CN115172745B - Method for obtaining negative active material, negative pole piece and lithium ion battery - Google Patents
Method for obtaining negative active material, negative pole piece and lithium ion battery Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a method for obtaining a negative active material, a negative pole piece and a lithium ion battery, wherein the method for obtaining the negative active material comprises the following steps: obtaining the oil absorption value QI and the OI value V of the cathode active material OI And its powder compacted density PD, wherein the unit of QI is ml/100g, the unit of PD is g/cm 3 (ii) a Screening out QI and V OI The relation between the molecular weight and PD is more than or equal to 1 and less than or equal to QI/V OI * The PD is less than or equal to 600. The lithium ion battery negative pole piece prepared from the negative active material obtained by the invention has higher charging capacity, and meanwhile, the lithium ion battery also has good cycle service life and safety when being used for long-term quick charging, and the effect is obvious.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a method for obtaining a negative active material, a negative pole piece and a lithium ion battery.
Background
The negative active material is a key material of the lithium ion battery, and plays a very important role in the cycle, fast charge and high temperature performance of the lithium ion battery, while there are various factors that influence the cycle, fast charge and high temperature performance of the lithium ion battery in the prior art, including but not limited to the dynamic performance, liquid retention performance, pressure resistance, oil absorption value, etc. of the material, the prior art discloses the influence of some of the factors on some performances of the lithium ion battery, for example: in the all-solid-state lithium secondary battery disclosed in CN111755741A, its manufacturing method, its using method, and its charging method, the correlation between the oil absorption value and the discharge rate characteristic is described, but at the same time, the influence factor that influences the discharge rate characteristic includes not only the oil absorption value but also the nitrogen adsorption specific surface area of the negative electrode active material and the like. Similarly, the oil absorption value only affects the discharge rate characteristic of the battery, and also affects the cycle characteristic.
The following steps are repeated: CN108807847A discloses a negative electrode sheet and a battery, wherein a negative electrode sheet is disclosed, which includes a negative electrode current collector and a negative electrode membrane disposed on at least one surface of the negative electrode current collector and including a negative electrode active material. The negative active material comprises graphite, and the negative diaphragm has an OI value V OI The relation between the compacted density PD of the negative electrode membrane sheet and the compacted density PD of the negative electrode membrane sheet satisfies that: 0.7 is less than or equal to (80/V) OI +43/PD)×PD/V OI Less than or equal to 21.5, wherein the unit of the compacted density PD of the negative electrode diaphragm is g/cm 3 . It is disclosed in this document that the battery can be used to satisfy the demand for rapid charging of the battery by the limitation of the above conditions, and has a long cycle life and a high energy density while securing the demand for rapid charging.
The high-temperature performance of the battery is also one of important performances for measuring the comprehensive performance of the battery, and the negative active material with excellent comprehensive performance of cycle, quick charge and high temperature is obtained, so that the negative pole piece of the lithium ion battery can be effectively ensured to have higher charging capacity and cycle performance, and meanwhile, the lithium ion battery is ensured to have good cycle service life and safety when being used for long-term quick charge. Therefore, how to obtain a negative active material capable of balancing cycle, fast charge and high temperature performance is a key and difficult point in the subsequent battery development.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that how to obtain a negative active material with balanced cycle, fast charge and high temperature performance is not disclosed in the prior art, so as to provide a method for obtaining a negative active material, a negative electrode plate and a lithium ion battery, which can ensure that the negative electrode plate of the lithium ion battery has higher charge capacity and cycle performance, and simultaneously ensure that the lithium ion battery has good cycle service life and safety when used for long-term fast charge.
A method of obtaining an anode active material, comprising:
obtaining the oil absorption value QI and the OI value V of the cathode active material OI And the powder compaction density PD thereof, wherein the unit of QI is ml/100g, the unit of PD is g/cm 3 ；
Screening out QI and V OI The relation between the molecular weight and PD is more than or equal to 1 and less than or equal to QI/V OI * A negative electrode active material having a PD of 600 or less.
V of the negative electrode active material OI The acquisition method comprises the following steps:
respectively obtaining X-ray diffraction spectra of the cathode active materialsPeak area of 004 characteristic diffraction peak C004 and peak area of 110 characteristic diffraction peak C110, according to V OI Acquiring OI value V of the negative active material by a calculation formula of = C004/C110 OI 。
The method for obtaining the oil absorption value QI of the negative active material comprises the following steps:
respectively obtaining samples of test oil and a negative active material, and setting a torque threshold value of an oil absorption value tester; adding oil into a sample in a mixing chamber of an oil absorption value tester at a constant speed, continuously increasing the viscosity of the mixture of the sample and the oil along with the increase of the oil absorption amount of the sample, stopping and calculating the volume of the sample absorbing the oil in unit mass when the viscosity of the mixture reaches a torque threshold value preset by the oil absorption value tester, wherein the value is the oil absorption value QI of the sample.
The oil is dibutyl phthalate (DBP) and the torque threshold is 1N.
The method for obtaining the powder compaction density PD of the negative active material comprises the following steps:
obtaining a sample of the negative electrode active material with the mass M, loading the sample into a barrel-shaped container with the inner diameter D, pressurizing the sample in the barrel-shaped container to 2 tons, and compacting for 10s to obtain the height H of the compacted sample; PD = M/(H (D/2) according to the formula 2 * Pi) to calculate the powder compaction density PD.
Negative active material with oil absorption values QI and OI values V OI And the powder compacted density PD is more than or equal to 1 and less than or equal to QI/V OI * PD is less than or equal to 600.
The OI value V OI 0.5 to 10;
the oil absorption value QI is 20-100ml/g;
the powder compacted density PD is 0.5-3.0g/cm 3 ；
Preferably, the QI/V OI * The PD has a value of 5 to 200, preferably 10 to 100, more preferably 20 to 60.
A negative pole piece comprises the negative pole active material obtained by the method for obtaining the negative pole active material, or the negative pole active material;
the negative active material in the negative pole piece comprises at least one of artificial graphite, natural graphite, hard carbon, soft carbon, mesocarbon microbeads and lithium titanate.
A lithium ion battery comprising the negative electrode active material obtained by the above-described method for obtaining a negative electrode active material, or the above-described negative electrode active material.
An application of a negative pole piece or a lithium ion battery in consumer electronics, electric tools and electric automobiles.
The technical scheme of the invention has the following advantages:
1. the method provided by the invention can pass the oil absorption values QI and OI values V of different cathode active materials OI Screening out powder compacted density (PD) meeting the relation of 1-QI/V OI * The negative pole piece prepared by using the negative pole active material satisfying the relational expression can effectively ensure the balance of the dynamic performance, the cycle performance and the high-temperature performance of the negative pole piece. Namely, the lithium ion battery negative electrode piece prepared by the negative electrode active material obtained by the method has higher charging capacity, and meanwhile, the lithium ion battery also has good cycle service life and safety when being used for long-term quick charging, and the effect is obvious.
2. In the negative active material provided by the invention, the OI value V OI The dynamic performance of the pole piece can be reflected, the oil absorption value QI can reflect the contact impedance of the material and the electrolyte interface, and the powder compaction density PD can reflect the liquid retention performance and the pressure resistance of the pole piece; wherein, the oil absorption value QI is high, the contact between the material and the electrolyte is good, the impedance is low, and the dynamics is good; the oil absorption value QI is low, and the dynamic deviation is high; OI value V OI The lower the kinetic performance, the better; OI value V OI The higher the kinetic performance is, the worse. The oil absorption value QI of the interface between the negative active material such as reaction graphite and the electrolyte, the OI value of the distance between the negative active material layers such as reaction graphite and the like, and the compaction density PD of the pressure resistance and the liquid retention performance of the reaction powder material play important roles in the dynamic performance, the cycle performance, the power and the high-temperature performance of the battery; wherein, the larger the oil absorption value is, the smaller the OI value is, the poorer the high-temperature storage performance is, but the better the multiplying power performance is; and the cycle performance and the suctionThe oil value, the compaction density and the OI value are all related, and how to comprehensively control the balance of the cycle performance, the high-temperature storage performance and the rate performance is the key point and the difficulty in screening the negative electrode material. The inventors have intensively studied and found that QI/V can be controlled OI * The PD is in a specific range value, and can comprehensively realize the regulation and control of the cycle performance, the high-temperature performance and the rate performance, especially when QI/V OI * The PD value is controlled within the range of 0-600, the cycle performance can reach more than 86%, the high-temperature performance can reach more than 82%, and the rate performance can also reach more than 84%, so that the balance of the cycle performance, the high-temperature storage performance and the rate performance is achieved. In conclusion, the invention creatively controls the oil absorption value QI and the OI value V of the cathode active material OI And the parameter between the powder compaction density PD reaches 1-QI/V OI * The PD is less than or equal to 600, and the balance among quick charge, circulation and high-temperature performance of the negative pole piece prepared by the negative pole active material is realized.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is an X-ray diffraction pattern of a negative active material of composition 1 in example 1 of the present invention.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not indicate specific experimental procedures or conditions, and can be performed according to the procedures or conditions of the conventional experimental procedures described in the literature in the field. The reagents or instruments used are conventional reagent products which are commercially available, and manufacturers are not indicated.
Example 1
Obtaining artificial graphite with different granulation ratios, surface carbon residue and specific surface areas as a negative active material, and obtaining oil absorption values QI and OI values V of different artificial graphite by the following method OI And its powder compacted density PD, QI and V of different artificial graphite OI And PD is shown in the following table 1, and the oil absorption values QI and OI values V are adopted OI And the powder compaction density PD thereof obtains QI/V of different artificial graphite cathode active materials OI * The PD values, results are shown in Table 1 below.
In the embodiment, the different artificial graphite is used as a negative active material to prepare the negative pole piece by adopting a conventional preparation method of the negative pole piece. Specifically, the preparation process of the negative pole piece comprises the following steps: according to the mass ratio of 95:1:4:150, weighing the negative active material, the conductive agent SP, the binder LA133 and the deionized water, uniformly mixing by a paddle closing machine, and preparing the negative pole piece by a coating machine and a roller press.
The process for obtaining the oil absorption value QI in the embodiment is as follows: respectively obtaining samples of DBP (DBP) of the test oil and a negative active material, and setting a torque threshold value of an oil absorption value tester to be 1N; weighing the weight W of a sample, placing the sample in a mixing chamber of an oil absorption value tester, adding oil DBP to the sample in the mixing chamber of the oil absorption value tester at a constant speed, increasing the viscosity of the mixture of the sample and the oil along with the increase of the oil absorption amount of the sample, stopping adding the DBP and obtaining the volume V of the input oil when the viscosity of the mixture reaches a preset torque threshold value 1N of the oil absorption value tester, and converting the volume of the oil absorbed by the sample per 100g of unit mass, wherein the value is the oil absorption value QI of the sample, and the unit is ml/100g.
In this embodiment, the OI value V OI The acquisition process of (1) is as follows: respectively obtaining an X-ray diffraction spectrogram of the negative electrode active material, wherein as shown in figure 1, the peak area C004 of the 004 characteristic diffraction peak and the peak area C110 of the 110 characteristic diffraction peak in the X-ray diffraction spectrogram are according to V OI Acquiring OI value V of the negative active material by using a calculation formula of = C004/C110 OI 。
The process for obtaining the powder compaction density PD of the negative electrode active material in this embodiment is as follows: obtaining a sample of a negative electrode active material with mass M, putting the sample into a barrel-shaped container with inner diameter D, pressurizing the sample in the barrel-shaped container to 2 tons, and compacting for 10s to obtain the height H of the compacted sample; PD = M/(H (D/2) according to the formula 2 * Pi) calculating the powder compacted density PD with the unit of g/cm 3 。
TABLE 1
| Composition 1 | Composition 2 | Composition 3 | Composition 4 | |
|
| Kind of negative electrode active material | Artificial graphite | Artificial graphite | Artificial graphite | Artificial graphite | Artificial graphite |
| VOI | 2.3 | 1.5 | 3.3 | 2.8 | 2.1 |
| QI | 42 | 55 | 60 | 57 | 49 |
| PD | 1.2 | 1.6 | 1.55 | 1.65 | 1.58 |
| QI/ VOI *PD | 21.91 | 58.67 | 28.18 | 33.59 | 36.87 |
| |
50% | 100% | 20% | 100% | 100% |
| Amount of carbon residue on surface | 2.0% | 2.5% | 3.0% | 1.5% | 1.0% |
| Specific surface area | 1.5 | 1.6 | 1.7 | 1.2 | 1.5 |
Lithium iron phosphate is used as a positive electrode, and lithium-containing salt LiPF is used 6 The solution (concentration 1.3 mol/L) and EC (ethylene carbonate) + DEC (diethyl carbonate) with the solvent being 1 in volume ratio are used as electrolyte, and celgard 2400 is used as a diaphragm, so as to prepare the 5Ah soft-package battery.
Example 2
Different kinds of substances having different granulation ratios, surface carbon residue amounts, and specific surface areas shown in the following table 2 were obtained as the negative electrode active materials having oil absorption values QI, OI values V shown in the following table 2 OI And the powder compaction density PD, in this example the oil absorption QI and OI V values OI The method for obtaining the powder compaction density PD is the same as that in the embodiment 1, and the oil absorption values QI and OI values V are obtained through detection OI And calculating QI/V of the cathode active material by using the powder compaction density PD OI * PD values are shown in Table 2 below. In this embodiment, the same general negative electrode sheet preparation method as that in embodiment 1 is also adopted to prepare the negative electrode active material with different compositions into a negative electrode sheet.
TABLE 2
| Composition 6 | Composition 7 | Composition 8 | Composition 9 | |
|
| Kind of negative electrode active material | Natural graphite | Hard carbon | Soft carbon | Mesocarbon microbeads | Lithium titanate |
| VOI | 1 | 0.8 | 7 | 10 | 0.5 |
| |
30 | 70 | 80 | 20 | 100 |
| PD | 3 | 2 | 0.8 | 0.5 | 3 |
| QI/ VOI *PD | 90.00 | 175.00 | 9.14 | 1.00 | 600.00 |
| Granulation ratio | 90% | 100% | 100% | 100% | 100% |
| Amount of surface |
5% | 8% | 10% | 2% | 10% |
| Specific surface area | 3.5 | 5.0 | 0.5 | 5.0 | 3.5 |
Lithium iron phosphate is used as a positive electrode, and lithium-containing salt LiPF is used 6 The solution (concentration of 1.3 mol/L), EC (ethylene carbonate) + DEC (diethyl carbonate) with the solvent in the volume ratio of 1 as a volume ratio, and celgard 2400 as a diaphragm are used for preparing the 5Ah soft-package battery.
Comparative example 1
Different granulation ratios were obtained as shown in Table 3 below,Different substances with surface residual carbon amount and specific surface area are used as the negative active materials, and the oil absorption values QI and OI values V of the negative active materials are obtained OI And the powder compaction density PD, and the oil absorption value QI and OI value V obtained by detection OI And calculating QI/V of the cathode active material by using the powder compaction density PD OI * PD value, as shown in Table 3 below, oil absorption QI and OI V in this example OI And the powder compacted density PD thereof were obtained in the same manner as in example 1,
the negative active material was prepared into a negative electrode sheet by the same method as in example 1.
TABLE 3
| Comparative example 1 | Comparative example 2 | |
| Kind of negative electrode | Artificial graphite | Artificial graphite |
| VOI | 0.3 | 20 |
| QI | 200 | 8 |
| PD | 1 | 2 |
| QI/ VOI *PD | 667 | 0.8 |
| |
0% | 100% |
| Amount of surface |
0% | 0.4% |
| Specific surface area | 2.0 | 0.2 |
Lithium iron phosphate is used as a positive electrode, and lithium-containing salt LiPF is used 6 The solution (concentration 1.3 mol/L) and EC (ethylene carbonate) + DEC (diethyl carbonate) with the solvent being 1 in volume ratio are used as electrolyte, and celgard 2400 is used as a diaphragm, so as to prepare the 5Ah soft-package battery.
Test examples
The cycle performance, the rate performance and the high-temperature storage performance of the soft package battery obtained in the embodiment and the comparative example are detected, and the specific detection parameters are set as follows:
cycle performance: 1C/1C,2.5-3.65V,25 +/-3 ℃;
rate capability: 2C constant current ratio, constant current capacity/(constant current capacity + constant voltage capacity);
high-temperature storage performance: the lithium ion battery was charged to 3.65V at a rate of 0.1C, tested for capacity A0, then left at a temperature of 55 ± 3 ℃ for 7 days, then tested for capacity A1 of its battery at normal temperature, then recharged to 3.65V, and tested for capacity A2, and then the capacity recovery = A2/A0 100%, i.e., high temperature storage performance, was calculated.
The results of the above tests are shown in table 4 below.
TABLE 4
| Cycle performance (500 weeks) | Multiplying power performance (2C constant current ratio) | High temperature storage (55 ℃, 7D) | |
| Composition 1 | 94.60% | 90.70% | 97.40% |
| Composition 2 | 90.70% | 93.00% | 93.40% |
| Composition 3 | 93.80% | 92.70% | 97.60% |
| Composition 4 | 90.70% | 91.60% | 93.80 |
| Composition | |||
| 5 | 91.80% | 90.70% | 94.10% |
| Composition 6 | 86.7% | 93.91% | 90.6% |
| Composition 7 | 90.9% | 94.21% | 86.91% |
| Composition 8 | 89.7% | 85.91% | 85.64% |
| Composition 9 | 91.6% | 84.12% | 88.94 |
| Composition | |||
| 10 | 90.23% | 95.11% | 83.21% |
| Comparative example 1 | 84.8% | 87.7% | 82.3% |
| Comparison 2 | 85.7% | 92.5% | 80.3% |
From the comparison of the above compositions 1-10 with those of comparisons 1-2, it can be seen that when QI/V is applied OI * The value of PD is controlled within the range of 0-600, the multiplying power performance can be controlled to be more than 84%, the cycle performance can reach more than 86%, the high-temperature performance can reach more than 82%, and the balance among quick charge, cycle and high-temperature performance of the negative pole piece prepared from the negative active material group is effectively realized. And in comparison 1 by V OI The oil absorption value QI is very large, the side reactions are more, and the circulating performance deviation is caused by high temperature difference; in comparative example 2, the dynamic deviation and the cycle performance deviation are caused by too high compaction density.
By comparing compositions 1-8 with compositions 9-10: when QI/V OI * The PD value is controlled within the range of 5-200, the multiplying power performance and the high-temperature performance can be comprehensively improved, and the multiplying power performance and the high-temperature performance of the negative pole piece prepared from the screened negative active material are further improved.
By comparing compositions 1-5 with compositions 6-10: when QI/V OI * The value of PD is controlled within the range of 20-60, the multiplying power performance can be controlled to be more than 90%, the cycle performance can reach more than 90%, and the high-temperature performance can reach more than 93%, namely, the negative active material capable of improving the cycle and high-temperature performance of the negative pole piece can be effectively screened out under the condition of excellent quick charge performance.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A method of obtaining an anode active material, comprising:
obtaining the oil absorption values QI and OI value V of the cathode active material OI And its powder compacted density PD, wherein the unit of QI is ml/100g, the unit of PD is g/cm 3 ；
Screening out QI and V OI The relation between the molecular weight and PD is more than or equal to 20 and less than or equal to QI/V OI * A negative electrode active material having a PD of 60 or less;
the OI value V OI 1.5 to 3.3; the oil absorption value QI is 42-60ml/100g; the powder body compaction density PD is 1.2-1.65g/cm 3 ；
V of the negative electrode active material OI The acquisition method comprises the following steps:
respectively obtaining the peak area C004 of the 004 characteristic diffraction peak and the peak area C110 of the 110 characteristic diffraction peak in the X-ray diffraction spectrogram of the cathode active material according to V OI Acquiring OI value V of the negative active material by using a calculation formula of = C004/C110 OI ；
The method for obtaining the oil absorption value QI of the negative active material comprises the following steps:
respectively obtaining samples of test oil and a negative active material, and setting a torque threshold value of an oil absorption value tester; adding oil to a sample in a mixing chamber of an oil absorption value tester at a constant speed, continuously increasing the viscosity of the mixture of the sample and the oil along with the increase of the oil absorption amount of the sample, stopping and calculating the volume of the sample absorbing the oil in unit mass when the viscosity of the mixture reaches a torque threshold value preset by the oil absorption value tester, wherein the value is the oil absorption value QI of the sample;
the method for obtaining the powder compaction density PD of the negative active material comprises the following steps:
obtaining a sample of a negative electrode active material with mass M, putting the sample into a barrel-shaped container with inner diameter D, pressurizing the sample in the barrel-shaped container to 2 tons, and compacting for 10s to obtain the height H of the compacted sample; PD = M/(H (D/2) according to the formula 2 * Pi) to calculate the powder compaction density PD.
2. The method of claim 1, wherein the oil is dibutyl phthalate and the torque threshold is 1N.
3. A negative electrode active material obtained by the method for obtaining a negative electrode active material according to any one of claims 1 to 2.
4. A negative electrode sheet comprising the negative electrode active material obtained by the method for obtaining a negative electrode active material according to any one of claims 1 to 2, or the negative electrode active material according to claim 3;
the negative active material in the negative pole piece comprises at least one of artificial graphite, natural graphite, hard carbon, soft carbon, mesocarbon microbeads and lithium titanate.
5. A lithium ion battery comprising the negative electrode active material obtained by the method for obtaining a negative electrode active material according to any one of claims 1 to 2, or the negative electrode active material according to claim 3.
6. Use of a lithium ion battery according to claim 5 in consumer electronics, power tools and electric vehicles.
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| CN115000386A (en) * | 2022-07-07 | 2022-09-02 | 欣旺达电动汽车电池有限公司 | Negative electrode active material, negative electrode plate, lithium ion battery and electric equipment |
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| WO2022021273A1 (en) * | 2020-07-31 | 2022-02-03 | 宁德时代新能源科技股份有限公司 | Secondary battery, preparation method therefor, and battery module, battery package and device containing same |
| CN115000386A (en) * | 2022-07-07 | 2022-09-02 | 欣旺达电动汽车电池有限公司 | Negative electrode active material, negative electrode plate, lithium ion battery and electric equipment |
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| "炭黑 第2部分：吸油值的测定";中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会;《中华人民共和国国家标准GB/T 3780.2—2017代替GB/T 3780.2—2007》;20171101;第1～12页 * |
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