With curiosity about electric vehicles at an all-time high, attention has turned to lithium-ion batteries. Are they dangerous? What effects do they have on the environment? Are we exchanging one set of problems for another if we turn to this form of energy? With these questions in mind, I will take you to read this article. We will explain to you in three parts what the main material composition of lithium batteries is, why they need to be recycled, and how we can increase their recyclability through recycling.
1. Progress of Recycling Lithium-ion Batteries
Difficulties of recycling
Recycling lithium-ion batteries poses several challenges due to their complex composition and potential environmental risks. Here are some difficulties we face:
a. The chemical composition of lithium-ion batteries is complex
b. There are certain environmental requirements for the use of lithium-ion batteries
c. Complex disassembly
d. Batteries contain toxic substances and harmful materials, and improper handling can pollute the environment
e. The energy consumption in the recycling process is enormous
Methods to recycle
At present, lithium-ion batteries are at the heart of nearly every electric vehicle, laptop and smartphone, and they are essential to storing renewable energy in the face of the climate emergency. But all of the world’s current mining operations cannot extract enough lithium and other key minerals to meet skyrocketing demand for these batteries. How to improve the utilization rate of lithium again is an urgent problem that we need to face and solve. Next, we will disassemble the recycling process of lithium-ion batteries based on their working principles.
Composition of lithium-ion batteries
Lithium-ion battery consists of positive electrode material, negative electrode material, organic diaphragm, electrolyte and shell. The cathode materials mainly include aluminum foil and active substances such as lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium iron phosphate, etc., which are bonded to the surface of the aluminum foil; the anode materials mainly include copper foil and graphite powder bonded to the surface of the copper foil.
Steps to recycling
The method of recovering waste lithium-ion batteries by a whole component of a lithium battery recycling equipment, said comprising the following steps: 1 discharge treatment, 2 crushing treatment, 3 recovery of electrolyte: 4 sorting, separating the diaphragm with an airflow sorter; obtaining copper powder, aluminum powder, and a mixture of materials containing graphite powder and cathode powder respectively separating the copper powder and aluminum powder, and separating the copper powder and aluminum powder with a purity of 97.32% or more. 5 sieving: passing the The obtained mixture material is separated by means of FM vibrating sieve, and graphite powder and anode powder are obtained respectively. The graphite powder and anode powder have differences in particle size and specific gravity, which are separated by means of FM vibrating sieve to get graphite powder and anode powder respectively, and the purity of the recovered graphite powder and anode powder is more than 97.61%.
When a lithium-ion battery is providing power, a cluster of lithium ions moves from one crystalline “cage” (the anode) to another (the cathode). The most common methods currently used to recycle these batteries involve dismantling and shredding the whole battery, then either melting it all down or dissolving it in acid. The result is a black mass—with a texture can that can vary from powder to goo—from which chemical elements or simple compounds can be salvaged. Those recovered products can then go through the same commercial manufacturing process that newly mined elements do to make cathodes. Some of the key components of the old cathodes are retained through a range of technical means, but instead of breaking the batteries down completely into their constituent chemical elements. They pulverize the batteries, physically remove the less expensive parts (such as the electronic circuitry and steel battery casing), and then recycle them separately. What remained was mostly cathode material; they dissolved it in acid and then removed impurities. Small amounts of the new elements that make up the cathode, such as nickel and cobalt, are then carefully added to make sure that the compositional ratio is just right – another difference from ordinary recycling methods. After a few more processes, the result is an effectively refreshed cathode powder, which consists of tiny crystalline particles that can be stuck to metal strips and put into “new” batteries.
1. Reason of Recycling Lithium-ion Batteries
A. Cost savings
There are a great number of benefits to recycle the lithium-ion batteries. According to Battery specialists and environmentalists who give a long list of reasons to recycle Li-ion batteries. The materials recovered could be used to make new batteries, lowering manufacturing costs. Currently, those materials account for more than half of a battery’s cost. The prices of two common cathode metals, cobalt and nickel, the most expensive components, have fluctuated substantially in recent years. Current market prices for cobalt and nickel stand at roughly $27,500 per metric ton and $12,600 per metric ton, respectively. In 2018, cobalt’s price exceeded $90,000 per metric ton.
In many types of Li-ion batteries, the concentrations of these metals, along with those of lithium and manganese, exceed the concentrations in natural ores, making spent batteries akin to highly enriched ore. If those metals can be recovered from used batteries at a large scale and more economically than from natural ore, the price of batteries and electric vehicles should drop.
B. Environmental protection
In addition to potential economic benefits, recycling could reduce the quantity of material going into landfills. Cobalt, nickel, manganese, and other metals found in batteries can readily leak from the casing of buried batteries and contaminate soil and groundwater, threatening ecosystems and human health, says Zhi Sun, a specialist in pollution control at the Chinese Academy of Sciences. The same is true of the solution of lithium fluoride salts (LiPF6 is common) in organic solvents that are used in a battery’s electrolyte.
Batteries can have negative environmental effects not just at the end of their lives but also long before they are manufactured. As Argonne’s Gaines points out, more recycling means less mining of virgin material and less of the associated environmental harm. For example, mining for some battery metals requires processing metal-sulfide ore, which is energy intensive and emits SOx that can lead to acid rain.
C. Promote resource utilization
Less reliance on mining for battery materials could also slow the depletion of these raw materials. Gaines and Argonne coworkers studied this issue using computational methods to model how growing battery production could affect the geological reserves of a number of metals through 2050. Acknowledging that these predictions are “complicated and uncertain,” the researchers found that world reserves of lithium and nickel are adequate to sustain rapid growth of battery production. But battery manufacturing could decrease global cobalt reserves by more than 10%.
D. Improving international security
There are also political costs and downsides that recycling Li-ion batteries could help address. According to a CSIRO report, 50% of the world’s production of cobalt comes from the Democratic Republic of the Congo and is tied to armed conflict, illegal mining, human rights abuses, and harmful environmental practices. Recycling batteries and formulating cathodes with a reduced concentration of cobalt could help lower the dependence on such problematic foreign sources and raise the security of the supply chain.
3.Practices of Recycling Lithium-ion Batteries
A Li battery cell has a metal cathode, or positive electrode that collects electrons during the electrochemical reaction, made of lithium and some mix of elements that typically include cobalt, nickel, manganese and iron. It also has an anode, or the electrode that releases electrons to the external circuit, made of graphite, a separator and an electrolyte of some kind, which is the medium that transports the electrons between cathode and anode. The lithium ions travelling from the anode to the cathode form an electric current. The metals in the cathode are the most valuable parts of the battery. Besides, lithium battery crushing and sorting Equipment separates and regenerates waste lithium batteries by separating them into the raw materials we need. Lithium battery recycling and processing equipment crushes and crushes the raw materials with multi-knife crushing, and separates and processes them by airflow sorting facilities, with pulse dust removal facilities to collect the dust generated during the separation process and subsequent processes. Form the whole life cycle of the battery green, high quality closed-circuit recycling system, lithium battery crushing and recycling equipment is mainly used in the end-of-life lithium battery positive and negative pieces of aluminum berth, copper berth and positive and negative materials for separation and processing, in order to recycle, with the industry development environment optimization, lithium battery resource utilization of the development prospects are considerable.
In addition to this, lithium-ion batteries can be recycled by the following three methods. At present, disassembly is a particularly important method, generally wet recycling, dry recycling, biological recycling, etc. Wet recycling is one of the particularly large number of applications and high commercialization. Lithium raw materials improve, recycling used batteries to obtain reusable materials, is an important way for manufacturers to reduce costs.
The original high-performance lithium-ion batteries as energy storage batteries using gradient utilization, and high-performance lithium-ion batteries recycling costs than ordinary batteries, and to the consistency of the battery is more demanding, this method is trying to run, and is not perfect.
Lithium recycling equipment mainly adopts physical recycling method, supplemented by three-waste disposal measures, which has the characteristics of green low-carbon, energy saving, no secondary pollution, etc. The whole recycling process is fully automated industrially, with high recycling efficiency and strong processing capacity, the recycling and utilization efficiency of lithium-ion batteries is high, with strong processing capacity, and the recycling and utilization of valuable components reaches more than 99%.
Under vacuum, the battery is sent into the electrolyte collection device to maintain the dew point state; when the electrolyte in the electrolyte collection cell is punctured and a drain hole is formed, the electrolyte in the battery flows out from the drain hole and directly into the electrolyte collection cell; after the electrolyte naturally flows out for 30~60minh, the electrolyte in the electrolyte collection cell is added into the nitrogen-protected reaction kettle, and then the electrolyte in the electrolyte collection cell is added into the nitrogen protected reaction kettle, and then the electrolyte in the electrolyte collection cell is added into the nitrogen protected reaction kettle, and then the concentration of 30-50% is added into the nitrogen protected reaction kettle. After that, the electrolyte in the electrolyte collection tank will be added into the reaction kettle protected by nitrogen gas, and then the barium oxide ethanol solution with a concentration of 30-50% will be added to the reaction kettle for recirculation.
Conclusion
In summary, all the recovery processes discussed above are aimed at recovering the resources in spent lithium batteries. However, the recovery processes are not at the same stage of development due to technical difficulties and economic benefits. In addition, since the recycling of lithium batteries is still in its infancy, the current level of research and industrial development is not yet able to realize the perfect recycling of safe, low-cost, low-energy and non-pollution. Therefore, further research and investment are inevitable. However, we believe that with the continuous development of technology, lithium-ion batteries will definitely achieve recycling and reuse.