CN117832509A - Current collector, pole piece and preparation method of current collector - Google Patents
Current collector, pole piece and preparation method of current collector Download PDFInfo
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- CN117832509A CN117832509A CN202311831696.8A CN202311831696A CN117832509A CN 117832509 A CN117832509 A CN 117832509A CN 202311831696 A CN202311831696 A CN 202311831696A CN 117832509 A CN117832509 A CN 117832509A
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 89
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
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- WRDNCFQZLUCIRH-UHFFFAOYSA-N 4-(7-azabicyclo[2.2.1]hepta-1,3,5-triene-7-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1C2=CC=C1C=C2 WRDNCFQZLUCIRH-UHFFFAOYSA-N 0.000 claims description 4
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- GRQJZSJOACLQOV-UHFFFAOYSA-N [Li].[N] Chemical compound [Li].[N] GRQJZSJOACLQOV-UHFFFAOYSA-N 0.000 claims description 4
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- YZSKZXUDGLALTQ-UHFFFAOYSA-N [Li][C] Chemical compound [Li][C] YZSKZXUDGLALTQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000009713 electroplating Methods 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
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- 239000011572 manganese Substances 0.000 claims description 4
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 3
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
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Abstract
The invention discloses a current collector, a pole piece and a preparation method of the current collector. The current collector comprises a supporting layer, a conductive layer and a lithium supplementing layer. The support layer comprises a first surface and a second surface opposite to the first surface along the X direction; the conductive layers are respectively arranged on the first surface and the second surface; the lithium supplementing layer is arranged on the surface of the conducting layer, which is away from the supporting layer, and the electrode potential of the lithium supplementing layer is lower than that of the conducting layer. The method and the device can solve the problems that the conductive material on the composite current collector in the prior art is easy to corrode and the composite current collector cannot supplement lithium for the battery.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a current collector, a pole piece and a preparation method of the current collector.
Background
As an environmentally friendly lithium secondary battery, a lithium ion battery has been widely used in various electronic fields due to its characteristics of high specific energy, high specific power, long cycle life, good high and low temperature performance, and the like. The current collector is used as a component for collecting current in the battery, and can collect the current generated by the active substances of the battery and output the current with larger current, thereby playing a role in converting chemical energy into electric energy. Compared with the traditional current collector, the traditional current collector is a battery material with a sandwich structure, namely, a high polymer material is used as an intermediate layer, and metals such as copper and the like are plated on the upper surface and the lower surface of the intermediate layer by utilizing a vacuum coating process and the like, so that a composite material with double metal electric layers is formed.
The composite current collector may be used as a negative electrode or a positive electrode in a battery. When the metal coating is copper, the copper composite current collector is generally used as a negative electrode; when the metal coating is aluminum, the aluminum composite current collector generally serves as a positive electrode. However, during the charge and discharge cycle of the battery, the current composite current collector cannot prevent the conductive material on the current collector from being corroded, and cannot supplement lithium to the battery, which easily results in the degradation of the battery cycle performance.
Disclosure of Invention
The main purpose of the application is to provide a current collector, a pole piece and a preparation method of the current collector, so as to solve the problems that a conductive material on a composite current collector in the prior art is easy to corrode and the composite current collector cannot supplement lithium for a battery.
According to one aspect of the present application, there is provided a current collector comprising:
a support layer including a first surface and a second surface opposite to the first surface along an X direction;
the conductive layers are respectively arranged on the first surface and the second surface;
the lithium supplementing layer is arranged on the surface of the conducting layer, which is away from the supporting layer, and the electrode potential of the lithium supplementing layer is lower than that of the conducting layer.
Further, the lithium supplementing layer is prepared from at least one of lithium carbon alloy, lithium silicon alloy, lithium nitrogen alloy, lithium oxygen alloy and lithium sulfur alloy.
Further, the thickness of the lithium supplementing layer is 10nm to 1000nm along the X direction.
Further, the current collector further includes a corrosion resistant layer disposed between the conductive layer and the lithium supplementing layer.
Further, the corrosion-resistant layer is prepared from at least one of metal alloy and nonmetal.
Further, the current collector further comprises a plurality of through holes, and the plurality of through holes are arranged on the lithium supplementing layer at intervals and penetrate through the lithium supplementing layer and the conductive layer along the X direction.
Further, the conductive layer is prepared from at least one of copper, gold, lead, manganese and palladium; and/or the number of the groups of groups,
the supporting layer is prepared from at least one of polyethylene, polypropylene, ethylene propylene copolymer, polyethylene terephthalate, polyethylene naphthalate and poly-p-phenylene terephthalamide, acrylonitrile-butadiene-styrene copolymer, poly-p-phenylene terephthalamide, polypropylene, polyformaldehyde, epoxy resin, phenolic resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber and polycarbonate.
Further, the thickness of the support layer is 3 μm to 8 μm in the X direction; and/or the number of the groups of groups,
the thickness of the conductive layer is 10nm to 2000nm along the X direction.
On the other hand, the application also provides a preparation method of the current collector, wherein the preparation method of the current collector comprises the steps of:
step S1: obtaining the supporting layer, and preparing the conductive layer on the first surface and the second surface by adopting a magnetron sputtering method or a vacuum evaporation method in a vacuum environment;
step S2: preparing the lithium supplementing layer on the surface of the conducting layer, which is away from the supporting layer, by adopting a magnetron sputtering method or a vacuum evaporation method;
step S3: and preparing a through hole on the surface of the lithium supplementing layer by adopting one of a hole punching method, a hole pressing method, a corrosion method, an electrolytic method, an electroplating method and a laser etching method, wherein the through hole penetrates through the lithium supplementing layer and the conductive layer along the X direction.
On the other hand, the application also provides an electrode plate, which comprises the current collector.
In the application, the current collector can firstly adopt a magnetron sputtering or vacuum evaporation mode to sputter or plate the conductive layer on the surface of the supporting layer, and then utilize the magnetron sputtering or vacuum evaporation method to sputter or plate the lithium supplementing layer on the two surfaces of the conductive layer, which are away from the supporting layer. When the current collector is actually used, due to the potential difference between the conductive layer and the lithium supplementing layer, when the conductive layer and the lithium supplementing layer are in contact with each other, galvanic corrosion is formed between the conductive layer and the lithium supplementing layer, namely, the lithium supplementing layer with low electrode potential is taken as an anode to be dissolved, so that lithium ions are released, and the conductive layer with high electrode potential is taken as a cathode to be less dissolved or not dissolved at all, so that the conductive layer is prevented from being oxidized and corroded to a certain extent. Compared with the current collector in the prior art, when the current collector is used as a negative electrode in a battery, the added lithium supplementing layer in the application can not only avoid the oxidation corrosion of the conductive layer in the working process of the battery, but also can continuously supplement lithium ions for the battery.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a longitudinal cross-sectional view of a current collector as disclosed in an embodiment of the present application;
fig. 2 is a longitudinal cross-sectional view of another current collector disclosed in an embodiment of the present application;
FIG. 3 is a top view of a current collector disclosed in an embodiment of the present application;
fig. 4 is a flowchart of a method for preparing a current collector according to an embodiment of the present application.
Wherein the above figures include the following reference numerals:
10. a support layer; 101. a first surface; 102. a second surface; 20. a conductive layer; 30. a lithium supplementing layer; 40. a corrosion resistant layer; 50. and a through hole.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As mentioned in the background art, the existing copper composite current collector is generally used as a negative electrode in a battery, but during the charge-discharge cycle of the battery, the composite current collector cannot prevent the conductive material on the current collector from being corroded, and cannot supplement lithium to the battery, thereby resulting in the degradation of the cycle performance of the battery. Accordingly, the inventors of the present application devised a novel current collector, which will be described in detail below, in order that the conductive material on the composite current collector is not oxidized and corroded, and that the composite current collector can supplement lithium ions consumed in the battery.
Referring to fig. 1 to 4, the present application provides a current collector including a support layer 10, a conductive layer 20, and a lithium supplementing layer 30.
Wherein, in the X-direction (the direction indicated by the letter a in the drawing), the support layer 10 comprises a first surface 101 and a second surface 102 opposite to the first surface 101; the conductive layer 20 is disposed on the first surface 101 and the second surface 102, respectively; the lithium supplementing layer 30 is disposed on a surface of the conductive layer 20 facing away from the supporting layer 10, and an electrode potential of the lithium supplementing layer 30 is lower than an electrode potential of the conductive layer 20.
In this embodiment, the support layer 10 includes a first surface 101 and a second surface 102. In actual processing, the conductive layer 20 may be sputtered or plated on the first surface 101 and the second surface 102 of the support layer 10 by using a magnetron sputtering or vacuum evaporation method, and then the lithium supplementing layer 30 may be sputtered or plated on the surface of the conductive layer 20 by using a magnetron sputtering or vacuum evaporation method. Compared with the prior art, the embodiment adds the lithium supplementing layer 30, because the electrode potential of the lithium supplementing layer 30 is lower than that of the conductive layer 20, when the current collector of the embodiment is used in a battery, the lithium supplementing layer 30 is an anode, the conductive layer 20 is a cathode, and in the process, the lithium supplementing layer 30 is dissolved, so that lithium ions are released. In this way, the conductive layer 20 as the cathode is not dissolved, so that oxidation corrosion of the conductive layer 20 can be avoided, and meanwhile, lithium ions consumed during battery operation can be supplemented by the release of lithium ions in the lithium supplementing layer 30.
That is, the current collector of the present embodiment may first adopt a magnetron sputtering or vacuum evaporation method to sputter or plate the conductive layer 20 on the surface of the supporting layer 10, and then use the magnetron sputtering or vacuum evaporation method to sputter or plate the lithium supplementing layer 30 on the two surfaces of the conductive layer 20 facing away from the supporting layer 10. When the current collector is actually used, due to the potential difference between the conductive layer 20 and the lithium supplementing layer 30, when the conductive layer 20 and the lithium supplementing layer 30 are in contact with each other, galvanic corrosion is formed between the conductive layer 20 and the lithium supplementing layer 30, namely, the lithium supplementing layer 30 with low electrode potential is dissolved as an anode so as to release lithium ions, and the conductive layer 20 with high electrode potential is less dissolved or completely insoluble as a cathode so as to prevent the conductive layer 20 from being corroded by oxidation to a certain extent. Compared with the current collector used as the negative electrode in the battery in the prior art, the added lithium supplementing layer 30 in this embodiment can not only avoid the oxidation corrosion of the conductive layer 20 during the operation of the battery, but also continuously supplement lithium ions for the battery.
Further, in order to continuously supplement lithium to the battery, the lithium supplementing layer 30 in this embodiment is prepared by using at least one of a lithium carbon alloy, a lithium silicon alloy, a lithium nitrogen alloy, a lithium oxygen alloy and a lithium sulfur alloy. Referring to fig. 1, in this embodiment, the lithium-compensating layer 30 is sputtered or plated on the conductive layer 20 by magnetron sputtering or vacuum evaporation, and galvanic corrosion is formed between the electrode potential of the lithium-compensating layer 30 and the electrode potential of the conductive layer 20 when the electrode potential is lower than the electrode potential. Thus, the present embodiment employs at least one of a lithium carbon alloy, a lithium silicon alloy, a lithium nitrogen alloy, a lithium oxygen alloy, and a lithium sulfur alloy to prepare the lithium supplementing layer 30. When the battery starts to work, the lithium supplementing layer 30 with low electrode potential is taken as an anode to be dissolved, and the conductive layer 20 with high electrode potential is taken as a cathode to be less dissolved or not dissolved at all, so that the conductive layer 20 can be prevented from being corroded by oxidation, and lithium supplementing of the battery can be continuously performed.
Alternatively, the thickness of the lithium supplementing layer 30 in the present embodiment is 10nm to 1000nm in the X direction, for example: 10nm, 100nm, 200nm, 400nm, 600nm, 800nm, 1000nm. Wherein the X direction is the direction indicated by the letter a in the drawing. The thickness of the lithium-compensating layer 30 is one of the important factors affecting the performance of the current collector, and in this embodiment, the change in the thickness of the lithium-compensating layer 30 affects the amount of released lithium ions and the conductivity of the current collector. When the thickness of the lithium supplementing layer 30 is smaller than 10nm, too thin lithium supplementing layer 30 cannot bear more lithium ions, and the lithium ions released after the lithium supplementing layer 30 is dissolved are insufficient to continuously supplement lithium for the battery, so that the service life of the battery is reduced; when the thickness of the lithium supplementing layer 30 is 10nm to 1000nm, the increase of the thickness of the lithium supplementing layer 30 can effectively compensate the loss of irreversible capacity in the battery and improve the cycle performance of the electrode, and meanwhile, the lithium supplementing layer 30 within the thickness range can be fully dissolved when galvanic corrosion occurs, so that the conductive layer 20 can not be oxidized and corroded; however, the thickness of the lithium-compensating layer 30 is not easily too large, and when the thickness of the lithium-compensating layer 30 is greater than 1000nm, the too thick lithium-compensating layer 30 hinders the transmission of lithium ions, resulting in an increase in the internal resistance of the battery, and further, the cycle performance of the battery is reduced to some extent.
Further, referring to fig. 2, the current collector in the present embodiment further includes a corrosion-resistant layer 40, and the corrosion-resistant layer 40 is disposed between the conductive layer 20 and the lithium supplementing layer 30. Since the contact between the conductive layer 20 and the lithium-compensating layer 30 will form galvanic corrosion, in theory, the galvanic corrosion phenomenon will not damage the conductive layer 20, but in order to further avoid the influence of galvanic corrosion on the conductive layer 20, the embodiment sets the corrosion-resistant layer 40 between the conductive layer 20 and the lithium-compensating layer 30, and the existence of the corrosion-resistant layer 40 can avoid the conductive layer 20 from being oxidized and corroded, thereby improving the service life of the battery. In addition, the corrosion-resistant layer 40 can also increase the binding force between the conductive layer 20 and the lithium supplementing layer 30, and effectively prevent the lithium supplementing layer 30 from falling off when the battery does not work.
Further, in order to prevent the conductive layer 20 from being oxidized and corroded and to improve the adhesion between the conductive layer 20 and the lithium supplementing layer 30, the corrosion-resistant layer 40 in the present embodiment is made of at least one of a metal alloy and a nonmetal, such as aluminum oxide, a copper alloy, an aluminum alloy, silicon nitride, silicon carbide, and the like. The aluminum oxide has wear resistance, corrosion resistance, high temperature resistance and good adhesive force, and is easy to combine with other functional layers; the copper alloy has good electrical conductivity, thermal conductivity, plasticity and corrosion resistance; the aluminum alloy has higher electrical conductivity, thermal conductivity, workability and corrosion resistance; the silicon nitride has extremely high thermal stability and can stably operate in a high-temperature and high-pressure environment; the silicon carbide has better heat radiation performance, heat conductivity exceeding that of metallic copper and stronger corrosion resistance. Therefore, in this embodiment, the corrosion-resistant layer 40 is disposed between the conductive layer 20 and the lithium-compensating layer 30, so as to prevent the conductive layer 20 from being damaged by galvanic corrosion, and meanwhile, improve the bonding force between the conductive layer 20 and the lithium-compensating layer 30, so as to prevent the lithium-compensating layer 30 from falling off before the battery begins to operate.
Further, since the lithium-compensating layer 30 releases lithium ions by dissolution, in order to avoid the release of the active material coated on the surface of the current collector and lithium ions, the current collector in this embodiment further includes a plurality of through holes 50, and the plurality of through holes 50 are disposed on the lithium-compensating layer 30 at intervals and penetrate through the lithium-compensating layer 30 and the conductive layer 20 along the X direction. The X direction is the direction indicated by the letter A in the figure. Referring to fig. 1 and 3, in one embodiment of the present application, a plurality of through holes 50 penetrate through the lithium supplementing layer 30 and the conductive layer 20 and are in direct contact with the supporting layer 10; referring to fig. 2 to 3, in another embodiment of the present application, a plurality of through holes 50 penetrate through the lithium supplementing layer 30, the corrosion resistant layer and the conductive layer 20 and are in direct contact with the support layer 10. So set up, when the active material is applied to the current collector surface, the active material enters into the current collector through the through hole 50 and contacts with the support layer 10, effectively enhancing the adhesion between the active material and the current collector, and further avoiding the active material falling off from the current collector due to the dissolution of the lithium supplementing layer 30.
Further, in order to ensure that the lithium supplementing layer 30 dissolves and releases lithium ions in the battery, the conductive layer 20 in this embodiment is made of at least one of copper, gold, lead, manganese and palladium. That is, among the above materials, different combinations of materials may be selected as the conductive layer 20. Since the lithium supplementing layer 30 is made of lithium alloy material, the electrode potential of copper, gold, lead, manganese and palladium elements adopted by the conductive layer 20 in this embodiment is higher than that of lithium elements, so that galvanic corrosion occurs between the conductive layer 20 and the lithium supplementing layer 30 when the conductive layer 20 contacts with the lithium supplementing layer 30, so that the lithium supplementing layer 30 is dissolved as an anode and releases lithium ions, and the conductive layer 20 is protected as a cathode, thereby avoiding the oxidation corrosion of the conductive layer 20. It can be seen that the electrode potential of the conductive layer 20 in this embodiment is higher than that of the lithium-ion-supplementing layer 30, so that not only can the conductive layer 20 be prevented from being corroded, but also lithium ions can be continuously supplemented to the operating battery. In addition, referring to fig. 2, in this embodiment, the corrosion-resistant layer 40 is sputtered or plated on the surface of the conductive layer 20 by magnetron sputtering or vacuum evaporation, and since the corrosion-resistant layer 40 is made of at least one of a metal alloy and a nonmetal, when the conductive layer 20 is made of copper metal, the corrosion-resistant layer 40 may be an alloy of copper and other nonmetal elements, so that fusion connection between the corrosion-resistant layer 40 and the conductive layer 20 can be more easily achieved.
Further, the support layer 10 in this embodiment is made of at least one of polyethylene, polypropylene, ethylene propylene copolymer, polyethylene terephthalate, polyethylene naphthalate, poly-paraphenylene terephthalamide, acrylonitrile-butadiene-styrene copolymer, poly-paraphenylene terephthalamide, polypropylene, polyoxymethylene, epoxy resin, phenolic resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, and polycarbonate. Among the above materials, the base material of the support layer 10 may be variously combined. Referring to fig. 1, the supporting layer 10 of the present embodiment is disposed between two conductive layers 20, so that the two conductive layers 20 can be isolated, and current transmission between the two conductive layers 20 can be effectively avoided. Meanwhile, the supporting layer 10 of the embodiment is prepared from the above materials, which is beneficial to the subsequent coating process.
Specifically, the support layer 10 in this embodiment is made of polypropylene. Because polypropylene has strong corrosion resistance, only carbon-carbon bonds exist in the molecular chain. The polypropylene can be corroded by concentrated sulfuric acid and concentrated nitric acid, and can be suitable for other various chemical reagents, and the chemical properties are stable, and particularly when the current collector is applied to a battery, the supporting layer 10 taking the polypropylene as the current collector is not easy to corrode by electrolyte, so that the service life of the battery can be prolonged.
Alternatively, the thickness of the support layer 10 in the present embodiment is 3 μm to 8 μm, for example, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, in the X direction. Wherein the X direction is the direction indicated by the letter A in the figure. Since the conductive layer 20 in this embodiment is sputtered or plated on the surface of the supporting layer 10 by magnetron sputtering or vacuum evaporation, the supporting layer 10 needs to be stretched completely on the rotatable roller in the process, so that the conductive layer 20 can be sputtered or plated on the first surface 101 and the second surface 102 of the supporting layer 10. When the thickness of the supporting layer 10 is less than 3 μm, the supporting layer 10 is damaged during the stretching process, which is not beneficial to the coating of the subsequent conductive layer 20; when the thickness of the support layer 10 is greater than 8 μm, an excessively thick thickness may increase the cost of the current collector as a whole. Therefore, the thickness of the supporting layer 10 in this embodiment is set to 3 μm to 8 μm, which not only can satisfy the requirements of the production process, but also can reduce the weight of the current collector, thereby reducing the manufacturing cost of the current collector.
Alternatively, the thickness of the conductive layer 20 in this embodiment is 10nm to 2000nm, for example, 10nm, 100nm, 200nm, 400nm, 600nm, 800nm, 1000nm, 1200nm, 1400nm, 1600nm, 1800nm, 2000nm, in the X direction. Wherein the X direction is the direction indicated by the letter A in the figure. Referring to fig. 1, the current collector is made conductive by disposing the conductive layer 20 between the support layer 10 and the lithium supplementing layer 30. When the thickness of the conductive layer 20 is less than 10nm, the conductive performance of the current collector is reduced; when the thickness of the conductive layer 20 is greater than 2000nm, the weight of the current collector is increased to some extent, thereby increasing the manufacturing cost of the current collector. Therefore, the thickness of the conductive layer in the X direction in this embodiment is 10nm to 2000nm.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: compared with the current collector in the prior art, when the current collector is used as a negative electrode to be applied to a battery, the newly added lithium supplementing layer makes up the defect that the conductive material on the current collector is corroded and can not supplement lithium for the battery when the current collector is charged and discharged. The existence of the lithium supplementing layer can not only prevent the conductive layer from being corroded by oxidation, but also continuously supplement lithium ions consumed in the battery, so that the service life of the battery is prolonged.
On the other hand, the embodiment of the application also provides a preparation method of the current collector, and referring to fig. 4, the preparation method of the current collector comprises the following steps:
step S1: obtaining a supporting layer 10, and preparing a conductive layer 20 on a first surface 101 and a second surface 102 by adopting a magnetron sputtering method or a vacuum evaporation method in a vacuum environment;
step S2: a lithium supplementing layer 30 is prepared on the surface of the conductive layer 20, which is away from the supporting layer 10, by adopting a magnetron sputtering method or a vacuum evaporation method;
step S3: the through holes 50 are prepared on the surface of the lithium supplementing layer 30 by one of a hole punching method, a hole pressing method, an etching method, an electrolytic method, an electroplating method and a laser etching method, and the through holes 50 penetrate through the lithium supplementing layer 30 and the conductive layer 20 along the X direction.
From the above description, it can be seen that, in the present application, a magnetron sputtering or vacuum evaporation method is adopted to sputter or plate the conductive layer on the surface of the supporting layer, and then a magnetron sputtering or vacuum evaporation method is utilized to sputter or plate the lithium supplementing layer on two surfaces of the conductive layer, which are away from the supporting layer. Because potential difference exists between the conductive layer and the lithium supplementing layer, when the conductive layer and the lithium supplementing layer are in contact with each other, galvanic corrosion is formed between the conductive layer and the lithium supplementing layer, so that the lithium supplementing layer is dissolved and releases lithium ions, the conductive layer can be prevented from being oxidized and corroded in the working process of the battery, and lithium ions can be continuously supplemented for the battery in the working process. Meanwhile, the through holes are prepared on the surface of the lithium supplementing layer by one of a hole punching method, a hole pressing method, an etching method, an electrolytic method, an electroplating method and a laser etching method, and penetrate through the lithium supplementing layer and the conductive layer along the X direction, so that the active materials coated on the surface of the current collector are facilitated to enter the current collector, and further falling of the active materials along with dissolution of the lithium supplementing layer is avoided.
On the other hand, the embodiment of the application also provides an electrode plate, which comprises the current collector, so that the electrode plate comprises all the technical effects of the current collector. Since the technical effects of the current collector have been described in detail in the foregoing, a detailed description thereof will be omitted.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A current collector, comprising:
-a support layer (10), in X-direction, the support layer (10) comprising a first surface (101) and a second surface (102) opposite to the first surface (101);
a conductive layer (20), the conductive layer (20) being disposed on the first surface (101) and the second surface (102), respectively;
the lithium supplementing layer (30), the lithium supplementing layer (30) is arranged on the surface of the conducting layer (20) deviating from the supporting layer (10), and the electrode potential of the lithium supplementing layer (30) is lower than that of the conducting layer (20).
2. The current collector of claim 1, wherein the lithium-compensating layer (30) is made of at least one of a lithium-carbon alloy, a lithium-silicon alloy, a lithium-nitrogen alloy, a lithium-oxygen alloy, and a lithium-sulfur alloy.
3. Current collector according to claim 2, characterized in that the thickness of the lithium-compensating layer (30) is 10nm to 1000nm in the X-direction.
4. The current collector of claim 1, further comprising a corrosion resistant layer (40), the corrosion resistant layer (40) being disposed between the conductive layer (20) and the lithium-compensating layer (30).
5. The current collector of claim 4, wherein said corrosion resistant layer (40) is made of at least one of a metal alloy and a non-metal.
6. The current collector of claim 4, further comprising a plurality of through holes (50), wherein the plurality of through holes (50) are disposed on the lithium supplementing layer (30) at intervals, and penetrate through the lithium supplementing layer (30) and the conductive layer (20) along the X direction.
7. The current collector of claim 1, wherein the conductive layer (20) is made of at least one of copper, gold, lead, manganese and palladium; and/or the number of the groups of groups,
the supporting layer (10) is prepared from at least one of polyethylene, polypropylene, ethylene propylene copolymer, polyethylene terephthalate, polyethylene naphthalate and poly-p-phenylene terephthalamide, acrylonitrile-butadiene-styrene copolymer, poly-p-phenylene terephthalamide, polypropylene, polyformaldehyde, epoxy resin, phenolic resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber and polycarbonate.
8. Current collector according to claim 6, characterized in that the thickness of the support layer (10) in the X-direction is 3 μm to 8 μm; and/or the number of the groups of groups,
the thickness of the conductive layer (20) is 10nm to 2000nm in the X direction.
9. A method for producing a current collector, characterized in that the method for producing a current collector comprises the current collector according to any one of claims 1 to 8, the method for producing a current collector comprising:
step S1: obtaining the supporting layer (10), and preparing the conductive layer (20) on the first surface (101) and the second surface (102) by adopting a magnetron sputtering method or a vacuum evaporation method in a vacuum environment;
step S2: preparing the lithium supplementing layer (30) on the surface of the conducting layer (20) deviating from the supporting layer (10) by adopting a magnetron sputtering method or a vacuum evaporation method;
step S3: and preparing a through hole (50) on the surface of the lithium supplementing layer (30) by adopting one of a hole punching method, a hole pressing method, a corrosion method, an electrolytic method, an electroplating method and a laser etching method, wherein the through hole (50) penetrates through the lithium supplementing layer (30) and the conductive layer (20) along the X direction.
10. An electrode sheet, characterized in that the electrode sheet comprises the current collector according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311831696.8A CN117832509A (en) | 2023-12-27 | 2023-12-27 | Current collector, pole piece and preparation method of current collector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311831696.8A CN117832509A (en) | 2023-12-27 | 2023-12-27 | Current collector, pole piece and preparation method of current collector |
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| CN117832509A true CN117832509A (en) | 2024-04-05 |
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| CN202311831696.8A Pending CN117832509A (en) | 2023-12-27 | 2023-12-27 | Current collector, pole piece and preparation method of current collector |
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| CN (1) | CN117832509A (en) |
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