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18650 battery 4800mah material recycling status and recycling technology
18650 battery 4800mah material recycling status and recycling technology. At present, China is the world's largest producer and consumer of lithium-ion batteries, with annual battery consumption reaching 8 billion. If discarded lithium batteries are not systematically processed and recycled, it will seriously waste resources, pollute the environment, and endanger human health. It can be seen that the recycling and reuse of waste lithium batteries has a broad market.
Current status of 18650 battery 4800mah material recycling
Due to the accelerated upgrading of consumer electronics products and the continued promotion of lithium-ion batteries in the field of electric vehicles, a large amount of waste lithium-ion batteries has been produced in recent years.
The huge market demand for lithium-ion batteries will, on the one hand, lead to the emergence of a large number of used batteries in the future. How to deal with these used lithium-ion batteries to reduce their impact on the environment is an urgent problem; on the other hand, in order to cope with the huge market Demand, lithium battery manufacturers need to produce a large number of lithium-ion batteries to supply the market.
In the pretreatment stage, how to realize the automatic disassembly of waste lithium-ion batteries safely and efficiently is a major obstacle to the industrial recycling of waste lithium-ion batteries; how to systematically recycle and reuse the components in waste lithium-ion batteries, how to reduce Or to avoid these secondary pollution, this requires further in-depth research.
18650 battery 4800mah material recycling technology
The recycling process of used lithium-ion batteries mainly includes pre-treatment, secondary treatment and advanced treatment. Since some power is still left in used batteries, the pretreatment process includes deep discharge process, crushing, and physical sorting; the purpose of secondary treatment is to achieve complete separation of positive and negative active materials from the substrate. Heat treatment and organic solvent dissolution are commonly used. , alkali solution dissolution method and electrolysis method to achieve complete separation of the two; advanced treatment mainly includes two processes of leaching and separation and purification to extract valuable metal materials.
According to the classification of extraction process, lithium battery recycling methods can be mainly divided into three major categories: dry recycling, wet recycling and biological recycling.
1. Dry recycling
Dry recycling refers to the direct recovery of materials or valuable metals without using media such as solutions. Among them, the main methods used are physical separation method and high temperature pyrolysis method.
2. Wet recycling
The wet recycling process is to crush and dissolve the waste batteries, and then use appropriate chemical reagents to selectively separate the metal elements in the leaching solution to produce high-grade cobalt metal or lithium carbonate, etc., for direct recycling. Wet recycling is more suitable for recycling waste lithium batteries with a relatively single chemical composition. Its equipment investment cost is low, and it is suitable for the recycling of small and medium-sized waste lithium batteries. Therefore, this method is currently widely used.
3.Biological recycling
Mishra et al. used inorganic acid and acidophilic Thiobacillus ferrooxidans to leach metals from used lithium-ion batteries, and used S and ferrous ions (Fe2+) to generate H2SO4, Fe3+ and other metabolites in the leaching medium.
Lithium battery recycling technology
1. High temperature metallurgy
Use high-temperature roasting and simple mechanical crushing of discarded lithium-ion batteries to obtain fine powder containing metals and metal oxides.
2. Hydrometallurgy
After crushing the waste batteries, use appropriate chemical reagents to selectively dissolve them and separate the metal elements in the leachate.
3. Physical disassembly
The battery components are crushed, screened, magnetically separated, finely pulverized and classified to obtain high-content materials, which are then recycled in the next step.
Summary: Improper recycling of lithium-ion batteries can also cause pollution. Although lithium-ion batteries do not contain toxic heavy metals such as mercury, cadmium, and lead, the positive and negative electrode materials and electrolytes of the battery still have a large impact on the environment and human body. Used lithium-ion batteries need to be recycled to reduce harm to the natural environment and human health.
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