Zinc is recently gaining interest in the battery community as potential alternative anode material, because of its large natural abundance and potentially larger volumetric density than graphite. Nevertheless, pure Zn anodes have shown so far very poor cycling performance. Here, the electrochemical performance of Zn‐rich porous Cu–Zn alloys electrodeposited by an environmentally friendly (aqueous) dynamic hydrogen bubble template method is reported. The lithiation/delithiation mechanism is studied in detail by both in situ and ex situ X‐ray diffraction, indicating the reversible displacement of Zn from the Cu–Zn alloy upon reaction with Li. The influence of the alloy composition on the performance of carbon‐ and binder‐free electrodes is also investigated. The optimal Cu:Zn atomic ratio is found to be 18:82, which provides impressive rate capability up to 10 A g⁻¹ (≈30C), and promising capacity retention upon more than 500 cycles. The high electronic conductivity provided by Cu, and the porous electrode morphology also enable superior lithium storage capability at low temperature. Cu₁₈Zn₈₂ can indeed steadily deliver ≈200 mAh g⁻¹ at −20 °C, whereas an analogous commercial graphite electrode rapidly fades to only 12 mAh g⁻¹.

中文翻译：

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3D多孔铜锌合金可替代锂离子电池，具有出色的低T性能，可替代阳极材料

锌由于其丰富的自然丰度和比石墨更大的体积密度，最近作为潜在的替代阳极材料而引起了电池界的关注。然而，到目前为止，纯锌阳极已显示出非常差的循环性能。在此，报道了通过环境友好（水）动态氢气泡模板法电沉积的富锌多孔Cu-Zn合金的电化学性能。通过原位和异位X射线衍射对锂化/脱锂机理进行了详细研究，表明与Li反应后，Zn从Cu-Zn合金中可逆地置换。还研究了合金成分对无碳无粘结剂电极性能的影响。发现最佳的Cu：Zn原子比为18:82，^-1（≈30 Ç），并且在超过500个循环有前途的容量保持率。铜提供的高电子电导率以及多孔电极的形态也使低温下的锂储能能力更强。实际上，Cu ₁₈ Zn ₈₂在-20°C时可以稳定地提供≈200mAh g ^-1的能量，而类似的商用石墨电极则迅速衰减至仅12 mAh g ^-1。