Uniform Zinc Deposition Regulated by a Nitrogen-Doped MXene Artificial Solid Electrolyte Interlayer,Small

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Uniform Zinc Deposition Regulated by a Nitrogen-Doped MXene Artificial Solid Electrolyte Interlayer
Small ( IF 13.0 ) Pub Date : 2023-04-10 , DOI: 10.1002/smll.202300633
Jingwan Gao ₁ , Xiaoya Zhang ₁ , Meiling Wang ₁ , Jingyi Qiu ₂ , Hao Zhang ₂ , Xibang Chen ₂ , Yizhan Wang _{1,

3} , Yingjin Wei _{1,

3}

Affiliation

The dendrite growth and side reactions of zinc metal anode in mildly acidic electrolytes seriously hinder the practical application of aqueous zinc–ion battery. To address these issues, an artificial protective layer of nitrogen-doped MXene (NMX) is used to protect the zinc anode. The NMX protective layer has high conductivity and uniformly distributed zincophilic sites, which can not only homogenize the local electric field on the electrode interface but also accelerate the kinetics for Zn deposition. As a result, the NMX protective layer induces uniform zinc deposition and reduces the overpotential of the electrode. Encouragingly, this NMX-protected Zn anode can cycle stably for 1900 h at 1 mA cm⁻² and 1 mAh cm⁻². In asymmetric cells, it achieves high cycle reversibility with an average Coulomb efficiency of 99.79% for 4800 cycles at 5 mA cm⁻².

中文翻译：

由氮掺杂 MXene 人造固体电解质中间层调节的均匀锌沉积

锌金属负极在弱酸性电解液中的枝晶生长和副反应严重阻碍了水系锌离子电池的实际应用。为了解决这些问题，使用氮掺杂 MXene (NMX) 的人工保护层来保护锌阳极。NMX保护层具有高电导率和均匀分布的亲锌位点，不仅可以均匀化电极界面上的局部电场，还可以加速锌沉积的动力学。因此，NMX 保护层诱导均匀的锌沉积并降低电极的过电势。令人鼓舞的是，这种NMX保护的Zn负极可以在1 mA cm ^-2和1 mAh cm ^-2下稳定循环1900小时。^{在不对称电池中，它实现了高循环可逆性，在5 mA cm -2}下4800次循环的平均库仑效率为99.79% 。

更新日期：2023-04-10

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