期刊
APPLIED SURFACE SCIENCE
卷 447, 期 -, 页码 442-451出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.04.004
关键词
Si anode; PAA binder; EDTA; Li-ion batteries; Thermal stability
类别
资金
- Human Resource Training Program for the Regional Innovation and Creativity, through the Ministry of Education and the National Research Foundation of Korea [NRF-2014H1C1A1073093]
- R&D Convergence Program of the National Research Council of Science & Technology (NST) of the Republic of Korea [CAP-15-02-KBSI]
The crucial roles of ethylenediaminetetraacetic acid (EDTA) in the poly(acrylic acid) (PAA)-binder system were investigated for the high electrochemical performance silicon anode in lithium-ion batteries. The EDTA supports the construction of a mechanically robust network through the formation of sbndCOOH linkage with the SiO2 layer of the Si nanoparticles. The mixture of the PAA/EDTA binder and the conductive agent exhibited an improved elastic modulus and peeling strength. The creation of hydrogen fluoride (HF) was effectively suppressed through the elimination of the H2O. An H2O-phosphorous pentafluoride (PF5) reaction, which is known for its use in the etching of metal oxides including its creation of the solid electrolyte interphase (SEI) layer, generates the HF. A remarkably sound cyclability with a discharge capacity of 2540 mA h g(-1) was achieved as a result of the synergistic effect between robust mechanical properties and suppression of the HF creation for the stability of the SEI layer. (C) 2018 Elsevier B.V. All rights reserved.
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