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Lithium-supplementing positive electrode slurry and preparation method and application thereof

A technology of positive electrode slurry and positive active material, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of increasing the contact time of LNO powder with air and the inability to ensure the uniform dispersion of LNO particles, so as to reduce the impact, Improve the effect of the processing window

Pending Publication Date: 2021-12-24
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] On the one hand, the above scheme increases the contact time of LNO powder with air, and on the other hand, it cannot guarantee that LNO particles can be uniformly dispersed in the slurry system within the same homogenization time. Lithium-supplementing positive electrode slurry is very necessary

Method used

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  • Lithium-supplementing positive electrode slurry and preparation method and application thereof
  • Lithium-supplementing positive electrode slurry and preparation method and application thereof
  • Lithium-supplementing positive electrode slurry and preparation method and application thereof

Examples

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Embodiment 1

[0041] This embodiment provides a lithium-supplementing cathode slurry, and the preparation method of the lithium-supplementing cathode slurry is as follows:

[0042](1) Mix N-methylpyrrolidone and polyvinylidene fluoride, add carbon nanotubes and conductive carbon black SP in turn for vacuum stirring, the dispersion speed is 2000rpm, and the dispersion time is 180min to obtain a half-step conductive glue;

[0043] (2) the half-step conductive adhesive solution that step (1) obtains and Li 2 NiO 2 After the lithium replenishing agent is mixed, it is stirred at 30 rpm, the dispersion speed of mixing is 2000 rpm, and the dispersion time is 90 minutes to obtain a conductive glue. The mass fraction of LNO in the conductive glue is 10%, the mass fraction of carbon nanotubes is 1%, and the SP The mass fraction of the product is 2%;

[0044] (3) Add conductive glue to the NCM powder for the first time, control the overall solid content of the slurry to 93%, stir and disperse for 60...

Embodiment 2

[0048] The only difference between this embodiment and embodiment 1 is that the mixing and dispersing speed of the conductive glue solution in step (2) is 500 rpm, and other conditions and parameters are exactly the same as those in embodiment 1.

[0049] The dispersion diagram of the lithium-supplementing positive electrode slurry is as follows: image 3 shown by image 3 It can be seen that slight agglomeration of the positive electrode slurry prepared in this embodiment occurs.

Embodiment 3

[0051] The only difference between this embodiment and embodiment 1 is that the mixing and dispersing speed of the conductive glue solution in step (2) is 3500 rpm, and other conditions and parameters are exactly the same as those in embodiment 1.

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Abstract

The invention provides a lithium-supplementing positive electrode slurry and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a solvent and a binder, adding a conductive agent, carrying out primary vacuum stirring, mixing with a lithium-supplementing agent, and carrying out secondary vacuum stirring to obtain a conductive adhesive solution; and (2) mixing the conductive adhesive solution with the positive electrode active material in three times, and adding the solvent to adjust the viscosity to obtain the lithium-supplementing positive electrode slurry. The lithium-supplementing agent is added into the conductive adhesive, so that the lithium-supplementing agent is preferentially mixed with a small amount of components such as the binder and the conductive agent to form the uniform conductive adhesive solution, then the adhesive solution is added into the positive electrode material, the positive electrode main material is infiltrated by the adhesive solution. The wetting angle of the glue solution to the positive electrode main material is less than 90 degrees, so that the processing steps are not increased, and the lithium supplement agent can be effectively dispersed.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium-supplementing cathode slurry, a preparation method and application thereof. Background technique [0002] With the improvement of the energy density requirements of lithium-ion batteries, Si-based negative electrode materials have begun to be used in lithium-ion batteries. However, due to its own characteristics, the Si negative electrode material will lead to the repeated generation of SEI film, which will consume a large amount of Li in the battery system. + , resulting in a significant drop in cell cycle stability. In this context, the industry began to explore the positive lithium supplement Li 2 NiO 2 (hereinafter referred to as LNO) rational use method, LNO charges Li for the first time + The release amount is much larger than that of general-purpose LFP, NCM and other materials. If the LNO is not uniformly dispersed in the slurry, the LNO will onl...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/624H01M4/621Y02E60/10
Inventor 朱立琛殷军曾汉民何巍刘建华刘金成
Owner EVE ENERGY CO LTD
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