Peng Ji, Xin Tan, Si-Min Chai, Xin-Cang Yu, Yi-Fan Peng, Bao-Lin Fu, Jian-Xiong Xu, Na Li, Jing Li
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Moreover, the strong hydrophobicity of PDMS shields the direct contact between the Zn anode and the aqueous electrolyte and further optimizes the reversible plating/stripping of Zn. The symmetrical cell assembled with PDMS@Zn anode displays a long lifespan of over 3000 h at 1 mA cm<sup>−2</sup> for 1 mAh cm<sup>−2</sup>. The PDMS@Zn||NH<sub>4</sub>V<sub>4</sub>O<sub>10</sub> full cell maintains the specific capacity of 284.8 mAh g<sup>−1</sup> after 1200 cycles at 1 A g<sup>−1</sup>. 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引用次数: 0
摘要
水锌离子电池(azib)因其低成本和环境可持续性而广泛应用于储能设备中。然而,锌枝晶的生长和副反应的发生仍然是azib实际应用的重要障碍。在这里,通过自发水解缩合反应,聚二甲基硅氧烷(PDMS)的疏水和锌相容的固体电解质界面层在Zn阳极表面原位接枝。PDMS的高粘弹性和化学形成的Si-O-Zn键共同保证了PDMS在Zn阳极上的适应性和稳定性。此外,PDMS的强疏水性屏蔽了锌阳极与水电解质的直接接触,进一步优化了锌的可逆镀/剥离。与PDMS@Zn阳极组装的对称电池在1ma cm - 2下为1mah cm - 2,寿命超过3000小时。PDMS@Zn||NH4V4O10全电池在1a g−1下循环1200次后保持284.8 mAh g−1的比容量。总的来说,我们的工作揭示了阳极界面介导下的Zn电沉积工艺,为设计稳定的Zn金属阳极提供了可持续性考虑,并为稳定Zn金属阳极提供了一种简单可行的途径,以实现无枝晶和长寿命。在原位化学接枝到Zn阳极上的疏水亲锌PDMS界面层,通过其粘弹性特性和Si-O-Zn键的形成,显著提高了界面稳定性,抑制了枝晶的生长,适应了循环过程中阳极体积的变化。PDMS层的疏水性和离子电导率进一步阻止了zn与电解质的直接接触,抑制了析氢,提高了Zn2+的扩散,从而增强了可逆性。
In situ engineering of a hydrophobic–zincophilic interface toward long-cycle stability of Zn metal anodes
Aqueous zinc-ion batteries (AZIBs) are widely used in energy storage devices due to their low cost and environmental sustainability. Nevertheless, the growth of Zn dendrites and the occurrence of side reactions remain significant barriers to the practical application of AZIBs. Here, a hydrophobic and zinc-compatible solid–electrolyte interface layer of poly(dimethylsiloxane) (PDMS) is in situ grafted on the Zn anode surface via spontaneous hydrolytic condensation reactions. The high viscoelasticity of PDMS and the chemically formed Si–O–Zn bonds synergistically ensure the adaptability and stability of PDMS on Zn anodes. Moreover, the strong hydrophobicity of PDMS shields the direct contact between the Zn anode and the aqueous electrolyte and further optimizes the reversible plating/stripping of Zn. The symmetrical cell assembled with PDMS@Zn anode displays a long lifespan of over 3000 h at 1 mA cm−2 for 1 mAh cm−2. The PDMS@Zn||NH4V4O10 full cell maintains the specific capacity of 284.8 mAh g−1 after 1200 cycles at 1 A g−1. Overall, our work sheds new light on the Zn electrodeposition process under the mediation of anode interface, offers sustainability considerations in designing stable Zn metal anodes, as well as provides a facile and viable path for stabilizing Zn anodes to achieve dendrite-free and long lifespan.
Graphical abstract
The hydrophobic and zincophilic PDMS interface layer, in situ chemical grafted onto the Zn anode, significantly enhances interfacial stability and suppresses dendrite growth through its viscoelastic properties and the formation of Si–O–Zn bonds, accommodating anode volume changes during cycling. The PDMS layer’s hydrophobicity and ionic conductivity further prevent direct Zn-electrolyte contact, inhibit hydrogen evolution, and improve Zn2+ diffusion, thereby enhancing reversibility.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.