电解质
电化学
阴极
X射线光电子能谱
介电谱
钝化
锂(药物)
化学工程
电化学窗口
材料科学
无机化学
化学
电极
纳米技术
物理化学
离子电导率
图层(电子)
内分泌学
工程类
医学
作者
Shiyou Li,Dongni Zhao,Peng Wang,Xiaoling Cui,Fengjuan Tang
标识
DOI:10.1016/j.electacta.2016.11.022
摘要
To satisfy the need of 5 V high-voltage cathode materials, lithium difluoro(oxalato)borate (LiDFOB) with excellent film-forming property has been chosen as lithium salt, and adiponitrile (ADN) with stable electrochemical performance has been evaluated as functional additive. An electrochemical investigation of this novel electrolyte solution shows a wide electrochemical oxidation window of nearly 6.0 V vs Li+/Li. Due to the positive effect of ADN on the cathode/electrolyte interface, LiNi0.5Mn1.5O4/Li half-cell with ADN-adding electrolyte exhibits prominent rate capability and cyclability. It is believed that the improvement of electrochemical performances has benefitted greatly from interfacial impedance reducing. Two modeling hypotheses have been used to explain interfacial interaction between ADN and LiNi0.5Mn1.5O4, by the means of analysis of X-ray photoelectron spectroscopy and theoretical calculation. Results show that ADN can enrich the surface of cathode material to hinder the further decomposition of the electrolyte, and contribute to the formation of a cathode-electrolyte interface passivation film with protective and conductive properties.
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