Commonly used lithium ion battery material recovery technology and development status

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

With the rapid development of society, our lithium-ion battery material recycling technology is also developing rapidly. So you understand the detailed information of lithium-ion battery material recovery technology? Next, let Xiaobian lead everyone to learn more about knowledge. Lithium-ion batteries have a wide range of applications, with the use of tablets, smartphones and supernators, is expected to be around 2020, and the application of traditional small lithium-ion batteries will present a large new trend.

At the same time, the recycling problem of a large number of waste lithium-ion batteries is more prominent, using traditional methods such as landfill, incineration, etc., which are wasteful, and the environment has caused pollution, and even giving human health. Hazard.

At present, my country has become an important lithium-ion battery producer and consumption in the world, and the battery consumption has reached 8 billion. If you do not have systematic processing of abandoned lithium-ion batteries, severe waste of resources, pollute the environment, and harm human health. It can be seen that the recycling market of waste lithium ion batteries is broad.

The lithium ion battery consists of a positive electrode plate and a negative electrode plate, a binder, an electrolyte, and a separator. In industrial, the manufacturer is important to use lithium cobalt-cobaltate, lithium manganate, nickel-manganese acid lithium ternary material and lithium iron phosphate as a positive material, natural graphite and artificial graphite as an airective active material. Polyvinylidene fluoride (PVDF) is a widely used positive electrode adhesive having high viscosity, good chemical stability and physical properties.

Industrial production of lithium ion batteries Important use a solution of lithium hexafluorophosphate (LiPF6) and organic solvent as an electrolyte, and an organic film such as polyethylene (PE) and polypropylene (PP) is used as a battery diaphragm. Lithium-ion batteries are often considered environmentally-friendly and non-pollutable green batteries, but the lithium-ion battery recovery will also cause pollution. Although lithium-ion batteries do not contain a toxic weight metal such as mercury, cadmium and lead, but the influence of the positive and negative electrode material, electrolyte, etc.

of the battery is still larger. On the one hand, due to the huge market demand of lithium ion batteries, a large number of waste lithium ion batteries will appear in the future. How to deal with these lithium-ion batteries and reduce their impact on the environment is an urgent problem.

On the other hand, in order to meet the huge demand of the market, the lithium-ion battery manufacturer has to produce a large number of lithium-ion batteries to supply the market. Lithium ion batteries are typically composed of heavy metals, organic compounds, and plastics, with a mass ratio of heavy metals account for 15% -37%, and organic compounds account for 15%, and plastics account for 7%. In general, in the composition of the lithium ion battery, the positive electrode active material, that is, heavy metals, the environment, and has higher recovery value.

The recovery process of waste lithium ion batteries is important including pretreatment, secondary processing and depth processing. Since there are still some electricity left in the waste battery, the pretreatment process includes depth discharge processes, crushing and physical sorting. The purpose of secondary treatment is to completely separate the positive and negative electrode active substances and substrates.

Usually dissolved using heat treatment and organic solvent. Alkali solubility and electrolysis method realize the complete separation of both; depth treatment Important includes two processes, separation, and purifying two processes to extract valuable metal materials. According to the classification of the extraction process, the battery recovery method can be divided into three categories: dry recovery, wet recovery and biological recovery.

The wet recovery process is pulverized and dissolved using a suitable chemical reagent, and then selectively separated the metal elements in the perfiltration solution to produce direct recovered high-grade metal cobalt or lithium carbonate, etc. The wet recovery process is more suitable for the recovery of chemical components relatively single waste lithium-ion battery, with low equipment cost, and is suitable for recovery of small and medium-sized planned waste lithium-ion batteries. Therefore, the method is now widely used.

Dry recovery means direct recovery materials or precious metals without media such as solutions. Among them, the important way to use is physically separated and high temperature. Mishra et al.

It is used to recover cobalt and lithium in the waste-ranging lithium ion battery using eosinophilic oxide, and the effects of leaching time, temperature, stirring speed and other factors on the leaching effect of metal cobalt in waste lithium ion batteries. The results show that although this method supplies a new method for recovery of cobalt elements, the leaching rate of lithium acidophilic acid is very low. In the future, a bacterium having a higher cultivation rate is compared with other methods, the biological leaching method has a small amount of acid, the cost is simple, and the environmental impact is small.

The above is the detailed analysis of the knowledge of the recovery technology of lithium ion battery materials. It is necessary to keep accumulating relevant experience in practice, so that you can design better products and better develop for our society.

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