Suppressing Li Metal Dendrites Through a Solid Li‐Ion Backup Layer,Advanced Materials

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Suppressing Li Metal Dendrites Through a Solid Li‐Ion Backup Layer
Advanced Materials ( IF 27.4 ) Pub Date : 2018-10-17 , DOI: 10.1002/adma.201803869
Rodrigo V. Salvatierra ₁ , Gladys A. López‐Silva ₁ , Almaz S. Jalilov ₁ , Jongwon Yoon ₁ , Gang Wu ₂ , Ah‐Lim Tsai ₂ , James M. Tour _{1,

3,

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Affiliation

The growing demand for sustainable and off‐grid energy storage is reviving the attempts to use Li metal as the anode in the next generation of batteries. However, the use of Li anodes is hampered due to the growth of Li dendrites upon charging and discharging, which compromises the life and safety of the battery. Here, it is shown that lithiated multiwall carbon nanotubes (Li‐MWCNTs) act as a controlled Li diffusion interface that suppresses the growth of Li dendrites by regulating the Li⁺ ion flux during charge/discharge cycling at current densities between 2 and 4 mA cm⁻². A full Li‐S cell is fabricated to showcase the versatility of the protected Li anode with the Li‐MWCNT interface, where the full cells could support pulse discharges at high currents and over 450 cycles at different rates with coulombic efficiencies close to 99.9%. This work indicates that carbon materials in lithiated forms can be an effective and simple approach to the stabilization of Li metal anodes.

中文翻译：

通过固态锂离子备用层抑制锂金属枝晶

对可持续和离网储能的需求不断增长，正在复兴使用锂金属作为下一代电池阳极的尝试。然而，由于在充电和放电时Li树枝状晶体的生长，阻碍了Li阳极的使用，这损害了电池的寿命和安全性。此处显示，锂化多壁碳纳米管（Li-MWCNT）充当受控的Li扩散界面，通过在2至4 mA cm的电流密度下在充电/放电循环期间调节Li ⁺离子通量来抑制Li树枝状晶体的生长⁻²。制作了一个完整的Li-S电池以展示具有Li-MWCNT界面的受保护锂阳极的多功能性，在该电池中，该完整电池可支持高电流脉冲放电和以不同速率进行超过450次循环，库仑效率接近99.9％。这项工作表明，锂化形式的碳材料可以成为稳定锂金属阳极的一种有效而简单的方法。

更新日期：2018-10-17

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