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Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-10-11 , DOI: 10.1021/acsenergylett.1c01999 Oh B. Chae 1 , Venkata A. K. Adiraju 1 , Brett L. Lucht 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-10-11 , DOI: 10.1021/acsenergylett.1c01999 Oh B. Chae 1 , Venkata A. K. Adiraju 1 , Brett L. Lucht 1
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Lithium cyano tris(2,2,2-trifluoroethyl) borate (LCTFEB) has been synthesized and investigated as a new electrolyte additive for high-performance lithium metal batteries. LCTFEB is prepared by the reaction of tris(2,2,2-trifluoroethyl) borate with lithium cyanide. The incorporation of LCTFEB into a carbonate-based electrolyte has been investigated. The electrochemical performance of NCM523/Li cells and symmetric Li/Li cells is significantly improved upon the incorporation of LCTFEB (5 wt %) into the electrolyte. Various characterizations of the lithium metal morphology and the solid electrolyte interphase (SEI) on the lithium metal anode have been conducted using field-emission scanning electron microscopy, cryogenic transmission electron microscopy, and X-ray photoelectron spectroscopy, suggesting the generation of a thin (∼10 nm) LiF-rich SEI with low concentrations of B and N compounds. The different SEI structures are formed by the preferential reductive decomposition of LCTFEB, resulting in improved electrochemical performance. The new electrolyte additive provides insight into innovative approaches for multifunctional electrolyte additive design.
中文翻译：
氰基三（2,2,2-三氟乙基）硼酸锂作为高性能锂金属电池的多功能电解质添加剂
已经合成并研究了氰基三（2,2,2-三氟乙基）硼酸锂（LCTFEB）作为高性能锂金属电池的新型电解质添加剂。LCTFEB 是由硼酸三（2,2,2-三氟乙基）酯与氰化锂反应制备的。已经研究了将 LCTFEB 加入碳酸盐基电解质中。NCM523/Li 电池和对称 Li/Li 电池的电化学性能在将 LCTFEB（5wt%）掺入电解质后显着提高。使用场发射扫描电子显微镜、低温透射电子显微镜和 X 射线光电子能谱对锂金属负极上的锂金属形态和固体电解质界面 (SEI) 进行了各种表征，表明生成具有低浓度 B 和 N 化合物的薄（~10 nm）富含 LiF 的 SEI。LCTFEB 的优先还原分解形成了不同的 SEI 结构，从而提高了电化学性能。新型电解质添加剂为多功能电解质添加剂设计的创新方法提供了见解。
更新日期：2021-11-12
中文翻译：
氰基三（2,2,2-三氟乙基）硼酸锂作为高性能锂金属电池的多功能电解质添加剂
已经合成并研究了氰基三（2,2,2-三氟乙基）硼酸锂（LCTFEB）作为高性能锂金属电池的新型电解质添加剂。LCTFEB 是由硼酸三（2,2,2-三氟乙基）酯与氰化锂反应制备的。已经研究了将 LCTFEB 加入碳酸盐基电解质中。NCM523/Li 电池和对称 Li/Li 电池的电化学性能在将 LCTFEB（5wt%）掺入电解质后显着提高。使用场发射扫描电子显微镜、低温透射电子显微镜和 X 射线光电子能谱对锂金属负极上的锂金属形态和固体电解质界面 (SEI) 进行了各种表征，表明生成具有低浓度 B 和 N 化合物的薄（~10 nm）富含 LiF 的 SEI。LCTFEB 的优先还原分解形成了不同的 SEI 结构，从而提高了电化学性能。新型电解质添加剂为多功能电解质添加剂设计的创新方法提供了见解。
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