CN116995244A - Current collector containing lithium supplementing coating and preparation method and application thereof - Google Patents
Current collector containing lithium supplementing coating and preparation method and application thereof Download PDFInfo
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- CN116995244A CN116995244A CN202310971170.3A CN202310971170A CN116995244A CN 116995244 A CN116995244 A CN 116995244A CN 202310971170 A CN202310971170 A CN 202310971170A CN 116995244 A CN116995244 A CN 116995244A
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- lithium
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 109
- 239000011248 coating agent Substances 0.000 title claims abstract description 78
- 238000000576 coating method Methods 0.000 title claims abstract description 78
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 239000011230 binding agent Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000006258 conductive agent Substances 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 19
- 230000000996 additive effect Effects 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 239000011889 copper foil Substances 0.000 claims description 14
- 239000011888 foil Substances 0.000 claims description 14
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 7
- 159000000007 calcium salts Chemical class 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims 1
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000013543 active substance Substances 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 17
- 238000003756 stirring Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 239000006255 coating slurry Substances 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 229920000058 polyacrylate Polymers 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- 238000006138 lithiation reaction Methods 0.000 description 2
- NCZYUKGXRHBAHE-UHFFFAOYSA-K [Li+].P(=O)([O-])([O-])[O-].[Fe+2].[Li+] Chemical compound [Li+].P(=O)([O-])([O-])[O-].[Fe+2].[Li+] NCZYUKGXRHBAHE-UHFFFAOYSA-K 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses a current collector containing a lithium supplementing coating, a preparation method and application thereof, wherein the current collector containing the lithium supplementing coating consists of a current collector substrate and a lithium containing conductive coating, and the lithium containing conductive coating is uniformly coated on two sides of the current collector substrate; the lithium-containing conductive coating is prepared from the following raw materials in parts by mass: 6-10 parts of conductive agent, 5-8 parts of lithium supplementing agent, 1-2 parts of additive, 13-16 parts of binder and 70-75 parts of dispersing agent. According to the invention, the lithium supplementing agent is introduced into the conductive carbon slurry and coated on the surface of the current collector substrate, so that consumed lithium ions can be well supplemented, the adhesive force between an active substance and the current collector is increased, meanwhile, the internal resistance of a battery is reduced by the conductive carbon slurry, the conductivity, the volume energy density and the battery cycle performance of the battery core are improved, and the defects existing in the conventional lithium supplementing technology are well solved.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a current collector containing a lithium supplementing coating, and a preparation method and application thereof.
Background
At present, lithium ion batteries have become one of the most important energy storage technologies, and then with the rapid development of socioeconomic and science and technology, higher requirements are put on the energy density of lithium ion batteries. In the prior art, two main methods for improving the energy density of lithium ions are as follows: 1) Developing higher energy density battery systems, such as lithium sulfur batteries; 2) The lithium ion battery is improved based on the existing commercial lithium ion system, for example, the pre-lithiation technology is used, so that the loss of active lithium caused by the first charging of the battery can be effectively compensated, and the energy density and the cycle performance of the battery are improved.
The existing lithium supplementing technology is mainly divided into positive electrode lithium supplementing and negative electrode lithium supplementing, and the specific problems are as follows:
(1) The negative electrode lithium supplement is mainly to combine lithium powder or lithium belt with the negative electrode directly to achieve the effect of pre-lithiation. However, the subsequent battery cycle seriously generates heat to influence the bonding force between the active layer and the current collector, so that the active layer is separated; in addition, in the aspect of production trial production, the problems of practical process operability and safety caused by the introduction of metallic lithium are difficult to be properly solved.
(2) The positive electrode lithium supplement generally has the following two modes: the first is to add lithium-containing oxide additive in the process of homogenizing, and as the lithium supplementing agent is mixed with the active material, the volume expansion and shrinkage change of the material are obvious during charging and discharging, the structure collapse is easy to cause, and the capacity attenuation of the cell is accelerated. The second is to coat a conductive carbon layer on the current collector and then coat a lithium supplementing layer to achieve the effect of supplementing lithium, but the stirring and coating procedures of the lithium supplementing slurry are added, so that the process becomes complicated and the manufacturing cost is increased. Secondly, most of lithium supplementing agents have poor conductivity, and the capacity exertion is affected; if the conductive agent layer contacts with the lithium supplementing layer surface, the interface impedance is increased, and more lithium supplementing is needed to be added.
Therefore, an effective lithium supplementing method is needed to solve the defects of the negative electrode lithium supplementing method and the positive electrode lithium supplementing method in the prior art.
Disclosure of Invention
The invention aims to provide a current collector containing a lithium supplementing coating, a preparation method and application thereof, which are used for solving the problems of weak adhesion between the current collector and an active layer in a negative electrode lithium supplementing method, poor conductivity in a positive electrode lithium supplementing method and the like in the prior art.
In order to solve the technical problems, the first solution provided by the present invention is as follows: a current collector containing a lithium supplementing coating consists of a current collector substrate and a lithium containing conductive coating, wherein the lithium containing conductive coating is uniformly coated on two sides of the current collector substrate; the lithium-containing conductive coating is prepared from the following raw materials in parts by mass: 6-10 parts of conductive agent, 5-8 parts of lithium supplementing agent, 1-2 parts of additive, 13-16 parts of binder and 70-75 parts of dispersing agent.
Preferably, the conductive agent is a carbonaceous conductive agent.
Preferably, the lithium supplementing agent is any one or a mixture of a plurality of lithium-containing oxides, lithium-containing fluorides and lithium-containing nitrides.
Preferably, the additive is any one or a mixture of a plurality of inorganic calcium salts and organic calcium salts.
Preferably, the binder is any one or a mixture of a plurality of polyacrylic acid type binder, polyimide type binder, fluorine-containing binder and rubber type binder.
Preferably, the dispersing agent is any one or a mixture of more of NMP and DMF.
Preferably, the current collector substrate is an aluminum foil substrate, the thickness of the lithium-containing conductive coating is 1-10 mu m, and the thickness of the aluminum foil substrate is 8-25 mu m; alternatively, the current collector substrate is a copper foil substrate, the thickness of the lithium-containing conductive coating is 1-10 μm, and the thickness of the copper foil is 4-8 μm.
In order to solve the technical problems, a second solution provided by the present invention is: a method for preparing a current collector containing a lithium supplementing coating, which is used for preparing the current collector containing the lithium supplementing coating in the first solution, and comprises the following preparation steps: the conductive agent, the lithium supplementing agent, the additive, the binder and the dispersing agent are mixed according to the following proportion of (6-10): (5-8): (1-2): (13-16): (70-75) dispersing and homogenizing in proportion to obtain conductive slurry; and uniformly coating the conductive slurry on two sides of a current collector substrate, and drying to form a lithium-containing conductive coating to obtain the current collector with the lithium-supplementing coating.
In order to solve the technical problems, a third solution provided by the present invention is: the application of the current collector containing the lithium supplementing coating in the preparation of the lithium iron phosphate battery in the first solution is specifically that the current collector containing the lithium supplementing coating is applied as an electrode plate in the lithium iron phosphate battery.
The beneficial effects of the invention are as follows: compared with the prior art, the current collector containing the lithium supplementing coating, the preparation method and the application thereof, provided by the invention, have the advantages that the consumed lithium ions can be well supplemented, the adhesive force between the active substances and the current collector is increased, meanwhile, the internal resistance of the battery is reduced by the conductive carbon paste, and the conductivity, the volume energy density and the battery cycle performance of the battery core are improved by introducing the lithium supplementing agent into the conductive carbon paste and coating the conductive carbon paste on the surface of the current collector substrate. The preparation method has the advantages of few procedures, simple process and no increase of manufacturing cost; and the lithium supplementing agent and the conductive agent are mixed preferentially, so that the electronic conductivity of the lithium supplementing agent can be better improved by point-to-point contact, the impedance is reduced, the capacity exertion is improved, and the consumption is reduced.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a current collector with a lithium-compensating coating according to the present invention;
FIG. 2 is a schematic illustration of stirring in one embodiment of a method of preparing a current collector having a lithium-compensating coating according to the present invention;
fig. 3 is a graph showing the cycle performance test of the current collectors obtained in examples 1 and 2 and comparative examples 1 and 2 according to the present invention after being assembled into a lithium iron phosphate battery.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a current collector with a lithium-compensating coating according to the present invention, wherein for a first solution provided by the present invention, the current collector with the lithium-compensating coating is composed of a current collector substrate and a lithium-containing conductive coating, and the lithium-containing conductive coating is uniformly coated on both sides of the current collector substrate; the lithium-containing conductive coating is prepared from the following raw materials in parts by mass: 6-10 parts of conductive agent, 5-8 parts of lithium supplementing agent, 1-2 parts of additive, 13-16 parts of binder and 70-75 parts of dispersing agent.
In a preferred embodiment, the conductive agent is a carbon-containing conductive agent; the lithium supplementing agent is any one or a mixture of a plurality of lithium-containing oxides, lithium-containing fluorides and lithium-containing nitrides; the additive is any one or a mixture of a plurality of inorganic calcium salts and organic calcium salts; the binder is one or a mixture of polyacrylic acid, polyimide type binder, fluorine-containing binder and rubber type binder; the dispersing agent is any one or a mixture of more of NMP and DMF. Wherein, the current collector substrate can be selected from aluminum foil substrate or copper foil substrate, when the current collector substrate is aluminum foil substrate, the thickness of the lithium-containing conductive coating is 1-10 μm, and the thickness of the aluminum foil substrate is 8-25 μm; when the current collector substrate is a copper foil substrate, the thickness of the lithium-containing conductive coating is 1-10 μm, and the thickness of the copper foil is 4-8 μm.
Referring to fig. 2, fig. 2 is a schematic stirring diagram of an embodiment of a method for preparing a current collector with a lithium-compensating coating according to the present invention, and for a second solution provided by the present invention, the method for preparing a current collector with a lithium-compensating coating is used for preparing a current collector with a lithium-compensating coating in the first solution, and the preparation steps thereof are as follows: the conductive agent, the lithium supplementing agent, the additive, the binder and the dispersing agent are mixed according to the following proportion of (6-10): (5-8): (1-2): (13-16): (70-75) dispersing and homogenizing in proportion to obtain conductive slurry; and uniformly coating the conductive slurry on two sides of a current collector substrate, and drying to form a lithium-containing conductive coating to obtain the current collector with the lithium-supplementing coating.
For the third solution provided by the invention, the application of the current collector containing the lithium supplementing coating in the preparation of the lithium iron phosphate battery in the first solution is specifically that the current collector containing the lithium supplementing coating is prepared into an electrode plate, and then the electrode plate is assembled into the lithium iron phosphate battery.
The performance of the aforementioned current collector containing the lithium-compensating coating is tested and analyzed by means of specific examples and comparative examples.
Example 1
The specific preparation steps of the current collector in this embodiment are as follows:
(1) A 15 μm aluminum foil substrate was prepared as a current collector substrate for use.
(2) The carbon coating slurry containing the lithium supplementing agent comprises the following components in percentage by mass: 9 parts of conductive agent, 6 parts of lithium supplementing agent, 2 parts of additive, 16 parts of binder and 72 parts of dispersing agent, and homogenizing and stirring at a high speed to form uniform and stable conductive slurry; wherein the conductive agent is graphite, the lithium supplementing agent is lithium nickelate, the additive is calcium hydroxide, the binder is polyacrylate, and the dispersing agent is NMP.
(3) Feeding an aluminum foil substrate into a gravure coater, coating the conductive slurry, and drying to form a lithium-containing conductive coating to prepare an aluminum foil current collector containing a lithium supplementing coating; wherein the double-sided density of the lithium-containing conductive coating on the surface of the current collector substrate is 3g/m 2 The thickness was 2 μm on both sides and the gram weight of the lithium compensating coating on each surface was the same.
Example 2
The specific preparation steps of the current collector in this embodiment are as follows:
(1) A 6 μm copper foil substrate was prepared as a current collector substrate for standby.
(2) The carbon coating slurry containing the lithium supplementing agent comprises the following components in percentage by mass: 10 parts of conductive agent, 7 parts of lithium supplementing agent, 2 parts of additive, 14 parts of binder and 73 parts of dispersing agent, and homogenizing and stirring at a high speed to form uniform and stable conductive slurry; wherein the conductive agent is graphite, the lithium supplementing agent is lithium nickelate, the additive is calcium hydroxide, the binder is polyacrylate, and the dispersing agent is NMP.
(3) The copper foil base material is sent into a gravure coater, the conductive slurry is coated, and a lithium-containing conductive coating is formed after drying, so that a copper foil current collector containing a lithium supplementing coating is prepared; which is a kind ofThe double-sided density of the lithium-containing conductive coating on the surface of the current collector substrate is 3g/m 2 The thickness was 2 μm on both sides and the gram weight of the lithium compensating coating on each surface was the same.
Comparative example 1
The specific preparation steps of the current collector in this comparative example are as follows:
(1) A 15 μm aluminum foil substrate was prepared as a current collector substrate for use.
(2) The carbon coating slurry containing the lithium supplementing agent comprises the following components in percentage by mass: 6 parts of conductive agent, 2 parts of additive, 16 parts of binder and 77 parts of dispersing agent, and homogenizing and stirring at a high speed to form uniform and stable conductive slurry; wherein the conductive agent is graphite, the additive is calcium hydroxide, the binder is polyacrylate, and the dispersing agent is NMP.
(3) Feeding an aluminum foil substrate into a gravure coater, coating the conductive slurry, and drying to form a conductive coating to prepare an aluminum foil current collector; wherein the double-sided density of the conductive coating on the surface of the current collector substrate is 1g/m 2 The thickness was 1 μm on both sides and the grammage of the conductive coating on each surface was the same.
Comparative example 2
The specific preparation steps of the current collector in this comparative example are as follows:
(1) An 8 μm copper foil substrate was prepared as a current collector substrate for standby.
(2) The carbon coating slurry containing the lithium supplementing agent comprises the following components in percentage by mass: 8 parts of conductive agent, 2 parts of additive, 16 parts of binder and 77 parts of dispersing agent, and homogenizing and stirring at a high speed to form uniform and stable conductive slurry; wherein the conductive agent is graphite, the additive is calcium hydroxide, the binder is polyacrylate, and the dispersing agent is NMP.
(3) The copper foil base material is sent into a gravure coater, the conductive slurry is coated, and a conductive coating is formed after drying, so that a copper foil current collector is prepared; wherein the double-sided density of the conductive coating on the surface of the current collector substrate is 2g/m 2 The thickness was 1 μm on both sides and the grammage of the conductive coating on each surface was the same.
The current collectors prepared in examples 1 and 2 and comparative examples 1 and 2 were prepared into battery pole pieces, assembled into lithium iron phosphate lithium ion batteries, and the charge and discharge properties of the lithium iron phosphate batteries were tested.
Test 1
The first charge and discharge efficiency and the capacity retention rate of the above lithium iron phosphate battery were tested, and the test results are shown in table 1. Example 1 and comparative example 1 are both aluminum foil current collectors, except that no lithium supplement component was introduced in comparative example 1, as can be seen from table 1, example 1 is improved in both of the first charge and discharge efficiency and the 500-time capacity retention rate compared to comparative example 1; example 2 is a copper foil current collector as compared with comparative example 2, except that no lithium supplement component is introduced into comparative example 2, and as can be seen from table 1, example 2 is improved in both of the first charge and discharge efficiency and the 500-time capacity retention rate as compared with comparative example 2.
TABLE 1
| Sequence number | First charge and discharge efficiency | Capacity retention of 500 times |
| Example 1 | 93.23％ | 93.57％ |
| Comparative example 1 | 90.31％ | 90.79％ |
| Example 2 | 94.86％ | 93.45％ |
| Comparative example 2 | 91.05％ | 89.62％ |
Test 2
The cycle performance of the lithium iron phosphate battery is tested under the conditions of 25 ℃ and 0.5 ℃, the test result is shown in fig. 3, and as can be seen from fig. 3, the cycle performance of example 1 is superior to that of comparative example 1, and the cycle performance of example 2 is superior to that of comparative example 2, so that it is proved that the cycle performance of the prepared lithium iron phosphate battery can be improved by introducing the lithium supplementing agent into the conductive paste.
Compared with the prior art, the current collector containing the lithium supplementing coating, the preparation method and the application thereof, provided by the invention, have the advantages that the consumed lithium ions can be well supplemented, the adhesive force between the active substances and the current collector is increased, meanwhile, the internal resistance of the battery is reduced by the conductive carbon paste, and the conductivity, the volume energy density and the battery cycle performance of the battery core are improved by introducing the lithium supplementing agent into the conductive carbon paste and coating the conductive carbon paste on the surface of the current collector substrate. The preparation method has the advantages of few procedures, simple process and no increase of manufacturing cost; and the lithium supplementing agent and the conductive agent are mixed preferentially, so that the electronic conductivity of the lithium supplementing agent can be better improved by point-to-point contact, the impedance is reduced, the capacity exertion is improved, and the consumption is reduced.
It should be noted that, the foregoing embodiments all belong to the same inventive concept, and the descriptions of the embodiments have emphasis, and where the descriptions of the individual embodiments are not exhaustive, reference may be made to the descriptions of the other embodiments.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The current collector with the lithium supplementing coating is characterized by comprising a current collector substrate and a lithium-containing conductive coating, wherein the lithium-containing conductive coating is uniformly coated on two sides of the current collector substrate;
the lithium-containing conductive coating is prepared from the following raw materials in parts by mass: 6-10 parts of conductive agent, 5-8 parts of lithium supplementing agent, 1-2 parts of additive, 13-16 parts of binder and 70-75 parts of dispersing agent.
2. The lithium-compensating coating-containing current collector of claim 1, wherein the conductive agent is a carbon-containing conductive agent.
3. The lithium-containing coated current collector of claim 1, wherein the lithium-supplementing agent is any one or more of a lithium-containing oxide, a lithium-containing fluoride, and a lithium-containing nitride.
4. The lithium-compensating coating-containing current collector of claim 1, wherein the additive is any one or a mixture of inorganic calcium salt and organic calcium salt.
5. The lithium-compensating coating-containing current collector of claim 1, wherein the binder is any one or more of a polyacrylic acid type binder, a polyimide type binder, a fluorine-containing binder, and a rubber type binder.
6. The lithium-compensating coating-containing current collector of claim 1, wherein the dispersant is a mixture of any one or more of NMP, DMF.
7. The current collector with the lithium supplementing coating according to claim 1, wherein the current collector substrate is an aluminum foil substrate, the thickness of the lithium containing conductive coating is 1-10 μm, and the thickness of the aluminum foil substrate is 8-25 μm.
8. The current collector with the lithium supplementing coating according to claim 1, wherein the current collector substrate is a copper foil substrate, the thickness of the lithium containing conductive coating is 1-10 μm, and the thickness of the copper foil is 4-8 μm.
9. A method for preparing a current collector comprising a lithium-compensating coating according to any of claims 1 to 8, comprising the steps of:
the conductive agent, the lithium supplementing agent, the additive, the binder and the dispersing agent are mixed according to the following proportion of (6-10): (5-8): (1-2): (13-16): (70-75) dispersing and homogenizing in proportion to obtain conductive slurry;
and uniformly coating the conductive slurry on two sides of a current collector substrate, and drying to form a lithium-containing conductive coating to obtain the current collector with the lithium-supplementing coating.
10. Use of a current collector comprising a lithium-compensating coating according to any of claims 1 to 8 in the preparation of a lithium iron phosphate battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310971170.3A CN116995244A (en) | 2023-08-01 | 2023-08-01 | Current collector containing lithium supplementing coating and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310971170.3A CN116995244A (en) | 2023-08-01 | 2023-08-01 | Current collector containing lithium supplementing coating and preparation method and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116995244A true CN116995244A (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310971170.3A Pending CN116995244A (en) | 2023-08-01 | 2023-08-01 | Current collector containing lithium supplementing coating and preparation method and application thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN116995244A (en) |
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2023
- 2023-08-01 CN CN202310971170.3A patent/CN116995244A/en active Pending
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