In the field of used lithium-ion batteries, an innovative method and system is emerging. These batteries, which once carried the pulse of energy, are now being reborn in our hands. They consist of an outer shell, a positive electrode, a negative electrode, a diaphragm and an electrolyte, each of which has the potential to be reused.
At present, the mainstream technology, like a delicate craftsman, crushes the waste battery under a protective atmosphere, and then carries out multi-level physical sorting to disassemble each component one by one. However, in the actual production process, we found that sorting the housing and diaphragm in one go is as difficult as walking on thin ice. Even with the pyrolysis technology, although the binder in the cathode material is carbonized, the efficiency of sorting the black powder is still not satisfactory.
So, we came up with a new solution: how to make black powder more efficient and pureer? This is the technical challenge before us and the driving force behind our pursuit of innovation.
Our invention, a method for crushing and sorting waste lithium-ion batteries, was born to solve this problem. It can not only efficiently ** high purity black powder, but also achieve the grading of black powder ** in the ** process, making the removal of the diaphragm easier.
So, how exactly does this work out?
First of all, after the lithium-ion battery is broken, under the protection of inert gas, it is heated to 60 150, so that the solvent in the electrolyte volatilizes to obtain the first and first solid. This step is like "drying" the battery and preparing it for further sorting.
Next, we remove the battery shell from the first solid to obtain the second solid. The purpose of this step is to reduce the burden of subsequent sorting and make the sorting process smoother.
Then, we sieve the second solid to obtain the first, the first sieve and the first sieve. This is the first time we have sieved black powder that contains free black powder**.
Next, we remove the diaphragm by air flow separation to obtain a third solid. This step is the initial separation of the diaphragm, which creates favorable conditions for the subsequent black powder**.
After that, we pyrolyze the first sieve material and the third solid, so that the lithium salt is decomposed and the binder on the electrode piece and the separator is pyrolyzed and carbonized to obtain the fourth solid. This step is to further separate the black powder from other components and improve the purity of the black powder.
We sieve the fourth solid to obtain a second sieve and a second sieve top. The second sieve is the black powder we dream of. The second sieve material is crushed and screened to obtain the third sieve material and the third sieve upper object. The third sieve material is the second black powder, and the third sieve material is the metal substrate particle of the pole piece.
Compared with the existing technology, our innovation points are:
1.We have optimized the process of black powder to achieve the grading and high purity of black powder. Through the steps of heating, sieving and pyrolysis, we have improved the ** rate and purity of black powder, making black powder ** more efficient and pure.
2.We have made it easier to remove the diaphragm and reduced the entrainment of black powder. By heating the volatile solvent first, then removing the shell, screening, and finally removing the diaphragm, we reduce the difficulty and wind force of the diaphragm airflow separation, and reduce the probability of the black powder being pumped away. At the same time, the first removal of the shell also creates favorable conditions for subsequent screening, avoiding the problem of black powder accumulation and reduction of the first rate caused by the movement of the shell with the diaphragm in the screen.
Overall, our invention not only improves the efficiency and purity of used lithium-ion batteries, but also reduces the difficulty and cost of the production process. This is an important innovation in the field of waste batteries, and it is also a part of our contribution to the cause of environmental protection.