1. A propylene carbonate based gel polymer electrolyte for extended cycle life and improved safety performance of lithium ion batteries.
- Author
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Jia, Hao, Onishi, Hitoshi, von Aspern, Natascha, Rodehorst, Uta, Rudolf, Katharina, Billmann, Bastian, Wagner, Ralf, Winter, Martin, and Cekic-Laskovic, Isidora
- Subjects
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PROPYLENE carbonate , *LITHIUM-ion batteries , *POLYVINYLIDENE fluoride , *POLYELECTROLYTES , *X-ray photoelectron spectroscopy - Abstract
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 LiNi 0.5 Mn 0.3 Co 0.2 O 2 /graphite (NMC532/graphite) lithium ion batteries. The PC-based liquid electrolyte (PEV-LE) consists of 1 mol L −1 LiPF 6 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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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