利用聚乙二醇和纳米二氧化硅复合水凝胶提高柔性锌-空气电池性能的研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-16 DOI:10.1016/j.jelechem.2024.118721

Xinru Qu , Gaoyuan Liu , Na Xu , Lina Zhao , Zhanlin Xu

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引用次数: 0

摘要

柔性锌空气电池因其能量密度高、成本低和环保而备受关注。然而，循环寿命短和阳极枝晶生长等问题严重阻碍了其实际应用。本研究引入聚乙二醇（PEG）作为成孔剂，并将纳米二氧化硅加入聚丙烯酰胺/羧甲基纤维素（PAM/CMC）复合水凝胶中，从而得到 PAM/CMC/PEG/SiO2 (PCPS) 复合水凝胶。对 PCPS 进行了相分析和电化学表征。在碱性 KI 环境中形成的水凝胶电解质组装成电池后，容量达到 494.6 mAh/g，并在 0.36 V 的低电位范围内维持了 40 多小时，前 60 个循环的能量效率为 86.3%。为了解决树枝状突起在碱性环境中生长的问题，本研究还探讨了 PCPS 复合水凝胶在近中性环境中的性能。

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Study on the enhancement of flexible zinc-air battery performance with polyethylene glycol and nano SiO2 composite hydrogel

Flexible zinc-air batteries have garnered significant attention due to their high energy density, low cost, and environmental friendliness. However, issues such as poor cycle life and anode dendrite growth severely hinder their practical application. This study introduces polyethylene glycol (PEG) as a pore-forming agent and incorporates nano SiO₂ into a polyacrylamide/carboxymethyl cellulose (PAM/CMC) composite hydrogel, resulting in a PAM/CMC/PEG/SiO₂ (PCPS) composite hydrogel. Phase analysis and electrochemical characterization of PCPS were conducted. The hydrogel electrolyte formed in an alkaline KI environment, when assembled into a battery, achieved a capacity of 494.6 mAh/g and maintained a low potential range of 0.36 V for over 40 h, with an energy efficiency of 86.3 % for the first 60 cycles. To address the issue of dendrite growth in alkaline environments, this study also explores the performance of PCPS composite hydrogel in near-neutral environments.

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.