期刊
SOLID STATE SCIENCES
卷 13, 期 5, 页码 824-830出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2011.03.015
关键词
TOF-SIMS; Polypyrrole; Polyethylene glycol; LiFePO4; Lithium-ion batteries
资金
- Slovak Grant Agency VEGA [1/0011/11, 1/0134/10]
- Deutsche Forschungsgemeinschaft [WI 952, DFG-PAK 177]
- Slovak Research and Development Agency [VVCE-0070-07]
- CE GreenII ITMS [26240120025]
The role of polyethylene glycol (PEG) in mixed polypyrrole (PPy) polymer blend for new cathode material used in Li-ion battery has been studied. The films of PPy containing PEG were prepared by chemical oxidative polymerization of pyrrole (Py) monomer. PEG has been applied as an additive during polymerization process to improve mechanical and structural properties of PPy in final PPy/PEG-LiFePO4 cathode material aiming also better electronic conductivity. The electrochemical behavior of the samples was examined by galvanostatic charge/discharge technique and cyclic voltammetry (CV). It was found that PPy/PEG blend polymer decreases the contact resistance and improves the Li+ intercalation/deintercalation during cycling. Charge/discharge measurements confirmed the increase in capacity when applying PEG in PPy. Time of flight secondary ion mass spectrometry (TOF-SIMS) analysis. confirmed supporting effect of PEG in PPy predominantly for mixed polymer mechanical stability (important at charging cycles). Distribution of PPy. PEG and Li+ fragments within blended polymer films were monitored by measuring the intensities of different secondary ions, applying SIMS. (C) 2011 Elsevier Masson SAS. All rights reserved.
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