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Electrode slurry composition and its preparation method, pole piece coated with it and lithium ion battery comprising the pole piece

A lithium-ion battery and electrode slurry technology, applied in the field of lithium-ion batteries, can solve problems such as active lithium consumption, affecting battery power and low-temperature discharge performance, and serious polarization problems, so as to improve cycle stability and cycle life, improve Battery kinetic performance, good film-forming protective effect

Active Publication Date: 2022-01-07
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the positive electrode active material used in traditional lithium-ion batteries is pure solid phase, which makes it difficult to diffuse lithium ions and has low electronic conductivity. As a positive electrode active material, it brings large impedance in the battery system, and the polarization problem is serious. , the low temperature performance is poor, which will affect the power and low temperature discharge performance of the battery
At the same time, due to the continuous side reactions between the surface of the positive electrode active material and the electrolyte under high voltage, the structure of the surface material of the positive electrode active material is destroyed, and the active lithium is continuously consumed, resulting in poor cycle stability and rapid cycle life decay of the battery.

Method used

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  • Electrode slurry composition and its preparation method, pole piece coated with it and lithium ion battery comprising the pole piece
  • Electrode slurry composition and its preparation method, pole piece coated with it and lithium ion battery comprising the pole piece
  • Electrode slurry composition and its preparation method, pole piece coated with it and lithium ion battery comprising the pole piece

Examples

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preparation example Construction

[0038] In one embodiment of the method for preparing the electrode slurry composition according to the present invention, based on the weight of the electrode active material, the added amount of the phosphate ester additive is 0.2-5%, preferably 0.5-5%.

[0039] In another embodiment of the method for preparing the electrode slurry composition according to the present invention, the phosphate ester additive is a phosphate ester additive shown in the following formula II, III or IV:

[0040] Formula II

[0041] Formula III

[0042] Formula IV

[0043] In another embodiment of the method for preparing the electrode slurry composition according to the present invention, the electrode active material is a positive electrode active material or a negative electrode active material, preferably a positive electrode active material; the conductive agent is selected from conductive carbon black , conductive graphite, Ketjen black, carbon nanotubes, carbon fiber (VGCF), one or m...

Embodiment 1

[0067] Step 1: The positive electrode active material LiNi 6 co 2 mn 2 o 2 The conductive agent Super P and the binder PVDF are added to the NMP at a weight ratio of 97.6:1.3:1.1 for slurry mixing, and then a phosphate ester additive is added during the high-speed dispersion process to obtain a positive electrode slurry composition.

[0068] The addition amount of phosphoric acid ester additive is 0.2wt% of positive electrode active material, and described phosphoric acid ester additive has the structure shown in following formula II:

[0069] Formula II

[0070] Step 2: The positive electrode slurry composition prepared in step 1 is evenly coated on a 12 μm aluminum foil current collector, and after drying, it is rolled and cut by a roller press to obtain a positive electrode sheet with a thickness of 100 μm;

[0071] Step 3: Assemble the positive electrode sheet prepared in step 2 with a suitable negative electrode sheet, separator and electrolyte to form a battery; th...

Embodiment 2

[0074] According to the method of Example 1, the positive electrode sheet is made, assembled into a battery for testing, the difference is that, based on the weight of the positive active material, the amount of the phosphoric acid ester additive added is 0.5wt%, and the phosphoric acid ester additive has Structure shown in following formula III:

[0075] Formula III

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Abstract

Disclosed are an electrode slurry composition for a lithium ion battery and a preparation method thereof, an electrode sheet coated with the electrode slurry composition, and a lithium ion battery including the electrode sheet. The electrode slurry composition includes electrode active material, conductive agent, binder and phosphate ester additive. The preparation method of the electrode slurry composition comprises slurrying electrode active materials, conductive agents and binders in a solvent, and adding the phosphate ester additive during the slurrying process. Because the phosphate ester additive can promote dispersion, reduce surface resistance, reduce polarization and improve slurry conductivity, it can improve the kinetic performance, cycle stability and cycle life of lithium ion batteries.

Description

technical field [0001] The present invention relates to the electrode slurry composition of lithium ion battery and preparation method thereof, more specifically, the present invention relates to a kind of lithium ion battery electrode slurry composition containing phosphate ester additive and its preparation method, and the electrode that is coated with this An electrode sheet of the slurry composition and a lithium ion battery comprising the electrode sheet. Background technique [0002] At present, the positive active material used in traditional lithium-ion batteries is a pure solid phase, which makes it difficult to diffuse lithium ions and has low electronic conductivity. As a positive active material, it brings a large impedance in the battery system, and the polarization problem is serious. , the low-temperature performance is poor, which in turn affects the power and low-temperature discharge performance of the battery. At the same time, due to the continuous side ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/136H01M10/0525
CPCH01M4/62H01M4/628H01M4/131H01M4/136H01M10/0525H01M2004/028Y02E60/10
Inventor 赵慧芳王洋仝俊利乔智
Owner CALB CO LTD