Discussion on the Recycling of Waste Lithium Batteries
At present, there are two main types of waste lithium battery recycling: ladder utilization and decomposition recycling. Power batteries are not suitable for electric vehicles. At this time, the reuse value of retired power batteries in the fields of power storage, distributed power generation, low-speed electric vehicles, etc. is called trapezoidal utilization. The performance of power batteries decreases with the increase of charging times. When the battery capacity decreases to less than 80% of the rated capacity, the batteries need to be decomposed and recycled when they cannot be trapezoidal utilized. Then, let's talk about the recycling of waste lithium batteries together!
Step by step utilization of waste lithium battery recycling
Ladder Utilization of Waste Lithium Battery Recycling in the Field of Communication Base Station
With the development of communication technology in China, due to the obvious advantages of lithium batteries in cycle life, energy density and high temperature performance, the demand for batteries in communication base stations is increasing, and there are high requirements for battery life and safety. The application of retired lithium iron phosphate battery in the field of communication base station has great advantages.
When the ladder diagram uses this battery, the recovered battery is unpacked, inspected, and reassembled to obtain a ladder diagram battery with good matching.
Ladder Utilization of Waste Lithium Battery Recycling in the Field of Low-speed Electric Vehicles
In recent years, in the face of the development of low-speed electric vehicles, the low-speed vehicle market with broad prospects will develop rapidly. Among them, there is a great demand for low-speed express delivery vehicles in the express delivery field. If the power battery retired from electric vehicles is used in the low-speed vehicle field, the application prospect of retired power battery in this market is very good.
Decomposition and Recycling of Waste Lithium Batteries
At present, the recycling process of waste lithium batteries mainly includes three steps: pretreatment, secondary treatment of electrode materials and deep recycling. Mainly through crushing or screening to remove harmful sources, decomposition of waste batteries, to achieve simple separation and classification of the secondary treatment, is to deal with the battery composition according to the purpose, dissolve the internal mixture, each step contains a variety of treatment methods, the recycling of power batteries is also very complex. For the pretreatment of waste batteries, there are four general recovery processes: chemical recovery, physical recovery, biological recovery and combined method. According to different treatment methods, the general method is acid dissolution and acid dissolution/alkali dissolution of the internal mixture of the battery; deep recovery is In order to obtain cathode materials, chemical recovery processes are divided into wet recovery technology and pyrotechnic recovery technology.
Recycling and Pretreatment of Waste Lithium Batteries
If the direct treatment of lithium batteries, the battery may be short-circuited, rapid heating, resulting in security risks. The pretreatment process is mainly based on physical method and crushing and sorting. In order to safely dispose of waste lithium batteries, please discharge the waste lithium batteries before pretreatment to make the waste lithium batteries in a safe state. It specifically includes processes such as mechanical peeling of the battery case (metal/plastic), crushing of the electrode material, and sorting of the crushed material.
Secondary Treatment of Waste Lithium Battery Recycling
The secondary treatment process of recycling waste lithium batteries is actually a dissolution-leaching method to treat the electrode material. The commonly used deep recovery technologies include chemical recovery, physical recovery and biological recovery. According to the different treatment methods, the pretreated electrode material is dissolved in acid-base solution. In this process, the metal ions in the material are reduced to metal or the corresponding oxides, chlorides and other inorganic salts are the key to the whole process system. Chemical recovery technology is divided into wet recovery technology and fire recovery technology.
Physical recovery process
The physical recovery process mainly refers to the process of recycling the internal components of the waste power battery after obtaining valuable products. Such as electrode active material, current collector and battery shell and other components through crushing, screening, magnetic separation, micro crushing and separation of a series of means.
chemical recovery process
The pyrotechnic recovery technology of the method recovery process first needs to discharge the waste battery. The carbon and organic matter in the electrode fragments are burned at high temperature, and reducing gas is generated during combustion to protect the metal elements in the electrode. Then, the metal shell and the electrode material part are separated by vibration separation and magnetic separation according to the battery types, and the electrode material part is put into the dry electric arc furnace for high temperature treatment. Fine powder materials containing metals and metal oxides are obtained by screening.
Wet recovery wet recovery process is to break and dissolve the waste battery, wet recovery treatment is suitable for the recovery of chemical composition is relatively single waste lithium battery, the use of chemical reagents to selectively separate the metal elements in the leaching solution, the output of high-grade metal materials, direct recovery. The equipment has low investment cost and is suitable for the recovery of small and medium-sized waste lithium batteries. Therefore, this method is still widely used at present.
With the development of bio-metallurgical technology, the use of acidophilic bacteria bioleaching electrode materials is a relatively new low-energy process, but it is limited by factors such as culture cycle and optimal control.
joint recovery method
The recycling technology of waste lithium battery recycling has its advantages and disadvantages. At present, in order to give full play to the advantages of various recycling methods and realize the economic benefits, the research on the recovery method of optimizing the combination of various technologies is being carried out.
The above introduction is to talk about the recycling of waste lithium batteries, if you need to know more, you can contact us at any time!