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Lithium ion battery cathode material pulp and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of long time for slurry preparation, affecting the performance of making batteries, and low efficiency of equipment use, so as to improve the two Sub-agglomeration phenomenon, overcoming the formation of negative electrode slurry particles, and improving the effect of equipment utilization

Inactive Publication Date: 2018-11-27
桑顿新能源科技(长沙)有限公司
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Problems solved by technology

In the preparation process of lithium-ion batteries, the quality of the battery negative electrode material slurry directly affects the performance of lithium-ion batteries. In the existing battery production technology, the usual mixing method is to gradually add solid powder into the solvent, so that The slurry particles are larger, the surface coating of the pole piece shrinks, and the adhesion is weak
[0003] The Chinese patent with the publication number CN108134043A discloses a preparation method of lithium-ion battery slurry. After repeated grinding and kneading of high-solid content premixed slurry with a stone mill, it is diluted and stirred in a planetary mixer to obtain a uniform and excellent lithium-ion battery. Slurry, improve the uniformity and material wettability of lithium ion battery slurry, reduce the problem of shrinkage cavity, but this preparation method is still prone to sedimentation and delamination, resulting in poor consistency of the slurry, long time required for slurry preparation, The efficiency of the equipment is not high, and the energy consumption is large. At the same time, graphite is used as the negative electrode material, and there is a problem of graphite bridging, which affects the performance of the battery.

Method used

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  • Lithium ion battery cathode material pulp and preparation method thereof
  • Lithium ion battery cathode material pulp and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Use 30L double planetary stirring (high kneading stirring, the highest stirring parameters: stirring 25 rpm; dispersing 2100 rpm).

[0032] Negative electrode material formula (relative to negative electrode active material mass proportion): artificial graphite: 90.5%, conductive carbon black: 3.8%, CMC (sodium carboxymethyl cellulose): 2.2%, SBR (styrene-butadiene rubber): 3.5%, deionized Water: 100%.

[0033] Such as figure 1 As shown, the negative electrode material preparation steps are as follows:

[0034] Step 1: Add artificial graphite, conductive carbon black, and CMC into the mixer for pre-mixing for 10 minutes. Stirring method: forward rotation, stirring speed revolution: 10r / min, dispersion: 0 rpm;

[0035] Step 2: Add deionized water equivalent to 30% of the total amount of negative electrode active materials into the mixer for initial mixing and stirring for 20 minutes. When stirring, set the temperature at 30°C to 40°C, and cool it with cooling water whe...

Embodiment 2

[0041] Use 30L double planetary stirring (high kneading stirring, the highest stirring parameters: stirring 25 rpm; dispersing 2100 rpm).

[0042] Negative electrode formula: artificial graphite: 97%, conductive agent 1%, CMC (sodium carboxymethyl cellulose): 1.0%, SBR (styrene-butadiene rubber): 1.0%; deionized water: 90%

[0043] Step 1: Add artificial graphite, conductive agent, and CMC into the mixer and pre-mix for 10 minutes. Stirring method: forward rotation, stirring speed revolution: 6r / min, dispersion: 0 rpm;

[0044] Step 2: Add 35% deionized water into the mixer for initial mixing and stirring for 20 minutes. When stirring, set the temperature at 30°C to 40°C, and cool down with cooling water when the temperature exceeds 40°C. Stirring method: forward rotation, stirring speed revolution: 15r / min, dispersion: 0 turns;

[0045]Step 3: Add 30% deionized water into the blender and stir for 30 minutes. When stirring, set the temperature at 30°C to 40°C. If the tempera...

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Abstract

The invention provides a preparation method for a lithium ion battery cathode material pulp. According to the invention, a high kneading stirring technology is adopted for quickly stirring and mixingactive materials and a conductive agent, and the small-grain powder is attached to large particles, so that the surface energy is reduced, the probability of the small-grain powder of agglomerating and forming large particles in solvents is reduced, the adhesive force of energy-repulsive reinforced glue chains between particles is increased, the time for preparing the pulp is reduced, the use rateof device is increased, the capacity is increased, the forming of cathode pulp particles is overcome and the problem of weak binding force of the pole piece is solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a lithium ion battery negative electrode material slurry and a preparation method thereof. Background technique [0002] Lithium-ion battery is one of the most commonly used battery types in electric vehicles at present. Although it has not been born for a long time since its birth in 1970, it can be charged quickly due to its high working voltage, large specific energy, long cycle life, and no memory effect. And the advantages of no environmental pollution quickly occupied the vast majority of the electric vehicle battery market. At the same time, with the gradual strengthening of energy and environmental protection awareness, new energy vehicles have achieved considerable development in recent years. Among them, electric vehicles are one of the main directions, and lithium-ion batteries occupy a very important position in the power batteries of electric ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M10/0525
CPCH01M4/04H01M4/628H01M10/0525Y02E60/10
Inventor 张世勇胡阳鹏梁凯陈小平
Owner 桑顿新能源科技(长沙)有限公司
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