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Jianping Chen¹, Yayun Shi², Songhe Zheng¹

¹School of Materials Science and Engineering, Tongji University, Shanghai, 201804, P. R. China.

Angewandte Chemie (International ed. in English)

|April 22, 2024

概括

研究人员为水性离子电池 (ZIB) 开发了一种新策略,以防止阳极上的演化反应 (HER). 这种方法使用MXene上的自组装单层 (SAM) 来阻止质子运输,提高电池的稳定性和性能.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

水性离子电池 (ZIB) 是下一代能源存储的前景.
然而,ZIB面临诸如演化反应 (HER) 和阳极的副作用等挑战.
通过键网络进行的介面质子传输至关重要,但与 HER 相比,研究不足.

研究的目的:

为水性ZIBs开发一种无HER的阳极策略.
为了研究介面键网络在HER中的作用.
为了提高ZIB的自行车稳定性和性能.

主要方法:

通过在Ti3C2Tx基板上固定离子液态来构建一个自组装单层 (SAM).
采用分子动力学模拟来分析水分子协调界面和键网络.
使用现场表征来监测气体演变和电极稳定性.
制造的对称电池和硬币/钱包充满电池用于性能测试.

主要成果:

设计的SAM显著降低了界面水密度,并打破了键网络连接.
质子运输被有效地阻止,抑制了HER.
从Zn@SAM-MXene阳极检测到可以忽略的H2气体.
对称的细胞实现了长周期寿命 (3000小时在1 mA cm-2).
在大面积囊细胞中,全细胞表现出高容量保留 (>1000个循环后94%) 和稳定的性能.

结论:

通过控制界面水,SAM策略有效地抑制水性ZIB中的HER.
这种方法可以显著提高骑自行车的稳定性和性能.
开发的Zn@SAM-MXene阳极显示了实际储能应用的巨大潜力.

关键词:

水性Zn离子电池的使用情况的进化是因为的进化.介面质子运输的介面.自组装的单层单层.Zn金属阳极是一种金属阳极.

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