CN115084449A - Manufacturing method of quick-charging negative pole piece of lithium battery and lithium ion battery - Google Patents
Manufacturing method of quick-charging negative pole piece of lithium battery and lithium ion battery Download PDFInfo
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- CN115084449A CN115084449A CN202210840049.2A CN202210840049A CN115084449A CN 115084449 A CN115084449 A CN 115084449A CN 202210840049 A CN202210840049 A CN 202210840049A CN 115084449 A CN115084449 A CN 115084449A
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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
- H01M4/139—Processes of manufacture
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a method for manufacturing a fast-charging negative pole piece of a lithium battery and the lithium battery, wherein the method reduces the coating surface density by optimizing proper negative pole surface density, is beneficial to shortening the lithium ion transmission distance and reducing the migration resistance of lithium ions; by optimally selecting a proper anode compaction density, a more spacious lithium ion migration channel is provided; the current collector is precoated with the conductive carbon layer, so that the contact resistance between the negative electrode material and the current collector is reduced, the adhesion capability between the negative electrode material and the current collector can be improved, and the quick charging performance of the battery is improved.
Description
Technical Field
The invention relates to the technical field of lithium battery pole piece processing, in particular to a method for manufacturing a quick-charging negative pole piece of a lithium battery and the lithium battery.
Background
With the development of battery technology, the charging rate of lithium batteries as batteries of common electronic products is also increasing, and various fast charging technologies are emerging. However, the fast charge of the battery is mainly limited by the negative electrode material, and the rapid diffusion of lithium ions in the active material is a main factor affecting the fast charge. During charging of the lithium ion battery, lithium ions migrate to the negative electrode. And the over-high potential caused by the fast charging large current can cause the cathode potential to be too low, the pressure of the cathode for accepting lithium ions is increased, the tendency of generating lithium dendrite is increased, and further the lithium precipitation condition is caused. When the lithium battery is quickly charged, the negative electrode of the lithium battery not only needs to meet the requirement of lithium ion diffusion, but also needs to pay attention to the safety problem caused by the aggravation of lithium analysis, so that the technical difficulty of quick charging of the lithium battery is the diffusion of lithium ions to the negative electrode, and the surface density and the compaction density of a negative electrode material and the conductive carbon layer precoated on a current collector influence the diffusion speed of the lithium ions, and further influence the quick charging performance of the lithium battery.
The lower surface density of the negative electrode material increases the porosity of the material, so that the adsorption quantity of the electrolyte of the material per unit mass is increased, and the contact resistance of the solution is correspondingly reduced; on the other hand, the smaller the surface density and the smaller the thickness of the pole piece, the smaller the diffusion distance of the lithium ions, and meanwhile, the smaller the surface density, the smaller the concentration difference of the positive and negative electrode materials, the diffusion resistance is reduced, and the diffusion speed of the lithium ions in the materials is improved.
Excessive or insufficient compaction density can affect the rate discharge performance of the high-rate battery, and the compaction density has an optimal range in order to achieve ideal high-current discharge performance. The compaction density is too large, the inter-particle distance is reduced, the contact is tighter, the electronic conductivity is enhanced, but the ion moving channel is reduced or blocked, which is not beneficial to the rapid movement of a large amount of ions so as to limit the heavy current discharge of the ions, the polarization is increased in the discharge process, the discharge voltage is reduced, and the discharge capacity is reduced; the compaction density is too small, the distance between particles is increased, ion channels are increased, the liquid absorption amount of electrolyte is increased, the rapid movement of ions is facilitated, but the contact probability and the contact area between particles are reduced due to too large distance between particles, the electronic conduction is not facilitated, the conductivity is reduced, so that the large-current discharge is influenced, and the discharge polarization is increased.
The current collector precoating conductive carbon layer is composed of dispersed nano conductive graphite coating particles and the like. The protective energy absorbing layer can provide excellent static conductivity and covering protection performance, can reduce the internal resistance of the battery, inhibit the increase of dynamic internal resistance in the charge-discharge cycle process, improve the adhesive force of an active material and a current collector, and reduce the manufacturing cost of the pole piece; polarization is reduced, the multiplying power is improved, and the heat effect is reduced; the electrolyte is prevented from corroding the current collector, and the service life of the battery is prolonged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for manufacturing a quick-charging negative pole piece of a lithium battery and the lithium battery.
The purpose of the invention is realized by the following technical scheme: a method for manufacturing a fast-charging negative pole piece of a lithium battery comprises the following specific manufacturing steps:
step 1: homogenizing, namely adding the negative electrode active material, the binder and the conductive agent into deionized water according to a certain proportion and uniformly dispersing at a high speed to obtain negative electrode slurry;
step 2: pre-coating a conductive carbon layer, and coating conductive carbon black slurry on a negative current collector;
and step 3: coating, namely coating the negative electrode slurry in the step 1 on a negative electrode current collector according to a designed size;
and 4, step 4: baking, namely removing deionized water from the negative current collector in the step 3 through a drying oven to obtain a dry negative pole piece;
and 5: rolling, namely rolling the negative pole piece obtained in the step (4) by a rolling roller;
step 6: and (5) slitting, namely using a slitting machine to cut the negative pole piece in the step (5) into required sizes.
The further technical scheme is that the binder in the step 1 accounts for 0.5-3.5%.
The further technical scheme is that the conductive agent accounts for 0.5-3.5% in the step 1.
According to a further technical scheme, in the step 1, the negative active material is one or more of natural graphite, artificial graphite, soft carbon, hard carbon, silica, silicon carbon, silicon alloy and tin alloy.
The further technical proposal is that the conductive carbon layer in the step 2 is precoated on one side or both sides, and the precoating thickness is 0.1-5 um.
The further technical scheme is that the baking temperature of the negative pole piece in the step 4 is 80-125 ℃.
The further technical proposal is that the surface density of the coating in the step 3 is 50 to 120g/m 2 。
The further technical proposal is that the compaction density of the negative pole piece in the step 5 is 1.3-1.8g/cm 3 。
According to a further technical scheme, the lithium ion battery comprises a positive pole piece, a negative pole piece, an isolation film and electrolyte, wherein the negative pole piece is manufactured according to the manufacturing method of the quick-charging negative pole piece of the lithium ion battery.
The invention has the following advantages:
according to the invention, the appropriate negative electrode surface density is optimized, so that the coating surface density is reduced, the lithium ion transmission distance is favorably shortened, and the migration resistance of lithium ions is reduced; by optimally selecting proper cathode compaction density, a wider lithium ion migration channel is provided, full contact among particles is ensured, the ion migration channel is not blocked, good conductivity of electrons and rapid movement of ions during heavy current discharge are ensured, discharge polarization is reduced, and the voltage of a discharge platform is increased; the current collector is precoated with the conductive carbon layer, so that excellent static conductivity is provided, micro-current of active substances is collected, contact resistance between the positive/negative electrode material and the current collector can be reduced, the adhesion capability between the positive/negative electrode material and the current collector can be improved, the usage amount of the binder is reduced, and the quick charging performance of the battery is improved.
Drawings
FIG. 1 is a schematic diagram of a lithium ion battery of the present invention;
fig. 2 is a cycle life test chart of the lithium ion battery of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to fig. 2, a method for manufacturing a fast-charging negative electrode plate of a lithium battery includes the following specific steps:
step 1: homogenizing, namely adding the negative electrode active material, the binder and the conductive agent into deionized water according to a certain proportion and uniformly dispersing at a high speed to obtain negative electrode slurry;
step 2: pre-coating a conductive carbon layer, and coating dispersed conductive carbon black slurry on a negative current collector;
and step 3: coating, namely coating the negative electrode slurry in the step 1 on a negative electrode current collector according to a designed size;
and 4, step 4: baking, namely removing deionized water from the negative current collector in the step 3 through a drying oven to obtain a dry negative pole piece;
and 5: rolling, namely rolling the negative pole piece obtained in the step (4) by a rolling roller;
step 6: and (5) slitting, namely using a slitting machine to cut the negative pole piece in the step (5) into required sizes.
In this embodiment, the binder in step 1 accounts for 0.5 to 3.5%, and preferably 0.8 to 2.0%.
In this embodiment, the conductive agent in step 1 accounts for 0.5 to 3.5%, and preferably 0.6 to 0.8%.
In this embodiment, the negative electrode active material in step 1 is one or more of natural graphite, artificial graphite, soft carbon, hard carbon, silica, silicon carbon, silicon alloy, and tin alloy.
In this embodiment, the conductive carbon layer in step 2 is pre-coated on one side or both sides, and the pre-coating thickness is 0.1-5um, preferably 0.3-2 um.
In this embodiment, the baking temperature of the negative electrode plate in the step 4 is 80-125 ℃.
In this embodiment, the areal density of the coating in step 3 is 50-120g/m 2 。
In this embodiment, the compacted density of the negative electrode plate in the step 5 is 1.3-1.8g/cm 3 。
In this embodiment, a lithium ion battery includes a positive electrode plate, a negative electrode plate, an isolation film, and an electrolyte, where the negative electrode plate is manufactured according to a manufacturing method of a fast-charging negative electrode plate of a lithium battery.
Table 1 experimental comparison of lithium ion batteries of different specifications
In order to verify the influence of different negative electrode material surface densities, negative electrode compaction densities and precoated conductive carbon layers on the charging efficiency of the lithium ion battery, 10 groups of experiments are performed according to table 1, wherein the maximum allowable charging rate is judged by judging whether lithium is separated from the inside of the battery, and experiments 1-5 show that the maximum allowable charging rate of the manufactured lithium ion battery is increased and the alternating current internal resistance value of the lithium ion battery under the condition of 50% battery capacity (SOC) is reduced along with the reduction of the negative electrode surface density. From experiments 6-9, it can be known that, along with the reduction of the compacted density of the negative electrode, the maximum allowable charging rate of the lithium ion battery is increased, and the alternating current internal resistance value of the lithium ion battery is reduced. Experiments 9-10 show that after the negative pole piece is precoated with the conductive carbon layer, the maximum allowable charging rate of the lithium ion battery is obviously improved, and the alternating current internal resistance is also greatly reduced. Compared with the negative pole piece without the conductive carbon layer precoated, the binding power between the active substance and the current collector is improved by several times, and the resistance of the pole piece can be reduced to 40%.
The rate charging test under the condition of 3 sets of experiments 10 is shown in table 2, and the cycle life test is shown in fig. 2, so that the lithium ion battery under the condition of the experiment 10 has good rate charging performance and cycle life.
TABLE 2 multiplying power charging test table
According to the invention, the appropriate negative electrode surface density is optimized, so that the coating surface density is reduced, the lithium ion transmission distance is favorably shortened, and the migration resistance of lithium ions is reduced; by optimally selecting a proper anode compaction density, a more spacious lithium ion migration channel is provided; by precoating the current collector with the conductive carbon layer, the contact resistance between the negative electrode material and the current collector is reduced, and the adhesion between the negative electrode material and the current collector can be improved. The invention can improve the maximum allowable charging rate of the lithium ion battery and reduce the alternating current internal resistance value of the lithium ion battery, thereby improving the quick charging performance of the lithium ion battery.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A manufacturing method of a fast-charging negative pole piece of a lithium battery is characterized by comprising the following steps: the specific manufacturing steps are as follows:
step 1: homogenizing, namely adding the negative electrode active material, the binder and the conductive agent into deionized water according to a certain proportion and uniformly dispersing at a high speed to obtain negative electrode slurry;
step 2: pre-coating a conductive carbon layer, and coating conductive carbon black slurry on a negative current collector;
and step 3: coating, namely coating the negative electrode slurry in the step 1 on a negative electrode current collector according to a designed size;
and 4, step 4: baking, namely removing deionized water from the negative current collector in the step 3 through a drying oven to obtain a dry negative pole piece;
and 5: rolling, namely rolling the negative pole piece obtained in the step (4) by a rolling roller;
and 6: and (5) slitting, namely using a slitting machine to cut the negative pole piece in the step (5) into required sizes.
2. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the binder in the step 1 accounts for 0.5-3.5%.
3. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the conductive agent in the step 1 accounts for 0.5-3.5%.
4. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: in the step 1, the negative active material is one or more of natural graphite, artificial graphite, soft carbon, hard carbon, silica, silicon carbon, silicon alloy and tin alloy.
5. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the conductive carbon layer in the step 2 is pre-coated on one side or both sides, and the pre-coating thickness is 0.1-5 um.
6. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: and the baking temperature of the negative pole piece in the step 4 is 80-125 ℃.
7. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the surface density of the coating in the step 3 is 50-120g/m 2 。
8. The method for manufacturing the fast-charging negative pole piece of the lithium battery as claimed in claim 1, wherein the method comprises the following steps: the compaction density of the negative pole piece in the step 5 is 1.3-1.8g/cm 3 。
9. The utility model provides a lithium ion battery, includes positive pole piece, negative pole piece, barrier film and electrolyte, its characterized in that: the negative pole piece is manufactured according to the manufacturing method of the lithium battery quick-charging negative pole piece of any one of claims 1 to 8.
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| CN202210840049.2A CN115084449A (en) | 2022-07-18 | 2022-07-18 | Manufacturing method of quick-charging negative pole piece of lithium battery and lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113929188A (en) * | 2020-06-29 | 2022-01-14 | 佛山市顺德区美的饮水机制造有限公司 | Electrode structure, purification structure and electrode preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113929188A (en) * | 2020-06-29 | 2022-01-14 | 佛山市顺德区美的饮水机制造有限公司 | Electrode structure, purification structure and electrode preparation method |
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