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Positive pole piece, manufacturing method thereof and secondary battery

A technology for positive pole pieces and manufacturing methods, which is applied to battery electrodes, electrode manufacturing, electrode collector coatings, etc., can solve problems affecting the performance of positive pole pieces, and achieve improved performance, reduced corrosion, and reduced contact area Effect

Pending Publication Date: 2020-11-10
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a positive pole piece and its manufacturing method, and a secondary battery, aiming to solve the problem that the surface layer of the lithium supplement material will form inactive by-products with air and moisture, which will affect the performance of the positive pole piece

Method used

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  • Positive pole piece, manufacturing method thereof and secondary battery
  • Positive pole piece, manufacturing method thereof and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] 1wt% Li 2 NiO 2 , and 97.5wt% nickel cobalt lithium manganese oxide LiNi 0.8 mn 0.1 co 0.1 o 2 The particles, 0.5wt% of sp, and 1wt% of pvdf are added to the solvent and stirred to obtain a mixed slurry, forming a uniform and stable first slurry. 97wt% nickel cobalt lithium manganese oxide LiMn 0.8 Ni 0.1 co 0.1 o 2 The particles, 2wt% of sp, and 1wt% of pvdf are added to the solvent and stirred to obtain a mixed slurry, forming a uniform and stable second slurry. The first slurry and the second slurry are coated on the surface of the aluminum foil in layers at the same time, so that the first slurry is coated on the bottom layer directly in contact with the current collector, and the second slurry is on the surface layer away from the current collector. The coating width of the first slurry and the second slurry is 60 mm, and the coating thickness ratio is 30%:70%. Afterwards, the pole pieces were dried and rolled, the drying temperature was 110°C, the rollin...

Embodiment 2

[0092] 30wt% Li 2 NiO 2 , and 66.2wt% nickel-cobalt lithium manganese oxide LiNi 0.8 mn 0.1 co 0.1 o 2 The particles, 2wt% of sp, and 1.8wt% of pvdf were added to the solvent and stirred to obtain a mixed slurry, forming a uniform and stable first slurry. 97wt% nickel cobalt lithium manganese oxide LiMn 0.8 Ni 0.1 co 0.1 o 2 The particles, 2wt% of sp, and 1wt% of pvdf are added to the solvent and stirred to obtain a mixed slurry, forming a uniform and stable second slurry. The first slurry and the second slurry are coated on the surface of the aluminum foil in layers at the same time, so that the first slurry is coated on the bottom layer directly in contact with the current collector, and the second slurry is on the surface layer away from the current collector. The coating width of the first slurry and the second slurry is 60 mm, and the coating thickness ratio is 30%:70%. Afterwards, the pole pieces were dried and rolled, the drying temperature was 110°C, the roll...

Embodiment 3

[0094] 50wt% Li 2 NiO 2 , and 76.2wt% nickel-cobalt lithium manganese oxide LiNi 0.8 mn 0.1 co 0.1 o 2 The particles, 2wt% of sp, and 1.8wt% of pvdf were added to the solvent and stirred to obtain a mixed slurry, forming a uniform and stable first slurry. 97wt% nickel cobalt lithium manganese oxide LiMn 0.8 Ni 0.1 co 0.1 o 2 The particles, 2wt% of sp, and 1wt% of pvdf are added to the solvent and stirred to obtain a mixed slurry, forming a uniform and stable second slurry. The first slurry and the second slurry are coated on the surface of the aluminum foil in layers at the same time, so that the first slurry is coated on the bottom layer directly in contact with the current collector, and the second slurry is on the surface layer away from the current collector. The coating width of the first slurry and the second slurry is 60mm, and the coating thickness ratio of the first slurry and the second slurry is 30%:70%, and then the pole piece is dried, rolled, and dried. ...

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Abstract

The invention provides a positive pole piece, a manufacturing method thereof and a secondary battery. The positive pole piece comprises a current collector, a first material layer coated on the current collector, and a second material layer coated on the first material layer; the first material layer comprises a lithium supplementing material, a first positive electrode active material, a first conductive agent and a first adhesive; the second material layer includes a second positive electrode active material, a second conductive agent, and a second binder. The invention has the beneficial effects that the first material layer and the second material layer are sequentially coated on the current collector, so the second material layer can coat the first material layer, air is isolated fromthe first positive electrode active material, and the contact area of the air and the lithium supplementing material in the first material layer in the processing and manufacturing process is reduced; the corrosion degree of the lithium supplementing material by air is reduced, and the first material layer can supplement metal elements for the second material layer, so the performance of the secondary battery prepared from the positive pole piece is improved.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a positive pole piece, a manufacturing method thereof, and a secondary battery. Background technique [0002] With the advancement of technology, secondary batteries are widely used in electric vehicles, energy storage base stations, 3C products, etc. With the demand for energy density improvement of various types of products, the design and manufacture of high energy density electrodes has also become a research hotspot. In order to continuously improve the energy density of devices, in secondary batteries using Si-based anodes, improving the first Coulombic efficiency (hereinafter referred to as the first efficiency) and cycle of the battery cell through material complementation has been extensively studied. At present, the lithium-supplementing material is mixed with the active positive electrode material to make a pole piece, but in this production method, the surface layer of the l...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/04
CPCH01M4/667H01M4/0404H01M4/043H01M4/0471Y02E60/10
Inventor 李柳程芳燕张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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