A kind of polyimide modified nano-silicon negative electrode material and its preparation method and application
A polyimide, negative electrode material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of lithium consumption, unstabilized membrane, loss of effective contact of silicon particles, etc. Simple process and low cost effect
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[0035] The invention provides a preparation method of a polyimide modified nano-silicon negative electrode material, comprising the following steps:
[0036] (1) diamine, dianhydride and solvent are carried out polymerization reaction to obtain polyamic acid solution;
[0037] (2) mixing and drying the polyamic acid solution and silicon nanoparticle to obtain intermediate powder;
[0038] (3) In an inert atmosphere, the intermediate powder is subjected to imine reaction to obtain the polyimide modified nano-silicon negative electrode material.
[0039] In the present invention, the molecular structures of the diamine and dianhydride in the step (1) are preferably linear, cyclic or aromatic, more preferably cyclic or aromatic.
[0040] In the present invention, the diamine in the step (1) is preferably diaminodiphenyl ether, bis(trifluoromethyl)diaminobiphenyl, p-phenylenediamine or triphenylenediamine, more preferably diamine (trifluoromethyl)diaminobiphenyl, p-phenylenediam...
Embodiment 1
[0072] This example provides a polyimide-modified nano-silicon anode material, specifically a pyromellitic anhydride / diaminodiphenyl ether type polyimide-modified nano-silicon anode material, and the preparation method includes the following steps:
[0073] Dissolve 0.5 g of diaminodiphenyl ether in 10 g of N-methylpyrrolidone (NMP), control the stirring speed to be 600 rpm and stir for 1 h to obtain a diaminodiphenyl ether solution.
[0074] An equimolar amount of pyromellitic anhydride was added to the diaminodiphenyl ether solution, and the stirring speed was controlled to be 500 rpm and stirred for 6 h to obtain a polyamic acid solution with a concentration of 3%.
[0075] Take 1.6667g of polyamic acid solution, add 1g of silicon nanoparticles, and stir at 80°C at 400 rpm for 2 hours. The obtained mixture is uniformly coated on the glass surface, and dried at 25°C under a vacuum of 0.05Pa. The solvent is completely volatilized Powder later.
[0076] After the obtained pow...
Embodiment 2
[0080] This example provides a polyimide-modified nano-silicon anode material, specifically a pyromellitic anhydride / bis(trifluoromethyl)diaminobiphenyl type polyimide polymer-modified nano-silicon anode material, and a preparation method thereof Include the following steps:
[0081] Dissolve 1 g of bis(trifluoromethyl)diaminobiphenyl in 20 g of N-methylpyrrolidone (NMP), and control the stirring speed to be 700 rpm and stir for 1.5 h to obtain a bis(trifluoromethyl)diaminobiphenyl solution.
[0082] An equimolar amount of pyromellitic anhydride was added to the bis(trifluoromethyl)diaminobiphenyl solution, and the stirring speed was controlled to be 500 rpm and stirred for 5 h to obtain a polyamic acid solution.
[0083] Take 2g of polyamic acid solution, add 1g of silicon nanoparticles, and stir at 85°C at 350 rpm for 2 hours. The obtained mixture is uniformly coated on the glass surface and dried at 30°C under a vacuum of 0.1Pa. After the solvent is completely volatilized ...
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