Long‐Life Sodium Metal Anodes Achieved by Cuprous Oxide–Modified Ni Foam Host,Energy Technology

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Long‐Life Sodium Metal Anodes Achieved by Cuprous Oxide–Modified Ni Foam Host
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-15 , DOI: 10.1002/ente.201901250
Jianchao Sun ₁ , Ming Zhang ₁ , Peng Ju ₂ , Yue Hu ₁ , Xiaoxia Chen ₁ , Wenrunze Wang ₁ , Chengcheng Chen _{3,

4}

Affiliation

Sodium metal is considered as a potential anode material for future energy‐storage systems. However, the practical application of Na is hindered by the infinite dimension change and dendrite growth during Na stripping/plating. Herein, a nanoflowered cuprous oxide–modified nickel foam (CNF) matrix is used as a stable host to guide Na nucleation behavior and suppress dendrite growth. Tailored CNF shows a 3D porous core–shell cylindrical structure with Cu₂O as the shell and special Ni as the core. The shell of CuO₂ can reduce the nucleation barrier of Na by reacting with sodium. The core of Ni provides a strong skeleton with high electrical conductivity, good mechanical ductility, and a rich porous structure. The unique matrix structure can direct the homogeneous nucleation of sodium metal and restrict its deposition within matrix pores, suppressing the volume expansion and dendrite growth of sodium metal. As a consequence, the Na/CNF anode exhibits an excellent stability over 1000 cycles with a capacity of 1 mAh cm⁻² at 1 mA cm⁻². Moreover, the full battery exhibits excellent performance over 300 cycles at a high rate (5 C). A new avenue is opened, herein, for practical applications of sodium metal anodes in rechargeable Na batteries.

中文翻译：

氧化亚铜改性的镍泡沫主体获得长寿命的钠金属阳极

金属钠被认为是未来储能系统的潜在阳极材料。但是，Na的实际应用受到Na剥离/镀覆过程中无限大的尺寸变化和枝晶生长的阻碍。在本文中，将纳米级氧化亚铜改性的镍泡沫（CNF）纳米花用作稳定的主体，以引导Na成核行为并抑制枝晶生长。量身定制的CNF显示了一种3D多孔核-壳圆柱形结构，其中以Cu ₂ O为壳，特殊的Ni为核。CuO ₂的壳可以通过与钠反应降低Na的成核屏障。Ni的核提供了坚固的骨架，具有高的导电性，良好的机械延展性和丰富的多孔结构。独特的基质结构可以指导钠金属的均匀成核并限制其在基质孔中的沉积，从而抑制钠金属的体积膨胀和枝晶生长。其结果是，所述的Na / CNF阳极表现出超过1000个循环的稳定性优异，其容量为1毫安厘米^-2在1mA厘米^-2。此外，完整的电池在高速率（5 C）下经过300次循环后表现出出色的性能。这里开辟了一条新途径，用于可充电Na电池中钠金属阳极的实际应用。

更新日期：2020-01-15

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