Toward a Practical Zn Powder Anode: Ti3C2Tx MXene as a Lattice-Match Electrons/Ions Redistributor,ACS Nano

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Toward a Practical Zn Powder Anode: Ti3C2Tx MXene as a Lattice-Match Electrons/Ions Redistributor
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-03 , DOI: 10.1021/acsnano.1c04354
Xinliang Li ₁ , Qing Li ₁ , Yue Hou ₁ , Qi Yang ₁ , Ze Chen ₁ , Zhaodong Huang ₁ , Guojin Liang ₁ , Yuwei Zhao ₁ , Longtao Ma ₁ , Mian Li ₂ , Qing Huang ₂ , Chunyi Zhi _{1,

3,

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Affiliation

The renaissance of aqueous Zn ion batteries has drawn intense attention to Zn metal anode issues, including dendrites growth, dead Zn, low efficiency, and other parasitic reactions. However, against the widely used 2D Zn foil, in fact, the Zn powder anode is a more practical choice for Zn-based batteries in industrial applications, but the related solutions are rarely investigated. Herein, we focus on the Zn powder anode and disclose its unknown failure mechanism different from Zn foils. By utilization of 2D flexible conductive Ti₃C₂Tx MXene flakes with hexagonal close-packed lattice as electrons and ions redistributor, a stable and highly reversible Zn powder anode without dendrite growth and low polarization is constructed. Low lattice mismatch (∼10%) enables a coherent heterogeneous interface between the (0002) plane of deposited Zn and (0002) plane of the Ti₃C₂Tx MXene. Thus, the Zn²⁺ ions are induced to undergo rapid uniform nucleation and sustained reversible stripping/plating with low energy barriers via the internally bridged shuttle channels. Paired with cyano group iron hexacyanoferrate (FeHCF) cathode, the FeHCF//MXene@Zn full battery delivers superior cycle durability and rate capability, whose service life with a CE of near 100% touches 850% of bare Zn powder counterparts. The proposed Ti₃C₂Tx MXene redistributor strategy concerning high-speed electrons/ions channel, low-barrier heterogeneous interface, is expected to be widely applied to other alkali metal anodes.

中文翻译：

走向实用的锌粉阳极：Ti3C2Tx MXene 作为晶格匹配电子/离子再分配器

水系锌离子电池的复兴引起了人们对锌金属负极问题的强烈关注，包括枝晶生长、死锌、低效率和其他寄生反应。然而，相对于广泛使用的二维锌箔，实际上锌粉负极在工业应用中是锌基电池更实用的选择，但相关的解决方案却鲜有研究。在此，我们专注于锌粉阳极并揭示其与锌箔不同的未知失效机制。利用二维柔性导电 Ti ₃ C ₂ T xMXene 薄片具有六方密排晶格作为电子和离子的再分配器，构建了稳定且高度可逆的锌粉阳极，没有枝晶生长和低极化。低晶格失配 (~10%) 使沉积的 Zn 的 (0002) 面和 Ti ₃ C ₂ T x MXene的 (0002) 面之间形成相干的异质界面。因此，Zn ²⁺离子通过内部桥接的穿梭通道被诱导进行快速均匀的成核和持续的可逆剥离/镀覆，具有低能垒。FeHCF//MXene@Zn 全电池与氰基六氰基铁酸铁 (FeHCF) 阴极搭配使用，可提供卓越的循环耐久性和倍率性能，其使用寿命接近 100% 的 CE 达到 850% 的裸锌粉末对应物。所提出的涉及高速电子/离子通道、低势垒异质界面的Ti ₃ C ₂ T x MXene 再分配器策略有望广泛应用于其他碱金属阳极。

更新日期：2021-09-28

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