The synergetic effect of lithium polysulfide and lithium nitrate to prevent lithium dendrite growth
The synergetic effect of lithium polysulfide and lithium nitrate to prevent lithium dendrite growth
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DOI：
10.1038/ncomms8436
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发表时间：
2015-06-01
影响因子：
16.6
通讯作者：
Cui, Yi
中科院分区：
文献类型：
--
作者：
Li, Weiyang;Yao, Hongbin;Cui, Yi
金属锂由于其高的理论比容量和低的负电化学电势，作为高能量存储系统的阳极材料显示出巨大的前景。不幸的是，不受控制的树枝状和苔藓状锂生长，以及锂金属基电池中固有的电解质分解，导致安全问题和低库仑效率。在这里，我们证明了锂枝晶的生长可以通过利用锂和多硫化锂之间的反应来抑制，这一直被认为是锂硫电池中的一个关键缺陷。我们发现，由于多硫化锂和硝酸锂作为添加剂在醚基电解质中的协同作用，形成了稳定和均匀的固体电解质界面层，防止枝晶生长并最大限度地减少电解质分解。我们的研究结果允许重新评估有关多硫化锂，硝酸锂和锂金属的反应，并为解决与锂金属阳极相关的问题提供见解。
Lithium metal has shown great promise as an anode material for high-energy storage systems, owing to its high theoretical specific capacity and low negative electrochemical potential. Unfortunately, uncontrolled dendritic and mossy lithium growth, as well as electrolyte decomposition inherent in lithium metal-based batteries, cause safety issues and low Coulombic efficiency. Here we demonstrate that the growth of lithium dendrites can be suppressed by exploiting the reaction between lithium and lithium polysulfide, which has long been considered as a critical flaw in lithium-sulfur batteries. We show that a stable and uniform solid electrolyte interphase layer is formed due to a synergetic effect of both lithium polysulfide and lithium nitrate as additives in ether-based electrolyte, preventing dendrite growth and minimizing electrolyte decomposition. Our findings allow for re-evaluation of the reactions regarding lithium polysulfide, lithium nitrate and lithium metal, and provide insights into solving the problems associated with lithium metal anodes.