用于抑制枝晶生长的锂金属阳极的电化学脱合金 3D 分层多孔铜集流体,ACS Applied Energy Materials

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用于抑制枝晶生长的锂金属阳极的电化学脱合金 3D 分层多孔铜集流体
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-11-14 , DOI: 10.1021/acsaem.1c02696
Chen Luan ₁ , Lu Chen ₁ , Bin Li ₁ , Lin Zhu ₂ , Wenzhen Li _{1,

2,

3}

Affiliation

锂金属负极对高能量密度电池最具吸引力，因为其理论容量高达 3860 mA hg ^–1. 然而，它们的实际应用受到锂枝晶生长、负极体积变化、负极/电解质界面不稳定等诸多挑战的阻碍。在这里，我们展示了一种使用高效电化学脱合金方法衍生的三维分级多孔铜 (3DHP Cu) 集电器，该方法可以抑制循环过程中锂枝晶的生长。多孔铜表面的微孔有利于锂离子的嵌入/脱嵌，从而加速快速电化学反应动力学，多孔铜内相互连接的铜网络在镀锂/脱锂过程中保持体积变化。此外，表面的纳米孔进一步实现了高表面积和均匀的电流分布。^–2具有 33 mV 的低电压滞后。此外，与使用平面铜箔的全电池相比，Li@3DHP Cu||LiFePO ₄全电池表现出更好的循环稳定性，在 1C 下循环 150 次后可产生 110.2 mA hg ^–1。我们的工作为开发安全且使用寿命长的锂金属负极铺平了道路，该负极具有使用高效电化学脱合金策略衍生的多孔 Cu 集流体。

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Electrochemical Dealloying-Enabled 3D Hierarchical Porous Cu Current Collector of Lithium Metal Anodes for Dendrite Growth Inhibition

Lithium metal anodes are the most attractive for high-energy-density batteries because of their high theoretical capacity of 3860 mA h g^–1. However, their practical application is hindered by many challenges such as lithium dendrite growth, volume change of anodes, unstable anode/electrolyte interphase, and so on. Here, we demonstrate a three-dimensional hierarchical porous copper (3DHP Cu) current collector derived using a highly efficient electrochemical dealloying method that can suppress lithium dendrite growth during cycling. The micropores on the surface of the porous copper facilitate the insertion/extraction of lithium ions, which accelerates fast electrochemical reaction kinetics, and the interconnected copper network within the porous copper holds the volume change during lithium plating/stripping. Moreover, the nanopores on the surface further enable a high surface area and even current distribution. Symmetric cells assembled with the 3DHP Cu exhibit stable cycling over 850 h at 1 mA cm^–2 with a low voltage hysteresis of 33 mV. In addition, compared with a full cell using a planar Cu foil, a Li@3DHP Cu||LiFePO₄ full cell exhibits better cycle stability that results in 110.2 mA h g^–1 at 1C after 150 cycles. Our work paves the way for developing safe and longevous lithium metal anodes with a porous Cu current collector derived using a highly efficient electrochemical dealloying strategy.

更新日期：2021-12-27

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