High-voltage high-energy-density lithium ion battery and manufacturing method thereof
A lithium-ion battery, high-voltage technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of low cost and high specific energy, and achieve the effect of reducing cost and improving specific energy.
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[0037] The high voltage and high specific energy lithium ion battery of the present embodiment and the preparation method thereof comprise the following steps:
[0038] (1) The silicon-based composite material containing 86%-95% by weight, the conductive agent of 2.5%-7% by weight and the binder of 2.5%-7% by weight are uniformly dispersed in a solvent to make negative electrode slurry, with a size of 9 μm - The 13μm thick copper foil is used as the current collector. The negative electrode slurry is applied to the front and back of the copper foil and dried, rolled by a hot rolling machine, and cut / die-cut into strips according to the designed size to make the negative electrode sheet.
[0039] (2) the high-voltage binary composite material LiNi containing 86%-95% by weight x mn 2-x o 4 / C, 2.5%-7% conductive agent and 2.5%-7% binder are uniformly dispersed in a solvent to make positive electrode slurry, and the positive electrode slurry is coated with 15 μm-25 μm thick alu...
Embodiment 1
[0049] By mass percentage, 93% of the positive electrode active material LiNi 0.5 mn 1.5 o 4 / C material, 1.5% superconducting carbon black, 1.5% conductive graphite, 4% binder polyvinylidene fluoride, using N-methylpyrrolidone as a solvent, mixing and stirring to make it evenly mixed to make a slurry , using a 20 μm thick aluminum foil as a current collector, coating the slurry on the aluminum foil, and drying it for 8 hours at a controlled temperature of 120° C.
[0050] Roll the electrode sheet, dry it at 110°C for 12 hours in an inert atmosphere, and then die-cut it to make a positive electrode sheet. The compacted density of the electrode is 3.2g / cm 3 .
[0051] By mass percentage, mix and stir 92% negative electrode silicon / graphite composite material, 3% superconducting carbon black, 5% binder polyvinylidene fluoride, and N-methylpyrrolidone as a solvent to make it evenly mixed , make a slurry, use a 10 μm thick copper foil as a current collector, apply the slurry t...
Embodiment 2
[0056] By mass percentage, 88% of the positive electrode active material LiNi 0.5 mn 1.5 o 4 / C material, 3.0% superconducting carbon black, 3.0% conductive graphite, 6% binder polyvinylidene fluoride, using N-methylpyrrolidone as a solvent, mixing and stirring to make it evenly mixed to make a slurry , using a 20 μm thick aluminum foil as a current collector, coating the slurry on the aluminum foil, and drying it for 8 hours at a controlled temperature of 120° C.
[0057] Roll the electrode sheet, dry it at 110°C for 12 hours in an inert atmosphere, and then die-cut it to make a positive electrode sheet. The compacted density of the electrode is 2.8g / cm 3 .
[0058] By mass percentage, mix and stir 88% negative electrode silicon / graphite composite material, 5% superconducting carbon black, 7% binder polyvinylidene fluoride, and N-methylpyrrolidone as a solvent to make it evenly mixed , make a slurry, use a 10 μm thick copper foil as a current collector, apply the slurry t...
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