Suppressing Li Metal Dendrites Through a Solid Li-Ion Backup Layer
Suppressing Li Metal Dendrites Through a Solid Li-Ion Backup Layer
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DOI：
10.1002/adma.201803869
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发表时间：
2018-12-13
影响因子：
29.4
通讯作者：
Tour, James M.
中科院分区：
文献类型：
--
作者：
Salvatierra, Rodrigo, V;Lopez-Silva, Gladys A.;Tour, James M.
对可持续和离网储能的需求不断增长，正在重新尝试在下一代电池中使用锂金属作为阳极。然而，由于锂枝晶在充放电过程中生长，阻碍了锂阳极的使用，影响了电池的使用寿命和安全性。本研究表明，锂化多壁碳纳米管（Li- mwcnts）作为受控的Li扩散界面，在2 ~ 4 mA cm（-2）的电流密度下，通过调节充放电循环过程中的Li+离子通量来抑制Li枝晶的生长。一个完整的Li- s电池被制造出来，以展示具有Li- mwcnt界面的保护锂阳极的多功能性，其中完整的电池可以支持高电流脉冲放电，并以不同的速率超过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。
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.