电解质
材料科学
相间
琥珀酸酐
介电谱
阴极
化学工程
电化学
钠
阳极
电极
复合材料
化学
冶金
工程类
物理化学
生物
遗传学
作者
Jie Fan,Peng Dai,Chenguang Shi,Yanfen Wen,Chenxu Luo,Jian Yang,Cun Yi Song,Ling Huang,Shi‐Gang Sun
标识
DOI:10.1002/adfm.202010500
摘要
Abstract The electrolyte additive plays an important role in determining the crucial properties of batteries such as cycling stability and safety. Compared to material development, research on electrolyte and interphase is still in the early stage for sodium ion batteries (SIBs). Herein, for the first time, succinic anhydride (SA) is investigated as a synergistic filming additive to fluoroethylene carbonate (FEC), and the lifespan of the dual‐additive Na/Na 0.6 Li 0.15 Ni 0.15 Mn 0.55 Cu 0.15 O 2 (NLNMC) cell is significantly improved, maintaining capacity retention of 87.2% over 400 cycles at 1 C rate. For comparison, the batteries with only one of the two additives or without any additive show much inferior electrochemical performance. After the addition of SA, the interphase layer on the surface of cycled NLNMC material becomes uniform and stable, which contains more oxygen‐rich organic species and less NaF. Additionally, the addition of SA also has an impact on the interphase layer in the sodium anode part as indicated by electrochemical impedance spectroscopy (EIS) and energy dispersive spectrometer (EDS) results. Moreover, the online differential electrochemical mass spectrometry (OEMS) tests show the dual‐additive cell has less CO 2 generation during the initial two cycles compared to that with only FECs which demonstrates another advantage of SA for practical application.
科研通智能强力驱动
Strongly Powered by AbleSci AI