Pyridine group-containing lithium ion positive electrode aqueous binder and preparation method of binder, and lithium ion secondary battery
A pyridine group, secondary battery technology, applied in the field of electrochemistry, can solve the problems that cannot meet the requirements of emerging products, unfavorable to the theme of green energy, accelerate the decomposition of binders, etc., achieve excellent rate performance, save time and resources , the effect of slow dissolution rate
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Embodiment 1
[0044] This embodiment is a lithium ion cathode aqueous binder containing a pyridine group, a preparation method thereof, and a lithium ion secondary battery containing the same.
[0045] The preparation process of the above-mentioned lithium ion positive electrode aqueous binder is as follows:
[0046] Weigh 0.6303g polyethylene-Alt-maleic anhydride and 0.1672g p-toluenesulfonic acid in a flask, add 30ml solvent N,N-dimethylformamide (DMF) and 1.92ml 2-pyridinemethanol (polyethylene The molar ratio of acid anhydride units and 2-pyridinemethanol in maleic anhydride is 1:4), stirred and dissolved at room temperature, then heated to 100°C for reaction for 12 hours, and settled in acetone to obtain a solid; weigh 0.1g of anhydrous lithium hydroxide Prepare lithium hydroxide solution in 50ml of deionized water, add the solid obtained from the above precipitation into it, stir for 3 hours to make it fully lithiated, then transfer the solution into a dialysis bag and dialyze with de...
Embodiment 2
[0054] 0.2251g lithium ferrous phosphate (LiFePO 4 ), 0.0602g acetylene black, the 0.0151g binding agent PMY2 that above-mentioned embodiment 1 synthesizes according to 75wt%, 20wt%, the ratio of 5wt% makes positive electrode slurry, carries out coating, current collector is aluminum foil, after coating finishes, first Dry in an ordinary oven at 60°C for 6 hours, then dry in a vacuum oven at 80°C for 24 hours, and cut into circular electrode sheets with a diameter of 15mm after drying.
[0055] The circular electrode sheets obtained in Example 2 were assembled into CR2025 button batteries, wherein the negative electrode used was metal lithium sheets, the diaphragm was PP film, and the electrolyte solution was 1M LiPF 6 EC / DMC (1:1, vol%).
[0056] Figure 4 It is the battery cycle performance figure of the lithium ion battery made in embodiment 2 under 20C high current density. from Figure 4 It can be seen that although the electrode in the battery made in Example 2 uses ...
Embodiment 3
[0058] 0.2310g lithium ferrous phosphate (LiFePO 4 ), 0.0601g acetylene black, the 0.0092g binding agent PMY2 that above-mentioned embodiment 1 is synthesized according to 77wt%, 20wt%, the ratio of 3wt% makes positive electrode slurry, carries out coating, current collector is aluminum foil, after coating finishes, first Dry in an ordinary oven at 60°C for 6 hours, then dry in a vacuum oven at 80°C for 24 hours, and cut into circular electrode sheets with a diameter of 15mm after drying.
[0059] The circular electrode sheets obtained in Example 3 were assembled into CR2025 button cells, wherein the negative electrode used was metal lithium sheets, the diaphragm was PP film, and the electrolyte solution was 1M LiPF 6 EC / DMC (1:1, vol%).
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