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 particle

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

Experimental program
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Example Embodiment

[0040] Example 1

[0041] The present embodiment provides a positive electrode paste replenishing lithium, lithium positive electrode slurry prepared in the patch is as follows:

[0042](1) N- methylpyrrolidone and polyvinylidene fluoride were mixed sequentially added carbon nanotubes and the conductive carbon black was vacuum SP stirring, the dispersion speed of 2000 rpm, the dispersion time is 180min, half a step to obtain a conductive glue;

[0043] Half step and the conductive glue Li (1) obtained in (2) the step of 2 NiO 2 After mixing of complement lithium stirred at 30 rpm, mixing speed of 2000 rpm of the dispersion, the dispersion time was 90min, to obtain an electroconductive adhesive, the mass fraction of the conductive glue LNO 10%, mass fraction of carbon nanotubes was 1%, SP the mass fraction of 2%;

[0044] (3) The initial powder was added an electroconductive adhesive to the NCM, the control of the entire solids content of the slurry was 93%, the dispersion was stir...

Example Embodiment

[0047] Example 2

[0048] Difference between the present embodiment and the embodiment 1 only in that Step (2) mixing said conductive glue dispersion speed was 500 rpm for, other conditions and parameters are the same as in Example 1.

[0049] The complement dispersion slurry as a positive electrode of lithium FIG. image 3 Indicated by image 3 As can be seen, the positive electrode slurry prepared in Example of the present embodiment slight agglomeration.

Example Embodiment

[0050] Example 3

[0051] Difference between the present embodiment and the embodiment 1 only in that, in step (2) of the conductive glue is 3500 rpm for the mixing speed dispersion, with the other conditions the same as in Example 1 parameters.

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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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