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Lithium-ion battery positive electrode slurry and preparation method and lithium-ion battery positive electrode plate

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor battery cycle performance, achieve better cycle performance, improve processing performance, and improve adhesion effect of effect

Active Publication Date: 2019-10-25
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the present invention also uses carbon nanotubes and superconducting carbon black, which is a conductive agent compounded by lines and dots, to give the surface of the pole piece a better transmission channel, thereby making the cycle performance of the battery more excellent, and solving the problem of high-density pole pieces. The problem of poor battery cycle performance caused by sheet accumulation

Method used

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  • Lithium-ion battery positive electrode slurry and preparation method and lithium-ion battery positive electrode plate
  • Lithium-ion battery positive electrode slurry and preparation method and lithium-ion battery positive electrode plate

Examples

Experimental program
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Embodiment 1

[0033] The preparation process of positive electrode slurry in this embodiment is as follows figure 1 As shown in , add Solvay PVDF 5130 into N-methylpyrrolidone and stir and mix to make an adhesive glue solution with a solid content of 6%. The adhesive glue solution is divided into two parts, respectively accounting for the The first glue solution of 40% of the binder glue quality, and the second glue solution of the remainder;

[0034] Add the polyphosphazene additive [NP(Ph)F]n into N-methylpyrrolidone and stir and mix to prepare an additive glue with a solid content of 6%;

[0035] With Li[Ni 0.8 co 0.1 mn0.1 ]O 2 As the positive active material, in Li[Ni 0.8 co 0.1 mn 0.1 ]O 2 Add superconducting carbon black and mix evenly, then add the first glue, after stirring and kneading, add the carbon nanotube slurry (wherein the diameter of the carbon nanotube is 8nm, and the length of the tube is 5 μm) with a solid content of 6%, continue to stir, Finally, add the second...

Embodiment 2

[0038] The preparation of the positive electrode slurry in this example is exactly the same as that in Example 1.

[0039] Coat the prepared positive electrode slurry evenly on the aluminum foil, and the surface density of one side coating is 300g / m 2 Bake and dry to obtain a positive electrode sheet.

Embodiment 3

[0041] The preparation of the positive electrode slurry in this example is exactly the same as that in Example 1.

[0042] Coat the slurry evenly on the aluminum foil, the surface density of one side coating is 150g / m 2 Bake and dry to obtain the desired positive electrode sheet.

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Abstract

The invention discloses lithium-ion battery positive electrode slurry and a preparation method and a lithium-ion battery positive electrode plate. The lithium-ion battery positive electrode slurry ismade of a positive electrode active material, a binder, a conductive agent and a solvent. The positive electrode slurry includes an additive which is polyphosphazene additive [NP(Ph)F]n. The conductive agent is a mixture of superconducting carbon black and carbon nanotubes. The combination of the traditional binder and the novel additive improves the flexibility of the electrode sheet obviously. The slurry is composited from a composite conductive agent, carbon nanotubes and superconducting carbon black (line and point), which makes the electrode plate have a better electron transport channeland better cycle performance while having high stacking density.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery positive electrode slurry and a preparation method thereof, and also relates to a lithium ion battery positive electrode sheet made of the positive electrode slurry. Background technique [0002] Lithium-ion battery refers to the general term for batteries with lithium-ion intercalation compounds as positive electrode materials. The charging and discharging process of lithium-ion batteries is the intercalation and deintercalation process of lithium ions. As the four key materials of lithium-ion batteries, positive electrode, negative electrode, separator, and electrolyte have an important impact on the performance of lithium-ion batteries. [0003] Among them, the positive electrode is an important factor that determines the performance and cost of lithium batteries, and is also a key factor that restricts the further improvement of battery ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/623H01M10/0525H01M2004/028Y02E60/10
Inventor 吴小兰王光俊刘成士
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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