Achieving stable interphases toward lithium metal batteries by a dilute and anion-rich electrolyte
Achieving stable interphases toward lithium metal batteries by a dilute and anion-rich electrolyte
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DOI：
10.1016/j.ensm.2023.102957
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发表时间：
2023-09
影响因子：
20.4
通讯作者：
Dandan Chai;Yazhen Zhu;Chaohong Guan;Tengxun Zhang;Shuai Tang;Hong Zhu;Xiang Li;Yongzhu Fu
中科院分区：
文献类型：
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作者：
Dandan Chai;Yazhen Zhu;Chaohong Guan;Tengxun Zhang;Shuai Tang;Hong Zhu;Xiang Li;Yongzhu Fu
寻找一种适用于高性能锂金属电池（LMB）的理想电解质是十分必要的。在此，我们构建了一个新的簇状和阴离子丰富的稀电解质体系，通过使用LiNO 3和微量三氟甲磺酸锂（LiOTf）在酯基电解质。在所设计的体系中，NO3-被用作调节剂来调节溶剂和阴离子的配位数，LiOTf被用作LiNO 3的增溶剂和大团簇生成的触发剂.结果，即使在稀释的Li离子浓度（<1.5M）下也获得阴离子调节的溶剂化结构（ARSS），这通过各种技术证明，使得电解质具有与高浓度电解质体系大不相同的高离子电导率。之后，ARSS促进在阴极和阳极上形成富含无机物的固体电解质界面（SEI），确保LMB的高稳定性和长循环性能。
It is necessary to find an ideal electrolyte suitable for high performance lithium metal batteries (LMBs). Herein, we construct a novel cluster-like and anion-rich dilute electrolyte system by using LiNO3and trace lithium trifluoromethanesulfonate (LiOTf) in an ester-based electrolyte. In the designed system, NO3–is used as a modulator to regulate the coordination number of solvents and anions, and LiOTf is applied as a solubilizing agent of LiNO3and trigger for the generation of large cluster. As a result, an anion-regulated solvation structure (ARSS) is obtained even in a dilute Li-ion concentration (<1.5 M), evidenced by various techniques, enabling the electrolyte a high ion-conductivity which vastly differs from a high concentration electrolyte system. Afterwards, the ARSS facilitates the formation of an inorganic-rich solid electrolyte interface (SEI) on both cathode and anode, ensuring the LMBs high stability and long cycling performance.