期刊
ELECTROCHIMICA ACTA
卷 169, 期 -, 页码 334-341出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.04.039
关键词
Li-ion batteries; Solid polymer electrolytes; Ionic conductivity; Mechanical property; Thermal shrinkage
资金
- National Natural Science Foundation of China [50803008]
- Natural Science Foundation of Hunan [14JJ4035, 2011RS4067]
- State Key Laboratory of Luminescent Materials and Devices at South China University of Technology [2013-skllmd-08]
- China Postdoctoral Science Foundation [201104508]
This paper presents the preparation and characterization of a series of PEO-PMMA composites containing different lithium salts (LiClO4 or LiTFSI) with or without nano-Al2O3. Nano-Al2O3 is added to the polymer electrolytes to alter the morphology, ionic conductivity, interfacial and thermal shrinkage properties. Nano-Al2O3 can effectively improve the stability of the polymer electrolyte membrane interface. The tensile strength of the PEO-PMMA-LiTFSI-Al2O3 electrolyte membrane is 3.24 MPa at room temperature. The study shows that the ion conductivities at room temperature for PEO-PMMA-LiTFSI (EO/Li+ = 10) and PEO-PMMA-LiTFSI-Al2O3 (EO/Li+ = 10) are 6.71 x 10(-7) S/cm and 9.39 x 10(-7) S/cm, respectively. A good dimensional stability was observed for PEO-PMMA-LiTFSI with a thermal shrinkage of 8.7%. The electrochemical windows of PEO-PMMA-LiTFSI and PEO-PMMA-LiTFSI-Al2O3 are all stable up to 4.6 V versus Li+/Li, which makes them good electrolyte candidates of lithium ion batteries with high-potential cathodes. (C) 2015 Elsevier Ltd. All rights reserved.
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