Influence of lithium-cyclo-difluoromethane-1,1-bis(sulfonyl)imide as electrolyte additive on the reversibility of lithium metal batteries
Influence of lithium-cyclo-difluoromethane-1,1-bis(sulfonyl)imide as electrolyte additive on the reversibility of lithium metal batteries
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DOI：
10.1007/s10800-016-0924-6
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发表时间：
2016-01
影响因子：
2.9
通讯作者：
P. Murmann;M. Börner;I. Cekic‐Laskovic;M. Winter
中科院分区：
文献类型：
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作者：
P. Murmann;M. Börner;I. Cekic‐Laskovic;M. Winter
本文设计了一种含锂-环二氟甲烷-1，1-双（磺酰基）酰亚胺（LiDMSI）作为添加剂的电解质溶液，用于铜电极上锂电镀-剥离模型实验的测量。将LiDMSI实施到两种不同的电解质溶液中。第一电解质设置由作为电解质的LiTFSI在PC中的IM溶液组成，已知其对于可逆Li沉积显示出受限制的性能。第二种设置包括在1，3-二氧戊环中的IM LiAsF 6作为基础电解质，其描绘了锂沉积-溶解的良好测试性能。添加LiDMSI在两种电解质组合物中的库仑效率和循环稳定性方面产生显著改善的结果。此外，它否定了高表面积的形成，例如，树枝状锂，其描述了可再充电锂金属电池有限安全性的主要来源。在基于PC的电解质系统的情况下，含LiDMSI的电解质示出了在铜基板上略微降低的过电位，而对于基于二氧戊环的设置，过电位几乎完全相等。为了比较锂沉积物的形态，使用SEM图像。图形摘要
AbstractElectrolyte solutions containing lithium-cyclo-difluoromethane-1,1-bis(sulfonyl)imide (LiDMSI) as an additive were specifically designed for measurements in lithium plating-stripping model experiments on copper electrodes. LiDMSI was implemented into two different electrolyte solutions. The first electrolyte setup consisted of a 1 M solution of LiTFSI in PC as an electrolyte which is known to show a comparably limited performance for reversible Li deposition. The second setup was comprised 1 M LiAsF6in 1,3-dioxolane as the base electrolyte which depicts a well-tested performance for lithium deposition–dissolution. The addition of LiDMSI yielded significantly improved results in regard to Coulombic efficiencies and cycling stability in both electrolyte compositions. Furthermore, it negated the formation of high surface area, e.g., dendritic lithium, which depicts the main source for the limited safety of rechargeable lithium metal batteries. In the case of the PC-based electrolyte system, the LiDMSI-containing electrolyte illustrates a slightly lowered over-potential on the copper substrate, while for the dioxolane-based setup the over-potentials were almost completely equal. In order to compare the morphologies of the lithium deposits, SEM images were utilized.Graphical Abstract