CN105304966A - Environment-friendly recycling method for lithium-ion battery - Google Patents
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Abstract
本发明公开了一种锂离子电池的环保回收方法，所述方法是将锂离子电池的外壳去除后的锂离子电池芯放入到高温液体中，通过高温液体的加热作用使其中的隔膜分解为气和/或油排出，使正极材料从正极的正极集流体上脱离下来，负极材料从负极的负极集流体上脱离下来；然后将高温液体溶于水中，过滤得到正极集流体、负极集流体、正极材料和负极材料的混合物滤饼；对混合物滤饼进行进一步分离，可分别得到正极材料、正极集流体和负极集流体。本发明方法具有分离效率高、工艺简单、环保、成本低等优点，可解决废弃锂离子电池的污染和资源化问题。
The invention discloses an environment-friendly recycling method for lithium ion batteries. The method is to put the lithium ion battery core after removing the shell of the lithium ion battery into a high-temperature liquid, and decompose the diaphragm therein into The gas and/or oil are discharged, so that the positive electrode material is separated from the positive electrode current collector of the positive electrode, and the negative electrode material is separated from the negative electrode current collector of the negative electrode; then the high temperature liquid is dissolved in water, and the positive electrode current collector, negative electrode current collector, The mixture filter cake of positive electrode material and negative electrode material; the mixture filter cake can be further separated to obtain positive electrode material, positive electrode current collector and negative electrode current collector respectively. The method of the invention has the advantages of high separation efficiency, simple process, environmental protection, low cost, etc., and can solve the problems of pollution and recycling of waste lithium ion batteries.
Description
技术领域technical field
本发明涉及一种电池的回收方法，具体说，是涉及一种锂离子电池的环保回收方法。The invention relates to a battery recycling method, in particular to an environmentally friendly recycling method for lithium ion batteries.
背景技术Background technique
现在由于电子产品的报废越来越多，用于电子产品的锂离子电池的报废量也越来越大，如何环保回收锂离子电池也越来越重要。现有技术中已有关于锂离子电池的相关回收技术，如：中国专利申请CN01130735.8、发明名称为《从废锂离子电池中回收金属的方法》的发明中公开了一种回收方法，该发明虽然也能达到回收其中金属的目的，但在回收过程中采用了高温炉焙烧，并且还采用了加入酸溶蚀的手段，回收过程中不仅产生了新的环境污染，而且成本高、工艺复杂，不适合规模化回收要求！因此，研发一种效率高、无污染、成本低的关于锂离子电池的环保回收方法，将对解决废弃锂离子电池的污染和资源化问题具有重要价值和社会意义。Nowadays, as more and more electronic products are scrapped, the amount of scrapped lithium-ion batteries used in electronic products is also increasing. How to recycle lithium-ion batteries in an environmentally friendly manner is becoming more and more important. In the prior art, there are related recycling technologies about lithium-ion batteries, such as: Chinese patent application CN01130735.8, the invention titled "Method for recovering metals from waste lithium-ion batteries" discloses a recycling method, which Although the invention can also achieve the purpose of recovering the metals in it, high-temperature furnace roasting is used in the recovery process, and the means of adding acid to dissolve is also used. In the recovery process, not only new environmental pollution is produced, but also the cost is high and the process is complicated. Not suitable for large-scale recycling requirements! Therefore, developing an environmentally friendly recycling method for lithium-ion batteries with high efficiency, no pollution, and low cost will have important value and social significance for solving the pollution and recycling of waste lithium-ion batteries.
发明内容Contents of the invention
本发明的目的在于克服现有技术的缺陷，提供一种分离效率高、工艺简单、无污染、成本低的锂离子电池的环保回收方法。The purpose of the present invention is to overcome the defects of the prior art and provide an environmentally friendly recycling method for lithium ion batteries with high separation efficiency, simple process, no pollution and low cost.
为实现上述目的，本发明采用如下技术方案：To achieve the above object, the present invention adopts the following technical solutions:
一种锂离子电池的环保回收方法，所述锂离子电池包括锂离子电池外壳和锂离子电池芯，所述的锂离子电池芯包括正极、负极和隔膜，所述正极包括正极材料和正极集流体，所述负极包括负极材料和负极集流体；所述方法是将锂离子电池的外壳去除后的锂离子电池芯放入到高温液体中，通过高温液体的加热作用使其中的隔膜分解为气和/或油排出，并通过高温液体的加热作用使正极材料从正极的正极集流体上脱离下来，使负极材料从负极的负极集流体上脱离下来；然后将含有正极集流体、正极材料、负极集流体和负极材料的高温液体溶于水中，过滤得到正极集流体和负极集流体及正极材料和负极材料的混合物滤饼，或过滤得到正极集流体和负极集流体的混合物滤饼及正极材料和负极材料与高温液体的混合滤液；所述高温液体的温度不低于隔膜的分解温度。An environmentally friendly recycling method for a lithium-ion battery, the lithium-ion battery includes a lithium-ion battery casing and a lithium-ion battery core, the lithium-ion battery core includes a positive electrode, a negative electrode and a diaphragm, and the positive electrode includes a positive electrode material and a positive electrode current collector , the negative electrode includes a negative electrode material and a negative electrode current collector; the method is to put the lithium ion battery core after removing the shell of the lithium ion battery into a high-temperature liquid, and decompose the diaphragm therein into gas and /or the oil is discharged, and the positive electrode material is separated from the positive electrode current collector of the positive electrode by the heating of the high-temperature liquid, and the negative electrode material is separated from the negative electrode current collector of the negative electrode; then the positive electrode current collector, positive electrode material, negative electrode collector The high-temperature liquid of the fluid and the negative electrode material is dissolved in water, and the mixture filter cake of the positive electrode current collector and the negative electrode current collector and the positive electrode material and the negative electrode material is obtained by filtration, or the mixture filter cake of the positive electrode current collector and the negative electrode current collector, the positive electrode material and the negative electrode are obtained by filtration The mixed filtrate of the material and the high-temperature liquid; the temperature of the high-temperature liquid is not lower than the decomposition temperature of the diaphragm.
本发明所述的锂离子电池的环保回收方法还具有如下改进：The environmental protection recovery method of lithium ion battery of the present invention also has following improvement:
1、在盛放高温液体的容器上方设置有气和/或油的回收装置。1. A gas and/or oil recovery device is installed above the container holding the high temperature liquid.
2、在盛放高温液体的容器中设置有隔离网。2. An isolation net is installed in the container holding the high-temperature liquid.
3、当正极集流体为铝箔、负极集流为铜箔时，所述高温液体的温度介于铝的熔点与铜的熔点之间。3. When the positive current collector is aluminum foil and the negative current collector is copper foil, the temperature of the high-temperature liquid is between the melting point of aluminum and the melting point of copper.
4、对高温液体的加热分步进行，首先使其温度达到隔膜分解温度至450度之间；待隔膜完全分解后再升温至铝的熔点与铜的熔点之间。4. The high-temperature liquid is heated step by step. Firstly, the temperature reaches between the decomposition temperature of the diaphragm and 450 degrees. After the diaphragm is completely decomposed, the temperature is raised to between the melting point of aluminum and the melting point of copper.
5、所述高温液体为熔融盐。5. The high-temperature liquid is molten salt.
6、所述高温液体与正极集流体、正极材料、负极集流体和负极材料之间均不发生化学反应。6. There is no chemical reaction between the high-temperature liquid and the positive electrode current collector, positive electrode material, negative electrode current collector and negative electrode material.
7、对过滤得到的正极材料和负极材料与高温液体的混合滤液进行二次过滤，使正极材料和负极材料从混合滤液中分离出。7. Perform secondary filtration on the mixed filtrate of the filtered positive electrode material, negative electrode material and high-temperature liquid, so that the positive electrode material and negative electrode material are separated from the mixed filtrate.
8、当得到的正极集流体和负极集流体的混合物为铜和铝的混合物时，利用两者间的熔点差异或比重差异进行分离处理。8. When the mixture of the positive current collector and the negative current collector is a mixture of copper and aluminum, use the difference in melting point or specific gravity between the two to carry out separation treatment.
9、当分离出的正极材料与负极材料的混合物为锂盐与石墨粉的混合物时，通过加热使石墨粉发生氧化挥发以分离得到锂盐。9. When the mixture of the separated positive electrode material and negative electrode material is a mixture of lithium salt and graphite powder, the graphite powder is oxidized and volatilized by heating to separate and obtain lithium salt.
与现有技术相比，本发明具有如下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1、环保：在回收过程中，没有废水、废气及废渣产生。1. Environmental protection: In the recycling process, no waste water, waste gas and waste residue are produced.
2、资源化：对其中的正极集流体、负极集流体、正极材料、隔膜都进行了回收利用。2. Recycling: The positive electrode current collector, negative electrode current collector, positive electrode material, and diaphragm are all recycled.
3、成本低：由于在整个回收过程中没有加入和消耗任何化学药品，回收成本低。3. Low cost: Since no chemicals are added and consumed during the entire recycling process, the recycling cost is low.
附图说明Description of drawings
图1是实施例1提供的一种对锂离子电池进行环保回收的工艺流程图。FIG. 1 is a flow chart of a process for environmentally friendly recycling of lithium-ion batteries provided in Example 1.
图2是实施例2提供的另一种对锂离子电池进行环保回收的工艺流程图。FIG. 2 is another process flow diagram for environmentally friendly recovery of lithium-ion batteries provided in Example 2.
具体实施方式detailed description
下面结合实施例和附图对本发明的技术方案作进一步详细阐述：Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is described in further detail:
本发明提供的一种锂离子电池的环保回收方法，包括如下步骤：A kind of environmental protection recovery method of lithium ion battery provided by the invention comprises the following steps:
将锂离子电池的外壳去除后的锂离子电池芯放入到高温液体中，通过高温液体的加热作用使其中的隔膜分解为气和/或油排出，并通过高温液体的加热作用使正极材料从正极的正极集流体上脱离下来，使负极材料从负极的负极集流体上脱离下来；然后将含有正极集流体、正极材料、负极集流体和负极材料的高温液体溶于水中，过滤得到正极集流体和负极集流体及正极材料和负极材料的混合物滤饼，或过滤得到正极集流体和负极集流体的混合物滤饼及正极材料和负极材料与高温液体的混合滤液；所述高温液体的温度不低于隔膜的分解温度。Put the lithium-ion battery core after removing the shell of the lithium-ion battery into the high-temperature liquid, decompose the diaphragm into gas and/or oil through the heating of the high-temperature liquid, and make the positive electrode material from the The positive electrode current collector of the positive electrode is separated from the negative electrode current collector of the negative electrode; then the high temperature liquid containing the positive electrode current collector, positive electrode material, negative electrode current collector and negative electrode material is dissolved in water, and the positive electrode current collector is obtained by filtration and the mixture filter cake of the negative electrode current collector and the positive electrode material and the negative electrode material, or obtain the mixed filtrate of the mixture filter cake of the positive electrode current collector and the negative electrode current collector, the positive electrode material, the negative electrode material and the high temperature liquid by filtration; the temperature of the high temperature liquid is not low at the decomposition temperature of the membrane.
当过滤得到正极材料、正极集流体、负极材料和负极集流体的混合物时，对混合物进行清洗烘干处理后，由于正极材料和负极材料呈粉状而正极集流体和负极集流体呈颗粒或块状，因而可以通过调整筛网的网孔大小，采用筛分方法将正极材料和负极材料与正极集流体和负极集流体分离，得到含正极材料和负极材料的混合物与正极集流体和负极集流体的混合物。当然也可以通过其它方式，如：利用比重差异采用风选等方法进行分离。When the mixture of positive electrode material, positive electrode current collector, negative electrode material and negative electrode current collector is obtained by filtration, after the mixture is cleaned and dried, the positive electrode current collector and negative electrode current collector are in the form of particles or blocks due to the powdery state of the positive electrode material and negative electrode material. Therefore, by adjusting the mesh size of the screen, the positive electrode material and the negative electrode material can be separated from the positive electrode current collector and the negative electrode current collector by using a sieving method to obtain a mixture containing the positive electrode material and the negative electrode material and the positive electrode current collector and the negative electrode current collector. mixture. Of course, it can also be separated by other methods, such as: utilizing the difference in specific gravity and adopting winnowing and other methods to separate.
当过滤得到正极集流体和负极集流体的混合物滤饼及正极材料和负极材料与高温液体的混合滤液时，可进行二次过滤，使正极材料和负极材料从混合滤液中分离出，再对过滤得到的正极材料和负极材料的混合物滤饼进行清洗烘干处理，即得到正极材料和负极材料的混合物；对含高温液体的滤液进行蒸发回收高温液体。When the mixture filter cake of positive electrode current collector and negative electrode current collector and the mixed filtrate of positive electrode material, negative electrode material and high temperature liquid are obtained by filtration, secondary filtration can be performed to separate positive electrode material and negative electrode material from the mixed filtrate, and then filter The obtained mixture filter cake of the positive electrode material and the negative electrode material is washed and dried to obtain the mixture of the positive electrode material and the negative electrode material; the filtrate containing the high temperature liquid is evaporated to recover the high temperature liquid.
本发明所述的锂离子电池的环保回收方法还具有如下改进：The environmental protection recovery method of lithium ion battery of the present invention also has following improvement:
1、在盛放高温液体的容器上方设置有气和/或油的回收装置，通过回收装置可以防止分解产生的气和/或油排入到空气中造成空气污染，同时还可以回收利用，形成环保、资源化回收。1. A gas and/or oil recovery device is installed above the container holding the high-temperature liquid. Through the recovery device, the gas and/or oil generated by decomposition can be prevented from being discharged into the air to cause air pollution. At the same time, it can be recycled and used to form Environmental protection, recycling of resources.
2、当正极集流体为铝箔、负极集流体为铜箔时，所述高温液体的温度介于铝的熔点与铜的熔点之间。当所述高温液体的温度高于铝的熔点时，铝箔就会熔化成颗粒状铝，容易与铜箔进行分离。2. When the positive current collector is aluminum foil and the negative current collector is copper foil, the temperature of the high-temperature liquid is between the melting point of aluminum and the melting point of copper. When the temperature of the high-temperature liquid is higher than the melting point of aluminum, the aluminum foil will melt into granular aluminum, which is easy to separate from the copper foil.
3、在盛放高温液体的容器中设置有隔离网，隔离网可以让钴酸锂粉和颗粒状铝从中漏下，而将铜箔拦住；当将隔离网从高温液体中拿出时，就可以实现铜的分离。3. There is an isolation net in the container containing the high-temperature liquid, which can allow the lithium cobalt oxide powder and granular aluminum to leak from it, and block the copper foil; when the isolation net is taken out of the high-temperature liquid, it will Separation of copper can be achieved.
4、对高温液体的加热分步进行，首先使其温度达到隔膜分解温度至450度之间；待隔膜完全分解后再升温至铝的熔点与铜的熔点之间。采用分步加热可以提高隔膜分解成油的比例，提高经济价值。4. The high-temperature liquid is heated step by step. Firstly, the temperature reaches between the decomposition temperature of the diaphragm and 450 degrees. After the diaphragm is completely decomposed, the temperature is raised to between the melting point of aluminum and the melting point of copper. The step-by-step heating can increase the ratio of the diaphragm to be decomposed into oil and improve the economic value.
5、所述高温液体为熔融盐。因为熔融盐可以耐高温，成本低。如当高温液体是氯化盐，如：氯化钠和/或氯化钾的混合物时，具有成本低、容易回收优点。5. The high-temperature liquid is molten salt. Because molten salt can withstand high temperature, the cost is low. For example, when the high-temperature liquid is a chloride salt, such as a mixture of sodium chloride and/or potassium chloride, it has the advantages of low cost and easy recovery.
6、所述高温液体与正极材料、正极集流体、负极材料和负极集流体之间均不发生化学反应。现在的正极集流体通常采用铝箔、负极集流体采用铜箔，如果发生化学反应铜箔就会生成铜盐，而将铜盐转化成金属铜又会增加回收成本。而铝箔如果发生化学反应将变成没有经济价值的铝盐，排放还会污染环境。正极材料如钴酸锂如果与高温液体发生化学反应就不能直接得到钴酸锂，从而会降低其经济价值。6. There is no chemical reaction between the high-temperature liquid and the positive electrode material, the positive electrode current collector, the negative electrode material and the negative electrode current collector. Current positive electrode current collectors usually use aluminum foil, and negative electrode current collectors use copper foil. If a chemical reaction occurs, copper foil will generate copper salts, and converting copper salts into metallic copper will increase the recycling cost. However, if the aluminum foil undergoes a chemical reaction, it will become an aluminum salt with no economic value, and the discharge will pollute the environment. If the cathode material such as lithium cobalt oxide reacts chemically with high-temperature liquid, lithium cobalt oxide cannot be obtained directly, which will reduce its economic value.
7、当得到的正极集流体和负极集流体的混合物为铜和铝的混合物时，可利用两者间的熔点差异或比重差异进行分离处理。如：利用两者的比重差异通过选矿技术进行分离；或，利用两者的熔点差异将铝熔化而铜仍然保持固体状态进行分离。7. When the mixture of the positive electrode current collector and the negative electrode current collector is a mixture of copper and aluminum, the difference in melting point or specific gravity between the two can be used for separation treatment. For example: use the difference in specific gravity between the two to separate through mineral processing technology; or use the difference in melting point to melt aluminum while copper remains in a solid state for separation.
8、当分离出的正极材料和负极材料为锂盐和石墨粉的混合物时，可通过加热使石墨粉发生氧化挥发以分离得到锂盐。因为钴酸锂在900℃时仍然保持稳定，而在同样温度下石墨粉已经碳化，变成二氧化碳气体挥发。当然，如果加入氧气效果会更好。8. When the separated positive electrode material and negative electrode material are a mixture of lithium salt and graphite powder, the graphite powder can be oxidized and volatilized by heating to separate and obtain lithium salt. Because lithium cobalt oxide remains stable at 900°C, while graphite powder has been carbonized at the same temperature and becomes carbon dioxide gas to volatilize. Of course, the effect will be better if oxygen is added.
实施例1Example 1
参照图1，本实施例提供的一种对锂离子电池进行环保回收的工艺流程如下：将拆解废旧锂离子电池所得到的锂离子电池芯投入到高温液体里，高温液体的温度一般控制在400℃～450℃之间；由于隔膜的两面分别粘附有正、负极材料，当隔膜加入到高温液体里时，通过高温液体的加热作用，隔膜分解成了气体和/或油得到回收。继续升高高温液体的温度，使温度高于铝的熔点低于铜的熔点，通过高温液体的进一步加热作用，使其中的正极集流体铝箔熔化，粘附在正极集流体上面的正极材料锂盐如钴酸锂就会脱离正极集流体铝箔进入到高温液体里，同时粘附在负极集流体铜箔上的石墨粉在高温的作用下也脱离进入高温液体里。向高温液体里加入水，通过水的溶解形成水溶液，进行一次过滤，由于正、负极材料是细粉状而正、负极集流体是颗粒状和片状，通过调整过滤网的滤孔大小，让细粉状的正、负极材料通过滤网而正、负极集流体无法通过，得到滤饼和滤液，所得到的滤饼是颗粒状和片状的正、负极集流体。对所得滤液进行二次过滤，得到含正、负极材料的滤饼和滤液，对所得滤液进行蒸发回收高温液体，以循环使用；对含正、负极材料的滤饼进行清洗烘干，得到正、负极材料混合物；对所得正、负极材料混合物进行加热氧化处理，使其中的石墨粉氧化成二氧化碳挥发，即分离得到钴酸锂粉。将含正、负极集流体的滤饼进行清洗烘干，得到正、负极集流体混合物，对所得正、负极集流体混合物进行物理分离，如利用两者之间的比重差异或两者的熔点差异，可分离分别得到金属铝块和金属铜箔。Referring to Fig. 1, a process flow for environmentally friendly recycling of lithium-ion batteries provided in this embodiment is as follows: the lithium-ion battery cores obtained by dismantling waste lithium-ion batteries are put into a high-temperature liquid, and the temperature of the high-temperature liquid is generally controlled at Between 400°C and 450°C; Since the positive and negative electrode materials are adhered to the two sides of the separator, when the separator is added to the high-temperature liquid, the separator is decomposed into gas and/or oil and recovered by the heating of the high-temperature liquid. Continue to increase the temperature of the high-temperature liquid so that the temperature is higher than the melting point of aluminum and lower than the melting point of copper. Through the further heating of the high-temperature liquid, the aluminum foil of the positive electrode current collector is melted, and the positive electrode material lithium salt adhering to the positive electrode current collector For example, lithium cobaltate will break away from the aluminum foil of the positive electrode collector and enter the high-temperature liquid, and at the same time, the graphite powder adhered to the copper foil of the negative electrode collector will also separate from it and enter the high-temperature liquid under the action of high temperature. Add water to the high-temperature liquid, form an aqueous solution through the dissolution of water, and perform a filtration. Since the positive and negative electrode materials are fine powder and the positive and negative electrode current collectors are granular and flake, by adjusting the filter hole size of the filter, let The fine powdery positive and negative electrode materials pass through the filter screen but the positive and negative electrode current collectors cannot pass through to obtain filter cakes and filtrates. The obtained filter cakes are granular and sheet-shaped positive and negative electrode current collectors. The obtained filtrate is filtered twice to obtain filter cake and filtrate containing positive and negative electrode materials, and the obtained filtrate is evaporated to recover high-temperature liquid for recycling; the filter cake containing positive and negative electrode materials is washed and dried to obtain positive and negative electrode materials. Negative electrode material mixture: heat and oxidize the obtained positive and negative electrode material mixture to oxidize the graphite powder into carbon dioxide and volatilize, that is, separate and obtain lithium cobaltate powder. Wash and dry the filter cake containing positive and negative current collectors to obtain a mixture of positive and negative current collectors, and physically separate the resulting mixture of positive and negative current collectors, such as using the difference in specific gravity between the two or the difference in melting point between the two , can be separated to obtain metal aluminum block and metal copper foil respectively.
实施例2Example 2
参照图2，本实施例提供的一种对锂离子电池进行环保回收的工艺流程如下：将拆解废旧锂离子电池所得到的锂离子电池芯投入到高温液体里，由于隔膜的两面分别粘附有正、负极材料，当隔膜加入到高温液体里时，高温液体的温度一般控制在400℃-450℃之间，在这种温度下隔膜分解后所得到的油的回收率最高，通过高温液体的加热作用隔膜分解成了气体和/或油得到回收。继续升高高温液体的温度，使高温液体的温度高于铝的熔点低于铜的熔点。通过高温液体的进一步加热作用，使其中的正极集流体铝箔熔化，粘附在正极集流体上面的正极材料锂盐如钴酸锂就会脱离正极集流体铝箔进入到高温液体里，同时粘附在负极集流体铜箔上的石墨粉在高温的作用下也脱离进入高温液体里。向高温液体里加入水，通过水的溶解形成水溶液，过滤，得到滤饼和滤液，对所得滤液进行蒸发回收高温液体，以循环使用。对所得滤饼进行清洗烘干，然后进行筛分，由于正、负极材料是细粉状，而正、负极集流体是颗粒状和片状，可以通过筛分的方式将两者进行分离，筛分后分别得到细粉状的正、负极材料混合物和颗粒状及片状的正、负极集流体。再对正、负极材料混合物进行加热氧化处理，使其中的石墨粉氧化成二氧化碳挥发，分离得到钴酸锂粉。对正、负极集流体混合物进行物理分离，如利用两者之间的比重差异或两者的熔点差异，将两者进行分离，分别得到金属铝块和金属铜箔。Referring to Fig. 2, a process flow for environmentally friendly recovery of lithium-ion batteries provided by this embodiment is as follows: the lithium-ion battery cores obtained by dismantling waste lithium-ion batteries are put into high-temperature liquid, and since the two sides of the diaphragm are respectively adhered There are positive and negative electrode materials. When the diaphragm is added to the high-temperature liquid, the temperature of the high-temperature liquid is generally controlled between 400°C and 450°C. At this temperature, the oil recovery rate obtained after the diaphragm is decomposed is the highest. Through the high-temperature liquid The heating action of the diaphragm decomposes into gas and/or oil which is recovered. Continue to increase the temperature of the high-temperature liquid so that the temperature of the high-temperature liquid is higher than the melting point of aluminum and lower than the melting point of copper. Through the further heating of the high-temperature liquid, the positive electrode current collector aluminum foil is melted, and the positive electrode material lithium salt such as lithium cobalt oxide adhered to the positive electrode current collector will break away from the positive electrode current collector aluminum foil and enter the high-temperature liquid. The graphite powder on the copper foil of the negative electrode current collector is also detached into the high-temperature liquid under the action of high temperature. Add water to the high-temperature liquid, form an aqueous solution through the dissolution of water, filter to obtain a filter cake and filtrate, and evaporate the obtained filtrate to recover the high-temperature liquid for recycling. The obtained filter cake is cleaned and dried, and then sieved. Since the positive and negative electrode materials are fine powder, and the positive and negative electrode current collectors are granular and flake, the two can be separated by sieving. After separation, the positive and negative electrode material mixtures in fine powder form and the positive and negative electrode current collectors in the form of particles and flakes are respectively obtained. Then heat and oxidize the mixture of positive and negative electrode materials to oxidize the graphite powder into carbon dioxide to volatilize, and separate to obtain lithium cobaltate powder. The positive and negative current collector mixtures are physically separated, such as using the difference in specific gravity or the difference in melting point between the two to separate the two to obtain metal aluminum blocks and metal copper foils respectively.
最后有必要在此说明的是：以上实施例只用于对本发明的技术方案作进一步详细地说明，不能理解为对本发明保护范围的限制，本领域的技术人员根据本发明的上述内容作出的一些非本质的改进和调整均属于本发明的保护范围。Finally, it is necessary to explain here that: the above examples are only used to further describe the technical solutions of the present invention in detail, and cannot be interpreted as limiting the protection scope of the present invention. Non-essential improvements and adjustments all belong to the protection scope of the present invention.
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| WO2018028167A1 (en) * | 2016-08-11 | 2018-02-15 | 天齐锂业股份有限公司 | Recovery method for negative electrode piece of lithium metal battery |
| IT201900012060A1 (en) | 2019-07-17 | 2021-01-17 | Eco Res Srl Gmbh | Process for treating accumulators, batteries and the like and plant for carrying out the process |
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