Cathode and lithium ion secondary battery containing same
A negative electrode and negative electrode material technology, applied in the field of lithium-ion secondary batteries, can solve the problems of low specific capacity of lithium titanium oxide and low capacity of lithium-ion secondary batteries
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[0026] The preparation method of the positive electrode can adopt various methods commonly used in the art, such as preparing the positive electrode active material, binder and conductive agent into a positive electrode material slurry with a solvent, and the addition amount of the solvent is well known to those skilled in the art. The viscosity and operability requirements of the slurry coating of the prepared positive electrode slurry can be flexibly adjusted. Then, the prepared positive electrode material slurry is drawn and coated on the positive electrode current collector, dried and pressed into sheets, and then cut into pieces to obtain positive electrodes. The drying temperature may be 100-150° C., and the drying time may be 2-10 hours.
[0027] The solvent used in the positive electrode slurry can be various solvents in the prior art, such as N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), diethylformamide (DEF), One or more of methyl sulf...
Embodiment 1
[0033] This embodiment is used to illustrate the negative electrode and the secondary lithium ion battery provided by the present invention.
[0034] The production of the positive electrode sheet: the LiCoO 2 , carbon black and PVDF are dissolved in N-methylpyrrolidone at a weight ratio of 100:8:5, stirred evenly and coated on aluminum foil, dried at 90°C, rolled, rolled and cut into positive plates, coated The thickness is 0.133-0.137mm, the pole piece size is 480cm×42.5cm, LiCoO 2 The content is 6.35 grams.
[0035] The production of the negative electrode sheet: dissolving graphite, conductive carbon black and SBR in deionized water at a weight ratio of 100:4:8, stirring evenly, coating on copper foil, drying at 90°C, and rolling to obtain For a pole piece, the thickness of the first coating is 0.105-0.109 mm; the Li 4 Ti 5 o 12 , conductive carbon black and SBR are dissolved in deionized water with a weight ratio of 100:4:8, stirred evenly, coated on the primary pole...
Embodiment 2
[0038] This embodiment is used to illustrate the negative electrode and the secondary lithium ion battery provided by the present invention.
[0039] Carry out according to the method of embodiment 1, difference is the making of negative pole piece.
[0040] Production of the negative electrode sheet: Dissolve carbon black and PVDF in deionized water at a weight ratio of 100:10, stir evenly, apply on copper foil, dry at 90°C, and roll to obtain a primary sheet. The thickness of the primary coating is 0.075-0.079 mm; the Li 3.95 Al 0.15 Ti 0.49 o 12 , carbon nanotubes and PVDF are dissolved in deionized water at a weight ratio of 100:2:10, stirred evenly, coated on the primary pole piece, dried at 90°C, and rolled to obtain a secondary pole piece, wherein the second The thickness of the sub-coating is 0.035-0.039 mm; it is cut into negative plates, the size of which is 493 mm × 44 mm, Li 3.95 Al 0.15 Ti 0.49 o 12 The content of carbon black is 1.25 grams, and the conten...
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Abstract
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