CN112310342A - Lithium strip and lithium strip coiled material comprising same - Google Patents

Lithium strip and lithium strip coiled material comprising same Download PDF

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Publication number
CN112310342A
CN112310342A CN201910712661.XA CN201910712661A CN112310342A CN 112310342 A CN112310342 A CN 112310342A CN 201910712661 A CN201910712661 A CN 201910712661A CN 112310342 A CN112310342 A CN 112310342A
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lithium
section
width
calendering
rolling
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CN112310342B (en
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谢斌
龚志杰
陈仕通
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Metal Rolling (AREA)

Abstract

The invention provides a lithium strip and a lithium strip coiled material comprising the same, and relates to the field of lithium strips for batteries, wherein the lithium strip comprises a calendering initial section and a main body section which is integrally connected with the calendering initial section, and the width of the calendering initial section is smaller than that of the main body section; the ratio of the width H of any position of the rolling starting section to the width L of the main body section is more than or equal to 90% and less than 100%. The width of the initial calendering section of the lithium strip is smaller than that of the main body section of the lithium strip, so that the width of the initial calendering section of the obtained calendered lithium foil is more consistent with that of the main body section, the phenomenon of roller sticking of the calendered lithium foil cannot occur, the utilization rate of the lithium strip is high, the phenomenon of waste cannot occur, and the production cost is favorably reduced.

Description

Lithium strip and lithium strip coiled material comprising same
Technical Field
The invention relates to the field of lithium belts for batteries, in particular to a lithium belt and a lithium belt coiled material containing the same.
Background
With the popularization of new energy vehicles, the requirements of people on new energy vehicle batteries are more and more strict, for example, the batteries need to have high energy density, long cycle and stable performance and also have the capability of quick charging.
The cycling performance of the battery and its energy density can now be improved by techniques such as prelithiation. One of the prelithiation methods is to use a lithium foil formed by rolling a lithium ribbon in contact with a negative electrode. In the process of rolling the lithium strip, the lithium strip is soft, the initial rolling position of the lithium strip does not reach the balance under the action of tension and pressure, and at the moment, the width consistency of the lithium foil obtained after rolling the lithium strip is poor due to the imbalance of the tension and the pressure, so that the roll sticking problem is caused. Meanwhile, because the width of the lithium foil obtained after the lithium belt is rolled is not consistent, the lithium foil can be used only by further finishing after the lithium belt is rolled, so that the waste of raw materials is caused, and the steps of the process are increased.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In view of the problems in the background art, an object of the present invention is to provide a lithium ribbon and a lithium ribbon coil including the same, so as to solve the problem of inconsistent width of lithium foil during rolling of the lithium ribbon mentioned in the background art, thereby improving utilization rate of the lithium ribbon.
To achieve the above object, in a first aspect of the present invention, there is provided a lithium ribbon comprising:
the device comprises a rolling starting section and a main body section which is integrally connected with the rolling starting section, wherein the width of the rolling starting section is smaller than that of the main body section;
the ratio of the width H of any position of the rolling starting section to the width L of the main body section is more than or equal to 90% and less than 100%, and preferably 94% -98%.
In a second aspect of the present invention, there is provided a lithium strip coil comprising a roll and the lithium strip of the first aspect of the present invention wound on the roll.
Compared with the prior art, the invention can at least obtain the following beneficial effects:
the inventor of the invention finds that the middle part of the lithium belt can be narrowed under the action of tension when the lithium belt is rolled due to the softness of the lithium belt, and the width of the initial rolling section is wider than that of the lithium belt under the action of the balance because the initial rolling section does not reach the balance under the self-tension and the rolling pressure. The width of the rolling initial section of the lithium strip provided by the invention is smaller than that of the main body section, and the ratio of the width H at any position of the rolling initial section to the width L of the main body section is set to be greater than or equal to 90% and smaller than 100%, so that the width difference between the rolling initial section and the middle section can be effectively balanced, and the width of the rolled lithium foil of the lithium strip is kept high in consistency. Compared with the existing lithium belt with the same size, the lithium belt has the advantages that the width uniformity after rolling is high, the belt running length is short when the width of rolled lithium foil is stable, the phenomenon that rolled lithium foil is stuck to a roller cannot occur in the rolling process, the utilization rate of the lithium belt is high, the phenomenon of waste cannot occur, and the production cost is favorably reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a lithium ribbon in an embodiment of the present invention;
fig. 2 is a graph showing the width of a rolled lithium foil formed by rolling a lithium ribbon according to an embodiment of the present invention reaching a stable running length, and the width of a rolled lithium foil formed by rolling a lithium ribbon having a uniform width according to the prior art reaching a stable running length;
FIG. 3 is a schematic view of an embodiment of the present invention with a trapezoidal cross-sectional shape;
FIG. 4 is a schematic illustration of an embodiment of the present invention having a cross-sectional shape of a wedge-shaped hexagon;
FIG. 5 is a schematic view of the structure of a web in one embodiment of the present invention.
Among them, 100-lithium tape; 110-initial calendering stage; 120-a body segment; 200-a reel; 300-a substrate segment; 400-adhesive piece.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
In a first aspect of the present invention, referring to fig. 1, the lithium ribbon 100 includes a rolling start section 110 and a body section 120 integrally connected to the rolling start section 110, wherein a width of the rolling start section 110 is smaller than a width of the body section 120 from the body section 120 to the rolling start section 110, and a ratio of the width H at any position of the rolling start section 110 to the width L of the body section 120 is greater than or equal to 90% and less than 100% (e.g., may be 90%, 92%, 94%, 96%, 98%, 99%, etc.), and preferably 94% to 98%.
The lithium belt is soft, so that the middle part of the lithium belt can be narrowed under the action of tension during calendering, and the width of the initial calendering section is wider than that of the lithium belt under the action of stress balance because the initial calendering section does not reach the stress balance under the action of self tension and calendering pressure. The width of the rolling initial section of the lithium strip provided by the invention is smaller than that of the main body section, and the ratio of the width H at any position of the rolling initial section to the width L of the main body section is set to be greater than or equal to 90% and smaller than 100%, so that the width difference between the rolling initial section and the middle section can be effectively balanced, and the width of the rolled lithium foil of the lithium strip is kept high in consistency. Compared with the existing lithium belts with the same size, through a large number of experimental researches of the inventor, the lithium belt provided by the invention is found to be the lithium belt with a special initial end, the width ratio of the rolling initial section to the main body section of the lithium belt is set within a certain range, the consistency of the width after rolling is high, the belt running length is short when the width of the rolled lithium foil is stable (refer to fig. 2 specifically), the phenomenon that the rolled lithium foil is stuck to a roller cannot occur in the rolling process, the utilization rate of the lithium belt is high, the waste phenomenon cannot occur, and the production cost is favorably reduced.
It is to be understood that the structure of the specific rolling start stage is not limited in the present invention as long as the requirements of the present invention are satisfied. A lithium ribbon satisfying the above conditions can be obtained, for example, by shearing a calendering start segment having a uniform width.
Further, the length of the initial calendering section is 50mm to 400mm, preferably 150mm to 200 mm. For example, the length of the calendering initiation section can be 50mm, 80mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, or the like. When the length of the rolling start section is set to be within the above range, the width of the lithium ribbon in the rolled start section is more uniform, and the consistency between the width of the rolling start section and the width of the main body section is better. When the length of the initial rolling section is too short relative to the above length range, although the consistency of the rolled lithium foil is improved, the width of the initial rolling section is wider after rolling, the width consistency of the obtained rolled lithium foil is relatively poor, but the width consistency of the obtained rolled lithium foil is better than the effect of rolling the lithium strip with the same width in the prior art; when the length of the initial calendering section is too long, the width of a part of the initial calendering section is smaller than that of the main body section after calendering, the width consistency of the obtained calendered lithium foil is relatively poor, but the width consistency of the obtained calendered lithium foil is superior to the effect of calendering a lithium belt with the same width in the prior art, and the difficulty in the process is increased due to the overlong initial calendering section of the lithium belt, so that the length of the initial calendering section of the lithium belt is controlled within a reasonable range, and the final calendering effect of the lithium belt is favorably improved.
Further, the width of the rolling start section gradually decreases from the main body section to the rolling start section.
Although the invention does not make specific specification on the shape of the lithium strip rolling initial segment, the lithium strip rolling initial segment is designed into a gradually reduced structure in view of the process realization difficulty and the final effect, and the width size of the rolling initial segment can be prevented from generating jumping change in the rolling process. Although the consistency of the lithium foil rolled by the lithium ribbon can be improved as long as the width of the rolling initial section is smaller than that of the main body section, if the rolling initial section is not designed into a gradually-reduced structure, the situation that the width of the lithium foil changes along with the width of the lithium ribbon in a jumping manner can occur in the process of rolling the lithium ribbon into the lithium foil, the effect is not ideal enough, and the gradually-reduced structure is designed, so that the lithium foil is easier to realize from the perspective of the production process.
Further, the initial angle alpha of the rolling initial section at least has an obtuse angle.
The starting end angle α refers to an included angle between edges at the free end of the rolling starting section, and specifically, refer to fig. 1. The reason that the angle alpha of the starting end of the rolling starting section at least has an obtuse angle is to ensure that the width of the starting end of the rolling starting section is minimum and the width consistency of the lithium foil can be better improved in the rolling process of the lithium strip.
Further, the shape of the rolling start section is, for example, a trapezoid, preferably an isosceles trapezoid, and a lower base of the trapezoid is integrally connected to the main body section.
Through setting to trapezoidal, especially set to isosceles trapezoid, simple structure easily realizes, and the manufacturing of being convenient for, and isosceles trapezoid is because it has the symmetry for the lithium area is comparatively even at the process atress of calendering, thereby can improve the initial section of calendering and calendering width size's smoothness degree in the calendering process, considers the processing degree of difficulty and final effect, will when the initial section of calendering of lithium area sets up to isosceles trapezoid, the uniformity of lithium area through calendering back lithium foil is better. It is worth to be noted that the lower bottom edge of the trapezoid is integrally connected with the main body section, the lower bottom edge of the trapezoid is the limit that the width of one side, close to the main body section, of the calendaring starting section first reaches the width of the main body section, and the calendaring starting section and the main body section are integrally connected, so that the consistency of the calendered lithium foil of the lithium strip can be better guaranteed.
Further, the cross-sectional shape of the rolling start section may be, for example, a rectangle, a trapezoid, or a wedge-shaped hexagon.
The shape of cross section influences the uniformity among the lithium area calendering process, the cross sectional shape of calendering initial section can certain degree sign calendering initial section in the ascending roughness of lithium area thickness direction, at the in-process of designing the initial section of calendering, the ideal state is the cross section is the rectangle, and the width of the more accurate control of operating personnel of being convenient for calendering initial section compares with the width of main part section like this, but in actual production process, because the restriction of equipment technology, accomplish the rectangle with the cross section of calendering initial section usually and have certain degree of difficulty, consequently trapezoidal or wedge hexagon also can appear in the cross section of calendering initial section.
In some embodiments of the invention, the cross-sectional shape is rectangular. When the section is rectangular, the section of the obtained lithium strip rolling initial section with the special initial end in the thickness direction of the lithium strip is relatively flat, and an operator does not need to consider the influence caused by unevenness in the thickness direction when designing the width of the lithium strip rolling initial section, and only needs to design the width ratio of the width of the lithium strip rolling initial section to the width of the lithium strip main body section to be more than or equal to 90% and less than 100%.
In other embodiments of the present invention, the cross-sectional shape is a trapezoid having a minimum angle θ1Greater than or equal to 80 degrees and less than 90 degrees, theta1As shown in fig. 3. Theta1The angle of (a) will affect the uniformity of calendering of the lithium strip by theta1The angle of the lithium strip is controlled in a proper range, the flatness of the section can be limited in a certain range, the rolling consistency of the lithium strip can be effectively ensured, and the specific value of the angle is limited based on the conclusion obtained by a large number of experimental researches of the inventor.
In still other embodiments of the present invention, the cross-sectional shape is a wedge-shaped hexagon, and an angle θ formed in a thickness direction of the lithium ribbon is formed by the wedge-shaped hexagon280 ° or more and 180 ° or less, as shown in fig. 4, θ2The included angle between two adjacent side edges of the wedge-shaped hexagon in the thickness direction is formed. The reason for limiting the angle of the wedge-shaped hexagon is the same as above, and the description is omitted here.
In the present invention, the width and thickness of the main body segment of the lithium ribbon are not specifically limited, and the width of the rolling start segment may be limited according to the width of the main body segment.
Further, the width of the main body section is 60-350 mm, for example, the width of the main body section can be 60mm, 100mm, 150mm, 200mm, 250mm, 300mm or 350 mm. The width of the main body segment is selected to have certain influence on the final tape transport consistency, when the ratio of the width H at any position of the rolling starting segment 110 to the width L of the main body segment 120 is determined to be in a preferred range, the width of the starting segment is narrow after rolling when the width of the main body segment is large, the width consistency of the obtained rolled lithium foil is relatively poor, but the width consistency of the obtained rolled lithium foil is superior to the effect of rolling the lithium tape with the same width in the prior art; when the main body section is narrow, the width of the initial section is wide after rolling, the width consistency of the obtained rolled lithium foil is relatively poor, but the width consistency of the obtained rolled lithium foil is superior to the effect of rolling the lithium belt with the same width in the prior art.
Further, the thickness of the body segment may be, for example, 100 and 4000mm, for example, the thickness of the body segment may be 100mm, 500mm, 1000mm, 1500mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, and the like.
Further, the tensile strength of the lithium ribbon is 0.9 to 3.0MPa, and may be, for example, 0.9MPa, 1MPa, 1.2MPa, 1.4MPa, 1.6MPa, 1.8MPa, 2MPa, 2.2MPa, 2.4MPa, 2.6MPa, 2.8MPa or 3 MPa. Therefore, the lithium ribbon can not be broken in the calendering process, and the phenomenon that the calendering of the lithium ribbon is hindered due to overlarge tensile strength can be effectively prevented. Through multiple experiments, the inventor finds that the selection of lithium belts with different tensile strengths is crucial to the setting of the width H of the initial rolling section, and finally obtains the ratio of H to L to be set by using the lithium belts with different tensile strengths, and in some further preferred embodiments of the invention, the tensile strength of the lithium belts is 0.9-1.5 MPa.
Further, the elongation at break of the lithium ribbon is not less than 10%, for example, the elongation at break of the lithium ribbon may be 10%, 20%, 30%, or 40%. Therefore, in the process of rolling, the phenomenon of lithium strip breakage cannot occur, in the process of rolling the lithium strip, the problem of consistency of rolled lithium foil and lithium foil is not only required to be considered, the breakage derivative rate of the lithium strip is required to be noted and controlled, otherwise, the lithium strip breaks in the process of rolling, if the lithium strip breaks, the tension and stress imbalance condition can occur again in the process of rolling the next part of lithium strip at the end breaking position of the lithium strip, and the problem of unevenness of the rolled lithium foil of the lithium strip can be caused. Therefore, it should be noted that, in order to ensure better consistency of the lithium foil after the lithium ribbon is rolled, the elongation at break of the lithium ribbon needs to be properly controlled. Furthermore, the breaking elongation of the lithium belt is more than or equal to 25 percent.
In a second aspect of the present invention, the present invention provides a lithium strip coil, referring to fig. 5, including: a winding drum 200 and the lithium strip 100 of the first aspect of the present invention wound on the winding drum 200.
Since the lithium strip coil of the present invention includes the lithium strip of the present invention, the lithium strip coil of the present invention has all the advantages of the lithium strip of the present invention, and thus, will not be described in detail herein.
Further, referring to fig. 5, the winding drum 200 and the lithium ribbon 100 are connected by a substrate segment 300, wherein one end of the substrate segment 300 is connected to the winding drum 200, and the other end of the substrate segment 300 is connected to the main body segment 110.
Usually, the lithium strip coiled material needs to keep certain tension at the tail end of the lithium strip connected with the winding drum and the calendering position in the unreeling process, so that the tail end section of the lithium strip cannot be fully utilized, and the total length of the coiled material occupied by the length is larger, so that serious waste can be caused, and the production and processing cost is further improved. In the invention, the base material section can effectively replace the function of the end section of the lithium belt, so that the whole lithium belt can be fully utilized.
Further, the material of the substrate segment comprises one of a metal strip, a high polymer material strip or a composite material film, wherein the metal strip comprises but is not limited to one of a copper foil, an aluminum foil, a steel strip or a titanium strip; the high polymer material strip comprises but is not limited to one of Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and Polyimide (PI); the composite film material includes, but is not limited to, one of a fiberglass polymer, a release film, a release paper or a release paper. Therefore, the material source is wide, the price is low, and the strength is better; the material is not easy to absorb water, does not contain strong polar groups (carboxyl, hydroxyl, amido, cyano, carbonyl and the like), and has good service performance.
Further, the width of the substrate section is less than or equal to the width of the winding drum, the width of the winding drum is generally 40mm wider than that of the lithium belt, when the difference between the width of the winding drum and the width of the lithium belt exceeds 40mm, the length of the winding drum and the width of the roller of the equipment are increased, unnecessary waste is caused, and meanwhile, the wider the width, the higher the requirement on the consistency of tension is; the difference between the width of the substrate segment and the width of the main segment of the lithium ribbon is M, the preferred range of the ratio of M to the width of the main segment of the lithium ribbon is ± 5%.
Further, the length of the substrate section is greater than 0.4m, for example the length of the substrate section may be 0.4m, 0.6m, 0.8m, 1m, 1.2m, 1.4m, 1.6m, 1.8m, 2m or 2.2m, etc. Therefore, the lithium belt is favorably and fully utilized. Compared with the length range, when the width of the base material section is too short, a part of the lithium belt at the position of the main body section close to the winding drum cannot be fully utilized, and the waste of the lithium belt is caused. In some preferred embodiments of the invention, the length of the substrate segment is 1 to 1.2 m.
Further, referring to fig. 5, the winding drum 200 and the substrate segment 300 and the lithium ribbon 100 and the substrate segment 300 are connected by a bonding member 400. The adhesive can thereby firmly connect the lithium strip, the substrate section and/or the reel together.
Further, the adhesive force of the adhesive is larger than 60N. Therefore, the unwinding device cannot be broken in the unwinding process. When the tensile strength of the adhesive member is too small, the adhesive member is easily broken in the unwinding process.
Furthermore, the material of the bonding piece comprises yellow glue, green glue, blue glue, plastic adhesive tape, insulating adhesive tape and the like. The bonding piece is not easy to absorb water, does not contain strong polar groups (carboxyl, hydroxyl, amido, cyano-group, carbonyl and the like), and can effectively prevent the oxidation of the lithium belt.
The invention is further illustrated by the following specific examples, which, however, are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
Preparation of lithium tapes in examples 1 to 16 and comparative examples 1 to 2:
the lithium tapes of examples 1 to 16 and comparative example 2 were obtained by knife shearing according to the parameters in table 1, in which:
the shapes of the end faces of the rolling initial sections described in examples 1 to 11 and comparative example 2 were obtained by cutting the lithium strip with a single blade in the thickness direction, and the cutting action time was 0 to 1S, thus obtaining the end faces of the rolling initial sections in a rectangular shape, while those of examples 12 to 13 were obtained by cutting the lithium strip with a single blade in the thickness direction, and the cutting action time was > 1S, thus obtaining the end faces of the rolling initial sections in a trapezoidal shape;
the examples 14-16 are obtained by double-blade shearing (such as scissors) in the thickness direction of the lithium strip, the shearing action time is more than 1S, and the shape of the end surface of the initial rolling section is a wedge-shaped hexagon;
the lithium tape in comparative example 1 was not sheared;
examples 1 to 16 and comparative example 2 are each a lithium ribbon coil, the structure of which is shown in fig. 5. The properties of the lithium strip coils of examples 1 to 16 and comparative example 2 are shown in table 1.
Comparative example 1 is also a lithium ribbon coil whose structure differs from that of fig. 5 in that: the lithium ribbon in comparative example 1 was not sheared and had no initial stage of calendering.
Each parameter and performance test in examples 1 to 16 and comparative examples 1 to 2
Lithium ribbon width and substrate segment width: the width of the lithium tape was measured using a millimeter-sized tape.
Thickness of the lithium ribbon: and testing the thickness of the lithium belt by adopting a micrometer or a ten-thousandth micrometer.
Rolled lithium foil width to stable tape length: when the rolled width and the stabilized width of the lithium ribbon are consistent, the length of the ribbon is measured by a meter ruler.
Specific numerical values of the width of the main body segment, the ratio of the width H of the rolling start segment to the width L of the main body segment, the length of the rolling start segment, the shape of the rolling start segment, the sectional shape of the rolling start segment, and the minimum angle of the sectional shape of the rolling start segment in the lithium ribbon coils of examples 1 to 16 and comparative examples 1 to 2 are shown in table 1.
TABLE 1
Figure BDA0002154299730000101
Figure BDA0002154299730000111
The rolled lithium foil widths obtained by rolling in the lithium strip coils of examples 1 to 16 and comparative examples 1 to 2 reached a stable running length (denoted B) as shown in table 1.
As can be seen from the data in table 1, specific values of the width of the main body segment of the lithium ribbon, the ratio of the width H of the rolling start segment to the width L of the main body segment, the length of the rolling start segment, the shape of the rolling start segment, the cross-sectional shape of the rolling start segment, and the minimum angle of the cross-sectional shape of the rolling start segment have certain influence on the stable running length of the rolled lithium foil width, and the optimal effect can be achieved through the optimal combination of the parameters. In contrast, in comparative examples 1 to 2, when the ratio of the width H of the rolling start section to the width L of the main body section of the lithium ribbon exceeds the range defined in the present invention, the running length for achieving the stable width of the rolled lithium foil is longer, which results in waste of the lithium ribbon.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims (10)

1. A lithium ribbon, comprising:
the device comprises a rolling starting section and a main body section which is integrally connected with the rolling starting section, wherein the width of the rolling starting section is smaller than that of the main body section;
the ratio of the width H of any position of the rolling starting section to the width L of the main body section is more than or equal to 90% and less than 100%, and preferably 94% -98%.
2. Lithium strip according to claim 1, characterized in that the length of the calendering initiation section is between 50mm and 400mm, preferably between 150mm and 200 mm.
3. The lithium ribbon of claim 1, wherein the width of the calendering initiation section gradually decreases from the body section to the calendering initiation section.
4. The lithium ribbon according to claim 3, wherein the start angle α of the calendering start is at least an obtuse angle;
preferably, the shape of the calendering initiation section is a trapezoid, preferably an isosceles trapezoid, the lower base of the trapezoid being integrally connected to the main body section.
5. The lithium ribbon of claim 1, wherein the cross-sectional shape of the calendering initiation section is selected from the group consisting of rectangular, trapezoidal, and wedge-shaped hexagonal.
6. The lithium ribbon of claim 5, wherein the cross-sectional shape is rectangular.
7. The lithium ribbon of claim 5, wherein the cross-sectional shape is a trapezoid having a smallest angle θ1Greater than or equal to 80 degrees and less than 90 degrees.
8. The lithium ribbon of claim 5, wherein the cross-sectional shape is a wedge-shaped hexagon, and the wedge-shaped hexagon forms an angle θ in a thickness direction of the lithium ribbon2Greater than or equal to 80 degrees and less than 180 degrees.
9. The lithium ribbon of claim 1, wherein the width of the body segment is 60mm to 350 mm.
10. A lithium ribbon coil comprising a roll and the lithium ribbon of any one of claims 1 to 9 wound on the roll.
CN201910712661.XA 2019-08-02 2019-08-02 Lithium strip and lithium strip coiled material comprising same Active CN112310342B (en)

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CN201910712661.XA CN112310342B (en) 2019-08-02 2019-08-02 Lithium strip and lithium strip coiled material comprising same
PCT/CN2020/102999 WO2021022997A1 (en) 2019-08-02 2020-07-20 Lithium strip and lithium strip coil having same

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