CN115632102A - Pole piece coating structure and method - Google Patents

Pole piece coating structure and method Download PDF

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Publication number
CN115632102A
CN115632102A CN202110208089.0A CN202110208089A CN115632102A CN 115632102 A CN115632102 A CN 115632102A CN 202110208089 A CN202110208089 A CN 202110208089A CN 115632102 A CN115632102 A CN 115632102A
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China
Prior art keywords
active material
coating
layer
drying
pole piece
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CN202110208089.0A
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Chinese (zh)
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宫士鼎
张芹
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Xiamen Hithium Energy Storage Technology Co Ltd
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Xiamen Hithium Energy Storage Technology Co Ltd
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Priority to CN202110208089.0A priority Critical patent/CN115632102A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • 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
    • 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
    • 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
    • H01M2004/029—Bipolar electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

A pole piece coating structure and a pole piece coating method belong to the field of batteries. The coating method comprises the following steps: providing a first active material and a second active material with opposite polarities, wherein the drying temperature of the first active material is greater than or equal to the drying temperature of the second active material; and coating the first active material on the surface of the first conductive layer with the same polarity as the first active material and drying the first active material, and coating the second active material on the surface of the second conductive layer with the same polarity as the second active material and drying the second active material. The coating method is simple and easy to implement.

Description

Pole piece coating structure and method
Technical Field
The application relates to the field of batteries, in particular to a pole piece coating structure and a pole piece coating method.
Background
In the battery industry, conventionally, the pole piece manufacturing process is usually performed by a cold pressing process. That is, after coating a slurry mainly including an active material on a current collector, roll pressing is performed. Further, since the positive electrode tab and the negative electrode tab are two independent members, the positive electrode tab and the negative electrode tab are manufactured by cold pressing separately and independently.
Disclosure of Invention
The application provides a pole piece coating structure and a pole piece coating method aiming at the problem that a composite current collector integrating a positive pole and a negative pole cannot be manufactured through the existing process.
The application is realized as follows:
in a first aspect, examples of the present application provide a pole piece coating method. The pole piece comprises a current collector, and the current collector comprises an insulating support body, and a first conducting layer and a second conducting layer which are respectively formed on the surfaces of the two sides of the current collector and have opposite polarities. The coating method comprises the following steps: providing a first active material and a second active material with opposite polarities, wherein the drying temperature of the first active material is greater than or equal to the drying temperature of the second active material; and coating the first active material on the surface of the first conductive layer with the same polarity as the first active material and drying the first active material, and coating the second active material on the surface of the second conductive layer with the same polarity as the second active material and drying the second active material.
In some examples of the present application, a coating method comprises: a tabletting step performed after coating the first active material and drying, and before coating the second active material.
In some examples of the present application, the sheeting step is accomplished by cold pressing using rollers.
In some examples of the present application, the curling of the current collector is suppressed by adjusting the compacted density of the first active material during the performing step.
In some examples of the present application, the compacted density is determined by an areal density of the first active material.
In some examples of the present application, the coating operation and the drying operation are performed simultaneously.
In some examples of the present application, the drying operation is performed by passing hot air through an oven.
In some examples of the present application, the speed of coating the first active material and the speed of coating the second active material are independently controlled in a first range, and the frequency of the hot air for drying the first active material and the frequency of the hot air for drying the second active material are independently controlled in a second range.
In some examples of the present application, the first active material has a viscosity of 3000 to 8000mPa·S -1 The viscosity of the second active material is 4000 to 8000mPa S -1 The speed of coating the first active material and the speed of coating the second active material are respectively independent and are controlled between 5 and 20m/min, the air frequency of hot air for drying the first active material and the air frequency of hot air for drying the second active material are respectively independent and are controlled between 15 and 50m/min, the drying temperature of the first active material is 90 to 110 ℃, and the drying temperature of the second active material is 60 to 90 ℃.
In a second aspect, examples of the present application propose a pole piece coating structure comprising: the composite current collector is provided with an insulating film layer, and a first conducting layer and a second conducting layer which are respectively formed on the surfaces of two sides of the insulating film layer and have opposite polarities; a dried first active material layer attached to a surface of the first conductive layer; a dried second active material layer attached to a surface of the second conductive layer, the second active material layer having a polarity opposite to that of the first active material layer.
In some examples of the present application, the thickness of the insulating film layer is greater than the thickness of the first conductive layer and the thickness of the second conductive layer, respectively; alternatively, the dried second active material layer has a compacted density of 1.0 to 2.2g/cm 3 (ii) a Alternatively, the surface of the second active material layer is flat.
In some examples of the present application, the first conductive layer is an aluminum layer.
In some examples of the present application, the second conductive layer is a copper layer.
In some examples of the present application, the insulating film layer is a polyethylene film layer, a polypropylene film layer, or a polyimide film layer.
In the implementation process, the pole piece coating method provided by the embodiment of the application selects a proper coating mode on the basis of the composite current collector (bipolar current collector) simultaneously provided with the positive conductive layer and the negative conductive layer, so that the traditional coating concept is changed, and a new coating mode is realized. The scheme is suitable for the bipolar current collector, so that the scheme for manufacturing the bipolar pole piece is possible.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a composite current collector proposed in an embodiment of the present application;
fig. 2 illustrates a structural variation after forming a positive active material on the surface of the positive conductive layer of the composite current collector of fig. 1 and a first cold pressing;
fig. 3 illustrates a structural variation after forming a positive active material on the surface of the positive conductive layer of the composite current collector of fig. 1 and a second cold pressing;
fig. 4 is a schematic view of a pole piece coating process based on a composite current collector in the embodiment of the present application.
Icon: 100-a composite current collector; 101-a polymer film; 102-an aluminum layer; 103-a copper layer; 203-first active material.
Detailed Description
The conventional positive electrode plate and negative electrode plate, which are separately manufactured, are affected by the volume and thickness of the battery case. In addition, since these electrode sheets generally use metal foils such as copper foil and aluminum foil, the thickness of these electrode sheets is large, so that the number of winding layers is small, and the design of the capacity of the battery based on the electrode sheets is limited.
Based on the current state analysis, in order to improve the battery capacity, the thickness of the pole piece can be reduced, so that the battery core with more winding layers can be installed under the condition of the same battery case capacity and thickness.
Based on this, select to use compound mass flow body in this application example, consequently, adopt this compound mass flow body can make compound pole piece to accomplish the pole piece thinner, the number of winding layers is more under the condition of current battery case volume, thereby reaches the requirement that promotes capacity under the condition of messenger's same battery case volume.
In addition, in consideration of the manufacturing method of the pole piece, a new manufacturing process of the novel battery pole piece using the composite current collector is correspondingly developed, in particular to improvement of a coating mode aiming at the composite current collector.
In order to make the present solution more clearly and easily implemented by those skilled in the art, the structure of the composite current collector 100 in the example is shown in fig. 1.
The composite current collector 100 includes a polymer film 101 (or an insulating support), and an aluminum layer 102 and a copper layer 103 respectively disposed on two side surfaces of the polymer film 101. The copper layer 103 is present as a negative structural layer and the aluminum layer 102 is present as a positive structural layer.
The polymer film 101 may be made of PET, PP, PI, or the like, i.e., a polyethylene film, a polypropylene film, or a polyimide film. The polymer film 101 is insulating to electrically isolate the copper layer 103 from the aluminum layer 102. The copper layer 103 and the aluminum layer 102 can be formed by chemical vapor deposition, and the thickness thereof is generally smaller than that of the polymer film 101.
The manner of coating the electrode sheet of the composite current collector 100 having the above-described structure will be described below.
Since the composite current collector has a positive conductive layer (hereinafter, referred to as a first conductive layer) and a negative conductive layer (hereinafter, referred to as a second conductive layer), the coating method in the present example is to form a positive active material layer (hereinafter, referred to as a first active material) on the positive conductive layer and a negative active material layer (hereinafter, referred to as a second active material) on the negative conductive layer.
The anode active material can be selected from lithium iron phosphate, ternary lithium, lithium manganate, lithium cobaltate and the like; the negative active material can be graphite, silicon carbon, lithium titanate and the like. In a particular process the above materials are formulated as a slurry for coating. For example, an active material such as lithium iron phosphate (e.g., lithium iron phosphate, lithium manganate, lithium cobaltate, ternary etc.), a conductive agent (e.g., SP, CNTs, etc.), and a binder (e.g., PVDF, etc.) are mixed to form a viscous slurry. Alternatively, an active material such as graphite (graphite, silicon carbon, lithium titanate, etc.), a conductive agent (such as SP, CNTs, graphene, etc.), and a binder (CMC, SBR, etc.) are mixed to form a viscous slurry.
Generally, the first active material and the second active material coated in the present application are selected according to respective drying temperatures. And, the above-mentioned first active material and second active material are coated in different steps by steps, see fig. 4.
Scheme one
For example, when the drying temperature of the first active material is greater than or equal to the drying temperature of the second active material, the first active material is coated first, and after it is dried, the second active material is coated and dried. It is noted that in the coating operation, the conductive layer and the active material of the same polarity are combined. That is, the surface of the conductive layer with positive polarity (such as aluminum) is coated with an active material with positive polarity (such as lithium iron phosphate).
Scheme two
In other examples, rolling (e.g., cold pressing) may also be combined in the step-coating of active materials of different polarities. For example, when the drying temperature of the first active material is greater than or equal to the drying temperature of the second active material, the first active material is coated first, and the first active material is cold-pressed after being dried; then, the second active material is coated and dried.
In the above example, since the first embodiment performs the coating and drying operations, the operation is relatively simple.
In the second embodiment, a cold pressing operation (tabletting step) is also performed, and is performed before the second coating. The cold pressing operation can affect the stress condition of the coated active material, even cause the curling condition of the film material, thereby seriously affecting the normal operation of the second coating. Therefore, special consideration needs to be given to the cold pressing operation. In an example, the step of compressing is performed by adjusting a compaction density of the first active material to suppress curling of the current collector. I.e., avoid excessive compression of the first active material, thereby inhibiting the first active material from curling the composite current collector.
Also, in practice, if the compaction density of the cold pressing operation is not properly selected, it can result in curling of the cold pressed side toward the uncoated side. For example, after a positive electrode active material is coated on a positive electrode layer on the composite current collector and subjected to improper cold pressing, the positive electrode side is curled toward the negative electrode side. Referring to fig. 2, a first active material 203 is coated on a composite current collector, dried and subjected to a suitable cold pressing operation (e.g., a compaction density of 1.0 to 2.2 g/cm) 3 ) Thereafter, the thickness of the first active material 203 becomes thinner relative to the thickness after coating and drying, and the whole thereof can still maintain a flat structure. If the first active material 203 is coated and dried, an improper cold pressing operation (e.g., a compaction density greater than 2.2 g/cm) is used 3 ) This will result in the overall structure curling and not remaining flat as shown in figure 3. In fig. 3, improperly cold-pressed first active material 203 is rolled inward, thereby positioning the negative conductive layer (e.g., copper layer 103) at the innermost turn layer.
In the above coating scheme, the active material is dried after coating, which is based on the active material being made in the form of slurry and containing solvents, plasticizers, etc., so that the drying process can remove the solvents, plasticizers, etc., to avoid the potential adverse effect of these substances on the electrode, and make the active material more prone to adhere to the surface of the composite current collector. Generally, the coating operation and the drying operation may be performed simultaneously. For example, coating operations are carried out in heated equipment. The coating operation was performed using an oven with a coating apparatus.
As an alternative embodiment, the first coating means may be implemented as follows.
Step 11, preparing electrode material
The viscosity of the first active material (positive electrode) is 3000 to 8000 mPa.S -1 The drying temperature is 90 to 110 ℃; the viscosity of the second active material (negative electrode) is 4000 to 8000 mPa.S -1 The drying temperature is 60 to 90 ℃. The positive electrode slurry specifically comprises lithium iron phosphate, superfine conductive carbon black and polyvinylidene fluoride. Negative electrode slurryThe material comprises graphite, superfine conductive carbon black and sodium carboxymethyl cellulose.
Step 12, coating of positive electrode
The coating speed is selected to be 5-20m/min, the oven temperature is 90-110 ℃, and the wind frequency is 15-50m/min.
Step 13, coating of negative electrode
The coating speed is selected to be 5-20m/min, the temperature of the oven is 60-90 ℃, and the air frequency is 15-20m/min.
Alternatively, the second coating method may be performed as follows.
Step 21, preparing electrode material
The viscosity of the first active material (positive electrode) is 3000 to 8000 mPa.S -1 The drying temperature is 90 to 110 ℃; the viscosity of the second active material (negative electrode) is 4000 to 8000 mPa.S -1 The drying temperature is 60 to 90 ℃. The lithium iron phosphate, the superfine conductive carbon black and the polyvinylidene fluoride are specifically prepared. The anode slurry comprises lithium iron phosphate, superfine conductive carbon black and polyvinylidene fluoride. The negative electrode slurry comprises graphite, superfine conductive carbon black and sodium carboxymethyl cellulose.
Step 22, positive electrode coating
The coating speed is selected to be 5-20m/min, the oven temperature is 90-110 ℃, and the wind frequency is 15-50m/min.
Step 23, cold pressing of the positive electrode
The single-sided positive pole piece is processed according to the proportion of 1.0-2.0g/cm 3 The compacted density of (a) is rolled to a certain thickness.
Step 24, negative electrode coating
The coating speed is selected to be 5-20m/min, the temperature of the oven is 60-90 ℃, and the air frequency is 15-20m/min.
Comparative example
The third coating method can be carried out in the following manner.
Step 31, preparing electrode material
The viscosity of the first active material (positive electrode) is 3000 to 8000 mPa.S -1 The drying temperature is 90 to 110 ℃; the viscosity of the second active material (negative electrode) is 4000 to 8000 mPa.S -1 The drying temperature is 60-90 DEG C. The anode slurry comprises lithium iron phosphate, superfine conductive carbon black and polyvinylidene fluoride. The negative electrode slurry comprises graphite, superfine conductive carbon black and sodium carboxymethyl cellulose.
Step 32, negative electrode coating
The coating speed is selected to be 5-20m/min, the temperature of the oven is 60-90 ℃, and the air frequency is 15-20m/min.
Step 33, coating of positive electrode
The coating speed is selected to be 5-20m/min, the oven temperature is 90-110 ℃, and the wind frequency is 15-50m/min.
The coating method can cause the anode material layer coated firstly to crack and fall off.
The fourth coating method can also be carried out in the following manner.
Step 21, preparing electrode material
The viscosity of the first active material (positive electrode) is 3000 to 8000 mPa.S -1 The drying temperature is 90 to 110 ℃; the viscosity of the second active material (negative electrode) is 4000 to 8000 mPa.S -1 The drying temperature is 60 to 90 ℃. The positive electrode slurry specifically comprises lithium iron phosphate, superfine conductive carbon black and polyvinylidene fluoride. The negative electrode slurry comprises graphite, superfine conductive carbon black and sodium carboxymethyl cellulose.
Step 22, coating of positive electrode
The coating speed is selected to be 5-20m/min, the oven temperature is 90-110 ℃, and the wind frequency is 15-50m/min.
Step 23, cold anode pressing
Making the single-sided positive pole piece into a size of 2.2g/cm 3 After rolling to a certain thickness.
Step 24, negative electrode coating
The coating speed is selected to be 5-20m/min, the temperature of the oven is 60-90 ℃, and the air frequency is 15-20m/min.
The above coating method may cause the previously coated positive electrode material layer to curl, and the current collector to curl.
In summary, for the composite current collector, the electrode material with high drying temperature is selected to be coated and dried first, and then the electrode material with low drying temperature is coated and dried. Or after the electrode material with high drying temperature is coated and dried, the electrode material is cold-pressed, and then the electrode material with low drying temperature is coated and dried.
The coating mode can ensure higher coating quality, and can avoid the problems caused by the scheme of firstly coating and drying the electrode material with low drying temperature, namely the electrode material with high drying temperature is coated and dried later, so that the electrode material layer with low drying temperature coated firstly has appearance problems of cracking, delamination and the like.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. A pole piece coating method is characterized in that the pole piece comprises a current collector, the current collector is provided with an insulating support body and a first conducting layer and a second conducting layer which are respectively formed on the two side surfaces of the support body and have opposite polarities, and the coating method comprises the following steps:
providing a first active material and a second active material with opposite polarities, wherein the drying temperature of the first active material is greater than or equal to the drying temperature of the second active material;
and coating the first active material on the surface of a first conductive layer with the same polarity as the first active material and drying, and then coating the second active material on the surface of a second conductive layer with the same polarity as the second active material and drying.
2. The pole piece coating method of claim 1, wherein the coating method comprises: a tabletting step performed after coating and drying the first active material and before coating the second active material;
optionally, the sheeting step is achieved by cold pressing using rollers;
optionally, during the performing step, suppressing curling of the current collector by adjusting a compacted density of the first active material;
optionally, the compacted density is determined by the areal density of the first active material;
optionally, the coating operation and the drying operation are performed simultaneously;
optionally, the drying operation is performed by introducing hot air into an oven.
3. The pole piece coating method according to claim 2, wherein the speed of coating the first active material and the speed of coating the second active material are independently controlled in a first range, and the frequency of the hot air for drying the first active material and the frequency of the hot air for drying the second active material are independently controlled in a second range.
4. The pole piece coating method according to any one of claims 1 to 3, wherein the viscosity of the first active material is 3000 to 8000 mPa.S -1 The viscosity of the second active material is 4000 to 8000mPa & S -1 The speed of coating the first active material and the speed of coating the second active material are respectively independent and controlled between 5 and 20m/min, the air frequency of hot air for drying the first active material and the air frequency of hot air for drying the second active material are respectively independent and controlled between 15 and 50m/min, the drying temperature of the first active material is 90 to 110 ℃, and the drying temperature of the second active material is 60 to 90 ℃.
5. A pole piece coating structure, comprising:
the composite current collector is provided with an insulating film layer, and a first conducting layer and a second conducting layer which are respectively formed on the surfaces of two sides of the insulating film layer and have opposite polarities;
a dried first active material layer attached to a surface of the first conductive layer;
and the dried second active material layer is attached to the surface of the second conductive layer, and the polarity of the second active material layer is opposite to that of the first active material layer.
6. The pole piece coating structure of claim 5, wherein the thickness of the insulating film layer is greater than the thickness of the first conductive layer and the thickness of the second conductive layer, respectively;
alternatively, the dried second active material layer has a compacted density of 1.0 to 2.2g/cm 3 ；
Alternatively, the surface of the second active material layer is flat.
7. The pole piece coating structure according to claim 5 or 6, wherein the first conductive layer is an aluminum layer.
8. The pole piece coating structure of claim 5 or 6, wherein the second conductive layer is a copper layer.
9. The pole piece coating structure of claim 5 or 6, wherein the insulating film layer is a polyethylene film layer, a polypropylene film layer or a polyimide film layer.
CN202110208089.0A 2021-02-24 2021-02-24 Pole piece coating structure and method Pending CN115632102A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110208089.0A CN115632102A (en) 2021-02-24 2021-02-24 Pole piece coating structure and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110208089.0A CN115632102A (en) 2021-02-24 2021-02-24 Pole piece coating structure and method

Publications (1)

Publication Number Publication Date
CN115632102A true CN115632102A (en) 2023-01-20

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Country Link
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