The interplay between solid electrolyte interface (SEI) and dendritic lithium growth
The interplay between solid electrolyte interface (SEI) and dendritic lithium growth
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DOI：
10.1016/j.nanoen.2017.08.005
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发表时间：
2017-10-01
期刊：
影响因子：
17.6
通讯作者：
Xiao, Jie
中科院分区：
文献类型：
--
作者：
Wu, Bingbin;Lochala, Joshua;Xiao, Jie
锂金属电池中形成的锂枝晶可分为两种不同类型。一种是有害的锂枝晶，它会朝向隔膜，有可能导致电池短路。另一种是在块状锂金属中形成的不明确的纤维状锂。有害的锂枝晶可能会导致电池短路，而被SEI覆盖的其他枝晶主要增加电池阻抗并终止电池运行，最常见的是在任何“短路”真正发生之前。如果不将这两种不同的锂枝晶解耦，就很难开发出任何有效的方法来实现稳定和安全的锂金属电池。在此，提出了一种直接的方法来诱导有害的树突状锂的生长，从而使电池频繁且一致地“短路”。基于这一新协议，重新审视了各种电解质，并对得出的 SEI 进行了比较和量化，为应对可充电锂金属电池技术的挑战提供了新的见解。
Li dendrite formed in Li metal batteries can be categorized into two different types. One is the detrimental Li dendrite that heads towards the separator with a potential to short cell. The other is the ill-defined fibrous Li formed within bulk Li metal. The detrimental Li dendrite may cause cell short, while the other dendrites, covered by SEI, mainly increase cell impedance and terminate the cell operation, most often, before any "short" really happens. Without decoupling these two different Li dendrites, it is hard to develop any effective approach to realize both stable and safe Li metal batteries. Herein, a straightforward approach is proposed to induce the growth of detrimental dendritic Li so the cells are "shorted" frequently and consistently. Based on this new protocol, various electrolytes are revisited and the SEI derived are compared and quantified, providing new insights for addressing the challenges in rechargeable Li metal battery technologies.