CN210668538U - Electrode plate and lithium ion battery thereof - Google Patents
Electrode plate and lithium ion battery thereof Download PDFInfo
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- CN210668538U CN210668538U CN201921877590.0U CN201921877590U CN210668538U CN 210668538 U CN210668538 U CN 210668538U CN 201921877590 U CN201921877590 U CN 201921877590U CN 210668538 U CN210668538 U CN 210668538U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a battery technology field, concretely relates to electrode plate and lithium ion battery thereof. The utility model provides an electrode plate, include: the surface of the carbon-containing conductive coating, which is far away from the current collector, comprises at least one first area surface and at least one second area surface, the first area surface and the second area surface are alternately arranged, a plurality of carbon black particle units and a plurality of graphene particle units are distributed on the first area surface, and the carbon black particle units and the graphene particle units are arranged in parallel; and the active material layer is arranged on the surface of the carbon-containing conductive coating layer, which is far away from the current collector, and covers the first area surface, the carbon black particle unit, the graphene particle unit and the second area surface. Through the arrangement, the contact area of the carbon-containing conductive coating and the active material layer can be effectively increased, the binding force of the current collector and the active material is improved, and the performance of the battery is improved.
Description
Technical Field
The utility model relates to a battery technology field, concretely relates to electrode plate and lithium ion battery thereof.
Background
With the continuous development of electronic and energy technologies, people are facing CO2And the attention on the emission of automobile exhaust is continuously increased, and the electric automobile becomes the development trend in the future. As one of the core components of electric vehicles, research and application of lithium ion batteries are receiving attention. The electrode plate of the existing lithium ion battery is composed of a metal current collector and an electrode active material coated on the surface of the current collector. However, the bonding force between the metal current collector and the electrode active material is not high, and in order to improve the bonding force between the metal current collector and the electrode active material, a binder with a high proportion is added in the conventional method.
In order to solve the above problems, the prior art is mainly improved by the following means: (1) modifying the positive and negative electrode active materials; (2) an improvement conductive agent; (3) improving the electrolyte and the diaphragm; (4) improving the manufacturing process of the battery; (5) the current collector is improved. Of which the improvement is most rapid and the effect is remarkable, among which the application is most widespread with current collectors with conductive coatings. However, only coating the conductive coating on the surface of the metal current collector has a poor effect on improving the binding force between the metal current collector and the electrode active material, and has an insignificant effect on reducing the internal resistance of the battery and the polarization effect during rapid charging and discharging.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome only in the prior art at the metal mass flow body surface coating conductive coating to promoting the metal mass flow body and the cohesion of electrode active material, reduce the internal resistance of battery and the not good problem of polarization effect, and then provide an electrode plate and lithium ion battery thereof.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an electrode sheet comprising:
a current collector having first and second oppositely disposed surfaces;
the surface, far away from the current collector, of the carbon-containing conductive coating comprises at least one first area surface and at least one second area surface, the first area surfaces and the second area surfaces are alternately arranged, a plurality of carbon black particle units and a plurality of graphene particle units are distributed on the first area surfaces, and the carbon black particle units and the graphene particle units are arranged in parallel;
and the active material layer is arranged on the surface of the carbon-containing conductive coating layer, which is far away from the current collector, and covers the first area surface, the carbon black particle unit, the graphene particle unit and the second area surface.
Optionally, in the length direction of the electrode, the carbon black particle unit and the graphene particle unit both have a flat structure, and the flat structure is parallel to the current collector and is disposed on the carbon-containing conductive coating.
Optionally, the cross-sectional shape of the carbon black particle unit and the graphene particle unit along the length direction of the electrode is at least one of a circle, an ellipse and a rectangle.
Optionally, the length of the carbon black particle unit and the length of the graphene particle unit in the length direction of the electrode plate are 0.3-1.5 μm, and the thickness perpendicular to the electrode plate is 0.1-1 μm.
Optionally, along in the electrode pole piece width direction, the carbonaceous conductive coating is kept away from the intermediate position on the surface of the current collector is the first district face, the both sides of first district face are equallyd divide cloth have the second district face.
Optionally, in the width direction of the electrode plate, the sum of the widths of the first area surfaces is 30-40% of the sum of the widths of the second area surfaces.
Optionally, the thickness of the first area surface is 2 to 5 μm, and the thickness of the second area surface is 2 to 5 μm.
Optionally, the material of the carbon-containing conductive coating is graphene.
Optionally, the current collector is made of copper foil or aluminum foil.
The utility model also provides a lithium ion battery, including the aforesaid electrode sheet.
The utility model has the advantages that:
the utility model provides an electrode plate sets up the carbonaceous conductive coating on the first surface of the mass flow body, along the width direction of electrode plate, the surface that the carbonaceous conductive coating kept away from the mass flow body includes at least one first district face and at least one second district face, first district face and second district face set up alternately, a plurality of carbon black granule units and a plurality of graphite alkene granule units are arranged on the first district face, carbon black granule unit and graphite alkene granule unit parallel arrangement; and then, arranging an active material layer on the carbon-containing conductive coating, and covering the first area surface, the carbon black particle units and the graphene particle units on the first area surface and the second area surface. Through the arrangement, the contact area of the carbon-containing conductive coating and the active material layer can be effectively increased by the carbon black particle unit and the graphene particle unit which are positioned on the surface of the first area, so that the binding force of the current collector and the active material is improved, and meanwhile, the internal resistance of the battery can be effectively reduced by the carbon black particle unit and the graphene particle unit which are arranged in parallel, so that the performance of the battery is greatly improved.
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 embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a side view of an electrode plate of the present invention;
fig. 2 is a top view of the carbon-containing conductive coating of the present invention.
1. A current collector; 2. a carbon-containing conductive coating; 3. an active material layer; 4. a first surface; 5. a second surface; 6. a first area surface; 7. a second area surface; 8. a carbon black particle unit; 9. graphene particle units.
Detailed Description
The technical solution of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, 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 in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The utility model provides an electrode plate, as shown in figure 1 and figure 2, wherein, the direction that X arrow point shows is electrode plate width direction, and the direction that Y arrow point shows is electrode plate's length direction, electrode plate includes: a current collector 1 having a first surface 4 and a second surface 5 disposed opposite; the carbon-containing conductive coating 2 is arranged on the first surface 4 of the current collector 1, the surface, far away from the current collector 1, of the carbon-containing conductive coating 2 comprises at least one first area surface 6 and at least one second area surface 7 along the width direction of the electrode pole piece, the first area surface 6 and the second area surface 7 are alternately arranged, a plurality of carbon black particle units 8 and a plurality of graphene particle units 9 are distributed on the first area surface 6, and the carbon black particle units 8 and the graphene particle units 9 are arranged in parallel; and the active material layer 3 is arranged on the surface of the carbon-containing conductive coating 2, which is far away from the current collector 1, and covers the first area surface 6, the carbon black particle units 8, the graphene particle units 9 and the second area surface 7.
The utility model provides an electrode plate sets up carbonaceous conductive coating 2 on the first surface 4 of mass flow body 1, along the width direction of electrode plate, the surface that carbonaceous conductive coating 2 kept away from the mass flow body 1 includes at least one first district face 6 and at least one second district face 7, first district face 6 and second district face 7 set up alternately, arrange a plurality of carbon black granule units 8 and a plurality of graphite alkene granule unit 9 on the first district face 6, carbon black granule unit 8 and graphite alkene granule unit 9 parallel arrangement; then, an active material layer 3 is disposed on the carbon-containing conductive coating layer 2, and covers the first area surface 6 and the carbon black particle units 8 and the graphene particle units 9 thereon, and the second area surface 7. Through the above arrangement, the carbon black particle units 8 and the graphene particle units 9 on the surface of the first area surface 6 can effectively increase the contact area between the carbon-containing conductive coating 2 and the active material layer 3, so that the binding force between the current collector 1 and the active material is improved, and meanwhile, the carbon black particle units 8 and the graphene particle units 9 arranged in parallel can also effectively reduce the internal resistance of the battery, so that the performance of the battery is greatly improved.
The utility model discloses it is not right second district face 7 does specifically prescribe a limit to, optional, the surface of second district face 7 is smooth planar structure.
In the present invention, the carbonaceous material in the carbonaceous conductive coating layer 2 is conventional and existing carbonaceous material in the art, the carbon black particles and the graphene particles are conventional and existing material in the art, and the active material in the active material layer 3 is conventional and existing active material in the art; the carbon black particle unit 8 contains carbon black particles, and optionally, the carbon black particle unit 8 contains at least 1 carbon black particle; the graphene particle unit 9 contains graphene particles, and optionally, the graphene particle unit 9 contains at least 1 graphene particle.
In an alternative embodiment, the carbon black particle unit 8 and the graphene particle unit 9 each have a flat structure along the length direction of the electrode, and the flat structure is disposed on the carbon-containing conductive coating 2 in parallel with the current collector 1. The utility model discloses a set up carbon black granule unit 8 and graphite alkene granule unit 9 into the area of contact that the platykurtic structure can further increase carbonaceous conductive coating 2 and active material layer 3, and then further improve mass flow body 1 and active material's cohesion. It is found through research that the arrangement of the carbon black particle units 8 and the graphene particle units 9 in a flat structure is also beneficial to reducing the internal resistance and polarization of the battery. Optionally, the cross-sectional shapes of the carbon black particle units 8 and the graphene particle units 9 in the length direction of the electrode are at least one of circular, oval and rectangular. Optionally, the cross-sectional shapes of the carbon black particle unit 8 and the graphene particle unit 9 along the length direction of the electrode are rectangles.
The utility model discloses do not do specifically inject the length and the thickness of carbon black granule unit 8 and graphite alkene granule unit 9. Optionally, the length of the carbon black particle unit 8 and the graphene particle unit 9 in the length direction of the electrode plate is 0.3-1.5 μm, and the thickness perpendicular to the electrode plate is 0.1-1 μm. Optionally, the lengths of the carbon black particle units 8 and the graphene particle units 9 in the length direction of the electrode plate are 0.5-1.0 μm, and the thickness perpendicular to the electrode plate is 0.1-0.5 μm.
The utility model discloses do not do specifically to the quantity of first district face 6 and second district face 7 and restrict, optional, first district face 6 sets up one at least, second district face 7 sets up two at least. In an alternative embodiment, the number of the first areas 6 is 1, and the number of the second areas 7 is 2. In an optional embodiment, in the width direction of the electrode pole piece, the middle position of the surface of the carbon-containing conductive coating 2 away from the current collector 1 is the first area surface 6, and the second area surfaces 7 are distributed on both sides of the first area surface 6. The utility model discloses a set up first district face 6 in 2 intermediate positions of carbonaceous conductive coating the both sides of first district face 6 set up second district face 7, make it more do benefit to the internal resistance and the polarization that reduce the battery.
The utility model discloses do not do specifically to the width and the thickness of first district face 6 and second district face 7 and restrict, optional, follow in the electrode sheet width direction, the width sum of first district face 6 is 30-40% of the width sum of second district face 7. Optionally, the thickness of the first area surface 6 is 2-5 μm, and the thickness of the second area surface 7 is 2-5 μm. The utility model discloses in, the thickness of first district face 6 and second district face 7 can be the same, also can be different, preferred, the thickness of first district face 6 is the same with the thickness of second district face 7, so be provided with and do benefit to the cohesion that improves mass flow body 1 and active material.
In an optional embodiment, the current collector 1 is made of copper foil or aluminum foil; the material of the carbon-containing conductive coating 2 is graphene. The utility model discloses regard as 2 materials on carbonaceous conductive coating with graphite alkene to cooperation carbon black granule and graphite alkene granule, when reinforcing mass flow body 1 and active material cohesion, still effectively reduced battery resistance.
The utility model discloses do not do the specific restriction to the material of active material layer 3, optional, when the electrode is anodal, the material can be lithium cobaltate, lithium iron phosphate, lithium manganate etc. in the active material layer 3; when the electrode is a negative electrode, the material in the active material layer 3 may be artificial graphite or the like.
In the present invention, the preparation method of the electrode plate is a conventional preparation method in the field. Optionally, the utility model discloses in set up carbonaceous conductive coating 2 on the current collector 1 surface and can adopt the mode of wet process coating to go on, also can adopt chemical vapor deposition method (CVD) deposit carbonaceous conductive coating 2 on current collector 1. In an optional embodiment, the electrode plate is a lithium ion battery positive electrode plate, and the preparation method of the lithium ion battery positive electrode plate includes the following steps: 1) grinding graphene, and mixing with a binder and a solvent to prepare graphene slurry; 2) coating the graphene slurry on a first surface 4 of a current collector 1 (aluminum foil), dividing the current collector into a first area surface 6 and a second area surface 7, baking to remove part of the solvent, distributing carbon black particles and graphene particles in parallel (spraying and other means can be adopted) on the surface of the first area surface 6, and continuously baking to remove the residual solvent to obtain a graphene conductive coating; 3) preparing conventional positive electrode materials including lithium iron phosphate and the like into slurry, coating the slurry on a graphene conductive coating formed on a current collector 1, baking to remove a solvent, and carrying out cold pressing to obtain the positive electrode piece of the lithium ion battery. The solvent, the binder, the anode material and the like in the utility model are conventional choices in the field, wherein the related parameters, such as temperature and the proportion among the components are conventional choices in the field.
The invention also provides a lithium ion battery which comprises the electrode pole piece. In an optional embodiment, the lithium ion battery comprises a positive electrode plate, a negative electrode plate, an isolating membrane and an electrolyte, wherein the positive electrode plate is the electrode plate, and the negative electrode plate is a conventional negative electrode plate in the field. The inventor of the invention has found that, under the condition that the preparation process and the material components are the same, when the surface of the first region surface 6 of the positive electrode plate contains the carbon black particle unit 8 and the graphene particle unit 9 which are arranged in parallel, the initial direct current impedance of the lithium ion battery prepared by the positive electrode plate is reduced by 10% compared with the positive electrode plate without the carbon black particle unit 8 and the graphene particle unit 9.
The technical solution of the present invention is described below by the following embodiments:
example 1
The present embodiment provides an electrode plate, including: a current collector 1 having a first surface 4 and a second surface 5 disposed opposite; the carbon-containing conductive coating 2 is arranged on the first surface 4 of the current collector 1, the surface, far away from the current collector 1, of the carbon-containing conductive coating 2 comprises at least one first area surface 6 and at least one second area surface 7 along the width direction of the electrode pole piece, the first area surface 6 and the second area surface 7 are alternately arranged, a plurality of carbon black particle units 8 and a plurality of graphene particle units 9 are distributed on the first area surface 6, and the carbon black particle units 8 and the graphene particle units 9 are arranged in parallel; and the active material layer 3 is arranged on the surface of the carbon-containing conductive coating 2, which is far away from the current collector 1, and covers the first area surface 6, the carbon black particle units 8, the graphene particle units 9 and the second area surface 7.
Optionally, along the length direction of the electrode, the carbon black particle unit 8 and the graphene particle unit 9 both have a flat structure, and the flat structure is arranged on the carbon-containing conductive coating 2 in parallel with the current collector 1. Optionally, the cross-sectional shapes of the carbon black particle units 8 and the graphene particle units 9 in the length direction of the electrode are at least one of circular, oval and rectangular. Optionally, the length of the carbon black particle unit 8 and the graphene particle unit 9 in the length direction of the electrode plate is 0.3-1.5 μm, and the thickness perpendicular to the electrode plate is 0.1-1 μm.
Example 2
This embodiment provides an electrode plate, on the basis of above-mentioned embodiment 1, along the electrode plate width direction, the middle position on the surface that carbonaceous conductive coating 2 keeps away from current collector 1 is first district face 6, evenly distribute on both sides of first district face 6 have second district face 7. Optionally, in the width direction of the electrode plate, the sum of the widths of the first area surfaces 6 is 30-40% of the sum of the widths of the second area surfaces 7. Optionally, the thickness of the first area surface 6 is 2-5 μm, and the thickness of the second area surface 7 is 2-5 μm. Optionally, the material of the carbon-containing conductive coating 2 is graphene. Optionally, the current collector 1 is made of copper foil or aluminum foil.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. An electrode sheet, comprising:
a current collector having first and second oppositely disposed surfaces;
the surface, far away from the current collector, of the carbon-containing conductive coating comprises at least one first area surface and at least one second area surface, the first area surfaces and the second area surfaces are alternately arranged, a plurality of carbon black particle units and a plurality of graphene particle units are distributed on the first area surfaces, and the carbon black particle units and the graphene particle units are arranged in parallel;
and the active material layer is arranged on the surface of the carbon-containing conductive coating layer, which is far away from the current collector, and covers the first area surface, the carbon black particle unit, the graphene particle unit and the second area surface.
2. The electrode sheet according to claim 1, wherein the carbon black particle unit and the graphene particle unit each have a flat structure in a length direction of the electrode, and the flat structure is disposed on the carbonaceous conductive coating in parallel to the current collector.
3. The electrode sheet according to claim 1 or 2, wherein the carbon black particle unit and the graphene particle unit have at least one of a circular, an oval and a rectangular cross-sectional shape in a longitudinal direction of the electrode.
4. The electrode sheet according to claim 3, wherein the carbon black particle unit and the graphene particle unit have a length of 0.3-1.5 μm in a length direction of the electrode sheet and a thickness of 0.1-1 μm perpendicular to the electrode sheet.
5. The electrode piece according to claim 4, wherein the middle position of the surface of the carbon-containing conductive coating layer far away from the current collector in the width direction of the electrode piece is the first area surface, and the second area surface is distributed on both sides of the first area surface.
6. The electrode pad of claim 5, wherein the sum of the widths of the first land is 30-40% of the sum of the widths of the second land along the width direction of the electrode pad.
7. The electrode tab of claim 6, wherein the first land has a thickness of 2-5 μm and the second land has a thickness of 2-5 μm.
8. The electrode sheet according to claim 1, wherein the material of the carbon-containing conductive coating is graphene.
9. The electrode sheet according to claim 8, wherein the material of the current collector is copper foil or aluminum foil.
10. A lithium ion battery comprising the electrode sheet of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921877590.0U CN210668538U (en) | 2019-10-31 | 2019-10-31 | Electrode plate and lithium ion battery thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921877590.0U CN210668538U (en) | 2019-10-31 | 2019-10-31 | Electrode plate and lithium ion battery thereof |
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| CN210668538U true CN210668538U (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156423A (en) * | 2020-09-08 | 2022-03-08 | 东莞新能安科技有限公司 | Pole piece, battery and electronic device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156423A (en) * | 2020-09-08 | 2022-03-08 | 东莞新能安科技有限公司 | Pole piece, battery and electronic device |
| CN114156423B (en) * | 2020-09-08 | 2023-10-03 | 东莞新能安科技有限公司 | Pole piece, battery and electronic device |
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