Department of Chemistry, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
Department of Hematology, Internal Medicine, University of Texas Houston Medical School, Houston, TX, 77030, USA.
Adv Mater. 2018 Dec;30(50):e1803869. doi: 10.1002/adma.201803869. Epub 2018 Oct 17.
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 . 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.
对可持续和离网储能的需求不断增长，促使人们重新尝试将金属锂用作下一代电池的阳极。然而，由于在充电和放电过程中锂枝晶的生长，锂阳极的使用受到阻碍，这会影响电池的寿命和安全性。本文表明，锂化多壁碳纳米管（Li-MWCNTs）作为一种受控的锂扩散界面，通过在 2 至 4 mA cm 的电流密度下调节充电/放电循环期间的锂离子通量，抑制了锂枝晶的生长。制备了全 Li-S 电池以展示具有 Li-MWCNT 界面的受保护 Li 阳极的多功能性，其中全电池可以支持高电流的脉冲放电，并且在不同的倍率下可以循环超过 450 次，库仑效率接近 99.9%。这项工作表明，锂化形式的碳材料可能是一种有效且简单的方法，可以稳定锂金属阳极。
