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A battery cell and negative electrode technology, which is applied in the field of battery cell preparation, can solve the problems of unstable battery energy density and risks in the processing process, and achieve the effects of preventing the risk of lithium precipitation, improving the pass-through rate and reducing the excess ratio.
Inactive Publication Date: 2020-07-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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[0006] The preparation method of a battery cell proposed by the present invention can solve the technical problems of unstable energy density of the battery and risks in the processing process caused by the existing preparation method
Method used
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preparation example Construction
[0030] Such as figure 1 As shown, the manufacturing method of the battery cell in this embodiment includes the following steps:
[0031] S100. Use metal foil as the negative electrode or positive electrode current collector, and coat a layer of negative or positive electrode material uniformly on the current collector;
[0032] S200: Disperse or dissolve the binder in a corresponding solvent, and configure it into a binder suspension or solution with a set solid content;
[0033] S300. Coat a layer of adhesive in S200 evenly on the edge of the pole piece prepared by S100 where the metal foil is exposed, and dry it in an oven;
[0034] S400. Finally, the negative or positive pole piece is processed and assembled with the corresponding positive or negative electrode, separator, and electrolyte to form a lithium ion battery cell.
[0035] among them,
[0036] The thickness of the metal foil in the S100 is 5um-20um.
[0037] The binder in the S200 includes polyvinylidene fluoride (PVDF), sodi...
Embodiment 1
[0047] Use 5um metal copper foil as the negative electrode current collector, and evenly coat a layer of graphite negative electrode slurry, and dry it in a coating oven; dissolve the aqueous PAA in water to make a solution with a solid content of 40%, uniform Coated on the edge exposed metal foil, dried in an oven, and finally processed by rolling and slitting; the corresponding lithium iron phosphate positive electrode is assembled into a battery with an N / P ratio of 1.0 and an Overhang of 0 mm.
Embodiment 2
[0049] Use 8um metal aluminum foil as the negative electrode current collector, and evenly coat a layer of nickel cobalt lithium manganate (NCM622) positive electrode slurry, and dry it in a coating oven; dissolve the oily PVDF in NMP to make a solid content of The 7% solution is evenly coated on the edge of the exposed metal foil, dried in an oven, and finally processed by rolling and slitting; the corresponding silicon oxide negative electrode has an N / P ratio of 1.08 and an Overhang of 1mm. Assemble into a battery.
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Abstract
The invention provides a preparation method of a battery cell, and can solve the technical problems that the energy density of the battery is unstable and risks exist in the processing process due toan existing preparation method. The method comprises the following steps: using a metal foil as a negative electrode or positive electrode current collector, and uniformly coating a layer of negativeelectrode or positive electrode material on the current collector; dispersing or dissolving a binder in a corresponding solvent to prepare a binder suspension or solution with a set solid content; uniformly coating a layer of adhesive at the position, wherein the metal foil is exposed, of the edge of the prepared pole piece, and drying in a drying oven; and finally, assembling the negative electrode or the positive electrode pole piece with a corresponding positive electrode or negative electrode, a diaphragm and an electrolyte to form a lithium ion battery cell after being treated. Through introduction of the binder, the surface of the foil is covered, the risk of lithium precipitation at the edge of the negative electrode is effectively prevented, and the safety performance of the battery cell is improved; while the safety performance is improved, the excess ratio of the negative electrode can be reduced, the usage amount of the negative electrode is reduced, the energy density of the battery cell is improved, and the production efficiency is improved.
Description
Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a battery core. Background technique [0002] Lithium-ion batteries are currently the battery system with the highest energy density among commercial secondary batteries. Commercial lithium-ion batteries have good cycleability and safety in use. They have been widely used in communications, transportation, electronic equipment, industrial products and other fields , And quickly gain a larger market. [0003] In battery capacity design, an important criterion is that the negative electrode must have a larger reversible capacity than the positive electrode. Although the negative electrode capacity is smaller, the battery may have some advantages, such as large battery capacity, but during the charging process, lithium deposits on the surface of the negative electrode may cause safety problems. In addition, the capacity attenuation of the negative ele...
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Application Information
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