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A New PVH Based Hyperbranched Polyzwitterion Electrolyte for Lithium-Ion Batteries
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DOI：10.1002/pen.70692.png)
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Abstract
En 中文
Firstly, the third-generation hyperbranched polymer with thiol groups at the ends was synthesized by the method of A2 + B3. Then, it was reacted with 3-{dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]-azaniumyl}propane-1-sulfonate (SBMA) to obtain a hyperbranched polymer with SBMA at the ends (HBP). Finally, different volumes of solution HBP and lithium chloride were added to poly(vinylidene fluoride-hexafluoropropylene) (PVH) solution, and after vacuum drying, a series of solid polymer electrolytes were obtained. The structures of the hyperbranched polymers and electrolytes were characterized by 1H nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FT-IR). The mechanical properties of the electrolytes were tested by tensile tests. The thermal properties were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The electrochemical properties were characterized using an electrochemical workstation and Land test instrument. The results show that when the content of HBP is 30% and lithium chloride is 2.0%, the electrolytes have excellent mechanical and thermal properties. The PVH-HBP30-LiCl2.0 has a stable electrochemical window of 4.7 V, and its ionic conductivity is around 6.4 × 10−4 S cm−1 at room temperature. The assembled LiFePO4|PVH-HBP30-LiCl2.0|Li cell maintains a highly reversible capacity and excellent cycling performance after cycling at 0.5°C for 200 times.
Keywords:
hyperbranched polymer
lithium-ion battery
polyzwitterion
solid polymer electrolyte
synthesis
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