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In order to promote the electrochemical reaction, reduce the resistance of the electrode reaction, the vast majority of lithium battery active materials are used powder materials, including lithium battery cathode material, anode material, adhesive material, conductive material. Lithium battery active materials have to go through the ingredients, with the corresponding solvent mixture, stirring dispersed (or dissolved) uniform, made of slurry process, can be used for the manufacture of lithium batteries.

In the process of mixing pulp, the powder of the active material in the small particles easily lead to dust pollution, dirty working environment. Feeding the end of the bag in the remaining small amount of powder active material, but also easy to dirty working environment. Lithium iron phosphate cathode material and carbon nanotube conductive agent as the representative of dust pollution is particularly serious.
To this end, I developed a lithium battery powder active material for the complete clean clean pulp technology, and carried out the corresponding intellectual property protection layout. Through the lithium battery powder active material in the slurry process, the use of the corresponding soluble packaging bags to pack the powder lithium battery active material (bags outside the bag or the traditional aluminum plastic packaging bags, the bag is soluble Packaging bags), the soluble packaging bags and lithium battery powder active material together into the pulping process used in the solvent, in order to achieve the process of cleaning pulp, completely avoid dust pollution.

PVDF material to the package to illustrate the size of 350mmx460mm size of the bag, the thickness is 40 microns, the weight is 21.76g, the volume is 8 liters. This bag, dissolved in NMP at room temperature for 5 minutes to dissolve. Used to install lithium iron phosphate material, you can install about 6 kg, so the weight of the bag relative to lithium iron phosphate is 21.76 / 6000 = 0.36%. The PVDF added in the positive formula of lithium iron phosphate is usually 2.5% relative to the positive electrode, that is, the amount of PVDF bag relative to the whole PVDF adhesive is only 14.4%, and it does not change and affect the whole bonding effect. Bring impurities, because PVDF bags and adhesives are PVDF material. Even if the amount of PVDF adhesive in the formulation is reduced to 1.5% relative to the positive electrode of lithium iron phosphate, the amount of PVDF bag relative to the total PVDF adhesive is only 24%. This soluble bag, in fact, only to provide a simple anti-powder leakage of the membrane can be. In the production practice, the main packaging strength by aluminum plastic packaging bags to provide, there is a thin layer of soluble PVDF bags can be.

It is necessary to use a PVDF bag with a size of 350mmx460mm and a thickness of 80 microns. The weight is 43.52g and the capacity is 8 liters. It can hold about 17kg NCA and NCM cathode materials. This bag, dissolved in NMP at room temperature for 5 minutes to dissolve. Relative to the positive PVDF, the weight ratio of the bag is 43.52 / 17000 = 0.26%. The common PVDF formulation in the ternary material formulation is 1.5% relative to the positive electrode, which means that the PVDF bag is 17.3% of the total PVDF binder and has no significant effect on the overall bonding effect. Impurities, because PVDF bag is PVDF material. Even if the amount of PVDF adhesive in the formulation is reduced to 1.0% relative to the positive electrode, the amount of PVDF bag relative to the total PVDF adhesive is only 26%.

At present, it is possible to bring about an immediate change in the handling of conductive agents - conductive carbon black, conductive graphite, carbon nanotubes and PVDF adhesives with soluble PVDF bags. The impact of these materials, PVDF bags is completely negligible. For the conductive agent SP feeding, dust is very serious, the urgent need for flexible packaging bags to improve the operation of the feeding environment. This effect is immediate and no side effects. Conductive carbon black SP last year, the domestic sales of thousands of tons. This technology is also applicable to the anode material, the packaging material is made of water-soluble polymer material like.

The benefits of doing so are:

1, completely avoid the use of lithium battery powder active material in the process of dust pollution;

2, can quickly feed;

3, easy to achieve automation;

4, do not need complex tons of bags feeding and air transport process, saving investment equipment investment and costs, do not need to maintain the late feeding equipment;

5, no secondary weighing measurement, you can accurately weight feeding;

6, to avoid sensitive battery materials (such as NCA) contact with air in the water and dust, to avoid the process of air pollution, transport machinery pollution, transport equipment wear and tear pollution;

7, to protect workers health, completely put an end to dust hazards;

8, the production of high-quality batteries need a high degree of clean environment, absolutely no dust pollution is necessary for advanced battery companies.

2016 China's domestic lithium battery cathode material production 16.16 million tons, an increase of 43%, the output value of more than 20 billion yuan. 2016 annual domestic anode material production 122500 tons, an increase of 68.27%, 2016 negative material output value of 6.639 billion yuan, an increase of 64%. In the case of a common 25 kg bag, China's annual positive material industry needs 6.46 million such bags; the annual negative electrode material industry needs 4.9 million such bags; and the adhesive and conductive agent industries also need this Of the flexible packaging bag clean slurry process. Through the soluble packaging bag to achieve the process of cleaning slurry technology solutions to large lithium battery factory to provide such a solution, additional technical fees, is feasible.

The entire battery industry-related materials, will be in the next few times the growth of such a clean slurry slurry process solution demand will be several times the growth. All the lithium battery factory are applicable to such a technology, there is no exclusive. Has been the corresponding intellectual property protection layout, there is no vicious competition. I hope that such a clean slurry slurry process solutions for China's lithium battery production large-scale, automation, human contribution to the power.