CN218471984U - Lithium battery negative electrode pre-lithium release film - Google Patents
Lithium battery negative electrode pre-lithium release film Download PDFInfo
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- CN218471984U CN218471984U CN202221683262.9U CN202221683262U CN218471984U CN 218471984 U CN218471984 U CN 218471984U CN 202221683262 U CN202221683262 U CN 202221683262U CN 218471984 U CN218471984 U CN 218471984U
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 274
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 224
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 39
- 239000012528 membrane Substances 0.000 claims abstract description 25
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 14
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 14
- 238000000576 coating method Methods 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 10
- 239000006185 dispersion Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 132
- 210000004379 membrane Anatomy 0.000 description 21
- 238000000034 method Methods 0.000 description 17
- 229910001297 Zn alloy Inorganic materials 0.000 description 12
- KUJOABUXCGVGIY-UHFFFAOYSA-N lithium zinc Chemical compound [Li].[Zn] KUJOABUXCGVGIY-UHFFFAOYSA-N 0.000 description 12
- 229910000838 Al alloy Inorganic materials 0.000 description 11
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 11
- 229910000640 Fe alloy Inorganic materials 0.000 description 10
- 229910000861 Mg alloy Inorganic materials 0.000 description 10
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 10
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 description 10
- 238000003490 calendering Methods 0.000 description 9
- 230000002349 favourable effect Effects 0.000 description 9
- 229910002804 graphite Inorganic materials 0.000 description 9
- 239000010439 graphite Substances 0.000 description 9
- 238000010030 laminating Methods 0.000 description 8
- 238000006138 lithiation reaction Methods 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000006230 acetylene black Substances 0.000 description 5
- 229910021383 artificial graphite Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007773 negative electrode material Substances 0.000 description 5
- 229920002545 silicone oil Polymers 0.000 description 5
- 239000006245 Carbon black Super-P Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 229910021382 natural graphite Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- AUEPDNOBDJYBBK-UHFFFAOYSA-N [Si].[C-]#[O+] Chemical compound [Si].[C-]#[O+] AUEPDNOBDJYBBK-UHFFFAOYSA-N 0.000 description 2
- 238000007754 air knife coating Methods 0.000 description 2
- 210000002469 basement membrane Anatomy 0.000 description 2
- 238000012769 bulk production Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- -1 graphite alkene Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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Abstract
The utility model provides a lithium battery negative pole is lithium in advance from type membrane, lithium battery negative pole is lithium in advance from type membrane and is included the base film and set up the carbon-bed on the at least side surface of base film, a side surface that the base film was kept away from to the carbon-bed is provided with the lithium layer. The carbon layer is arranged on the surface of the base film, so that the adhesion performance and the dispersion performance of lithium metal in the lithium layer are improved, and the cost is reduced; the lithium battery negative electrode pre-lithium release film is adopted for negative electrode pre-lithium, so that the contact area between lithium metal and the surface of a negative electrode can be increased, the conversion efficiency of the lithium metal converted into active lithium ions is improved, and the uniform coating of the lithium metal on the surface of the negative electrode is facilitated.
Description
Technical Field
The utility model belongs to the technical field of the battery, a lithium is from type membrane in advance to lithium cell negative pole is related to.
Background
The lithium ion battery cathode pre-lithium technology can improve the cycle life of the lithium ion battery, and therefore, the lithium ion battery cathode pre-lithium technology is receiving more and more attention from researchers. At present, the most promising method for realizing lithium ion battery prelithiation commercialization is to attach lithium metal to a graphite cathode, a silicon-based cathode, and a graphite-silicon-based cathode, so that the lithium metal is directly contacted with the cathode, and then the electrolyte is infiltrated into a cathode sheet through one-time liquid injection.
CN111952545B provides a pre-lithiated lithium ion secondary battery negative electrode material and a mechanical pre-lithiation method, placing a lithium ribbon with a predetermined thickness and a sheet-shaped battery negative electrode material in a dry environment, flatly attaching the lithium ribbon and the sheet-shaped battery negative electrode material together to obtain an attachment material, pressing the attachment material by a pressure device to obtain a pre-lithiated secondary battery negative electrode material, and filling the pre-lithiated negative electrode material. CN110010844B provides a graded calendering molding method of a pre-lithium negative electrode, which is characterized in that preliminary calendering of a lithium belt is completed on a pre-pressing roller through a graded calendering lithium foil method, then a release film is introduced between main pressing rollers to assist secondary calendering of the lithium belt to form the lithium foil, the lithium foil is finally attached to the release film on the fast roller side of the main pressing rollers, and the pre-lithium negative electrode is prepared through rolling of a composite roller and compounding of a negative electrode piece through transfer printing of the release film. CN210576212U provides a lithium ion battery silicon-based negative pole piece is with lithiation device in advance, and the device carries out direct prelithiation process with electrode slice and metal lithium stick direct contact, and accessible changes contact pressure, contact time isoparametric change lithiation degree in advance, realizes continuous production, and does not relate to metal lithium powder, and the security is high, can effectively lithium in advance.
At present, a method for mechanically supplementing lithium to a graphite negative electrode by a calendaring lamination technology is well known, namely, lithium metal is transferred on a PET release film, and then the lithium metal is laminated on the surface of a negative electrode sheet from the PET film, so that the PET release film is very important for pre-lithium of the negative electrode; in the prior art, most of release films used for producing batteries by the process are PET base films coated with a layer of silicone oil on the surfaces so as to meet the process requirements. However, the cost of the silicone oil is too high, and in addition, the uniformity of the silicone oil and the silicone oil have a great influence on the production of the negative pre-lithium electrode plate in the coating process, so that a release film with low cost and good coating performance needs to be provided to optimize the output of the pre-lithium electrode plate.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a lithium cell negative pole is lithium in advance from type membrane. The carbon layer is arranged on the surface of the base film, so that the adhesion performance and the dispersion performance of lithium metal in the lithium layer are improved, and the cost is reduced; the negative electrode pre-lithium release film for the lithium battery is adopted for negative electrode pre-lithium, so that the contact area between lithium metal and the surface of the negative electrode can be increased, the conversion efficiency of the lithium metal into active lithium ions is improved, and the uniform coating of the lithium metal on the surface of the negative electrode is facilitated.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a lithium battery negative pole is lithium in advance from type membrane, especially a lithium battery negative pole that is used for calendering to cover to close in advance lithium is lithium in advance from type membrane, lithium battery negative pole is lithium in advance from type membrane and is included the base film and set up the carbon-layer on the at least side surface of base film, the carbon-layer is provided with the lithium layer on a side surface of keeping away from the base film.
The utility model discloses a lithium battery negative pole is lithium from type membrane in advance includes carbon-bed and lithium layer that at least one side surface of base film set up, and on the one hand, the setting of carbon-bed can make the base film surface rougher, is favorable to ultra-thin lithium metal to adhere on its surface, has effectively improved adhesion performance and dispersion ability of lithium metal in the lithium layer, has reduced lithium battery negative pole lithium from type membrane cost in advance, is favorable to the negative pole lithium from type membrane's bulk production in advance; on the other hand, the utility model discloses a lithium battery negative pole is in advance from type membrane when carrying out the negative pole lithium in advance, can improve the area of contact of lithium metal and negative pole surface, is favorable to improving the conversion efficiency that the lithium metal turned into active lithium ion, and simultaneously, the lithium battery negative pole is in advance from type membrane homogeneity good, is favorable to the even combination of lithium metal on the negative pole surface.
As a preferred technical solution of the present invention, the carbon layer includes one or a combination of at least two of an artificial graphite layer, a natural graphite layer, an acetylene black layer, a graphitized mesophase carbon microsphere layer, a Super-P layer, a conductive graphite layer and a graphene layer, for example, the carbon layer may be a combination of an artificial graphite layer and a natural graphite layer, a combination of an acetylene black layer and a graphitized mesophase carbon microsphere layer, a combination of a Super-P layer, a conductive graphite layer and a graphene layer, or a combination of an artificial graphite layer, an acetylene black layer, a Super-P layer, a conductive graphite layer and a graphene layer.
In a preferred embodiment of the present invention, the carbon layer has a thickness of 0.1 to 10 μm, for example, 0.1 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm. When the carbon layer is too thin, lithium in the lithium layer is easily dispersed unevenly, and the lithium is easily adhered to the surface of the base film and is not easily separated; when the carbon layer is thicker, phenomena such as powder falling and the like are easily generated, and the distribution of the lithium layer and the pre-lithium effect of the lithium battery negative electrode pre-lithium release film are influenced.
The number of carbon layers in the present invention is not particularly limited, and the carbon layers may have a single-layer structure or a multilayer structure within a thickness range of 0.1 to 10 μm.
As a preferred technical scheme of the utility model, the base film includes the PET base film.
In a preferred embodiment of the present invention, the thickness of the base film is 20 to 50 μm, and may be, for example, 20 μm, 25 μm, 30 μm, 35 μm, 36 μm, 37 μm, 40 μm, 45 μm, or 50 μm.
As a preferred technical scheme of the utility model, the thickness of the base film is 35-37 μm, and within the thickness range, the base film has stronger practicability and is more suitable for industrial production and application; in addition, the release film with too low thickness is easy to deform and break in the calendering process, so that the production of the pre-lithium pole piece is influenced, and the release film with too high thickness can increase the cost and cause resource waste.
As a preferred embodiment of the present invention, the lithium layer includes any one or a combination of at least two of a lithium metal layer, a lithium aluminum alloy layer, a lithium magnesium alloy layer, a lithium zinc alloy layer, and a lithium iron alloy layer, and for example, the lithium layer may be a combination of a lithium metal layer and a lithium aluminum alloy layer, a combination of a lithium magnesium alloy layer and a lithium zinc alloy layer, a combination of a lithium zinc alloy layer and a lithium iron alloy layer, or a combination of a lithium metal layer, a lithium aluminum alloy layer, a lithium magnesium alloy layer, a lithium zinc alloy layer, and a lithium iron alloy layer.
In a preferred embodiment of the present invention, the thickness of the lithium layer is 1 to 20 μm, and may be, for example, 1 μm, 2 μm, 4 μm, 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, or 20 μm. The utility model discloses the thickness on lithium layer is confirmed to the lithium metal that needs according to lithium ion battery's actual design volume that covers, when lithium layer design thickness is too thin, can surpass the equipment operation limit, and the calendering does not go out corresponding lithium metal thickness. When the lithium layer is too thick, the pre-lithium pole piece is easily damaged in the lamination process, and the pre-lithium pole piece can be broken in serious cases.
The utility model discloses a cooperation of thickness and material between base film, carbon-bed and the lithium layer, synergy can further promote lithium metal's adhesion performance and dispersion can, lithium metal turns into active lithium ion's conversion efficiency with area of contact, the lithium metal on negative pole surface in the lithium layer, is favorable to the even combination of lithium metal on the negative pole surface.
As a preferred technical scheme of the utility model, the lithium layer includes at least one lithium area, the lithium area is followed lithium is in advance distributed from the length or the width direction of type membrane to the lithium cell negative pole, adjacent two misalignment between the lithium area, through the setting in lithium area, further improve the homogeneity of lithium in advance.
As a preferred embodiment of the present invention, the lithium strip includes any one or a combination of at least two of a lithium metal strip, a lithium aluminum alloy strip, a lithium magnesium alloy strip, a lithium zinc alloy strip, and a lithium iron alloy strip, and for example, the lithium metal strip and the lithium aluminum alloy strip may be combined, the lithium magnesium alloy strip and the lithium zinc alloy strip may be combined, the lithium zinc alloy strip and the lithium iron alloy strip may be combined, or the lithium metal strip, the lithium aluminum alloy strip, the lithium magnesium alloy strip, the lithium zinc alloy strip, and the lithium iron alloy strip may be combined.
Exemplarily, the utility model provides a preparation method of above-mentioned lithium battery negative pole prelithium release film, preparation method includes:
(1) Coating a carbon layer on the surface of the base film by one or more of slurry spraying, air knife coating and bar coating;
(2) And (3) any one or at least two of lithium metal, lithium aluminum alloy, lithium magnesium alloy, lithium zinc alloy and lithium iron alloy are rolled on the surface of the carbon layer to obtain the lithium battery negative electrode pre-lithium release film.
Illustratively, the utility model also provides a method for adopting above-mentioned lithium battery negative pole to carry out lithium battery negative pole lithium in advance from type membrane, the method includes:
(1) Transferring the lithium battery negative electrode pre-lithium release film to the surface of the lithium battery negative electrode by using a laminating roller under the laminating pressure of 0.1-2.5T, wherein the surface of one side of the lithium layer of the lithium battery negative electrode pre-lithium release film is opposite to the surface of the lithium battery negative electrode;
(2) And uncovering the base film of the lithium battery negative electrode pre-lithium release film to complete pre-lithium, and forming a lithium battery negative electrode, a lithium layer and a carbon layer which are sequentially laminated.
Optionally, the lithium battery negative electrode comprises any one of a graphite negative electrode, a silicon-carbon oxide negative electrode and a lithium titanate negative electrode or a combination of at least two of the two.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a lithium battery negative pole is lithium from type membrane in advance includes carbon-layer and lithium layer that at least one side surface of base film set up, on the one hand, the setting of carbon-layer can make the base film surface rougher, is favorable to ultra-thin lithium metal to adhere on its surface, has effectively improved the adhesion performance and the dispersion quality of lithium metal in the lithium layer, has reduced lithium battery negative pole and has been lithium from type membrane cost in advance, is favorable to the bulk production of negative pole lithium pole piece in advance; on the other hand, the utility model discloses a lithium battery negative pole is in advance from type membrane when carrying out the negative pole lithium in advance, can improve the area of contact of lithium metal and negative pole surface, is favorable to improving the conversion efficiency that the lithium metal turned into active lithium ion, and simultaneously, the lithium battery negative pole is in advance from type membrane homogeneity good, is favorable to the even combination of lithium metal on the negative pole surface.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery negative electrode pre-lithiation release film in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a lithium battery negative electrode pre-lithiation release film in an embodiment of the present invention.
Fig. 3 is a flow chart illustrating the preparation of the lithium battery negative electrode pre-lithium release film and the pre-lithium of the lithium battery negative electrode in one embodiment of the present invention.
Among them, 1-a base film; a 2-carbon layer; 3-a lithium layer; 4-lithium battery negative electrode.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments with reference to the drawings.
In a specific embodiment, as shown in fig. 1 and fig. 2, the utility model provides a lithium battery negative pole is lithium from type membrane in advance, its characterized in that, lithium battery negative pole is lithium from type membrane in advance includes base film 1 and sets up carbon layer 2 on at least one side surface of base film 1, carbon layer 2 is provided with lithium layer 3 in a side surface of keeping away from base film 1.
Further, the carbon layer 2 includes any one of an artificial graphite layer, a natural graphite layer, an acetylene black layer, a graphitized mesophase carbon microsphere layer, a Super-P layer, a conductive graphite layer and a graphene layer or a combination of at least two thereof.
Further, the carbon layer 2 has a thickness of 0.1 to 10 μm.
Further, the base film 1 includes a PET base film.
Further, the thickness of the base film 1 is 20 to 50 μm.
Further, the thickness of the base film 1 is 35 to 37 μm.
Further, the lithium layer 3 includes any one of a lithium metal layer, a lithium aluminum alloy layer, a lithium magnesium alloy layer, a lithium zinc alloy layer, and a lithium iron alloy layer, or a combination of at least two thereof, as shown in fig. 1.
Further, the thickness of the lithium layer 3 is 1 to 20 μm.
Further, the lithium layer 3 includes at least one lithium tape, the lithium tape is distributed along the length or width direction of the lithium battery negative electrode pre-lithium release film, and two adjacent lithium tapes are not overlapped with each other, as shown in fig. 2.
Further, the lithium strip includes any one of a lithium metal strip, a lithium aluminum alloy strip, a lithium magnesium alloy strip, a lithium zinc alloy strip, and a lithium iron alloy strip, or a combination of at least two thereof.
Exemplarily, there is provided a method for preparing the lithium battery negative electrode pre-lithium release film, a flowchart is shown in fig. 3, and the method comprises:
(1) Coating a carbon layer 2 on the surface of a base film 1 by one or more coating modes of slurry spraying, air knife coating and bar coating;
(2) Any one or at least two of lithium metal, lithium aluminum alloy, lithium magnesium alloy, lithium zinc alloy and lithium iron alloy are rolled on the surface of the carbon layer 2, and the lithium battery negative electrode pre-lithium release film is obtained.
Exemplarily, the utility model also provides a method for adopting above-mentioned lithium battery negative pole to carry out lithium battery negative pole 4 lithium in advance from type membrane, the flow chart is as shown in fig. 3, the method includes:
(1) Transferring the lithium battery negative electrode pre-lithium release film to the surface of a lithium battery negative electrode 4 by using a laminating roller with the laminating pressure of 0.1-2.5T, wherein the surface of one side of the lithium layer 3 of the lithium battery negative electrode pre-lithium release film is opposite to the surface of the lithium battery negative electrode 4;
(2) And uncovering the base film 1 of the lithium battery negative electrode pre-lithium release film to finish pre-lithium, and forming a lithium battery negative electrode 4, a lithium layer 3 and a carbon layer 2 which are sequentially stacked.
Optionally, the lithium battery negative electrode 4 includes any one of a graphite negative electrode, a silicon-carbon oxide negative electrode, and a lithium titanate negative electrode, or a combination of at least two of them.
Example 1
The embodiment provides a lithium battery negative electrode pre-lithium release film, as shown in fig. 2, comprising a base film 1 and a carbon layer 2 arranged on one side surface of the base film 1, wherein the carbon layer 2 is provided with a lithium layer 3 on one side surface far away from the base film 1, the base film 1 has a thickness of 36 μm, the carbon layer 2 has a thickness of 5 μm, and the lithium layer 3 has a thickness of 10 μm;
Example 2
The embodiment provides a lithium battery negative electrode pre-lithium release film, as shown in fig. 2, comprising a base film 1 and a carbon layer 2 arranged on one side surface of the base film 1, wherein the carbon layer 2 is provided with a lithium layer 3 on one side surface far away from the base film 1, the base film 1 has a thickness of 30 μm, the carbon layer 2 has a thickness of 2 μm, and the lithium layer 3 has a thickness of 15 μm;
Example 3
The embodiment provides a lithium battery negative electrode pre-lithium release film, as shown in fig. 1, comprising a base film 1 and a carbon layer 2 arranged on one side surface of the base film 1, wherein the carbon layer 2 is provided with a lithium layer 3 on one side surface far away from the base film 1, the base film 1 has a thickness of 40 μm, the carbon layer 2 has a thickness of 10 μm, and the lithium layer 3 has a thickness of 5 μm;
the base film 1 is a PET base film, the carbon layer 2 is an acetylene black layer, and the lithium layer 3 is a lithium metal layer.
Example 4
The same as in example 1 was repeated, except that the carbon layer 2 was 12 μm thick.
And (3) testing: transferring the lithium battery negative electrode pre-lithium release films of the examples 1-4 and the comparative example 1 to the surface of a lithium battery negative electrode 4 by using a laminating roller at a laminating pressure of 2T, removing the base film 1 to finish pre-lithium of the lithium battery negative electrode 4, observing the pre-lithium degree of the lithium battery negative electrode 4, namely the transfer degree of lithium metal on the lithium battery negative electrode pre-lithium release film, and recording the pre-lithium performance; the morphology of the lithium battery negative electrode 4 laminated by the laminating roller was observed, and the rolling performance was recorded, and the results are shown in table 1.
Comparative example 1
The procedure of example 1 was repeated except that the carbon layer 2 was not provided and silicone oil was directly applied to the PET base film.
TABLE 1
According to embodiments 1 to 4 of the present invention, the carbon layer 2 is disposed on the surface of the base film 1, so that the adhesion performance and the dispersion performance of the lithium metal in the lithium layer 3 are improved, and the cost is reduced; the lithium battery negative electrode pre-lithium release film is adopted for negative electrode pre-lithium, so that the contact area between lithium metal and the surface of a negative electrode can be increased, the conversion efficiency of the lithium metal converted into active lithium ions is improved, and the uniform coating of the lithium metal on the surface of the negative electrode is facilitated.
As can be seen from the comparison between example 1 and example 4, the lithium battery of the present invention has better pre-lithiation performance when the thickness of the lithium layer 3 is in the range of 0.1 to 10 μm, in cooperation with the base film 1 and the lithium layer 3; when the carbon layer 2 is thicker, the abnormal phenomenon is easy to occur during rolling, so that the pole piece is slightly deformed, or the phenomena of powder falling and the like are generated, and the distribution of the lithium layer 3 and the pre-lithium effect of the lithium battery negative electrode pre-lithium release film are influenced; meanwhile, if the carbon layer 2 is too thin, the transfer effect of lithium in the lithium layer is easily affected, so that the lithium is unevenly dispersed; thus, the pre-lithiation and calendering properties of example 1 are better than those of example 4.
It can be known through the contrast of embodiment 1 with comparative example 1, when direct coating silicon oil on the PET base film, not only the cost is improved, produce the problem that silicon oil distributes unevenly moreover easily, silicon oil self influences the pole piece performance, can't realize the utility model discloses a carbon-layer 2 improves the adhesion performance and the dispersion properties of lithium metal, improves the area of contact of lithium metal and negative pole surface, improves the conversion efficiency that lithium metal turned into active lithium ion, improves the even effect of laminating of lithium metal on the negative pole surface, consequently, compare with the comparative example, embodiment 1 has not only solved the problem of the influence of silicon oil to pole piece performance, has effectively reduced the cost in addition, has promoted the adhesion and the dispersion properties of lithium metal, reaches better lithium effect in advance.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (7)
1. The utility model provides a lithium battery negative pole is lithium from type membrane in advance which characterized in that, lithium battery negative pole is lithium from type membrane in advance includes the base film and sets up the carbon-layer of at least one side surface of base film, the carbon-layer is provided with the lithium layer at the side surface of keeping away from the base film.
2. The lithium battery negative electrode pre-lithium release film according to claim 1, wherein the carbon layer has a thickness of 0.1 to 10 μm.
3. The lithium battery negative electrode pre-lithiated release film according to claim 1, wherein the base film comprises a PET base film.
4. The lithium battery negative electrode pre-lithium release film according to claim 1, wherein the base film has a thickness of 20 to 50 μm.
5. The lithium battery negative electrode pre-lithiated release film according to claim 4, wherein the base film has a thickness of 35 to 37 μm.
6. The lithium battery negative electrode pre-lithium release film according to claim 1, wherein the thickness of the lithium layer is 1 to 20 μm.
7. The lithium battery negative electrode pre-lithium release film according to claim 1, wherein the lithium layer comprises at least one lithium band, the lithium band is distributed along the length or width direction of the lithium battery negative electrode pre-lithium release film, and the two adjacent lithium bands are not overlapped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221683262.9U CN218471984U (en) | 2022-06-30 | 2022-06-30 | Lithium battery negative electrode pre-lithium release film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221683262.9U CN218471984U (en) | 2022-06-30 | 2022-06-30 | Lithium battery negative electrode pre-lithium release film |
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| Publication Number | Publication Date |
|---|---|
| CN218471984U true CN218471984U (en) | 2023-02-10 |
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