期刊
ELECTROCHIMICA ACTA
卷 317, 期 -, 页码 146-154出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.05.027
关键词
1-ethyl-3-methylimidazolium tetrafluoroborate; Electrolyte additive; LiNi0.5Co0.2Mn0.3O2 (NCM523)/graphite batteries; Low-temperature performance
资金
- National Natural Science Foundation of China [21875077, 21875076]
- Scientific and Technological Plan Projects of Guangzhou City [2019-01-01-12-1006-0020]
- Zhuhai City
A 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4) ionic liquid is introduced into an electrolyte as a functional additive to enhance the low-temperature performance of LiNi0.5Co0.2Mn0.3O2 (NCM523)/graphite batteries. Linear sweep voltammetry (LSV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) tests show that EMI-BF4 can be oxidized in advance and produce low impedance solid-electrolyte interphase (SEI) films on the electrode surfaces. Compared with the batteries without the EMI-BF4 additive, the capacity retention of the NCM523/graphite batteries with 1% EMI-BF4 additive is enhanced from 82.3% to 93.8% after 150 cycles at a low temperature of -10 degrees C. In addition, at -30 degrees C, the discharge capacity of the batteries with 1% EMI-BF4 additive is nearly doubled. And at the room temperature of 25 degrees C and after 400 cycles, the capacity retention also increases from 80.3% to 85.9%, and the coulomb efficiency remains at approximately 100%. These results demonstrate that EMI-BF4 used as a functional electrolyte additive has promising prospects for application to improve the low-temperature performance of NCM523-based lithium-ion batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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