Positive electrode plate and preparing method thereof and lithium ion battery

A lithium-ion battery and positive pole piece technology, which is applied to battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of battery cycle performance and poor high-temperature storage performance, and achieve high-temperature storage performance and cycle performance. , Reduce oxidative decomposition, reduce the effect of migration

Inactive Publication Date: 2015-12-02
SHENZHEN 3SUN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a positive electrode sheet for the problems of poor battery cycle performance and high temperature storage performance of the positive electrode sheet in the prior art under the condition of high charging voltage

Method used

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  • Positive electrode plate and preparing method thereof and lithium ion battery

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preparation example Construction

[0030] At the same time, the present invention also provides a method for preparing the above-mentioned positive electrode sheet, which specifically includes the following steps:

[0031] S1. Obtain a positive electrode sheet precursor; the positive electrode sheet precursor includes a positive electrode current collector and a positive electrode material layer attached to the surface of the positive electrode current collector;

[0032] S2, obtaining a dopamine solution;

[0033] S3. The dopamine solution is placed on the surface of the positive electrode material layer on the positive electrode sheet precursor, and then dried to form a polydopamine layer to obtain a positive electrode sheet.

[0034]According to the present invention, firstly, a positive electrode sheet precursor is prepared. In the present invention, the positive electrode sheet precursor mentioned above can be the positive electrode sheet in the prior art. Its preparation method is well known in the art,...

Embodiment 1

[0057] This embodiment is used to illustrate the positive pole piece disclosed in the present invention, its preparation method, and lithium ion battery.

[0058] The binder PVDF was dissolved in the solvent NMP (N-methylpyrrolidone), and the positive electrode material lithium cobaltate LiCoO 2 Add the conductive agent CNT carbon nanotubes into the solvent, fully stir and mix to obtain the positive electrode slurry, and its composition weight ratio is LiCoO 2 :CNT:PVDF=98:1:1.

[0059] The above positive electrode slurry was uniformly coated on a 12 μm aluminum foil, baked and dried at 110° C., and rolled to obtain a positive electrode sheet precursor. Wherein, the thickness of the positive electrode material layer on the surface of the aluminum foil is 100 μm.

[0060] Dopamine was dissolved in tris-HCl buffer solution to prepare a solution with a dopamine concentration of 2 g / L, and ammonia water was added to adjust the pH value to 8.5 to obtain a dopamine solution.

[0...

Embodiment 2

[0066] This embodiment is used to illustrate the positive pole piece disclosed in the present invention, its preparation method, and lithium ion battery.

[0067] The positive electrode sheet and the lithium ion battery were prepared according to the method of Example 1, the difference being that the concentration of dopamine in the dopamine solution was 20 g / L.

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Abstract

The invention relates to a positive electrode plate and a preparing method thereof and a lithium ion battery. The positive electrode plate aims at solving the problems that for a positive electrode plate in the prior art, under the situation of high charging voltage, the battery circulation performance and the high-temperature storage performance are poor. The positive electrode plate comprises a positive electrode current collector and a positive electrode material layer attached to the surface of the positive electrode current collector. A poly-dopamine layer is further attached to the surface of the positive electrode material layer. Meanwhile, the invention discloses the preparing method of the positive electrode plate and the lithium ion battery with the positive electrode plate. The battery circulation performance and the high-temperature storage performance of the lithium ion battery prepared from the positive electrode plate are excellent under the situation of high changing voltage.

Description

technical field [0001] The invention relates to a positive pole piece, a preparation method thereof, and a lithium ion battery comprising the positive pole piece. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high specific energy, high cycle life, and low self-discharge, and are widely used in consumer electronic products such as mobile phones, tablet computers, and mobile power supplies. In recent years, with the rapid development of smart phones and the continuous increase of their functions, the energy density of lithium-ion batteries, which are the source of their power, has gradually increased and their overall performance has been continuously improved in line with the development needs of smart phones. [0003] Generally, as a positive electrode active material for a lithium ion secondary battery, a material capable of reversibly releasing and intercalating lithium ions is generally selected, such as the general formula LiCo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 玉正日梁世硕周文对
Owner SHENZHEN 3SUN ELECTRONICS
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