Novel in situ SEI fabrication on Zn anodes for ultra-high current density tolerance enabled by electrical excitation–conjugation of iminoacetonitriles†
Ruqian Zhang, Tao Shui, An Li, Huan Xia, Gang Xu, Lingfeng Ji, Chengjie Lu, Wei Zhang and ZhengMing Sun
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引用次数: 0
Abstract
Aqueous zinc-ion batteries (AZIBs) offer significant advantages, including low cost, inherent safety, and high theoretical capacity. However, they are prone to surface corrosion and uncontrolled dendrite growth on zinc anodes, particularly under high current densities. Herein, we propose an artificial solid electrolyte interphase (SEI) composed of complex Zn2+ salts to alter the de-solvation process and homogenize the electric field, thereby enabling stable circulation of AZIBs. This SEI is formed through the excitation of iminodiacetonitrile (IDAN) into iminodiacetic acid (IDA) on the surface of the zinc anode during electroplating. Simultaneously, the generated IDAs conjugate with flowing zinc ions thus creating a dense protective layer embedded into the anode surface. The obtained SEI exhibits superior Zn2+ conductivity, super-hydrophilic properties, electrical insulation and negligible interfacial resistance, imparting outstanding durability to the zinc anode even at an ultra-high current density (100 mA cm−2, over 630 h) without dendrite growth, giving a cumulative plating capacity exceeding 31.5 A h cm−2. Moreover, the favorable zinc plating/stripping behavior facilitated by the SEI enables stable operation under harsh conditions (90% depth of discharge, 440 h of Zn||Zn and 20 A g−1, 2000 cycles of Zn||NH4V4O10). The current density tolerance provided by the complex SEI, achieved through a novel in situ excitation/conjugation fabrication process, promises to enrich SEI strategies and expand the application of AZIBs, particularly in fast-charging/discharging battery systems.
水性锌离子电池(azib)具有成本低、固有安全性高、理论容量高等显著优势。但在高电流密度下,锌阳极容易发生表面腐蚀和枝晶生长失控。本文提出了一种由配合Zn2+盐组成的人工固体电解质界面(SEI)来改变脱溶剂过程并均匀化电场,从而实现azib的稳定循环。这种SEI是在电镀过程中在锌阳极表面由亚氨基二乙腈(IDAN)激发成亚氨基二乙酸(IDA)而形成的。同时,生成的IDAs与流动的锌离子结合,从而在阳极表面形成致密的保护层。获得的SEI具有优异的Zn2+导电性、超亲水性、电绝缘性和可忽略的界面电阻,即使在超高电流密度(100 mA·cm-2,超过630 h)下也能使锌阳极具有出色的耐久性,而不会产生枝晶,累计镀容量超过31.5 Ah·cm -2。此外,SEI促进了良好的镀锌/剥离行为,使其在恶劣条件下(90%放电深度,440 h Zn||Zn和20 A g-1, 2000次循环Zn||NH4V4O10)稳定运行。通过一种新颖的原位激发/共轭制造工艺,复合SEI提供的电流密度容限有望丰富SEI策略并扩大azib的应用,特别是在快速充放电电池系统中。
期刊介绍:
Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences."
Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).