CN115548270A - Processing method of positive pole piece of solid-state lithium battery and lithium battery - Google Patents
Processing method of positive pole piece of solid-state lithium battery and lithium battery Download PDFInfo
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- 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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- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
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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
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- 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
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- H01M4/0435—Rolling or calendering
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Abstract
The invention provides a processing method of a positive pole piece of a solid-state lithium battery and the lithium battery. The method comprises the following steps: mixing a certain proportion of a ternary material of a positive active material, a conductive agent, a binder and a solvent to prepare slurry, and grinding the lithium lanthanum zirconium oxygen powder by a ball milling method to obtain the lithium lanthanum zirconium oxygen powder with uniform particles and micron-sized particle size. Mixing a certain proportion of polyvinylidene fluoride-co-hexafluoropropylene, micron-sized lithium lanthanum zirconium oxide, glass fiber and DMF solvent to prepare coating slurry. And coating the processed composite material coating slurry on the surface of a ternary material positive electrode plate prepared in advance to form the positive electrode plate with the composite material coating. The positive pole piece obtained by the technical scheme can effectively increase the conductivity of the lithium battery with the positive pole piece, effectively reduce the weight of the battery and improve the volume energy density of the battery, and prevent the problems of short circuit and the like caused by the fact that lithium dendrites generated by the lithium battery in the circulating process penetrate through a diaphragm.
Description
Technical Field
The invention relates to the technical field of vehicle batteries, in particular to a processing method of a positive pole piece of a solid-state lithium battery and the lithium battery.
Background
As a secondary battery, a lithium ion battery has the advantages of high voltage, large specific energy, long cycle life, small self-discharge, and the like, and has been widely used in the fields of mobile phones, new energy vehicles, and the like. However, lithium ions are precipitated due to defects in the battery manufacturing process and problems of daily improper use, and lithium dendrites are generated to cause safety problems such as short-circuit ignition of the battery. The lithium battery adopting the solid electrolyte has the advantages of no toxicity, low inflammability, no volatilization, high stability and the like, and can solve the problems that an SEI film and lithium dendrites generated in the charging and discharging processes of the lithium battery puncture a diaphragm and the like, thereby greatly improving the safety performance of the battery and solving the problem that the lithium battery is inflammable and explosive. However, the problems of difficult batch production, poor lithium ion conductivity, shrinkage of organic polymers after imbibing liquid and the like exist at present, and the application of the solid lithium battery is seriously influenced.
Disclosure of Invention
The invention mainly aims to provide a processing method of a solid-state lithium battery positive pole piece and a lithium battery, and solves the problem of potential safety hazard of the lithium battery in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for processing a positive electrode sheet, including: mixing a positive electrode active substance ternary material, a conductive agent, a binder and a solvent according to a certain proportion to prepare slurry, wherein the mass ratio of the positive electrode active substance ternary material to the binder to the conductive agent is 8 0.8 Co 0.1 Mn 0.1 O 2 Polycrystalline LiNi 0.8 Co 0.1 Mn 0.1 O 2 And single crystal LiNi 0.5 Co 0.2 Mn 0.3 O 2 Polycrystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 And single crystal LiNi 0.33 Co 0.33 Mn 0.33 O 2 Polycrystalline LiNi 0.33 Co 0.33 Mn 0.33 O 2 The conductive agent is at least one of acetylene black, carbon nano tubes and Ketjen black; uniformly coating the prepared slurry on an aluminum foil current collector, drying in an oven at 40-80 ℃, and rolling to obtain a lithium ion battery anode electrode; grinding the lithium lanthanum zirconium oxide powder by a ball milling method to obtain the lithium lanthanum zirconium oxide powder with uniform particles and micron-sized particle size; mixing a certain proportion of polyvinylidene fluoride-co-hexafluoropropylene, micron-sized lithium lanthanum zirconium oxide, glass fiber and DMF solventPreparing coating slurry; coating the processed composite material coating slurry on the surface of the ternary material positive electrode plate prepared in step S02 in advance to form a positive electrode plate with the composite material coating slurry; punching the positive pole piece to form a positive pole piece with a certain diameter, placing the positive pole piece in a vacuum oven, and baking the positive pole piece for a preset time at a preset temperature value to remove moisture and solvent, thereby obtaining a target positive pole piece.
Further, the solvent is N-methyl-2-pyrrolidone.
Further, the binder is one or a mixture of polyvinylidene fluoride, polyvinylidene fluoride-co-hexafluoropropylene, polymethyl methacrylate, polyacrylonitrile and poly-m-phenylene isophthalamide.
Further, configuring a composite coating slurry comprises: polyvinylidene fluoride-co-hexafluoropropylene and N, N-dimethylformamide are mixed according to a mass ratio of 90:1000, mixing in a glass container, and stirring at a certain temperature for a preset time to obtain a uniform and transparent glue solution A; adding lithium lanthanum zirconium oxide and glass fiber with different masses into the uniform and transparent glue solution A, and stirring at a certain temperature for a preset time to obtain uniform coating slurry.
Further, the mass ratio of polyvinylidene fluoride-co-hexafluoropropylene, lithium lanthanum zirconium oxide, glass fiber and N, N-dimethylformamide is 90:10:1:1000.
further, the thickness of the composite material coating slurry on the positive pole piece is 8-12 μm.
According to another aspect of the present invention, a lithium battery is provided, which includes a positive electrode plate, and the positive electrode plate is processed by the processing method of the positive electrode plate of the solid-state lithium battery.
Furthermore, the lithium battery comprises a lithium battery positive electrode shell, a lithium battery negative electrode shell, and a stainless steel gasket, a lithium sheet and a positive electrode sheet which are arranged between the positive electrode shell and the negative electrode shell.
By applying the technical scheme of the invention, the ternary material of the positive active substance, the conductive agent, the binder and the solvent are mixed according to a certain proportion, dried in an oven at the temperature of 40-80 ℃, and then rolled to obtain the positive electrode of the lithium ion battery. And preparing composite material coating slurry to coat the composite material coating slurry on a battery positive electrode to form a positive electrode piece with the composite material coating slurry, punching the positive electrode piece to form a positive electrode piece with a certain diameter, placing the positive electrode piece in a vacuum oven, and baking for a preset time at a preset temperature value to remove moisture and solvent, thereby obtaining a target positive electrode piece. The positive pole piece obtained by the method can effectively increase the conductivity of the lithium battery with the positive pole piece, effectively reduce the weight of the battery, improve the volume energy density of the battery, and prevent the problems of short circuit and the like caused by the fact that lithium dendrites generated in the cycle process of the lithium battery penetrate through a diaphragm.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a graph of the cycling capacity at 100 cycles for various embodiments of a button half cell according to the invention;
fig. 2 is a schematic diagram of an alternative solid state lithium battery according to an embodiment of the present invention;
fig. 3 is a graph of the cycling capacity at different rates of button half cells made according to different embodiments of the invention;
fig. 4 is a flowchart of an alternative method for processing a positive electrode tab of a solid-state lithium battery according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a negative electrode case; 11. a stainless steel gasket; 12. a lithium sheet; 13. coating slurry; 14. electrode paste; 15. aluminum foil; 16. a positive electrode case; 17. and (3) a positive pole piece.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
Referring to fig. 1 to 4, according to an embodiment of the present disclosure, a method for processing a positive electrode plate of a solid-state lithium battery is provided.
Specifically, as shown in fig. 4, a processing method of a positive electrode plate includes: step by stepStep S01: mixing a positive electrode active substance ternary material, a conductive agent, a binder and a solvent according to a certain proportion to prepare slurry, wherein the mass ratio of the positive electrode active substance ternary material to the binder to the conductive agent is 8 0.8 Co 0.1 Mn 0.1 O 2 Polycrystalline LiNi 0.8 Co 0.1 Mn 0.1 O 2 And single crystal LiNi 0.5 Co 0.2 Mn 0.3 O 2 Polycrystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 And single crystal LiNi 0.33 Co 0.33 Mn 0.33 O 2 Polycrystalline LiNi 0.33 Co 0.33 Mn 0.33 O 2 The conductive agent is at least one of acetylene black, carbon nano tubes and Ketjen black; step S02: uniformly coating the slurry prepared in the step S01 on a current collector of an aluminum foil 15, drying in an oven at 40-80 ℃, and then rolling to obtain a positive electrode of the lithium ion battery; step S03: grinding of inorganic solid electrolyte: grinding the lithium lanthanum zirconium oxide powder by a ball milling method to obtain the lithium lanthanum zirconium oxide powder with uniform particles and micron-sized particle size; step S04: preparing composite material coating slurry: mixing polyvinylidene fluoride-co-hexafluoropropylene in a certain proportion, micron-sized lithium lanthanum zirconium oxide, glass fiber and a DMF solvent to prepare coating slurry; step S05: coating the composite material coating slurry processed in the step S04 on the surface of the ternary material positive electrode piece prepared in advance in the step S02 to form a positive electrode piece with the composite material coating slurry; step S06: and punching the positive pole piece to form the positive pole piece with a certain diameter, and placing the positive pole piece in a vacuum oven to be baked for a preset time at a preset temperature value so as to remove moisture and solvent, thereby obtaining the target positive pole piece.
In the embodiment, a positive electrode active substance ternary material, a conductive agent, a binder and a solvent in a certain proportion are mixed, dried in an oven at 40-80 ℃, and then rolled to obtain the positive electrode of the lithium ion battery. And preparing composite material coating slurry to coat the composite material coating slurry on a battery positive electrode to form a positive electrode plate with the composite material coating slurry, punching the positive electrode plate to form a positive electrode plate with a certain diameter, placing the positive electrode plate in a vacuum oven, and baking for a preset time at a preset temperature value to remove moisture and solvent, so as to obtain the target positive electrode plate. The positive pole piece prepared by the method can increase the conductivity of the lithium battery, effectively reduce the weight of the battery, improve the volume energy density of the battery, and prevent the problems of short circuit and the like caused by the fact that the lithium dendrite generated in the cycle process of the lithium battery penetrates through the diaphragm.
Further, the solvent is N-methyl-2-pyrrolidone.
Further, the binder is one or a mixture of polyvinylidene fluoride, polyvinylidene fluoride-co-hexafluoropropylene, polymethyl methacrylate, polyacrylonitrile and poly-m-phenylene isophthalamide. In the embodiment, the binder is preferably PVDF-HFP material, so that the positive electrode has large lithium ion conductivity, and better flexibility and cycle performance.
Further, configuring the composite coating slurry comprises: polyvinylidene fluoride-co-hexafluoropropylene and N, N-dimethylformamide are mixed according to a mass ratio of 90:1000, mixing in a glass container, and stirring at a certain temperature for a preset time to obtain a uniform and transparent glue solution A; adding lithium lanthanum zirconium oxide and glass fiber with different masses into the uniform and transparent glue solution A, and stirring at a certain temperature for a preset time to obtain uniform coating slurry. In this example, gum A was obtained by stirring at a temperature of 60 ℃ for 12 h. The adopted inorganic solid electrolyte can provide higher lithium ion conductivity, and can make up for the defect of low lithium ion conductivity of the organic polymer solid electrolyte; the adopted organic polymer can improve the solid-solid interface contact problem between the anode, the solid electrolyte and the cathode and increase the contact active sites for lithium ion conduction; the glass fiber can further improve the heat resistance of the composite material coating slurry, improve the electronic insulating property of the coating and reduce the risk of short circuit. In addition, the glass fiber in the composite coating can form a three-dimensional network structure, inhibit the shrinkage problem caused by the organic polymer after imbibing, and ensure that the composite material coating slurry has better mechanical property and structural stability.
Further, the mass ratio of polyvinylidene fluoride-co-hexafluoropropylene, lithium lanthanum zirconium oxide, glass fiber and N, N-dimethylformamide is 90:10:1:1000. the setting effectively lightens the weight of battery and improves the volume energy density of battery like this, improves the electron insulating properties of coating, reduces the risk of short circuit. As shown in Table 1, the PVDF-HFP was used in the component ratio: LLZO: the mass ratio of the glass fiber is 90:10:1, thickness examples of different composite coating slurries and their first charge-discharge relationship:
TABLE 1
Further, the thickness of the composite material coating slurry on the positive pole piece is 8-12 μm. The coating thickness is preferably 10 μm, and as shown in table 2, the ratio of each material component and the first charge-discharge relationship thereof under the condition of the coating thickness of 10 μm:
TABLE 2
In another embodiment of the present application, the slurry is prepared in step S01 as follows: dissolving a binder in a solvent, stirring to obtain a uniformly mixed glue solution, adding a certain proportion of a conductive agent and a positive active material, and uniformly mixing and stirring to obtain a slurry.
Coating, drying and rolling treatment of the lithium ion battery anode electrode: and (4) uniformly coating the slurry prepared in the step (S01) on an aluminum foil 15 current collector, drying in an oven at the temperature of 40-80 ℃, and rolling to obtain the lithium ion battery anode. The current collector is preferably a 12 μm aluminum foil 15.
Grinding of inorganic solid electrolyte: the Lithium Lanthanum Zirconium Oxide (LLZO) powder is ground for 4 hours by a ball milling method to obtain ultrafine powder with uniform particles and micron-sized size. Wherein the LLZO component can be replaced by an oxide solid electrolyte known in the art such as Lithium Lanthanum Titanium Oxide (LLTO).
The preparation method of the slurry in the step S04 is as follows: PVDF-HFP and N, N-Dimethylformamide (DMF) are mixed according to the mass ratio of 90:1000 in a glass vessel and stirred at 60 ℃ for 12h to give a homogeneous and transparent gum solution A. Adding LLZO and glass fiber with different masses into the glue solution A and stirring for 12h at 60 ℃ to obtain uniform coating slurry. The optimal mixture ratio is PVDF-HFP: LLZO: glass fiber: the mass ratio of DMF is 90:10:1:1000.
processing the positive pole piece with the composite material coating slurry: and punching the positive pole piece in a punching machine to form the positive pole piece with the diameter of 12 mm. And placing the electrode piece in a vacuum oven for vacuum drying for 48 hours at the temperature of 60 ℃ to remove moisture and solvent, and then transferring the electrode piece into a glove box for later use.
In this embodiment, the lithium battery can be manufactured by using the positive electrode plate processed by the above method, wherein the lithium battery is a 2025 type button battery, and specifically, the button battery is composed of the lithium plate 12 and the positive electrode plate with the composite material coating slurry.
In another embodiment of the present application, a lithium battery is provided, where the lithium battery includes a positive electrode plate, and the positive electrode plate is processed by the above-mentioned processing method for the positive electrode plate of the solid-state lithium battery. The solid-state lithium ion battery has the best safety performance under the condition of having the best electrochemical performance. By controlling the component proportion change and the coating thickness of the composite material coating slurry, the synergistic effect among materials can be fully exerted, so that the battery has high energy density and high safety performance, and the manufacturing process is close to the existing lithium ion battery production process, thereby being suitable for mass production.
As shown in fig. 2, the lithium battery includes a positive electrode can 16, a negative electrode can 10, and a stainless steel gasket 11, a lithium sheet 12, and a positive electrode sheet disposed between the positive electrode can 16 and the negative electrode can 10. In this embodiment, the specific assembly mode is from bottom to top according to the button cell processing mode: battery positive electrode can 16/processed positive electrode tab 17/lithium tab 12/gasket/battery negative electrode can 10 as described above. And corresponding performance tests and evaluations were performed on the processed lithium ion solid state battery having the organic-inorganic composite solid electrolyte/glass fiber composite coating slurry. The processed lithium ion battery positive electrode composite pole piece can be assembled with graphite, silicon carbon negative electrodes, lithium titanate and other negative electrode pole pieces to form a full battery test, and the full battery can comprise models such as soft packs, cylinders or square shells.
In another embodiment of the present application, the processing of lithium ion solid state batteries and the processing of button batteries thereof: firstly weighing 25g of PVDF-HFP, adding the PVDF-HFP into 1L of NMP, stirring for 3 hours to obtain colorless transparent glue solution, then adding 200g of ternary positive electrode and 25g of conductive carbon black, quickly stirring for 4 hours to obtain uniformly mixed black slurry, measuring the viscosity by using a viscometer to ensure that the viscosity is about 7000 to 10000cps and the fineness is below 30 mu m, and sieving by using a 160-mesh double-layer filter screen. Finally, electrode paste: adhesive: the mass ratio of the conductive agent is 8:1:1, coating the obtained electrode slurry 14 on an aluminum foil 15 with the thickness of 12 microns, drying in an oven at 60 ℃ and rolling for standby. Grinding Lithium Lanthanum Zirconium Oxide (LLZO) powder for 4 hours by a ball milling method to obtain ultrafine powder with uniform particles and micron-sized size. 90g of PVDF-HFP was weighed into 1000g of DMF solution and stirred at 60 ℃ for 12 hours to give a transparent gum solution, denoted as gum solution A. And (3) adding 1g of the ground LLZO powder and 1g of glass fiber into the glue solution A, mixing, and stirring at 60 ℃ for 12 hours to obtain uniformly mixed coating slurry 13. The coating slurry is coated on the surface of a prepared ternary positive pole piece and dried in an oven at 80 ℃ for 12 hours to obtain a positive pole electrode with the coating thickness of 10 mu m. And punching the pole piece in a punching machine to form a positive pole piece 17 with the diameter of 12 mm. And placing the electrode piece in a vacuum oven for vacuum drying for 48 hours at the temperature of 60 ℃ to remove moisture and solvent, and then transferring the electrode piece into a glove box for later use. Packaging the button cell: the pole piece and the lithium piece 12 of the embodiment are assembled in a stacking manner of the battery positive electrode shell 16/the processed positive electrode pole piece 17/the lithium piece 12/the gasket/the battery negative electrode shell 10, and finally, the battery is pressed under a press machine to form the 2025 type button battery.
In another embodiment of the present application, as shown in fig. 1 and fig. 3, when the mass of the added LLZO powder becomes 10g, the lithium ion battery positive electrode sheet 17 and its corresponding 2025 type button battery are finally obtained. The corresponding cell still had a maximum discharge capacity of 187.46mAh/g and a maximum coulombic efficiency of 99.9% after 100 cycles. Still have the highest discharge capacity 164.2mAh/g and the best coulomb efficiency 99.8% under the higher rate (1000 mA/g), after the test current is recovered to 100mA/g, its discharge capacity can also be kept at 97.78% of the initial discharge capacity value.
In another embodiment of the present application, when the mass of the added LLZO powder becomes 10g, 2g of glass fiber is added at the same time, and finally the lithium ion battery positive pole piece 17 and its corresponding 2025 type button battery are obtained.
In another embodiment of the present application, after the coating slurry is coated on the surface of the ternary positive electrode sheet and dried, the positive electrode with the coating thickness of 12 μm is obtained, and finally the lithium ion battery positive electrode sheet 17 and the corresponding 2025 type button battery thereof are obtained.
In another embodiment of the present application, the coating slurry is coated on the surface of the ternary positive electrode sheet and dried to obtain a positive electrode with a coating thickness of 8 μm, and finally the lithium ion battery positive electrode sheet 17 and the corresponding 2025 type button battery are obtained.
For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A processing method of a solid-state lithium battery positive pole piece is characterized by comprising the following steps:
mixing a positive electrode active substance ternary material, a conductive agent, a binder and a solvent according to a certain proportion to prepare slurry, wherein the mass ratio of the positive electrode active substance ternary material to the binder to the conductive agent is (8) 0.8 Co 0.1 Mn 0.1 O 2 Polycrystalline LiNi 0.8 Co 0.1 Mn 0.1 O 2 And single crystal LiNi 0.5 Co 0.2 Mn 0.3 O 2 Polycrystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 And single crystal LiNi 0.33 Co 0.33 Mn 0.33 O 2 Polycrystalline LiNi 0.33 Co 0.33 Mn 0.33 O 2 At least one of lithium iron phosphate, lithium manganese iron phosphate, lithium cobaltate, lithium manganate and lithium nickelate, wherein the conductive agent is selected from acetylene black, carbon nano tube and Ketjen blackOne kind of the compound is used;
uniformly coating the prepared slurry on an aluminum foil current collector, drying in an oven at 40-80 ℃, and rolling to obtain a lithium ion battery anode electrode;
grinding the lithium lanthanum zirconium oxide powder by a ball milling method to obtain the lithium lanthanum zirconium oxide powder with uniform particles and micron-sized particle size;
mixing a certain proportion of polyvinylidene fluoride-co-hexafluoropropylene, micron-sized lithium lanthanum zirconium oxide, glass fiber and a DMF solvent to prepare coating slurry;
coating the processed composite material coating slurry on the surface of a ternary material positive electrode plate prepared in advance to form a positive electrode plate with the composite material coating slurry;
and punching the positive pole piece to form a positive pole piece with a certain diameter, and placing the positive pole piece in a vacuum oven to be baked for a preset time at a preset temperature value so as to remove moisture and solvent, thereby obtaining the target positive pole piece.
2. The process of claim 1, wherein the solvent is N-methyl-2-pyrrolidone.
3. The process of claim 1, wherein the binder is one or more of polyvinylidene fluoride, polyvinylidene fluoride-co-hexafluoropropylene, polymethyl methacrylate, polyacrylonitrile, and poly-m-phenylene isophthalamide.
4. The process of claim 1, wherein disposing a composite coating slurry comprises:
polyvinylidene fluoride-co-hexafluoropropylene and N, N-dimethylformamide are mixed according to a mass ratio of 90:1000, mixing in a glass container, and stirring at a certain temperature for a preset time to obtain a uniform and transparent glue solution A;
adding lithium lanthanum zirconium oxide and glass fiber with different masses into the uniform and transparent glue solution A, and stirring at a certain temperature for a preset time to obtain uniform coating slurry.
5. The process according to claim 4, wherein the mass ratio of polyvinylidene fluoride-co-hexafluoropropylene, lithium lanthanum zirconium oxide, glass fiber, N-dimethylformamide is 90:10:1:1000.
6. the processing method according to claim 1, wherein the thickness of the composite material coating slurry on the positive electrode sheet is between 8 and 12 μm.
7. A lithium battery, comprising a positive electrode plate, characterized in that the positive electrode plate is processed by the processing method of any one of claims 1 to 6.
8. The lithium battery of claim 7, comprising a positive casing, a negative casing, and a stainless steel gasket, a lithium sheet, and the positive electrode sheet disposed between the positive casing and the negative casing.
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| CN202211303034.9A Pending CN115548270A (en) | 2022-10-24 | 2022-10-24 | Processing method of positive pole piece of solid-state lithium battery and lithium battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116393343A (en) * | 2023-04-12 | 2023-07-07 | 燕山大学 | Lithium battery pole piece drying equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116393343A (en) * | 2023-04-12 | 2023-07-07 | 燕山大学 | Lithium battery pole piece drying equipment |
| CN116393343B (en) * | 2023-04-12 | 2023-11-07 | 燕山大学 | Lithium battery pole piece drying equipment |
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