Recycling and Regeneration of Lithium Batteries
Under the pursuit of economic and environmental protection, the production and demand of lithium batteries have grown in recent years. Decommissioned lithium batteries are known as high-grade mines, coupled with the price and mining of raw materials, so the recycling value is obvious.
The global demand and the proportion will both rise
Benefiting from the global trend of energy conservation and emission reduction and the EU carbon emission agreement, the global lithium electricity market has entered a period of rapid demand development after 2018. According to Deloitte data, from 2017 to 2020, the global demand for lithium-ion batteries continued to rise, and the annual compound group growth rate reached 22.17%, of which the power battery installed capacity accounted for nearly 18 percentage points increased. In 2020, the global demand for Li-ion batteries reached 279GWh, while power batteries reached 54.5%.
It is expected that as the global penetration rate of electric vehicles will continue to improve, the compound annual growth rate of 34.4% from 2021-2025 will be 34.4%, and in 2025, the overall global demand for lithium battery will reach 1223GWh, power battery accounts for 75.2%.
In other words, the global demand for lithium batteries and the proportion of power batteries will both rise steadily.
Figure 1. Global Li-ion demand (installed) and forecast (in∶GWh, %) for ∶ 2017-2025
Source: Deloitte Forward looking Industry Research Institute collation @ Forward-looking economist, APP
Raw material prices of lithium batteries are high
The raw materials of lithium battery mainly positive and negative materials, electrolyte, diaphragm and fluid, etc. . Among them, cathode materials are the most critical raw material for lithium batteries, including lithium carbonate and lithium hydroxide. Since 2020, the factory price of battery grade lithium carbonate has increased from the minimum of $6502 to $27093 each ton or more; the market transaction price of lithium hydroxide has increased from the minimum of $6657/ton to between $26319-27867/ton. (according to the China’s website in November 2021)
High-grade metal mine
Figure 2. Lithium battery components
Source: the picture from website
Li-ion battery (LIB) contains a lot of Co, Li, Mn, and other valuable metals, so it can be said that spent LIB is a high-grade metal mine. Lithium hexafluorophosphate is easy to decompose and catabolite bind to steam to form hydrofluoric acid. At the same time, organic electrolytes are easily decomposed into formaldehyde and harmful gases such as ketones, which seriously threaten people’s health. From the perspective of resource recycling and environmental protection, the recycling of waste lithium-ion batteries is of great significance.
As the popularity of electric vehicles starts to grow explosively, so does the pile of spent lithium-ion batteries that once powered those cars. Reasonable disposal of retired lithium batteries can promote the development of renewable and sustainable energy. The methods of separating electrode material from aluminum foil and copper foil are highlighted here.
Methods introduction
1 ) Method of separating collecting fluid and electrode materials
Figure 3. Process of recovering positive electrode materials using DMF
Source: the picture from website Electrochemical person
2 ) Separation of foil of aluminum/copper from electrode material by heating
Figure 4. Experimental apparatus for releasing the electrode material by incineration and shock
Source: the picture from website called Electrochemical person
Figure 5. Flow chart of the method for separating cathode material and complete aluminum foil using low-temperature molten salt
Source: the picture from website called Electrochemical person
3 ) Separation aluminum/copper foil from electrode material by mechanical method.
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