Jin Shirui, Duan Fengxue, Wu Xiaoyu, Li Junpeng, Dan Xinxing, Yin Xiuxiu, Zhao Kangning, Wei Yingjin, Sui Yongming, Du Fei, Wang Yizhan
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, 130012, Changchun, China.
School of Materials Science and Engineering, Beihua University, 132013, Jilin, China.
Small. 2022 Dec;18(51):e2205462. doi: 10.1002/smll.202205462. Epub 2022 Nov 4.
Aqueous zinc metal batteries with mild acidic electrolytes are considered promising candidates for large-scale energy storage. However, the Zn anode suffers from severe Zn dendrite growth and side reactions due to the unstable interfacial pH and the absence of a solid electrolyte interphase (SEI) protective layer. Herein, a novel and simple mixed electrolyte strategy is proposed to address these problems. The mixed electrolytes of 2 M ZnSO and 2 M Zn (CF SO ) can efficiently buffer the interfacial pH and induce the in situ formation of the organic-inorganic SEI layer, which eliminates dendrite growth and prevents side reactions. As a result, Zn anodes in mixed electrolyte exhibit a lifespan enhancement over 400 times, endure stable cycling over 270 h at a high DOD of 62% and achieve high Zn plating/stripping reversibility with an average CE of 99.5% for 1000 cycles at 1 mA cm . The findings pave the way for developing practical electrolyte systems for Zn batteries.
具有温和酸性电解质的水系锌金属电池被认为是大规模储能的有前途的候选者。然而，由于界面pH不稳定以及缺乏固体电解质界面（SEI）保护层，锌负极会出现严重的锌枝晶生长和副反应。在此，提出了一种新颖且简单的混合电解质策略来解决这些问题。2 M ZnSO₄和2 M Zn（CF₃SO₃）₂的混合电解质可以有效地缓冲界面pH，并诱导有机-无机SEI层的原位形成，这消除了枝晶生长并防止了副反应。结果，混合电解质中的锌负极的寿命提高了400倍以上，在62%的高深度放电（DOD）下稳定循环超过270小时，并在1 mA cm⁻²下1000次循环中实现了高的锌电镀/剥离可逆性，平均库仑效率（CE）为99.5%。这些发现为开发实用的锌电池电解质系统铺平了道路。
