CN106601994B - Negative electrode, preparation method thereof and low-temperature lithium ion battery - Google Patents
Negative electrode, preparation method thereof and low-temperature lithium ion battery Download PDFInfo
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- CN106601994B CN106601994B CN201710006773.4A CN201710006773A CN106601994B CN 106601994 B CN106601994 B CN 106601994B CN 201710006773 A CN201710006773 A CN 201710006773A CN 106601994 B CN106601994 B CN 106601994B
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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
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- 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
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- 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
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Abstract
The invention provides a negative electrode, a preparation method thereof and a low-temperature lithium ion battery. The negative electrode comprises a current collector and an active layer combined on the surface of the current collector, wherein the negative electrode material contained in the active layer comprises first artificial graphite and second artificial graphite; the cathode material contained in the cathode active layer of the invention comprises the first artificial graphite and the second artificial graphite composite with two specific OI value ranges, so that the uniformity of the thickness and the low orientation degree of both sides of the cathode is better, and the high-current low-temperature performance of the battery is effectively improved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a negative electrode, a preparation method thereof and a low-temperature lithium ion battery.
Background
Lithium ion batteries are widely used in mobile phones and notebook batteries, power batteries, energy storage batteries, and the like due to their excellent properties such as high voltage, high energy density, and long cycle life. The battery of the mobile phone and the notebook computer is completely occupied by the lithium ion battery, and the battery of other types can not meet the strict requirements of the portable intelligent equipment. With the development of lithium ion battery technology, the proportion of the lithium ion battery in the power battery energy storage battery is also getting larger and larger, and from the current development trend, the lithium ion battery is in a rapid development stage and has a wide application prospect. With the increasing application of lithium ion batteries, the requirements for lithium ion batteries are also increasing. Such as the high current and low temperature performance of lithium ion batteries, are also increasingly demanding.
At present, with the gradual marketization of the aqueous binder LA133, the application of domestic negative electrode materials in low-temperature batteries is gradually promoted, and particularly the low-temperature cycle performance is obviously improved; however, the market requirements for low temperature battery performance, especially high current low temperature performance, are far from being met. At present, in order to improve the high-current low-temperature performance of the battery, the prior art generally adds some heating auxiliary devices to the battery structure. When charging, the heating auxiliary device is firstly heated to a preset temperature, and then the battery cell is charged and discharged by large current. The method can improve the high-current low-temperature performance of the battery to a certain extent, but cannot fundamentally solve the polarization effect of the battery generated under the condition of low temperature and high current. Meanwhile, the heating auxiliary device not only occupies the effective space of the battery and is expensive, but also has certain influence on the safety performance of the battery.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a negative electrode and a preparation method thereof, so as to solve the technical problem that the high-current low-temperature performance of the conventional lithium ion battery is not ideal.
The invention also aims to provide a low-temperature lithium ion battery to solve the technical problem that the existing high-current low-temperature performance is not ideal.
In order to achieve the above object, according to one aspect of the present invention, a negative electrode is provided. The negative electrode comprises a current collector and an active layer combined on the surface of the current collector, and the negative electrode material contained in the active layer comprises first artificial graphite and second artificial graphite; wherein the first artificial graphite has an OI value of [1.10-1.20] and the second artificial graphite has an OI value of (1.20-1.30 ].
In another aspect of the present invention, a method of preparing a negative electrode is provided. The preparation method comprises the following steps:
preparing negative electrode slurry according to the following formula in parts by weight:
wherein the first artificial graphite has an OI value of [1.10-1.20], and the second artificial graphite has an OI value of (1.20-1.30 ];
and forming an active layer on the surface of the negative current collector by using the negative electrode slurry.
In yet another aspect of the present invention, there is provided a low temperature lithium ion battery comprising the negative electrode of the present invention or prepared by the preparation method of the present invention.
Compared with the prior art, the negative electrode material contained in the negative electrode active layer of the negative electrode comprises the first artificial graphite and the second artificial graphite composite with two specific OI value ranges, so that the uniformity of the thickness and the low orientation degree formed on two sides of the negative electrode is better, the diffusion path of lithium ions in the charging and discharging process is shortened, and the high-current low-temperature performance of the battery is effectively improved.
According to the negative electrode preparation method, the negative electrode slurry containing the first artificial graphite and the second artificial graphite composite with two specific OI value ranges forms an active layer on the surface of the current collector, so that the prepared negative electrode has good uniformity of the thickness and the low substitution degree of the active layer. In addition, the preparation method has controllable process conditions, and the prepared negative electrode has stable performance.
The low-temperature lithium ion battery provided by the invention contains the negative electrode, so that the low-temperature lithium ion battery provided by the invention has excellent high-current low-temperature performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The parts by weight of the relevant components mentioned in the description of the embodiments of the present invention may not only refer to the content of each component but also to the weight ratio among the components, and therefore, it is within the scope of the disclosure of the description of the embodiments of the present invention to scale up or down the content of the relevant components according to the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.
In one aspect, embodiments of the present invention provide a negative electrode. The negative electrode includes a current collector and an active layer bonded to a surface of the current collector.
The current collector included in the negative electrode may be a negative electrode current collector commonly used in lithium ion batteries. If the current collector has two opposite surfaces, the active layer contained in the negative electrode is combined on the two surfaces of the current collector, specifically, copper foil and the like.
The active layer contained in the above-described negative electrode may contain a negative active material, a conductive agent, a binder, a solvent, and the like, as in the present negative active layer. Wherein. In an embodiment of the present invention, the negative electrode active material includes a first artificial graphite and a second artificial graphite; wherein, the OI value of the first artificial graphite is 1.10-1.20, the OI value of the second artificial graphite is 1.20-1.30, under the condition of low temperature and large current, the battery can generate great polarization effect in the charging and discharging process, at the moment, the diffusion speed of lithium ions can directly influence the large current and low temperature performance of the battery, and the negative electrode uses the first artificial graphite and the second artificial graphite compound with two specific OI value ranges as negative electrode active substances, so that the negative electrode active layer substances with two OI values play a synergistic effect, the thickness and low orientation degree uniformity formed on the two sides of the negative electrode are better, the low temperature performance of the battery is effectively improved, the risks of uneven dispersion and uneven distribution of the OI value of the single artificial graphite with the large current are avoided, and the diffusion path of lithium ions in the charging and discharging process of the single OI value artificial graphite is shortened, thereby improving the high-current low-temperature performance of the battery.
In one embodiment, the weight ratio of the first artificial graphite to the second artificial graphite in the above OI value range is controlled to be (46.5-48.0): (46.5-48.0). The content ratio of the negative electrode active layer and the active layer is controlled to provide synergistic effect of the two, so that the thickness and the low orientation degree uniformity of the negative electrode active layer are improved, and the high-current low-temperature performance of the battery is further improved.
Based on the content ratio of the first artificial graphite and the second artificial graphite in the range of the two OI values, the active layer contains the following components in parts by weight:
wherein the first artificial graphite and the second artificial graphite each have an OI value in the range as described above. In a specific embodiment, the particle size distribution of the first artificial graphite and/or the second artificial graphite is as follows:
D10：3.0-4.0um
D50：7.5-8.5um
D90：15.5-16.5um
Dmax：40.0-45.0um。
the artificial graphite having the particle size range assists the specific range of the OI value of the first artificial graphite and the second artificial graphite to improve the thickness of the active layer and the uniformity of the low degree of orientation, and to shorten the diffusion path of lithium ions during charge and discharge, thereby improving the high-current low-temperature performance of the battery.
The conductive agent may be a conductive agent commonly used in the field of lithium ion batteries, and as an embodiment of the present invention, the conductive agent is at least one of aqueous CNTs, SP, and ketjen black.
The binder may be a conductive agent commonly used in the field of lithium ion batteries, and as an embodiment of the present invention, the binder is at least one of LA133 and NV-1A. Wherein LA133 may be, but is not limited to, a product produced by Chengdingdele corporation, and NV-1A may be, but is not limited to, a product produced by Zhongkoride corporation.
In addition, in order to improve the quality of the active layer, some corresponding auxiliary agents, such as a dispersing agent, a wetting agent and the like, can be added in the process of preparing the active layer slurry. The active layer may also contain the additives, such as dispersing agent and wetting agent commonly used in lithium ion battery electrode paste, for example, carboxymethyl cellulose (CMC) with a substitution degree (d.s 0.85-0.95) may be used as the dispersing agent.
In the above embodiments, as an embodiment of the present invention, the thickness of the active layer is 75 to 90 μm. The first artificial graphite and the second artificial graphite providing the range of the two OI values provide synergistic effects of the two by adjusting the thickness of the active layer, so that the high-current low-temperature performance of the battery is improved.
Therefore, the active layers combined on the two surfaces of the negative current collector of the negative electrode in the embodiments have good uniformity of thickness and low orientation degree, and small internal resistance, and can effectively improve the high-current low-temperature performance of the battery.
On the other hand, the embodiment of the invention also provides a preparation method of the negative electrode of the embodiment of the invention. In one embodiment, a method of making a negative electrode of an embodiment of the invention includes the steps of:
s01, preparing negative electrode slurry according to the following formula in parts by weight:
and S02, forming an active layer on the surface of the negative current collector by using the negative electrode slurry.
Specifically, in step S01, the first artificial graphite, the second artificial graphite, the conductive agent, and the binder are all as described above for the first artificial graphite, the second artificial graphite, the conductive agent, and the binder included in the negative electrode according to the embodiment of the present invention, and are not described herein again.
In one embodiment, the method of formulating the negative electrode slurry is as follows:
step S11: mixing the binder with part of deionized water to prepare a glue solution;
step S12: and adding the first artificial graphite and the other part of deionized water into the glue solution for mixing treatment, then adding the second artificial graphite and the third part of deionized water for mixing treatment again, and then adding the rest of deionized water for viscosity adjustment treatment.
Wherein the partial deionization in step S11 may be 20.0-25.0 parts by weight of deionized water; the additional portion of deionized water in step S12 may be 20.0 to 25.0 parts by weight deionized water, and the third portion of deionized water may be 20.0 to 25.0 parts by weight deionized water. That is, in the process of preparing the cathode slurry, deionized water is added in batches, and the mixing sequence of the corresponding components is matched, so that the components are fully soaked and fully and uniformly dispersed.
In a further embodiment, corresponding auxiliary agents, such as a dispersing agent, a wetting agent, etc., are further added in the process of preparing the slurry, for example, in an embodiment, in the process of preparing the glue solution of the step S11, a dispersing agent, such as sodium carboxymethyl cellulose (CMC) with a substitution degree (d.s 0.85-0.95) is further added. In addition, in the step of step 12, a wetting agent may be further added to improve wetting of the negative active material by the deionized water.
In one embodiment, the viscosity of the negative electrode slurry is adjusted to 3000mpa.s-3500mpa.s (23 ± 2 ℃) by the addition of water, such as deionized water, to achieve uniform coating of the negative electrode slurry, ensuring uniformity of the entire active layer.
The deionized water used as the slurry solvent in the negative electrode slurry may be other types of water used in electrode production or in laboratories, such as distilled water, and the like, which is used as the solvent in the present embodiment regardless of the type of water, and therefore, any other water used as a substitute for the deionized water contained in the first active layer slurry is within the scope of the present disclosure.
In the above step S02, the coating of the negative electrode slurry on the surface of the negative electrode current collector may be, but is not limited to, coating according to a conventional coating process. In one embodiment, the thickness of the first active layer formed is 75 to 90 μm by controlling the amount of the negative electrode slurry applied.
The negative electrode current collector in step S02 may be a negative electrode current collector commonly used in lithium ion batteries, such as a copper foil.
It is needless to say that the method for manufacturing a negative electrode according to the embodiment of the present invention further includes other conventional process steps of the electrode sheet, such as sheet production and the like, after the step S02. After the sheet preparation process, the pole piece processed in step S02 is dried. In one embodiment of the present invention, the drying process in step S02 is performed at 90-100 ℃ to remove, for example, the slurry solvent. Drying at this temperature should be sufficient, e.g. 10-14 hours.
Therefore, the method for preparing the negative electrode of the embodiment forms the active layer on the surface of the current collector by using the negative electrode slurry containing the first artificial graphite and the second artificial graphite composite with two specific OI value ranges, so that the prepared negative electrode has better uniformity of the thickness and the low substitution degree of the active layer. In addition, the preparation method has controllable process conditions, and the prepared negative electrode has stable performance.
In another aspect, based on the negative electrode and the preparation method thereof, the embodiment of the invention also provides a low-temperature lithium ion battery. The structure of the low-temperature lithium ion battery can be similar to the conventional structure of the lithium ion battery, wherein the negative electrode contained in the lithium ion battery is the negative electrode of the embodiment of the invention described above or the negative electrode prepared by the preparation method of the embodiment of the invention. In this way, since the low-temperature lithium ion battery according to the embodiment of the invention contains the negative electrode according to the embodiment of the invention described above, the low-temperature lithium ion battery according to the embodiment of the invention is endowed with excellent electrochemical properties, such as excellent high-current low-temperature performance and long service life.
A number of examples of the above-described negative electrodes and methods of making the same will now be provided to further illustrate the invention.
Example 1
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode of the embodiment comprises a negative current collector and a negative active layer coated on the surface of the current collector. Wherein the negative electrode material contained in the active layer comprises a first artificial graphite having an OI value of 1.20 and a second artificial graphite having an OI value of 1.23, and the active layer has a thickness of 75 to 90 μm.
The negative electrode of this example was prepared as follows:
s11, preparing negative electrode slurry:
1) adding 2.5 parts by weight of LA133, 1.5 parts by weight of CMC, 2.0 parts by weight of SP and 20 parts by weight of deionized water in the first step, and vacuumizing and stirring for 1.5 hours by boiling cooling water;
2) then 47.0 parts by weight of artificial graphite cathode active material with the OI value of 1.20 and 20 parts by weight of deionized water are added, and cooling water is started to vacuumize and stir for 1.5 hours;
3) then 47.0 parts by weight of artificial graphite cathode active material with the OI value of 1.23 and 25 parts by weight of deionized water are added, and cooling water is boiled and stirred for 1 hour in a vacuum pumping manner;
4) and finally, adding the rest of deionized water by weight to adjust the viscosity of the negative electrode slurry to 3000-3500 mPa.s, and discharging and sieving by a 150-mesh sieve for later use.
And S12, forming an active layer on the surface of the negative current collector by using the negative electrode slurry, and preparing the negative electrode after subsequent conventional process treatment.
Comparative example 1
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode of the embodiment comprises a negative current collector and a negative active layer coated on the surface of the current collector. Wherein the OI value of the negative electrode material artificial graphite contained in the active layer is 1.20, and the thickness of the active layer is 75-90 μm.
The negative electrode of this example was prepared as follows:
s11, preparing negative electrode slurry:
1) adding 2.5 parts by weight of LA133, 1.5 parts by weight of CMC, 2.0 parts by weight of SP and 20 parts by weight of deionized water in the first step, and vacuumizing and stirring for 1.5 hours by boiling cooling water;
2) then 47.0 parts by weight of artificial graphite cathode active material with the OI value of 1.20 and 20 parts by weight of deionized water are added, and cooling water is started to vacuumize and stir for 1.5 hours;
3) then adding 47.0 parts by weight of artificial graphite cathode active material with the remaining OI value of 1.20 and 25 parts by weight of deionized water, starting cooling water, vacuumizing and stirring for 1 hour;
4) and finally, adding the rest of deionized water by weight to adjust the viscosity of the negative electrode slurry to 3000-3500 mPa.s, and discharging and sieving by a 150-mesh sieve for later use.
And S12, forming an active layer on the surface of the negative current collector by using the negative electrode slurry, and preparing the negative electrode after subsequent conventional process treatment.
Example 2
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode of the embodiment comprises a negative current collector and a negative active layer coated on the surface of the current collector. Wherein the negative electrode material contained in the active layer comprises a first artificial graphite having an OI value of 1.18 and a second artificial graphite having an OI value of 1.22, and the active layer has a thickness of 75 to 90 μm.
The negative electrode of this example was prepared as follows:
step S21, preparing negative electrode slurry:
1) firstly, adding 2.2 parts by weight of LA133, 1.3 parts by weight of CMC, 2.0 parts by weight of aqueous CNTs and 20 parts by weight of deionized water, boiling cooling water, vacuumizing and stirring for 1.5 hours;
2) then 47.25 parts by weight of artificial graphite cathode active material with the OI value of 1.18 and 20 parts by weight of deionized water are added, and cooling water is started to vacuumize and stir for 1.5 hours;
3) then 47.25 parts by weight of artificial graphite cathode active material with the OI value of 1.22 and 25 parts by weight of deionized water are added, and cooling water is boiled and stirred for 1 hour in a vacuum pumping manner;
4) and finally, adding the rest of deionized water by weight to adjust the viscosity of the negative electrode slurry to 3000-3500 mPa.s, and discharging and sieving by a 150-mesh sieve for later use.
And S22, forming an active layer on the surface of the negative electrode current collector by using the negative electrode slurry, and preparing the negative electrode after subsequent conventional process treatment.
Comparative example 2
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode of the embodiment comprises a negative current collector and a negative active layer coated on the surface of the current collector. Wherein the OI value of the negative electrode material artificial graphite contained in the active layer is 1.18, and the thickness of the active layer is 75-90 μm.
The negative electrode of this example was prepared as follows:
step S21, preparing negative electrode slurry:
1) firstly, adding 2.2 parts by weight of LA133, 1.3 parts by weight of CMC, 2.0 parts by weight of aqueous CNTs and 20 parts by weight of deionized water, boiling cooling water, vacuumizing and stirring for 1.5 hours;
2) then 47.25 parts by weight of artificial graphite cathode active material with the OI value of 1.18 and 20 parts by weight of deionized water are added, and cooling water is started to vacuumize and stir for 1.5 hours;
3) then adding 47.25 parts by weight of artificial graphite cathode active material with the remaining OI value of 1.18 and 25 parts by weight of deionized water, starting cooling water, vacuumizing and stirring for 1 hour;
4) and finally, adding the rest of deionized water by weight to adjust the viscosity of the negative electrode slurry to 3000-3500 mPa.s, and discharging and sieving by a 150-mesh sieve for later use.
And S22, forming an active layer on the surface of the negative electrode current collector by using the negative electrode slurry, and preparing the negative electrode after subsequent conventional process treatment.
Example 3
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode of the embodiment comprises a negative current collector and a negative active layer coated on the surface of the current collector. Wherein the negative electrode material contained in the active layer comprises a first artificial graphite having an OI value of 1.20 and a second artificial graphite having an OI value of 1.30, and the active layer has a thickness of 75 to 90 μm.
The negative electrode of this example was prepared as follows:
step S31, preparing negative electrode slurry:
1) firstly, adding 2.0 parts by weight of NV-1A, 1.0 part by weight of CMC, 2.0 parts by weight of SP and 20 parts by weight of deionized water, boiling cooling water, vacuumizing and stirring for 1.5 hours;
2) then 47.5 parts by weight of artificial graphite cathode active material with the OI value of 1.20 and 20 parts by weight of deionized water are added, and cooling water is started to vacuumize and stir for 1.5 hours;
3) then 47.5 parts by weight of artificial graphite cathode active material with the OI value of 1.30 and 25 parts by weight of deionized water are added, and cooling water is boiled and stirred for 1 hour in a vacuum pumping manner;
4) and finally, adding the rest of deionized water by weight to adjust the viscosity of the negative electrode slurry to 3000-3500 mPa.s, and discharging and sieving by a 150-mesh sieve for later use.
And S32, forming an active layer on the surface of the negative current collector by using the negative electrode slurry, and preparing the negative electrode after subsequent conventional process treatment.
Comparative example 3
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode of the embodiment comprises a negative current collector and a negative active layer coated on the surface of the current collector. Wherein the OI value of the negative electrode material artificial graphite contained in the active layer is 1.20, and the thickness of the active layer is 75-90 μm.
The negative electrode of this example was prepared as follows:
step S31, preparing negative electrode slurry:
1) firstly, adding 2.0 parts by weight of NV-1A, 1.0 part by weight of CMC, 2.0 parts by weight of SP and 20 parts by weight of deionized water, boiling cooling water, vacuumizing and stirring for 1.5 hours;
2) then 47.50 parts by weight of artificial graphite cathode active material with the OI value of 1.2 and 20 parts by weight of deionized water are added, and cooling water is boiled and stirred for 1.5 hours in a vacuum pumping manner;
3) then 47.50 parts by weight of artificial graphite cathode active material with the remaining OI value of 1.2 and 25 parts by weight of deionized water are added, and cooling water is started to vacuumize and stir for 1 hour;
4) and finally, adding the rest of deionized water by weight to adjust the viscosity of the negative electrode slurry to 3000-3500 mPa.s, and discharging and sieving by a 150-mesh sieve for later use.
And S32, forming an active layer on the surface of the negative current collector by using the negative electrode slurry, and preparing the negative electrode after subsequent conventional process treatment.
Example 4
The present embodiment provides a negative electrode and a method of preparing the same. The negative electrode structure of this example was the same as that of example 1, except that in example 4, the first artificial graphite had an OI value of 1.10 and the second artificial graphite had an OI value of 1.30, and the weight ratio of the first artificial graphite to the second artificial graphite was 48.0: 46.5.
the preparation method was the same as the preparation method of the negative electrode in example 1.
Example 5
The present embodiment provides a negative electrode and a method of preparing the same. In the negative electrode structure of this example, as in the negative electrode structure of example 4, the weight ratio of the first artificial graphite to the second artificial graphite was 46.5: 48.0.
the preparation method was the same as the preparation method of the negative electrode in example 1.
Electrochemical performance test
The negative electrodes provided in examples 1 to 5 and the negative electrode sheets provided in comparative examples 1 to 3 were assembled into lithium ion batteries according to a conventional procedure with a positive electrode sheet, an electrolyte, and the like, respectively, and the performance tests in the following table 1 were performed on each lithium ion battery, in which each lithium ion was the same as the positive electrode sheet, the electrolyte, and the like except for the negative electrode sheet. Wherein, the test results of examples 1-3 and comparative examples 1-3 are shown in the following table 1:
TABLE 1
Additionally, lithium ion batteries containing negative electrodes provided in examples 4 and 5 above were tested for associated performance results as in table 1, similar to those of examples 1-3. From the above data, it can be seen that the battery containing the negative electrode provided by the embodiment of the present invention has high-current low-temperature performance.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A negative electrode comprising a current collector and an active layer bonded to a surface of the current collector, characterized in that: the negative electrode material contained in the active layer includes first artificial graphite and second artificial graphite; wherein the first artificial graphite has an OI value of 1.10-1.20, the second artificial graphite has an OI value of 1.20-1.30, and the negative electrode is used in a lithium ion battery to improve the high-current low-temperature performance of the battery;
the particle size distribution of the first artificial graphite and the second artificial graphite is as follows:
D10：3.0-4.0um
D50：7.5-8.5um
D90：15.5-16.5um
Dmax：40.0-45.0um。
2. the negative electrode of claim 1, wherein: the weight ratio of the first artificial graphite to the second artificial graphite is (46.5-48.0): (46.5-48.0).
3. The negative electrode of claim 1 or 2, wherein: the weight contents of the first artificial graphite, the second artificial graphite and the binder and the conductive agent contained in the negative electrode are as follows:
4. the negative electrode of claim 3, wherein: the conductive agent is selected from at least one of SP, water-based CNTs and Ketjen black.
5. The negative electrode of claim 3, wherein: LA133 is selected as the binder.
6. The negative electrode of any one of claims 1, 2, 4, and 5, wherein: the thickness of the active layer is 75-90 μm.
7. A method of making a negative electrode, comprising: the method comprises the following steps:
preparing negative electrode slurry according to the following formula in parts by weight:
wherein the first artificial graphite has an OI value of [1.10-1.20], and the second artificial graphite has an OI value of (1.20-1.30 ];
forming an active layer on the surface of a negative current collector by using the negative electrode slurry;
the particle size distribution of the first artificial graphite and the second artificial graphite is as follows:
D10：3.0-4.0um
D50：7.5-8.5um
D90：15.5-16.5um
Dmax：40.0-45.0um。
8. the method of claim 7, wherein: the method for preparing the negative electrode slurry comprises the following steps:
mixing the binder with part of deionized water to prepare a glue solution;
and adding the first artificial graphite and the other part of deionized water into the glue solution for mixing treatment, then adding the second artificial graphite and the third part of deionized water for mixing treatment again, and then adding the rest of deionized water for viscosity adjustment treatment.
9. The production method according to claim 7 or 8, characterized in that: the negative electrode slurry also contains 1.0-1.5 parts by weight of a dispersant, and the dispersant is prepared into a glue solution together with a binder; and/or
The viscosity of the negative electrode slurry is 3000mPa.s-3500 mPa.s.
10. A lithium ion battery comprising a negative electrode, characterized in that: the negative electrode is the negative electrode according to any one of claims 1 to 6 or the negative electrode prepared by the preparation method according to any one of claims 7 to 9.
Priority Applications (1)
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| KR102546827B1 (en) * | 2018-04-24 | 2023-06-21 | 삼성에스디아이 주식회사 | Negative active material for rechargeable lithium battery and rechargeable lithium battery including same |
| CN108807849B (en) * | 2018-05-16 | 2019-11-15 | 宁德时代新能源科技股份有限公司 | Negative electrode plate and secondary battery containing same |
| CN112563491B (en) | 2019-03-21 | 2023-10-24 | 宁德新能源科技有限公司 | Negative electrode material, negative electrode comprising same, and electrochemical device |
| CN110492066B (en) * | 2019-08-01 | 2022-01-11 | 深圳市比克动力电池有限公司 | Lithium ion battery negative plate capable of being charged quickly and preparation method thereof |
| CN111628141B (en) * | 2020-07-16 | 2021-05-25 | 珠海冠宇电池股份有限公司 | Silicon-doped negative pole piece and lithium ion battery comprising same |
| CN113394370B (en) * | 2021-05-08 | 2022-11-18 | 江苏正力新能电池技术有限公司 | Electrode plate and battery containing same |
| CN114005957A (en) * | 2021-09-28 | 2022-02-01 | 东莞维科电池有限公司 | Negative pole piece, preparation method thereof and lithium ion battery |
| CN114628634B (en) * | 2022-04-11 | 2023-09-15 | 蜂巢能源科技(无锡)有限公司 | Positive plate, preparation method and all-solid-state battery |
| CN116885102A (en) * | 2023-09-07 | 2023-10-13 | 青岛泰达天润碳材料有限公司 | Negative electrode plate adopting hard carbon graphite composite structure and storage battery |
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