A propylene carbonate based gel polymer electrolyte for extended cycle life and improved safety performance of lithium ion batteries
| Autor: | Martin Winter, Katharina Rudolf, Ralf Wagner, Isidora Cekic-Laskovic, Natascha von Aspern, Uta Rodehorst, Hao Jia, Bastian Billmann, Hitoshi Onishi |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology Salt (chemistry) chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Propylene carbonate Thermal stability Lithium Graphite Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 397:343-351 |
| ISSN: | 0378-7753 |
| Popis: | A poly(vinylidene difluoride-co-hexafluoropropylene) (PVdF-HFP)-based gel polymer electrolyte (GPE) containing propylene carbonate (PC)-based liquid electrolyte was developed to enhance the safety performance of LiNi0.5Mn0.3Co0.2O2/graphite (NMC532/graphite) lithium ion batteries. The PC-based liquid electrolyte (PEV-LE) consists of 1 mol L−1 LiPF6 as lithium salt, PC as the main solvent and ethylene sulfite (ES, 2% by weight) as well as vinylene carbonate (VC, 2% by weight) as solid electrolyte interphase (SEI) forming additives. Electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) revealed that the combination of ES and VC additives facilitates the formation of effective interphases at the respective electrolyte/electrode interfaces, thus contributing to a remarkable cycle life of NMC532/graphite cell comprising PEV-GPE. Flash point measurements and differential scanning calorimetry (DSC) confirmed significantly improved safety performance of PEV compared to the state-of-the-art electrolyte. PEV-GPE is a promising alternative to state-of-the-art electrolyte as it shows extended cycle life and enhanced thermal stability in NMC532/graphite lithium ion cells. |
| Databáze: | OpenAIRE |
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