 , DOI: 10.1039/d3sc05098j
Kuo Wang ₁ , Qianrui Li ₁ , Guoli Zhang ₁ , Shuo Li ₁ , Tong Qiu ₁ , Xiao-Xia Liu _{1,

2,

3} , Xiaoqi Sun _{1,

2}

Affiliation

The Zn metal anode in aqueous Zn batteries faces a number of challenges including instable deposition and corrosion issues. Here, we present an interface environment regulation for a Zn electrode with a low concentration electrolyte additive of 0.1 m 3-aminobenzenesulfonic acid (ASA). ASA prefers to adsorb on the Zn surface over water and creates an ASA-rich interface. It further enters the Zn²⁺ solvation sheath locally, which shifts the lowest unoccupied molecular orbital from solvated water to ASA. The hydrogen evolution reaction from solvated water reduction is inhibited, and the reduction of solvated ASA generates a stable solid-electrolyte interphase composed of the ion conductor ZnS covered by organic–inorganic mixed components. With the resulting homogenized Zn deposition, continuous Zn stripping in symmetric cells reaches 99.7% depth of discharge (DOD) at a current density of 2 mA cm⁻², whereas cell short-circuit takes place at 11.4% DOD in the ASA free ZnSO₄ electrolyte. The repeated stripping/plating also realizes 1100 h cycle life at 2 mA cm⁻², and a 99.54% stabilized coulombic efficiency is obtained for 500 cycles at 10 mA cm⁻².

中文翻译：

使用低浓度电解质添加剂对水系锌电池锌阳极的界面调节

水性锌电池中的锌金属阳极面临着许多挑战，包括不稳定的沉积和腐蚀问题。在这里，我们提出了使用 0.1 m 3-氨基苯磺酸 (ASA) 低浓度电解液添加剂对 Zn 电极进行界面环境调节。 ASA 比水更容易吸附在 Zn 表面，并形成富含 ASA 的界面。它进一步局部进入Zn ²⁺溶剂化鞘，将最低的未占据分子轨道从溶剂化水转移到ASA。溶剂化水还原产生的析氢反应受到抑制，溶剂化 ASA 的还原生成了由有机-无机混合组分覆盖的离子导体 ZnS 组成的稳定的固体电解质界面。随着均匀的锌沉积，对称电池中的连续锌剥离在电流密度为2 mA cm ^-2时达到99.7%放电深度(DOD)，而在不含ASA的ZnSO ₄中，电池短路发生在11.4% DOD电解质。重复剥离/电镀还实现了2 mA cm ^-2下1100小时的循环寿命，并且在10 mA cm ^-2下500次循环获得了99.54%的稳定库仑效率。

更新日期：2023-12-10

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