Three-dimensional composite current collector and preparation method thereof
A three-dimensional composite and current collector technology, applied in the field of three-dimensional current collectors and their preparation, can solve the problems such as the lack of improvement in the bonding performance of composite materials and metal lithium, unfavorable battery tab welding and large-scale production, and metal lithium falling off easily. It is beneficial to buffer the electrode polarization reaction, improve the electrochemical performance, and reduce the actual current density.
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[0040] The invention provides a preparation method of a three-dimensional composite current collector, comprising the following steps:
[0041] S1. Weigh a predetermined amount of carbon material, lithiophilic metal oxide and lithium salt, mix and stir for 0.5 to 4 hours; add solvent and stir for 0.5 to 2 hours until completely dissolved; then add a predetermined amount of binder and stir for 4 to 10 hours to prepare Obtaining lithium battery negative electrode lithiophilic material slurry;
[0042] S2. Select a copper foil with a thickness of 6-20 μm as the base layer, apply the slurry on the copper foil at a coating speed of 10-30 m / min, and then dry it in a blast drying oven at 70-80 °C for 4- 8h, and then drying in a vacuum oven at 110-130°C for 8-12h to prepare a three-dimensional composite current collector.
[0043] Further, the solvent is one of water and N-methylpyrrolidone.
[0044] Further, in step S1, the mass ratio of the carbon material, the lithiophilic metal ...
Example Embodiment
[0050] Example 1
[0051] Preparation method of three-dimensional composite current collector:
[0052] S1. Weigh 30g of carbon nanotubes and 55g of copper oxide particles and place them in a stirring tank and stir for 2 hours; then add 10g of lithium carbonate into the stirring tank and stir for 2 hours, then add an appropriate amount of N-methylpyrrolidone, and stir for 2 hours until completely dissolved; then 5g of polyvinylidene fluoride was added into the stirring tank and stirred for 10 hours to prepare the lithium battery negative electrode lithiophilic material slurry;
[0053] S2. Select a copper foil with a thickness of 8 μm without impurities on the surface as the base layer, apply the slurry on the copper foil, apply a coating machine at a coating speed of 10 m / min, and then place it in a blast to dry The three-dimensional composite current collector was prepared by baking at 75 °C for 4 h in an oven, and finally at 120 °C in a vacuum oven for 12 h.
[0054] see ...
Example Embodiment
[0075] Example 2
[0076] Preparation method of three-dimensional composite current collector:
[0077] S1. Weigh 30g of carbon nanotubes and 55g of zinc oxide particles and place them in a stirring tank and stir for 2 hours; then add 10g of lithium carbonate into the stirring tank and stir for 2 hours, then add an appropriate amount of N-methylpyrrolidone, and stir for 2 hours until completely dissolved; then Add 5 g of polyacrylonitrile LA133 into a stirring tank and stir for 10 hours to prepare a lithium battery negative electrode lithiophilic material slurry;
[0078] S2. Select a copper foil with a thickness of 8 μm without impurities on the surface as the base layer, apply the slurry on the copper foil, apply a coating machine at a coating speed of 10 m / min, and then place it in a blast to dry The three-dimensional composite current collector was prepared by baking at 75 °C for 4 h in an oven, and finally at 120 °C in a vacuum oven for 12 h.
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