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Electrode slurry composition, pole piece and secondary battery thereof

A technology of electrode slurry and electrode sheet, which is applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of insufficient flexibility, cracking and cracking of thick electrode sheets with high surface density, and achieve good slurry stability and Effects of dispersibility, improvement of flexibility, and increase of coating thickness

Active Publication Date: 2021-11-23
SHENZHEN YANYI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of cracking caused by insufficient flexibility of high surface density thick pole pieces in the prior art, the purpose of the present invention is to provide an electrode paste composition, a pole piece sheet and its secondary battery, which can obtain a flexible electrode sheet by adding a specific auxiliary binder and a dispersing aid in the electrode slurry composition, which can solve the problem of drying or rolling a high-area density thick electrode sheet. To solve the problem of cracking in the process, the energy density of the battery can be greatly increased by using a thick coating layer, thereby improving the cycle performance of the secondary battery such as internal resistance and capacity retention after cycling

Method used

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  • Electrode slurry composition, pole piece and secondary battery thereof
  • Electrode slurry composition, pole piece and secondary battery thereof
  • Electrode slurry composition, pole piece and secondary battery thereof

Examples

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preparation example

[0065] Add 0.65mol of polypropylene glycol diol (polyether N204) into a 500mL flask equipped with a thermometer and a mechanical stirrer, stir and dehydrate at 105°C for 1h under vacuum, after cooling down to 80°C, add 0.98mol of diphenyl Methane-4,4'-diisocyanate was incubated at 80°C for 1h. Next, when the temperature of the system drops below 50°C, add 0.35 mol of 1,2,4-benzenetricarboxylic anhydride, stir rapidly for 10 minutes, control the reaction temperature not to exceed 90°C, then pour the reaction liquid into the mold, at 120°C After curing for 6 hours, the auxiliary binder A of the present invention is obtained. The weight average molecular weight of the auxiliary binder A is 250,000 through gel permeation chromatography test. See Table 1 for specific components and reaction molar ratios.

[0066]

[0067]The preparation steps are basically the same as the preparation example of auxiliary binder A, the difference lies in the reaction components and their reactio...

Embodiment 1

[0081] In parts by mass, 93.0 parts of lithium iron phosphate (Betterui, P198-S13), 2.0 parts of carbon nanotubes (Cabot, GCNTs5), 4.0 parts of polyvinylidene fluoride (Solvay, PVDF5130) and 110.0 parts Add N-methylpyrrolidone to the homogenizer, mix at 600r / min for 1min at 25°C, and then add 0.5 parts of auxiliary binder A, 0.5 parts of dispersing aid (fluorocarbon surfactant FS-300) and 1.0 parts of N-methylpyrrolidone mixed glue, mixed at 1000r / min for 10min to form electrode slurry, and then coated with a scraper at a coating speed of 30m / min, the electrode The slurry is evenly coated on the front and back surfaces of aluminum foil with a thickness of 16 μm, baked and dried at 105° C. for 1 hour, and after removing the solvent, the aluminum foil in Example 1 of the present invention has an areal density of 260 g / m on the front and back surfaces of the aluminum foil. m 2 The electrode sheet of the electrode film layer.

Embodiment 2～15

[0083] The basic preparation steps of the electrode slurry composition are the same as in Example 1, except for the components and contents of the electrode slurry composition, as shown in Table 2.

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Abstract

The invention discloses an electrode slurry composition, a pole piece and a secondary battery thereof. The electrode slurry composition comprises an active material, a conductive substance, a main binder, an auxiliary binder and a dispersing aid. The auxiliary binder is at least prepared from diisocyanate, dihydric alcohol and cyclic anhydride through a polymerization reaction. The ratio of the molar weight of the diisocyanate to (the sum of the molar weight of the dihydric alcohol and the molar weight of the cyclic anhydride) is (0.95-1.0): 1.0; when the sum of the molar weights of the dihydric alcohol and the cyclic anhydride is 100 mol%, the molar percentage of the dihydric alcohol is 51-80 mol%, and the molar percentage of the cyclic anhydride is 20-49 mol%. The electrode slurry composition contains specific components in a proper content range, the synergistic effect of the components is exerted, the slurry stability and dispersity are better, the flexibility of a pole piece can be effectively improved, the problem of brittle cracking can be solved, and the thickness of a pole piece coating is greatly increased; furthermore, the energy density of the battery is greatly improved, and meanwhile, the impedance, the capacity retention ratio after circulation and the like of the secondary battery are improved.

Description

technical field [0001] The invention relates to the field of secondary battery materials, in particular to an electrode slurry composition, a pole piece and a secondary battery thereof. Background technique [0002] Lithium-ion secondary batteries, as a clean energy source, are widely used in products such as various electronic devices and electric vehicles. With the continuous development of the consumer market, people put forward higher requirements on the energy density of lithium-ion batteries. By reducing the proportion of inactive materials (such as separators and current collectors, etc.), the preparation of high surface density electrode pole pieces can greatly increase the mass proportion of active materials, and can effectively increase the energy density of lithium-ion batteries. [0003] However, after increasing the areal density of the pole piece, the brittleness of the pole piece increases rapidly, which makes it difficult to meet the needs of the pole piece ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/622H01M10/0525H01M2004/021Y02E60/10
Inventor 岳敏周竹欣覃兰媚向有园邢梦媛钱超
Owner SHENZHEN YANYI NEW MATERIALS CO LTD
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