Lithium ion battery cathode slurry and preparation method thereof

A lithium-ion battery and negative electrode slurry technology, which is applied in the direction of electrode manufacturing, secondary batteries, active material electrodes, etc., can solve the problems of insufficient stability, high cost of oily slurry, poor consistency of slurry, etc., and achieve stability Effects of improvement and cost reduction

Inactive Publication Date: 2009-12-23
JIANGSU FRONT NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the negative electrode slurry for lithium ion batteries is generally water-based (the solvent is water) and oily (the solvent is nitrogen-methylpyrrolidone, NMP). The production cost of the water-based slurry is low, but the stability is not high enough, and it is easy to occur Slurry deposition phenomenon, resulting in poor consistency of the slurry, uneven thickness distribution of the coated pole piece, affecting the performance of the battery, and the cost of oily slurry is high, and lithium-ion batteries are facing the pressure of urgent cost reduction

Method used

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  • Lithium ion battery cathode slurry and preparation method thereof
  • Lithium ion battery cathode slurry and preparation method thereof
  • Lithium ion battery cathode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This example illustrates the preparation method of the oil-water mixed negative electrode slurry and the battery produced by the present invention.

[0019] 1. Preparation of negative electrode

[0020] Add 2700g deionized water and 340g NMP into the mixing tank to make a solution, then add 120g binder LA132 (Chengdu Yindile Power Technology Co., Ltd.), mix and stir for 6-8 hours to make glue, and then add 2300g graphite, 50g Add carbon black, mix and stir for 8-12 hours (use graphite, carbon black, and binder LA132 as solid raw materials, take 25g / part as an example), make a slurry, and apply it on a 12μm copper foil with a coater. After heating and drying in vacuum at 135°C for 3 hours, roll pressing into 550mm (length) × 122mm (width) × 130μm (thickness) pole pieces, the compacted density is 1.3g / cm 3 .

[0021] 2. Preparation of positive electrode

[0022] Add 4350g of dried lithium manganate, 175g of carbon black, and 225g of polyvinylidene fluoride (PVDF, F2) i...

Embodiment 2

[0037] Embodiment 2: performance test of slurry of the present invention

[0038] 1. Slurry Stability Test

[0039] Put the slurry into a test tube and seal it, place it vertically, and test the change of the deposition rate with the time of holding it, the results are shown in figure 1 .

[0040] Sedimentation rate = supernatant liquid height of slurry / total slurry height × 100%

[0041] From figure 1 From the data, it can be seen that the stability of Example 1 (mixed negative electrode slurry) and Comparative Example 2 (oily negative electrode slurry) is equivalent, which is obviously better than that of Comparative Example 1 (water-based negative electrode slurry).

[0042] 2. Battery performance test:

[0043] 1. Battery internal resistance test

[0044] Use the internal resistance meter to measure 8 pieces of each battery, and the test results are shown in Table 1

[0045] Table 1

[0046]

[0047]

[0048] It can be seen from the actual data that the inte...

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Abstract

The invention belongs to the field of lithium ion batteries and discloses lithium ion battery cathode slurry and a preparation method thereof. The formula of the slurry is as follows: solid raw materials comprise 90-94 weight parts of graphite, 1-2 weight parts of carbon black and 4-5 weight parts of binding agent LA 132; a solvent is prepared by mixing deionized water with methylpyrrolidone according to the weight ratio of 7:1-12:1; and the weight ratio between the solid raw materials and the liquid material is 1:1.1-1.3. The oil-water mixed slurry prepared according to the preparation method has greatly reduced cost when being compared with oily slurry, can improve the stability of the slurry when being compared with aqueous slurry, and exerts no negative influence on the performance of a battery.

Description

Technical field: [0001] The invention belongs to the field of lithium batteries, and relates to an oil-water mixed type lithium ion battery negative electrode slurry and a preparation method thereof. Background technique [0002] At present, the negative electrode slurry for lithium ion batteries is generally water-based (the solvent is water) and oily (the solvent is nitrogen-methylpyrrolidone, NMP). The production cost of the water-based slurry is low, but the stability is not high enough, and it is easy to occur The phenomenon of slurry deposition leads to poor consistency of the slurry and uneven thickness distribution of the coated pole pieces, which affects the performance of the battery. However, the cost of oily slurry is high, and lithium-ion batteries are facing the pressure of urgent cost reduction. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above two technical formulas, and to provide a negativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/36H01M10/40
CPCY02E60/122Y02E60/10
Inventor 吴丽军袁春刚王青魏廷全韩伟
Owner JIANGSU FRONT NEW ENERGY
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