Electron-beam-irradiated polyethylene membrane with improved electrochemical and thermal properties for lithium-ion batteries
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The effects of electron-beam irradiation on the physicochemical and electrochemical properties of polyethylene (PE) separators are investigated. The high-energy electron-beam irradiation creates carbonyl bands on the surface of bare PE separators, however, it does not affect morphology and pore structure of the separators. In addition, cells employing the electron-beam-irradiated PE separators clearly exhibit better ionic conductivity and rate capability without any degradation in cycling performance compared to cells employing the bare PE separator. This improvement is explained by a formation of new functional group on PE surface—the electron-beam irradiation creates carbonyl group on the surface of the PE separator and it readily facilitates the migration of Li+ and improves solvent affinity of the PE separators. Furthermore, the thermal stability of PE separators is effectively enhanced by irradiating them with electron beams. The thermal shrinkage of the electron-beam-irradiated PE separators is observed to be much lower than that of bare PE separators, resulting in an increased gap between the shut-down and melting integrity temperatures. From these results, it is believed that the electron-beam irradiation can be considered as an effective approach to enhance electrochemical and thermal properties of PE separator.
KeywordsElectron-beam irradiation PE separator Lithium-ion battery Thermal and electrochemical properties
This work was supported by the Energy Efficiency and Resources program of the Korea Institute of Energy Technology Evaluation and Planning (Project No. 20112010100140) and R&D program (Project No. 10041942) of the Ministry of Trade, Industry, and Energy, Republic of Korea.
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