Journal
JOURNAL OF POWER SOURCES
Volume 348, Issue -, Pages 229-238Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.02.085
Keywords
Polymer ceramic separator; Nano-CeO2; Nano-content; High voltage lithium-ion batteries; Electrochemical stability
Funding
- National Natural Science Foundation of China [21403076]
- Natural Science Foundation of Guangdong Province [2014A030310324]
- scientific research project of Department of Education of Guangdong Province [2013CXZDA013]
- Pearl River S&T Nova Program of Guangzhou [201610010044]
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Currently, the suitable proportion of inorganic particles in the ceramic separator has not been reported yet, due to the contradictory about the content of nano-particles in research papers (10 wt.%) and commercial application (large amount) [1,2]. In this paper, the nano-CeO2 contents on the properties of polyethylene (PE)-supported separator coating with poly (methyl methacrylate-butyl acrylate-acrylonitrile-styrene) (P(MMA-BA-AN-St)) copolymer is investigated systematically used in high voltage batteries for the first time. Since the copolymer contributes to high electrolyte uptake, and nano-CeO2 dedicates dimensional stability, the separator with 10 wt.% nano-CeO2 shows the highest ionic conductivity (2.5 x 10(-3) S cm(-1)) at room temperature and the maximal electrolyte uptake (81.0 g m(-2)), while the separator with 100 wt.% nano-CeO2 exhibits better mechanical strength (52 MPa) and smaller shrinkage percentage (36%). Successively, cyclic performance of Li/LiNi0.5Mn1.5O4 cells indicates that the capacity retention of the cell using separator with 100 wt.% nano-CeO2 (72%) is second only to that with 10 wt.% nano-CeO2 (74%) after 200 cycles at 0.2 C between 3 V and 5 V, far larger than that without doping nano-CeO2 (51%) and PE (40%). By the consideration both of comprehensive performances and economic cost, 100 wt.% content is regarded as the most suitable appending proportion. (C) 2017 Elsevier B.V. All rights reserved.
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