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Regulating Anions in the Solvation Sheath of Lithium Ions for Stable Lithium Metal Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-01-07 00:00:00 , DOI: 10.1021/acsenergylett.8b02376 Xue-Qiang Zhang 1 , Xiang Chen 1 , Li-Peng Hou 1 , Bo-Quan Li 1 , Xin-Bing Cheng 1 , Jia-Qi Huang 2 , Qiang Zhang 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-01-07 00:00:00 , DOI: 10.1021/acsenergylett.8b02376 Xue-Qiang Zhang 1 , Xiang Chen 1 , Li-Peng Hou 1 , Bo-Quan Li 1 , Xin-Bing Cheng 1 , Jia-Qi Huang 2 , Qiang Zhang 1
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Safe lithium (Li) metal batteries have been plagued by dendrite growth due to a heterogeneous solid electrolyte interphases (SEI) on the Li metal anode. Modulating the solvation sheath of Li ions enhances the uniformity and stability of SEI significantly. However, anion regulation in the solvation sheath for constructing stable SEI is rarely touched. Herein, the solvation structure of original bis(fluorosulfonyl)imide (FSI–) anions in the solvation sheath is altered by introduction of other anions, promoting the complete decomposition of FSI– and forming a stable SEI on the Li metal anode. Moreover, both the oxidation stability window of the electrolyte and current collector protection were enhanced. Furthermore, the components and structure of the solvation sheath were disclosed by combining 17O nuclear magnetic resonance and molecular dynamics simulations. This work provides fresh insight into the interrelation among various anions on regulating the solvation sheath of Li ions and demonstrates guidance in rationally designing electrolytes for stable and safe Li metal batteries.
中文翻译：
稳定锂金属电池的锂离子溶剂化鞘中的阴离子调节
由于锂金属阳极上的异质固体电解质中间相（SEI），枝晶生长会困扰安全的锂（Li）金属电池。调节锂离子的溶剂化鞘层可显着提高SEI的均匀性和稳定性。然而，在溶剂化鞘中用于构建稳定的SEI的阴离子调节很少涉及。在此，通过引入其他阴离子改变了原来的双（氟磺酰基）酰亚胺（FSI –）阴离子在溶剂化鞘中的溶剂化结构，从而促进了FSI –的完全分解。并在锂金属阳极上形成稳定的SEI。此外，电解质的氧化稳定性窗口和集电器保护均得到增强。此外，结合了17 O核磁共振和分子动力学模拟，揭示了溶剂化鞘的成分和结构。这项工作为调节锂离子的溶剂化鞘层中各种阴离子之间的相互关系提供了新的见解，并为合理设计稳定，安全的锂金属电池的电解质提供了指导。
更新日期：2019-01-07
中文翻译：
稳定锂金属电池的锂离子溶剂化鞘中的阴离子调节
由于锂金属阳极上的异质固体电解质中间相（SEI），枝晶生长会困扰安全的锂（Li）金属电池。调节锂离子的溶剂化鞘层可显着提高SEI的均匀性和稳定性。然而，在溶剂化鞘中用于构建稳定的SEI的阴离子调节很少涉及。在此，通过引入其他阴离子改变了原来的双（氟磺酰基）酰亚胺（FSI –）阴离子在溶剂化鞘中的溶剂化结构，从而促进了FSI –的完全分解。并在锂金属阳极上形成稳定的SEI。此外，电解质的氧化稳定性窗口和集电器保护均得到增强。此外，结合了17 O核磁共振和分子动力学模拟，揭示了溶剂化鞘的成分和结构。这项工作为调节锂离子的溶剂化鞘层中各种阴离子之间的相互关系提供了新的见解，并为合理设计稳定，安全的锂金属电池的电解质提供了指导。
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