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首页> 外文期刊>International Journal of Electrochemical Science >N,N-diethyl-trimethylsilylamine as an Electrolyte Additive for Enhancing Electrochemical Performance of High Voltage Spinel Cathode
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N,N-diethyl-trimethylsilylamine as an Electrolyte Additive for Enhancing Electrochemical Performance of High Voltage Spinel Cathode

机译：N，N-二乙基-三甲基甲硅烷基胺作为增强高压尖晶石阴极电化学性能的电解质添加剂

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摘要

In this work, N,N-diethyl-trimethylsilylamine (EMSA) is used as an electrolyte additive for a 5 V-class high voltage LiNi0.5Mn1.5O4 cathode. In presence of 0.5 wt.% EMSA, Li/LiNi0.5Mn1.5O4 cell exhibits an attractive cycling performance compared to the cell without EMSA, improving the discharge capacity retention from 76.1 % to 84.9% after 500 cycles at 1 C and 25 ?C, and from 52.4% to 94.8% after 100 cycles at 0.5 C and 55 ?C. 19F nuclear magnetic resonance (19F NMR), inductively coupled plasma atomic emission spectrometry (ICP-AES) and X-ray photoelectron spectroscopy (XPS) studies reveal that EMSA serves as a hydrofluoric acid scavenger to alleviate the dissolution of Mn and Ni ions from LiNi0.5Mn1.5O4 cathode and the concurrent decomposition of electrolyte. As a result, the stability of the cathode/electrolyte interface and cycling performance of LiNi0.5Mn1.5O4 are significantly improved. Moreover, the superior cycling performance of a Li/graphite cell with EMSA is also achieved because the surface film modified by EMSA allows facile charge transfer.
机译：在这项工作中，N，N-二乙基三甲基甲硅烷基胺（EMSA）被用作5 V级高压LiNi0.5Mn1.5O4阴极的电解质添加剂。与不使用EMSA的电池相比，在有0.5 wt。％EMSA的情况下，Li / LiNi0.5Mn1.5O4电池展现出诱人的循环性能，在1 C和25°C下经过500次循环后，放电容量保持率从76.1％提高到84.9％在0.5 C和55°C下进行100次循环后，从52.4％降至94.8％。 19F核磁共振（19F NMR），电感耦合等离子体原子发射光谱（ICP-AES）和X射线光电子能谱（XPS）研究表明EMSA可作为氢氟酸清除剂以减轻LiNi0中Mn和Ni离子的溶解.5Mn1.5O4阴极与电解液同时分解。结果，显着改善了阴极/电解质界面的稳定性和LiNi0.5Mn1.5O4的循环性能。此外，由于通过EMSA改性的表面膜允许轻松的电荷转移，因此使用EMSA的锂/石墨电池也具有出色的循环性能。

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