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Positive electrode sheet, preparation method thereof, and secondary battery

A positive electrode sheet and positive electrode film technology, which is applied in the field of secondary batteries, positive electrode sheets and their preparation, can solve the problems of unfavorable scale industrial and chemical production, high cost of lithium metaaluminate materials, and complicated operation, so as to improve safety performance and Cyclic performance, ease of mass production, and simple operation

Active Publication Date: 2020-07-28
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its operation is complicated, and the cost of lithium metaaluminate material is high, which is not conducive to large-scale industrial chemical production

Method used

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  • Positive electrode sheet, preparation method thereof, and secondary battery
  • Positive electrode sheet, preparation method thereof, and secondary battery
  • Positive electrode sheet, preparation method thereof, and secondary battery

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preparation example Construction

[0033] The method for preparing the positive electrode sheet according to the second aspect of the present invention is used to prepare the positive electrode sheet described in the first aspect of the present invention, comprising the steps of: (1) mixing the positive electrode active material, the conductive agent, and the binder to prepare the positive electrode slurry , and then coat the positive electrode slurry on the positive electrode current collector, and form a positive electrode diaphragm after drying; (2) coat the nano-inorganic sol on the positive electrode diaphragm, form a porous nano-inorganic film after drying, and complete the preparation of the positive electrode sheet .

[0034] The preparation method of the positive electrode sheet according to the second aspect of the present invention is simple in operation, low in cost, and easy to be implemented in industry and mass-produced.

[0035] In the preparation method of the positive electrode sheet according...

Embodiment 1

[0044] (1) Preparation of positive electrode sheet

[0045] Dissolve the positive electrode active material nickel cobalt lithium manganese oxide, binder PVDF, and conductive agent conductive carbon in the solvent NMP according to the mass ratio of 97:1:2 to make positive electrode slurry, and then coat the front and back sides of the positive electrode current collector aluminum foil After drying and rolling, it forms a positive electrode membrane, and then scrapes the surface of the positive electrode membrane with a nano-alumina sol (pH 8) with a solid content of 20% and an average particle size of 10 nm, and then at 60 ° C. and drying under a lower temperature to obtain a positive electrode sheet coated with a nano-alumina film with a thickness of 8 μm.

[0046] (2) Preparation of negative electrode sheet

[0047] Negative active material artificial graphite, conductive agent conductive carbon, binder styrene-butadiene rubber emulsion (SBR), thickener sodium carboxymethyl...

Embodiment 2

[0053] Lithium-ion secondary batteries were prepared according to the method of Example 1, the difference being:

[0054] (1) Preparation of positive electrode sheet

[0055] Dissolve the positive electrode active material nickel cobalt lithium manganese oxide, binder PVDF, and conductive carbon in the solvent NMP according to the mass ratio of 95:3:2 to make positive electrode slurry, and then coat the front and back sides of the positive electrode current collector aluminum foil After drying and rolling, it forms a positive electrode membrane, and then sprays the surface of the positive electrode membrane with a nano-aluminum hydroxide sol (pH is 5) with a solid content of 10% and an average particle size of 20 nm, and then heats it at 50 ° C. and drying under a lower temperature to obtain a positive electrode sheet coated with a nano-aluminum hydroxide film with a thickness of 3 μm.

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Abstract

The invention provides a positive electrode plate and a preparation method therefor and a secondary battery. The positive electrode plate comprises a positive electrode current collector and a positive electrode membrane; the positive electrode membrane is arranged on the positive electrode current collector and comprises a positive electrode active material, a conductive agent and a binder; and the positive electrode plate also comprises a porous nanometer inorganic matter thin film which is arranged on one side, far from the positive electrode current collector, of the positive electrode membrane, and consists of nanometer inorganic matter particles. By virtue of the positive electrode plate, the safety performance and cycle performance of the secondary battery can be improved effectively; and the preparation method of the positive electrode plate is simple in operation, low in cost, easily available in raw materials, and environment friendly, so that industrial implementation and batch production can be realized easily.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode sheet, a preparation method thereof, and a secondary battery. Background technique [0002] Since the 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions, lithium ion secondary batteries have gradually been used as commercial energy storage components and are widely used in communications, lighting, portable electronic products, energy storage, power tools and other fields. With the expansion of lithium-ion secondary batteries in energy storage, electric vehicles and other fields, the energy density requirements of lithium-ion secondary batteries are getting higher and higher. However, as the energy density of lithium-ion secondary batteries continues to increase, the thermal stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/42
CPCH01M4/13H01M4/139H01M10/0525H01M10/4235Y02E60/10
Inventor 李强刘阳宋晋阳艾邓均闫传苗钟开富
Owner CONTEMPORARY AMPEREX TECH CO
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