Flexible package lithium ion battery silicon negative pole and manufacturing method thereof
A lithium-ion battery, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of short battery cycle life, and achieve the effect of improving cycle stability and initial charge-discharge efficiency.
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[0033] Example 1
[0034] A manufacturing method of a silicon negative electrode of a soft-pack lithium ion battery, the manufacturing method comprising the following steps:
[0035] a) Compounding: take the binder polyimide powder, add it to the organic solvent of nitrogen methyl pyrrolidone, prepare the glue with a solid content of 25%, and stir at a slow speed of 1000 rpm for 30 minutes;
[0036] b) Add conductive agent: add conductive agent super-p to the glue solution obtained in step a), and stir rapidly at 4000rpm for 1.5h to obtain conductive solution;
[0037] c) Add main material: Add silicon negative electrode material to the conductive liquid obtained in step b), stir at 800 rpm for 8 min, then quickly stir at 3000 rpm for 45 min, then add artificial graphite, after 8 min of slow stirring at 800 rpm, add NMP to adjust the solid content is 46%, rapidly stirred at 4000rpm for 1.5h, and then slowly stirred at 900rpm for 20min to obtain a slurry, wherein the mass r...
Example Embodiment
[0043] Example 2
[0044] A manufacturing method of a silicon negative electrode of a soft-pack lithium ion battery, the manufacturing method comprising the following steps:
[0045] a) Compounding: take the binder polyimide powder and add it to the organic solvent composed of nitrogen methyl pyrrolidone and dimethylacetamide, and the volume ratio of nitrogen methyl pyrrolidone and dimethylacetamide is 1: 2. The solid content of the glue is adjusted to 5%, and the mixture is stirred at a slow speed of 800rpm for 40min;
[0046] b) Add conductive agent: add conductive agent super-p to the glue solution obtained in step a), stir rapidly at 3000 rpm for 2 hours, and obtain conductive liquid;
[0047] c) Add main material: Add silicon anode material to the conductive liquid obtained in step b), stir at a slow speed of 800rpm, after 10min, stir quickly at 3000rpm for 60min, then add hard carbon, stir at a slow speed of 800rpm for 10min, add NMP to adjust the solid state The c...
Example Embodiment
[0053] Example 3
[0054] A manufacturing method of a silicon negative electrode of a soft-pack lithium ion battery, the manufacturing method comprising the following steps:
[0055] a) Compounding: take the binder polyimide powder and add it to an organic solvent composed of dimethylacetamide, nitrogen methyl pyrrolidone and dimethyl formamide, dimethyl acetamide, nitrogen methyl pyrrolidone The volume ratio to dimethylformamide is 1:2:1, the solid content of the glue is 15%, and the mixture is slowly stirred at 1000rpm for 50min;
[0056] b) Add conductive agent: add conductive agent super-p to the glue solution obtained in step a), and stir rapidly at 4000rpm for 2.5h to obtain conductive solution;
[0057] c) Add main material: Add silicon negative electrode material to the conductive liquid obtained in step b), stir at 800 rpm for 12 min, then quickly stir at 3000 rpm for 75 min, then add natural graphite, after 12 min of slow stirring at 800 rpm, add NMP to adjust t...
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