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Pole piece, preparation method thereof and battery
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A pole piece and battery technology, which is applied to the preparation method thereof and the field of batteries and pole pieces, can solve the problems of uneven infiltration of electrolyte, uneven battery interface, and easy lithium precipitation.
Pending Publication Date: 2022-05-13
BTR NEW MATERIAL GRP CO LTD
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The grooves in this solution are obtained by rolling, and the surface of the pole piece is uneven, resulting in different compaction densities. After assembling into a full battery, the battery interface is not smooth, and the internal pores of the pole pieces are uneven, which leads to easy lithium precipitation after charging and discharging.
[0007] Therefore, how to solve the problems of low lithium ion transmission rate and uneven electrolyte infiltration caused by thick electrodes is a technical difficulty that needs to be solved urgently in this field.
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[0058] The preparation method of above-mentioned pole piece, comprises the steps:
[0059] mixing solid particles, binders, water and organic solvents, the solid particles including active materials and conductive agents, stirring to obtain a slurry, in the slurry: the organic solvent forms a liquid bridge between the solid particles in the slurry, The three-phase contact angle θ Figure 4 Shown angle θ);
[0060] Coating the slurry on the surface of the current collector, the coating thickness of the slurry on at least one side of the current collector is greater than or equal to 100 μm, and drying to obtain a pole piece.
[0061] In some embodiments, θ can be 2°, 5°, 10°, 15°, 20°, 23°, 26°, 30°, 35°, 40°, 45°, 50°, 55°, 60° , 65°, 70°, 80°, 85° or 88°, etc., more preferably 5°<θ<85°.
[0091]Add the above-mentioned graphite, Super-P and CMC into water and mix and stir evenly, then add n-dodecane to obtain the first slurry, wherein the volume content of n-dodecane in the first slurry is 2%, n-dodecane The mass percentage of alkane and water is 2.4%;
[0092] Mix the above-mentioned first slurry with SBR, and stir at a rate of 400 rpm for 25 minutes to obtain a second slurry;
[0093] The second slurry is coated on both sides of a 9 μm thick metalcopper foil, and the coating thickness on one side is 150 μm, and dried to obtain a negative electrode sheet, which is then rolled by cold pressing to reach the compacted density of the negative electrode sheet 1.65g / cc.
[0094] Figure 5 It is the test ...
Embodiment 2
[0096] The difference from Example 1 is that the volume content of n-dodecane in the first slurry is 0.8%.
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Abstract
The invention relates to a pole piece, a preparation method thereof and a battery. The pole piece comprises a current collector and an active material layer arranged on the surface of the current collector, the thickness of the active material layer is larger than or equal to 100 microns, the active material layer comprises solid particles, capillary pores are formed among the solid particles, and the solid particles comprise active substances and conductive agents. According to the invention, on the basis of the capillary action principle, capillary pores are distributed inside and on the surface of the active material layer by adjusting the microstructure between the active material particles in the pole piece, so that the transmission dynamics of the lithiumionelectrode is effectively improved. On the basis of the same pole piece thickness, the porosity of the pole piece is improved by 10% or above compared with that of a conventional electrode, and the liquid absorption time is shortened by 10% or above compared with that of the conventional electrode.
Description
technical field [0001] The application belongs to the field of battery technology, and in particular relates to a pole piece, a preparation method thereof and a battery. Background technique [0002] With the continuous development of science and technology, the application field of lithium-ion batteries has expanded from portable electronic products to electric vehicles, energy storage power supplies, aviation fields, etc. Especially for large electric equipment such as electric vehicles, under the premise of ensuring safety, they need to have a certain mileage and a cycle life matching that of electric vehicles. Therefore, higher requirements are put forward for the energy density, cycle life and rate performance of lithium-ion batteries. Require. [0003] At present, there are many ways to increase the energy density, such as increasing the thickness of the positive and negative electrode sheets, increasing the compaction density of the active material for tight assembly...
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