CN110203949B - Method for fully recycling electrolyte of waste lithium ion battery - Google Patents
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
- C01B25/325—Preparation by double decomposition
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- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
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- C01D15/08—Carbonates; Bicarbonates
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Abstract
The invention provides a method for completely recovering waste lithium ion battery electrolyte, which aims to recover valuable lithium salt, organic solvent and additive in the waste electrolyte and recover harmful impurities such as fluorine, phosphorus and the like after harmless treatment. The invention is characterized in that the lithium salt is finally recovered in the form of lithium carbonate through the procedures of cleaning, cleaning solvent recovery, organic solvent and additive recovery, fluorine and phosphorus recovery and lithium salt recovery, the organic solvent and the additive are separated, purified and recycled, and fluorine and phosphorus are recovered and recycled in the form of precipitates. The process is simple, the method is feasible, the waste electrolyte is fully recycled, the environment is not polluted, all components of the waste electrolyte are recycled by the process, the recovery rate is over 95 percent, and the method is suitable for large-scale industrial application.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a method for completely recovering electrolyte of a waste lithium ion battery.
Background
With the global energy crisis and the aggravation of environmental pollution, the development and application of new energy are imperative. Lithium ion batteries have been rapidly developed since commercialization in the 90 s of the 20 th century. Compared with the traditional chemical battery, the battery has the advantages of light weight, small volume, high voltage, high specific energy, wide working temperature range, high specific power, stable discharge, long storage time, no memory effect, no pollution and the like. At present, lithium ion batteries have been widely used in portable electronic products such as mobile phones, digital cameras, notebook computers, and the like, and have shown wide application prospects in Electric Vehicles (EV), Hybrid Electric Vehicles (HEV), and energy storage systems, and are known as "green secondary batteries in the 21 st century". According to the forecast of the China automobile technology research center, the accumulated scrappage of the power battery of the electric automobile reaches 12-17 ten thousand tons in 2020, and serious environmental pollution is caused if the power battery is not properly treated. At present, the recovery of waste lithium ion batteries is mainly focused on anode and cathode materials and current collectors, and the research on the recovery of electrolyte is few. The electrolyte generally comprises lithium salt, an organic solvent and an additive, wherein the lithium salt is mainly lithium hexafluorophosphate, the organic solvent mainly comprises a carbonate solvent, and the additive content is low. The existence of lithium hexafluorophosphate enables the electrolyte to be in contact with the external environment for reaction, a large amount of pollutants are generated, and important influence is brought to the safety of people and the environmental problem. Meanwhile, the electrolyte has high added value, and how to reasonably recover the electrolyte is a problem worthy of deep research.
The existing recovery methods of lithium ion battery electrolyte comprise an alkali liquor absorption method, a vacuum distillation method and an extraction method. Patent CN 108666644A adopts Ca (OH)2Reaction with spent electrolyte of lithium ion battery, Ca2+React with fluoride ions in the electrolyte to generate CaF2And then, a multi-stage manganese fiber adsorption column and a titanium fiber adsorption column are adopted to carry out physical directional adsorption on lithium ions, so that fluorine and lithium in the electrolyte are recovered, the fluorine and lithium can be recycled, and the environmental pollution can be reduced. Although the method can reduce the pollution of fluorine to the environment and recover lithium resources, the method does not recover the carbonate organic solvent and the additive in the electrolyte and directly adds Ca (OH) into the waste electrolyte2The solution can destroy the organic solvent and the additive, and cause resource waste. Patent CN 109292746A mixes old and useless lithium cell book core with organic solvent, enables the positive negative pole material and the diaphragm of battery and organic solvent fully to contact, then under the ultrasonic action, transfers the lithium hexafluorophosphate that adheres in positive negative pole material, diaphragm and electrolyte to the mixed organic solvent of acetonitrile and carbonic ester, and then realizes that the high efficiency of lithium hexafluorophosphate returnsAnd (6) harvesting. Although the method can effectively recover the lithium hexafluorophosphate, the lithium hexafluorophosphate is unstable and easy to decompose, has high requirements on the breaking-in and enrichment processes, and increases the process cost.
At present, the treatment of the waste lithium ion battery electrolyte in the industry is calcination cracking treatment after heating evaporation, the cracking of an organic solvent needs high-temperature calcination treatment and energy consumption, ethylene carbonate, propylene carbonate, an additive and the like contained in the electrolyte have higher values, and the direct calcination is contrary to the strategy of sustainable development advocated by the state. Therefore, how to efficiently and feasibly recover lithium salt, fluorine and phosphorus in the waste electrolyte for recycling after harmless treatment, and not to damage the structures of the organic solvent and the additive is a difficult problem facing the lithium ion battery industry.
Disclosure of Invention
The invention provides a method for fully recovering waste lithium ion battery electrolyte, lithium salt is finally recovered in the form of lithium carbonate, an organic solvent and an additive are separated, purified and recycled, fluorine and phosphorus are recovered and utilized in the form of precipitates, the process is simple and feasible, the waste electrolyte is fully recovered and utilized, no pollution is caused to the environment, all components of the waste electrolyte are recovered by the process, the recovery rate reaches over 95 percent, and the method is suitable for large-scale industrial application.
The technical scheme for realizing the invention is as follows:
a method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) a cleaning procedure: soaking a waste lithium ion battery containing waste electrolyte in a cleaning solvent, and carrying out ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) a cleaning solvent recovery step: carrying out reduced pressure distillation on the filtrate obtained after the filtration in the step (1), and collecting electrolyte;
(3) organic solvent and additive recovery process: adding water into the electrolyte collected in the step (2), heating, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a separation device, and recovering an organic solvent and an additive;
(4) a lithium salt recovery step: and (4) adding the lithium salt precipitate obtained in the step (3) into a calcium hydroxide solution, and filtering to obtain a filtrate I.
The cleaning solvent in the step (1) is one or more of dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and propylene carbonate.
The vacuum degree of the reduced pressure distillation in the step (2) is 100-500 mbar, and the temperature is 30-100 ℃.
The heating temperature in the step (3) is 30-100 ℃.
The separation device in the step (3) is a rectifying tower, the number of tower plates of the rectifying tower is 5-80, the reflux ratio is 2-60, the reaction temperature is 50-250 ℃, and the operation pressure is 10-80 KPa.
And (4) absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, absorbing the water phase by using the calcium hydroxide solution, recovering fluorine and phosphorus, and filtering to obtain a filtrate II.
And introducing water-soluble carbonate or carbon dioxide into the filtrate I and the filtrate II to generate lithium carbonate to be separated out, wherein the carbonate is one or more of sodium carbonate, potassium carbonate and ammonium carbonate.
The invention has the beneficial effects that: compared with the prior art, the method has the advantages of simple process, high feasibility and no pollution while recovering the lithium salt, the organic solvent, the additive, the fluorine and the phosphorus. The invention plays a positive role in saving resources, protecting environment and realizing sustainable development.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a full recovery process of waste lithium ion battery electrolyte.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a dimethyl carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 100mbar and the temperature to be 30 ℃ to carry out reduced pressure distillation, recovering the dimethyl carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 30 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 40, the reaction temperature is 150 ℃, the operating pressure is 20KPa, the reflux ratio is 5, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
Adding the lithium salt precipitate obtained in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, adding a sodium carbonate solution into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
Example 2
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a methyl ethyl carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 500mbar and the temperature to be 100 ℃, carrying out reduced pressure distillation, recovering the methyl ethyl carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 100 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 80, the reaction temperature is 250 ℃, the operating pressure is 80KPa, the reflux ratio is 60, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
And (3) adding the lithium salt precipitate in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, adding a potassium carbonate solution into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
Example 3
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a diethyl carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 200mbar and the temperature to be 50 ℃ to carry out reduced pressure distillation, recovering the diethyl carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 50 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 5, the reaction temperature is 50 ℃, the operating pressure is 10KPa, the reflux ratio is 2, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
And (3) adding the lithium salt precipitate in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, adding an ammonium carbonate solution into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
Example 4
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
The method comprises the steps of soaking a waste lithium ion battery containing waste electrolyte in a propylene carbonate solvent, and extracting the electrolyte after carrying out ultrasonic treatment, stirring and filtering on the waste lithium ion battery.
(2) Cleaning solvent recovery step
Controlling the vacuum degree to be 400mbar and the temperature to be 80 ℃ to carry out reduced pressure distillation, recovering the propylene carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 60 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 20, the reaction temperature is 100 ℃, the operating pressure is 30KPa, the reflux ratio is 20, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
And (3) adding the lithium salt precipitate in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, introducing carbon dioxide gas into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
Example 5
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a methyl ethyl carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 300mbar and the temperature to be 60 ℃ to carry out reduced pressure distillation, recovering the methyl ethyl carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 50 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 30, the reaction temperature is 150 ℃, the operating pressure is 40KPa, the reflux ratio is 30, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
And (3) adding acetic acid into the lithium salt precipitate in the step (3) to form a filtrate, separating and removing the precipitate formed in the step (4) to obtain a filtrate, putting the obtained filtrate into a crystallization kettle, introducing carbon dioxide gas into the crystallization kettle, heating, concentrating and crystallizing to obtain the lithium carbonate.
Example 6
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a dimethyl carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 400mbar and the temperature to be 80 ℃ to carry out reduced pressure distillation, recovering the dimethyl carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 70 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 40, the reaction temperature is 180 ℃, the operating pressure is 50KPa, the reflux ratio is 40, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
And (3) adding the lithium salt precipitate in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, adding a potassium carbonate solution into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
Example 7
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a propylene carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 200mbar and the temperature to be 50 ℃ to carry out reduced pressure distillation, recovering the propylene carbonate solvent used in the working procedure (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding excessive water into the collected electrolyte in the step (2), heating at 80 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating the organic phase one by one through a rectifying tower, wherein the tower plate number of the rectifying tower is 80, the reaction temperature is 220 ℃, the operating pressure is 60KPa, the reflux ratio is 50, and recovering the organic solvent and the additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
Adding the lithium salt precipitate obtained in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, adding a sodium carbonate solution into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
Example 8
A method for fully recovering electrolyte of a waste lithium ion battery comprises the following steps:
(1) cleaning process
Soaking a waste lithium ion battery containing waste electrolyte in a diethyl carbonate solvent, and extracting the electrolyte after performing ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) cleaning solvent recovery step
Controlling the vacuum degree to be 100mbar and the temperature to be 40 ℃ to carry out reduced pressure distillation, recovering the diethyl carbonate solvent used in the step (1), and collecting the electrolyte;
(3) organic solvent and additive recovery step
Adding water into the collected electrolyte in the step (2), heating at 40 ℃, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a rectifying tower, wherein the number of tower plates of the rectifying tower is 50, the reaction temperature is 240 ℃, the operating pressure is 60KPa, the reflux ratio is 15, and recovering an organic solvent and an additive;
(4) recovery process of fluorine and phosphorus in electrolyte
Absorbing the volatile gas generated by heating in the step (3) by using a calcium hydroxide solution, and absorbing the aqueous phase in the step (3) by using the calcium hydroxide solution to generate calcium fluoride and calcium phosphate and then recovering the calcium fluoride and the calcium phosphate;
(5) lithium salt recovery step
And (3) adding the lithium salt precipitate in the step (3) into a calcium hydroxide solution, filtering to obtain a filtrate I, reacting the aqueous phase with the calcium hydroxide solution in the step (4), filtering to obtain a filtrate II, putting the obtained filtrates I and II into a crystallization kettle, introducing carbon dioxide gas into the crystallization kettle, heating, concentrating and crystallizing to generate lithium carbonate.
TABLE 1 recovery of various components of spent electrolyte
Verification of effects
Table 1 shows the recovery rates of the components of the spent electrolyte in the examples.
Fig. 1 is a process flow diagram for the total recovery of the electrolyte of the waste lithium ion battery, and the effective recovery of lithium salt, organic solvent, additive, fluorine and phosphorus can be clearly seen from the diagram.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A full recovery method of waste lithium ion battery electrolyte is characterized by comprising the following steps:
(1) a cleaning procedure: soaking a waste lithium ion battery containing waste electrolyte in a cleaning solvent, and carrying out ultrasonic treatment, stirring and filtering on the waste lithium ion battery;
(2) a cleaning solvent recovery step: carrying out reduced pressure distillation on the filtrate obtained after the filtration in the step (1), and collecting electrolyte;
(3) organic solvent and additive recovery process: adding water into the electrolyte collected in the step (2), heating, filtering to obtain lithium salt precipitate and filtrate, introducing the filtrate into an extraction tower, purifying and separating organic phases one by one through a separation device, and recovering an organic solvent and an additive; absorbing volatile gas generated by heating with a calcium hydroxide solution, absorbing the water phase with the calcium hydroxide solution, recovering fluorine and phosphorus, and filtering to obtain a filtrate II; the separation device in the step (3) is a rectifying tower, the number of tower plates of the rectifying tower is 5-80, the reflux ratio is 2-60, the reaction temperature is 50-250 ℃, and the operation pressure is 5-80 Kpa;
(4) a lithium salt recovery step: adding the lithium salt precipitate obtained in the step (3) into a calcium hydroxide solution, and filtering to obtain a filtrate I;
(5) and introducing water-soluble carbonate or carbon dioxide into the filtrate I and the filtrate II to generate lithium carbonate to be separated out, wherein the carbonate is one or more of sodium carbonate, potassium carbonate and ammonium carbonate.
2. The method for fully recycling the electrolyte of the waste lithium ion battery according to claim 1, characterized by comprising the following steps: the cleaning solvent in the step (1) is one or more of dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and propylene carbonate.
3. The method for fully recycling the electrolyte of the waste lithium ion battery according to claim 1, characterized by comprising the following steps: the vacuum degree of the reduced pressure distillation in the step (2) is 100-500 mbar, and the temperature is 30-100 ℃.
4. The method for fully recycling the electrolyte of the waste lithium ion battery according to claim 1, characterized by comprising the following steps: the heating temperature in the step (3) is 30-100 ℃.
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| CN114914570B (en) * | 2022-05-20 | 2023-03-24 | 广州天赐高新材料股份有限公司 | Method and device for recycling electrolyte of waste lithium ion battery |
| CN114759286A (en) * | 2022-05-30 | 2022-07-15 | 清华大学深圳国际研究生院 | Method for recovering waste electrolyte of lithium ion battery |
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Effective date of registration: 20230720 Address after: Room 1125, 10th Floor, Building 1, No. 6 Danling Street, Haidian District, Beijing 100086 Patentee after: Zhongke Xingfa Medical Technology Co.,Ltd. Address before: 10 / F, block a, Newton international, Yangjin Road, Jinshui District, Zhengzhou City, Henan Province Patentee before: ZHENGZHOU INSTITUTE OF EMERGING INDUSTRIAL TECHNOLOGY Patentee before: Institute of Process Engineering, Chinese Academy of Sciences |