One-Dimensional Porous Li-Confinable Hosts for High-Rate and Stable Li-Metal Batteries,ACS Nano

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One-Dimensional Porous Li-Confinable Hosts for High-Rate and Stable Li-Metal Batteries
ACS Nano ( IF 15.8 ) Pub Date : 2022-06-23 , DOI: 10.1021/acsnano.2c01309
Dong Woo Kang ₁ , Seong Soo Park ₂ , Hong Jun Choi ₁ , Jun-Ho Park ₁ , Ji Hoon Lee ₃ , Sang-Min Lee ₄ , Jeong-Hee Choi _{1,

5} , Janghyuk Moon ₂ , Byung Gon Kim _{1,

5}

Affiliation

Li-confinable core–shell hosts have been extensively studied because they mitigate Li dendrite growth and volume change by reducing the effective current density and storing Li inside the core space during consecutive cycling. However, despite these fascinating features, these hosts suffer from unwanted Li growth on their surface (i.e., top plating) due to the carbon shell hindering Li-ion movement especially at higher current densities and capacities, resulting in poor electrochemical performance. In this study, we propose a one-dimensional porous Li-confinable host with lithiophilic Au (Au@PHCF), which is synthesized by a scalable dual-nozzle electrospinning. Because of the well-interconnected conductive networks forming three-dimensional structure, porous shell design enabling facile Li-ion transport, and hollow core space with lithiophilic Au storing metallic Li, the Au@PHCF can suppress the Li top plating and improve the Li stripping/plating efficiency compared to their counterparts even at 5 mA cm^–2, eventually achieving stable cycling performances of the LiFePO₄ full cell and Au@PHCF-Li symmetric cell for over 1000 and 2000 cycles, respectively. Finite element analysis reveals that the structural merit and lithiophilicity of Au enable fast reversible Li operation at the designated core space of the Au@PHCF, implying that the structural design of the Li-confinable host is crucial for the stable operation of promising Li-metal batteries at a practical test level.

中文翻译：

用于高倍率和稳定锂金属电池的一维多孔锂限制主体

限制锂的核壳主体已被广泛研究，因为它们通过降低有效电流密度和在连续循环过程中将锂储存在核空间内来减轻锂枝晶生长和体积变化。然而，尽管有这些令人着迷的特征，但由于碳壳阻碍了锂离子的运动，这些主体的表面（即顶层电镀）会出现不需要的锂生长，尤其是在较高的电流密度和容量下，从而导致电化学性能较差。在这项研究中，我们提出了一种具有亲锂 Au (Au@PHCF) 的一维多孔 Li-confineable 主体，它是通过可扩展的双喷嘴静电纺丝合成的。由于相互连接良好的导电网络形成三维结构，多孔壳设计使锂离子传输变得容易，^–2，最终实现LiFePO ₄全电池和Au@PHCF-Li对称电池分别超过1000次和2000次循环的稳定循环性能。有限元分析表明，Au 的结构优点和亲锂性使其能够在 Au@PHCF 的指定核心空间实现快速可逆的 Li 操作，这意味着 Li-confinable 主体的结构设计对于有前途的 Li-metal 的稳定运行至关重要电池处于实际测试水平。

更新日期：2022-06-23

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