CN114212786A - Method for preparing high-capacity high-rate graphite by taking waste lithium ion battery cathode material as raw material - Google Patents
Method for preparing high-capacity high-rate graphite by taking waste lithium ion battery cathode material as raw material Download PDFInfo
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Abstract
The invention discloses a method for preparing high-capacity high-rate graphite by taking a waste lithium ion battery cathode material as a raw material, which comprises the following steps of: cutting the negative electrode material into fragments, and then putting the fragments into a furnace for heating to obtain powder; mixing the powder in water, carrying out ultrasonic vibration treatment, and then filtering and drying to obtain residual powder; and screening the residual powder through different mesh screens to obtain copper particles and high-purity graphite, subsequently placing the high-purity graphite into water for ultrasonic dispersion, then adding the water in which the organic glycogen is dissolved, heating in a water bath, stirring and evaporating to dryness, drying, and finally carrying out anaerobic heating carbonization through a tubular furnace to obtain the graphite with better electrochemical performance. The invention provides a method for recycling a lithium ion battery cathode material which has good recycling electrochemical performance and can be used for industrial production.
Description
Technical Field
The invention relates to the field of material recovery, in particular to a method for preparing high-capacity high-rate graphite by taking a waste lithium ion battery cathode material as a raw material.
Background
Lithium ion batteries have been successfully used in various fields such as electric vehicles because of their advantages of large storage capacity, high operating voltage, good cycle performance, etc. It is reported that the number of global electric vehicles is expected to exceed 1.25 million by 2030. Meanwhile, a recycling market of the waste batteries will be formed. In fact, graphite has already dominated lithium ion batteries. The graphite content required for an electric hybrid vehicle and an all-electric vehicle is about 10 kg and 50 kg, respectively. It is therefore necessary to recover graphite from lithium ion batteries. On one hand, with the development of electric automobiles, the demand of battery-grade graphite, particularly battery-grade graphite, is rapidly increased, and the strategic significance of graphite is remarkable. And the price of the negative electrode graphite is 8000-. The recycling of the graphite in the waste lithium has great economic value, and can reduce the consumption of natural graphite ores and reduce the emission of greenhouse gases in the process of mining and processing the natural graphite. On the other hand, graphite in the waste lithium ion battery contains toxic components such as heavy metals and electrolytes. If not effectively disposed of, it can be harmful to the environment. Therefore, under the premise that the recovery technology of the waste lithium ion battery is mature day by day, the recovery of the negative electrode graphite is sustainable in the lithium ion battery industry.
Aiming at the application of the waste graphite, a series of exploration activities are developed. In combination with the characteristics (large specific surface area, high conductivity, etc.) of graphite, studies have been made to successfully reuse waste graphite as an adsorbent or a catalyst. However, the demand for these special functional materials is small, and it is difficult to achieve high utilization of a large amount of graphite in the spent lithium ion battery. The best method is to use waste graphite as the negative electrode material of the lithium ion battery to form a closed cycle. To achieve this goal, two problems need to be solved. Firstly, removing impurities (phosphoric acid, fluorine, heavy metals and organic impurities) and secondly, repairing the structure of the waste graphite. In the last few years, it has been studied to remove impurities by acid leaching and then to repair the structure of graphite at high temperatures. However, the process is complex, both wet and fire processes are available, and a large amount of wastewater is generated. Meanwhile, the acid leaching causes the distance between graphite layers to be enlarged, the surface of the graphite layers to have defects, the graphitization repair energy consumption is high, and the performance of the recycled product is unstable. At present, pure pyrometallurgical processes, with precise atmosphere and temperature control, with simultaneous impurity removal and graphite remediation, are considered to be one of the most promising approaches for waste graphite regeneration. Although the recycled graphite has high cycle performance and reversibility, the coulombic efficiency due to defects is still to be further improved from the practical point of view.
To obtain better ion storage performance, surface modification is proposed to improve coulombic efficiency and rate capability. In addition, there are two main types, i.e., a metal-based coating and a carbon-based coating, according to the kind of the coating. Although the introduction of metal ions can induce high conductivity, the conductivity and coulombic efficiency are difficult to reach the standards of commercial materials, and the cost is high. The other carbon coating material has wider application, and after the amorphous carbon layer is introduced, the carbon defect can be further repaired, so that the carbon coating material has considerable energy storage capacity. For example, it has been studied to apply pitch as a carbon source and tetrahydrofuran as a solvent to a coating layer of natural graphite. And researchers successfully prepare the recycled graphite through the phenolic resin, so that the coulombic efficiency and the specific capacity are obviously improved. Considering the differences in structural and surface properties between waste graphite and natural graphite, new green coating materials should be further explored. Meanwhile, glycogen is rich in storage, and is also suitable for the coating process of waste graphite. Interestingly, due to different glycogen carbon chain lengths, there will be different reparative events for the carbon layer and surface defects.
Disclosure of Invention
In view of the above, the present invention provides a method for recycling coated recycled graphite, which has excellent performance and can be used for directly producing a lithium ion battery negative electrode material, and the method has the advantages of simple operation, low cost, excellent performance and applicability to industrial production.
Based on the above purpose, the method for preparing high-capacity high-rate graphite by using the waste lithium ion battery cathode material as the raw material, provided by the invention, comprises the following steps:
disassembling the lithium ion battery and separating out a negative electrode material;
cutting the negative electrode material into fragments, and putting the fragments into a heating furnace for high-temperature heating to obtain powder;
mixing the powder with deionized water, then carrying out ultrasonic vibration treatment, and filtering and drying the solution after vibration treatment to obtain residual powder;
and screening the residual powder through different mesh screens to obtain high-purity graphite, namely the recovered graphite.
And ultrasonically dispersing the obtained recovered graphite in deionized water, heating the graphite by using a water bath, mixing and stirring the graphite with organic glycogen, and drying the graphite to obtain mixed graphite.
And (3) putting the obtained mixed graphite into a heating furnace for heating and carbonizing to obtain the high-performance coated graphite.
Optionally, the negative electrode material is cut into pieces, the pieces are put into a tube furnace, nitrogen is introduced into the tube furnace, the temperature is increased to 1200-1400 ℃ to volatilize and decompose the binder and other organic solvents, the copper foil is melted, and the pieces are heated for 2-4 hours to obtain powder.
Optionally, the powder is mixed with deionized water and then subjected to ultrasonic vibration treatment for 15-30 minutes, the solution after vibration treatment is filtered through filter paper, and after filtration, the solution is placed into a 60-80 ℃ oven to be dried, so that residual powder is obtained.
Optionally, sieving the residual powder by a 200-mesh sieve to obtain copper particles on the sieve; and sieving the powder obtained by sieving through screens of 300 meshes, 600 meshes and 800 meshes, and taking the graphite between the screens of 600 meshes and 800 meshes to obtain the recovered graphite.
Optionally, the recovered graphite is added into water for ultrasonic dispersion for 10-15 minutes. The ultrasonic frequency is 20-40 kHz.
Optionally, heating the recovered graphite through a water bath at 70-80 ℃, ultrasonically mixing the recovered graphite with the organic glycogen dissolved with different contents, and evaporating to dryness to obtain mixed powder, wherein the mixed powder is preferably mixed with 10% by mass of sucrose. The ultrasonic frequency is 35-40 kHz.
Optionally, the mixed powder is put into a tube furnace and nitrogen is introduced, the temperature is raised to 800-900 ℃ for heating and carbonization, and the coated graphite with different coating layers is formed.
Optionally, the lithium ion battery is a fully discharged lithium ion battery.
Optionally, the lithium ion battery is disassembled in a sodium chloride solution to discharge and is naturally air-dried, and then the lithium ion battery is disassembled to separate out the negative electrode material, the positive electrode material, the diaphragm and the steel shell.
Optionally, the negative electrode material is cut into 1-3cm2Preferably 2cm2Of the chip (a).
Optionally, the heating furnace comprises a tube furnace.
Optionally, the carbon-coated graphite is processed into a negative electrode material, and the negative electrode material is subjected to X-ray diffraction, raman test and button cell electrochemical test.
According to the method for recycling the lithium ion battery cathode material, the capacity retention rate of the button battery prepared from the recycled graphite coated by the method is more than or equal to 99.99% under the condition of constant current charging and discharging 1C, the average coulombic efficiency is higher than 99.5%, and the button battery has good cycle performance.
The button cell prepared from the coating graphite recovered by the method for recovering, coating and utilizing the lithium ion battery cathode material provided by the invention has the 2C capacity of 194.7mAh/g under the condition of multiplying power charge and discharge, and has good multiplying power performance.
According to the method for preparing the high-capacity high-rate graphite by taking the waste lithium ion battery cathode material as the raw material, the waste lithium ion battery cathode is subjected to high-temperature heat treatment, so that the binder and other organic solvents are volatilized and decomposed, other lithium ion compounds and electrolyte are pyrolyzed and volatilized, and the copper foil on the pole piece is melted into copper particles, so that the complex process of separating graphite from the copper foil is omitted, and the goodness and recovery amount of recovered materials are improved. Meanwhile, after the copper foil is melted, the carbon can inhibit the oxidation reaction of the copper foil, so that the purity of the copper is further improved; meanwhile, the recrystallization property of graphite in the high-temperature process is utilized to recover the graphite structure, which provides necessary conditions for obtaining high-quality graphite, and gaps among graphite layers are further opened through ultrasonic cleaning; then, coating the organic carbon by ultrasonic waves to ensure that the organic carbon is uniformly coated as much as possible; thereby achieving the purposes of repairing the surface defects of the recycled graphite and improving the electrochemical performance. According to the invention, the electrochemical performance of the recovered graphite is improved by selectively coating the organic carbon with different carbon chain lengths. The recycling method provided by the invention is simple to operate, low in cost and good in recycling performance.
The invention realizes the recycling of the waste graphite of the lithium ion battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 the present invention for preparing high-capacity high-rate graphite from a waste lithium ion battery cathode material;
FIG. 2 is an X-ray diffraction (X-rd) spectrum of high-capacity high-magnification graphite prepared by using a waste lithium ion battery cathode material as a raw material according to the present invention;
FIG. 3 shows the preparation of the negative electrode material of waste lithium ion battery according to the present invention
FIG. 4 is a scanning electron microscope and a transmission electron microscope image of high-capacity high-magnification graphite prepared by using a waste lithium ion battery cathode material as a raw material according to the present invention;
FIG. 5 is a 100-cycle test chart of a button cell prepared by using high-capacity high-rate graphite prepared from a waste lithium ion battery cathode material as a raw material under the constant-current charging and discharging condition 1C, provided by the invention;
FIG. 6 is a constant current charge-discharge rate test chart of a button cell prepared by using high-capacity high-rate graphite prepared from a waste lithium ion battery cathode material as a raw material according to the present invention;
FIG. 7 is a constant current charge-discharge rate capacity ratio curve diagram of a button cell prepared by using high-capacity high-rate graphite prepared from a waste lithium ion battery cathode material as a raw material according to the present invention;
FIG. 8 is an impedance test chart of a button cell prepared from the recycled graphite and the modified graphite provided by the invention;
FIG. 9 is a diagram showing electrochemical test results of a button cell prepared in comparative example 1 in which the content of the organic glycogen solution is 5% by mass;
FIG. 10 is a diagram showing electrochemical test results of a button cell prepared in comparative example 1 in which the content of the organic glycogen solution is 15% by mass.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
In view of the above, the embodiment of the invention provides a method for preparing high-capacity high-rate graphite by using a waste lithium ion battery negative electrode material as a raw material. As shown in fig. 1, it is a flow chart of the present invention for preparing high-capacity high-rate graphite by using waste lithium ion battery cathode material as raw material; the invention provides a method for preparing high-capacity high-rate graphite by taking a waste lithium ion battery cathode material as a raw material, which comprises the following steps of:
step 101: manually disassembling the lithium ion battery, and separating out a negative electrode material, a positive electrode material, a diaphragm and a steel shell;
step 102: cutting the negative electrode material into 2cm2Weighing 5g of fragments, putting the fragments into a crucible, introducing nitrogen into a tube furnace, and heating the fragments for 4 hours at 1400 ℃ under a vacuum condition, so that the binder and other organic solvents are volatilized and decomposed, and the binder in the negative electrode material is removed; and the copper foil is smelted into copper particles, and other organic impurities and lithiated impurities in the graphite are removed to obtain powder.
Step 103: taking out the powder after cooling to room temperature, mixing the powder with deionized water, and then putting the mixture into an ultrasonic cleaner for ultrasonic vibration treatment for 15 minutes;
step 104: and filtering the solution subjected to vibration treatment by using filter paper, and drying the solution in a 60 ℃ drying oven after filtering to obtain residual powder. Thus, graphite and copper balls remained in the graphite structure can be separated through ultrasonic vibration, and residual phosphorus elements on the surface can be removed through water washing and filtering.
Sieving the remaining powder through different mesh screens, step 105: sieving the dried powder through a 200-mesh screen to obtain copper particles; step 106: sieving the sieved powder by a 300-mesh sieve; step 107: the graphite was sieved through a 600 mesh screen. Step 108: and then, passing the powder passing through the 600-mesh screen through an 800-mesh screen, recovering the graphite which does not pass through the 800-mesh screen, and removing superfine copper powder particles to obtain the high-purity recovered graphite RG.
Step 109: and putting the recovered graphite RG into water for ultrasonic dispersion.
Step 110: mixing 10% by mass of organic glycogen solution with graphite, putting the mixture into a water bath kettle at 80 ℃, heating and stirring the mixture until the water is evaporated to dryness, and then putting the mixture into an oven for drying.
Step 111: and adding the dried powder into a tubular furnace, introducing nitrogen, and heating at 800 ℃ for 1 hour under an anaerobic condition to carbonize organic carbon on the surface to obtain the recovered coated graphite.
Optionally, the lithium ion battery is a fully discharged lithium ion battery.
Optionally, the lithium ion battery is disassembled in a sodium chloride solution for discharging and naturally air-drying, and then the lithium ion battery is disassembled to separate the negative plate, the positive plate, the diaphragm and the steel shell.
Optionally, the organic glycogen solution can be prepared by dissolving glucose (monosaccharide structure), sucrose (disaccharide structure) and starch (polysaccharide structure) in water, and respectively named as RG @ 10% Glu, RG @ 10% Suc and RG @ 10% Sta.
Further, in order to detect that the high-capacity high-magnification graphite prepared by taking the waste lithium ion battery cathode material as the raw material is processed into the cathode material, and X-ray diffraction (X-rd), Raman test (Raman), specific surface area test, scanning, transmission electron microscope (SEM, TEM) and button cell electrochemical test are carried out. The negative electrode material is recycled graphite RG and recycled coated graphite (RG @ 10% Glu, RG @ 10% Suc and RG @ 10% Sta).
As shown in fig. 2, the X-ray diffraction (X-rd) patterns of the recovered graphite and the modified graphite provided by the present invention have distinct graphite peaks and substantially no other impurity peaks, which indicates that the crystal structure of the graphite is not changed during the recovery process, and the 002 crystal face of the coated graphite is shifted to the left, which indicates that the lattice spacing of the graphite is increased due to the intercalation of amorphous carbon.
FIG. 3 is a Raman (Raman) spectrum of the recycled graphite and the modified graphite, and the ratio of ID/IG is gradually increased along with the increase of the number of the sugar structures of the coated sugar source, which shows that the content of the surface amorphous carbon is increased along with the increase of the carbon chain length of the coated carbon source.
As shown in fig. 4 and table 1, the specific surface area test and the micropore diameter test results of the recycled graphite and the modified graphite provided by the present invention show that the specific surface area of the modified graphite is increased while the recycled graphite is repaired, and the average pore diameter is reduced.
TABLE 1
As shown in fig. 5, which is a scanning electron microscope and a transmission electron microscope image of the recycled graphite and the modified graphite provided by the present invention, the recycled graphite has holes on the surface, and the edge layer is exposed obviously, the coated graphite has an amorphous carbon layer on the surface, the interlayer spacing is increased, the edge layer structure is repaired, and the thickness of the carbon layer is related to the length of the coated carbon chain.
Fig. 6 is a 100-cycle test chart, a rate test chart and a rate capacity ratio curve chart of a button battery prepared from the recovered graphite and the modified graphite under the conditions of constant current charge and discharge at 0.2C and 1C; and table 2 shows that the performance of the coated and recycled graphite is obviously improved, and the hundred-circle capacity of the sucrose-coated graphite and the starch-coated graphite is 384.9mAh g and 407.8mAh g under the condition of 0.2C-1Meanwhile, the first-cycle coulombic efficiency and the hundred-cycle discharge capacity are also improved compared with the recycled graphite,the performance of the sucrose-coated graphite is improved most obviously, the coulomb efficiency in the first week is improved to 86.89%, and the capacity of one hundred circles under the 1C condition is kept at 331mAh g-1The reason is that the surface of the recycled graphite is repaired by the amorphous carbon layer with proper thickness, the surface ion diffusion coefficient is increased, and the ion storage capacity under high magnification is increased. Fig. 6(C) shows that the current density returns to 0.1C again, which still has a high retention rate, and proves that the material is electrochemically stable, and the capacity retention rate of the coated graphite is higher at a high rate. Table 3 shows that the sucrose-coated recycled graphite has the highest capacity retention rate under 2C, which is 8% higher than that of the recycled graphite. The sucrose glycogen coating is more suitable for coating the recovered graphite, and the rate capability and the stability of the material are obviously improved.
TABLE 2
Fig. 7 is a test chart of button cell prepared by the recycled graphite and the modified graphite according to the present invention, and the cyclic voltammetry test chart shows that the redox peaks are stable under different sweep rates, and fig. 7(f-h) shows that the sucrose-coated graphite has the highest slope, which corresponds to the material having the optimal ion diffusion rate, even better than commercial graphite.
TABLE 3
Fig. 8 is an impedance test chart of a button cell prepared from the recycled graphite and the modified graphite provided by the invention, and it can be seen that the impedance is enlarged due to the increase of the length of the coated carbon chain, but fig. 8(c) shows that the sucrose-coated graphite has the lowest high-frequency slope and the corresponding low Warburg coefficient, which indicates that the lithium ion diffusion rate is faster.
Comparative example 1
The other conditions were the same as in example 1 except that: the content of the organic glycogen solution is 5% and 15% by mass, and electrochemical test results of the prepared button cell are shown in figures 9 and 10, especially the cycle performance is far worse than that of example 1.
As can be seen from the foregoing embodiments, in the method for preparing high-capacity high-rate graphite from the waste lithium ion battery negative electrode material provided in the embodiments of the present invention, the waste lithium ion battery negative electrode is subjected to high temperature treatment, so that the binder and other organic solvents are volatilized and decomposed, the copper foil on the electrode sheet is melted into copper particles, and other lithium ion compounds and the electrolyte are pyrolyzed and volatilized, thereby improving the quality and recovery amount of the recovered material. Meanwhile, the screen mesh is selected to be finer, so that the recovery efficiency, the purity of the material, the electrochemical performance and the like are improved. And finally, coating and modifying the recovered graphite by organic glycogen to repair holes and exposed surface laminated structures left after use. The recycling method provided by the invention is simple to operate, low in cost, excellent in performance and applicable to industrial production.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alterations, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method for preparing high-capacity high-rate graphite by taking a waste lithium ion battery cathode material as a raw material is characterized by comprising the following steps of:
disassembling the lithium ion battery and separating out a negative electrode material;
cutting the negative electrode material into fragments, and putting the fragments into a heating furnace for oxygen-free high-temperature heating to obtain powder;
mixing the powder with deionized water, then carrying out ultrasonic vibration treatment, and filtering and drying the solution after vibration treatment to obtain residual powder;
and screening the residual powder through different mesh screens to obtain copper particles and graphite.
Ultrasonically dispersing the graphite in deionized water;
mixing deionized water solution dissolved with organic glycogen, performing ultrasonic treatment, heating and stirring until the mixture is dried by distillation, and drying to obtain powder;
and placing the powder into a heating furnace for anaerobic heating to obtain the carbon-coated graphite.
2. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: cutting the negative electrode material into fragments, putting the fragments into a tube furnace, introducing nitrogen, raising the temperature to 1200-1400 ℃ under a vacuum condition, and heating the fragments for 2-4 hours to volatilize and decompose the binder and other organic solvents to obtain powder.
3. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: and mixing the powder with deionized water, carrying out ultrasonic vibration treatment for 15-30 minutes, filtering the solution subjected to vibration treatment by using filter paper, and drying the powder in a 60-80 ℃ drying oven after filtering to obtain the residual powder.
4. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 3, wherein the method comprises the following steps: sieving the residual powder through a 200-mesh sieve to obtain copper particles on the sieve; and sieving the powder obtained by sieving through a 300-mesh sieve, and then sieving through 600-mesh and 800-mesh sieves, and recovering the graphite between the 600-mesh sieve and the 800-mesh sieve to obtain the recovered graphite.
5. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: and putting the recovered graphite into deionized water, performing ultrasonic treatment for 10 minutes to disperse the graphite, and expanding micropores of the graphite to obtain a graphite dispersion solution.
6. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: and the organic glycogen is glucose, sucrose or starch, is dissolved in deionized water according to the mass ratio of 5-15%, the mixed solution is subjected to ultrasonic vibration treatment for 10-20 minutes, after ultrasonic treatment, the solution is placed in a water bath kettle at the temperature of 70-80 ℃ to be stirred until the solvent is evaporated to dryness, and after evaporation, the powder is placed in an oven at the temperature of 60-80 ℃ to be dried, so that the residual powder is obtained.
7. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: putting the powder into a tube furnace, introducing nitrogen, raising the temperature to 800-900 ℃ under the vacuum condition, and heating the fragments for 1-2 hours to carbonize the material; the lithium ion battery is a fully discharged lithium ion battery.
8. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: and (3) dismantling the lithium ion battery in a sodium chloride solution for discharging and naturally air-drying, and then dismantling to separate out a negative electrode material, a positive electrode material, a diaphragm and a steel shell.
9. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: cutting the negative electrode material into 1-3cm2And (4) fragmenting.
10. The method for preparing high-capacity high-rate graphite by using the waste lithium ion battery negative electrode material as the raw material according to claim 1, wherein the method comprises the following steps: processing the recycled graphite and the high-performance graphite into a negative electrode material; when the negative electrode material is used for a button lithium ion battery, the button lithium ion battery has the following properties:
under the condition of constant-current charging and discharging of 0.2C, the first-cycle coulombic efficiency of the recovered graphite is 72.99%, and the specific discharge capacity reaches 410.3 mAh/g; the coulombic efficiency is more than or equal to 97.99 percent when the charge-discharge is tested for 100 circles under the condition of constant current charge-discharge 1C, and the discharge specific capacity reaches 252.3 mAh/g; under a multiplying power charge-discharge test, the discharge specific capacity under the 2C condition is 152.1mAh/g, and the capacity retention rate is 39.39%;
under the condition of constant current charging and discharging of 0.2C, the first week coulombic efficiency of the graphite coated with 10% glucose is 78.22%, the specific discharge capacity is 97.17%, and the specific discharge capacity reaches 256 mAh/g; under a multiplying power charge-discharge test, the discharge specific capacity under a 2C condition is 120.9mAh/g, and the capacity retention rate is 33.61%;
under the condition of constant current charging and discharging of graphite coated by 10% of sucrose at 0.2C, the first-week coulombic efficiency is 86.89%, and the discharge specific capacity reaches 384.9 mAh/g; the coulombic efficiency is more than or equal to 99.99 percent under the condition of constant current charging and discharging 1C test, and the discharge specific capacity reaches 331 mAh/g; under a multiplying power charge-discharge test, the discharge specific capacity under a 2C condition is 180.1mAh/g, and the capacity retention rate is 46.84%;
under the condition of constant current charging and discharging of graphite coated by 10% of starch at 0.2C, the first-week coulombic efficiency is 84.85%, and the specific discharge capacity reaches 407.8 mAh/g; the coulombic efficiency is more than or equal to 99.99 percent under the condition of constant current charging and discharging 1C test, and the discharge specific capacity reaches 320.8 mAh/g; under a multiplying power charge-discharge test, the discharge specific capacity under the 2C condition is 116.3mAh/g, and the capacity retention rate is 34.2%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115692910A (en) * | 2022-12-28 | 2023-02-03 | 湖南金阳烯碳新材料股份有限公司 | Method for recovering waste negative electrode material of lithium ion battery |
| CN116639685A (en) * | 2023-06-19 | 2023-08-25 | 深圳光风新能源科技创新中心有限公司 | Recycling method of waste lithium-carbide graphite cathode |
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| CN1567617A (en) * | 2003-06-20 | 2005-01-19 | 比亚迪股份有限公司 | Method for preparing a carbon cathode material of lithium ion battery |
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| CN110690519A (en) * | 2019-09-30 | 2020-01-14 | 中南大学 | Method for recycling lithium ion battery negative electrode material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115692910A (en) * | 2022-12-28 | 2023-02-03 | 湖南金阳烯碳新材料股份有限公司 | Method for recovering waste negative electrode material of lithium ion battery |
| CN115692910B (en) * | 2022-12-28 | 2023-03-03 | 湖南金阳烯碳新材料股份有限公司 | Method for recovering waste negative electrode material of lithium ion battery |
| CN116639685A (en) * | 2023-06-19 | 2023-08-25 | 深圳光风新能源科技创新中心有限公司 | Recycling method of waste lithium-carbide graphite cathode |
| CN116639685B (en) * | 2023-06-19 | 2023-12-22 | 深圳光风新能源科技创新中心有限公司 | Recycling method of waste lithium-carbide graphite cathode |
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