Modified polyvinylidene fluoride polymer, solid electrolyte and preparation method and battery
A polyvinylidene fluoride and solid-state electrolyte technology, which is applied in the field of electrolytes, can solve the problems of battery capacity fading, etc., and achieve good flame retardancy and thermal stability, good application prospects, and excellent cycle stability.
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[0056] The application also provides a preparation method of the above-mentioned solid electrolyte, comprising the following steps:
[0057] The polyvinylidene fluoride-based polymer and the lithium salt are mixed uniformly, then alkali is added for alkali treatment, phenylphosphoric acid or phenylphosphoric acid is added to the reaction system after the alkali treatment, and the reaction is carried out under the action of a catalyst, Prepare solid electrolyte;
[0058] Or, take the polyvinylidene fluoride-based polymer, add alkali for alkali treatment to obtain an intermediate, add phenylphosphoric acid or phenylphosphoric acid to the intermediate, and react under the action of a catalyst to obtain modified polyvinylidene A vinyl fluoride-based polymer, wherein the modified polyvinylidene fluoride-based polymer is mixed with a lithium salt to prepare a solid electrolyte;
[0059] The polyvinylidene fluoride-based polymer has -CH 2 -CF 2 - Segments.
[0060] Among them, co...
Embodiment 1
[0065] This embodiment provides a solid electrolyte (PVDF-LPPO-based solid electrolyte), which is prepared according to the following steps:
[0066] Step S1, first weigh 267mg LiFSI (lithium bisfluorosulfonimide) under an inert atmosphere, put it in a stirring bottle, add 15mL DMF (N,N-dimethylformamide), 400mg PVDF (polyvinylidene fluoride) ) on a small stirrer, stirring at room temperature for more than 2 hours, LiFSI and PVDF are completely dissolved to obtain a uniform transparent solution.
[0067] In step S2, 15 mg of LiOH was added to the solution obtained in step S1, and the solution was stirred at room temperature for more than 24 hours to obtain a uniform brown-black solution.
[0068] Step S3, 98.8mg phenylphosphoric acid ( PPOA) reacts with a sufficient amount of LiOH to form lithium phenylphosphonate ( LPPO), mix 106mg LPPO with an appropriate amount of AlCl 3 It was added to the solution obtained in step S2, and stirred at room temperature for more than 24 ...
Embodiment 2
[0082] This embodiment provides an assembled full battery, which is assembled according to the following steps:
[0083]Step S1, preparation of positive electrode slurry: First, weigh 100 mg of PVDF (binder) into a stirring bottle, add 1 mL of NMP (N-methylpyrrolidone), and stir on a small stirrer for 1 h until PVDF is completely dissolved. Then add 100mg Super P (conductive carbon black), 1mL NMP, stir at room temperature for 1h, add 800mg NCM811 (ternary material nickel cobalt manganese) active material, 1.5mL NMP, stir at room temperature for more than 6h.
[0084] Step S2, preparation of the positive electrode: coating the positive electrode slurry obtained in step S1 on aluminum foil, drying at 80°C for more than 6 hours, and cutting into a suitable size to obtain an NCM811 positive electrode, which is dried and stored in a vacuum oven.
[0085] In step S3, according to the soft pack battery assembly process, the NCM811 positive electrode obtained in step S2, the PVDF-LPP...
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Abstract
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