Inhibition of Vanadium Cathodes Dissolution in Aqueous Zn-ion Batteries.
Inhibition of Vanadium Cathodes Dissolution in Aqueous Zn-ion Batteries.
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DOI：
10.1002/adma.202310645
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发表时间：
2024-01
影响因子：
29.4
通讯作者：
Yuhang Dai;Chengyi Zhang;Jianwei Li;Xuan Gao;Ping Hu;Chumei Ye;Hongzhen He;Jiexin Zhu
中科院分区：
文献类型：
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作者：
Yuhang Dai;Chengyi Zhang;Jianwei Li;Xuan Gao;Ping Hu;Chumei Ye;Hongzhen He;Jiexin Zhu
水性锌离子电池（azib）的普及程度迅速上升，这一点从过去5年发表的3万多篇文章的广泛研究中可以看出。先前对azib的研究显示了在高电流密度下令人印象深刻的长周期稳定性，实现了数千或数万次循环。然而，由于阴极溶解加剧，azib在低电流密度（<1C）下的实际稳定性仅限于50-100次循环。这种真正的限制对它们从实验室到工业的过渡构成了相当大的挑战。在本研究中，利用密度泛函理论（DFT）计算，描述了一种人工界面相，它既能实现疏水性，又能限制溶解的钒阳离子向外渗透，从而改变反应平衡，并根据勒夏特列原理抑制钒的溶解。该方法产生了迄今为止最好的循环稳定性之一，在200 mA g - 1 （0.47C）下超过200次循环（≈720 h）后没有明显的容量衰减。这些发现代表了水电池超稳定阴极设计的重大进展，并加速了水锌离子电池的工业化。
Aqueous zinc‐ion batteries (AZIBs) have experienced a rapid surge in popularity, as evident from the extensive research with over 30 000 articles published in the past 5 years. Previous studies on AZIBs have showcased impressive long‐cycle stability at high current densities, achieving thousands or tens of thousands of cycles. However, the practical stability of AZIBs at low current densities (<1C) is restricted to merely 50–100 cycles due to intensified cathode dissolution. This genuine limitation poses a considerable challenge to their transition from the laboratory to the industry. In this study, leveraging density functional theory (DFT) calculations, an artificial interphase that achieves both hydrophobicity and restriction of the outward penetration of dissolved vanadium cations, thereby shifting the reaction equilibrium and suppressing the vanadium dissolution following Le Chatelier's principle, is described. The approach has resulted in one of the best cycling stabilities to date, with no noticeable capacity fading after more than 200 cycles (≈720 h) at 200 mA g−1 (0.47C). These findings represent a significant advance in the design of ultrastable cathodes for aqueous batteries and accelerate the industrialization of aqueous zinc‐ion batteries.