CN218414631U - Pole piece structure for improving cycle performance of lithium battery and lithium ion battery - Google Patents
Pole piece structure for improving cycle performance of lithium battery and lithium ion battery Download PDFInfo
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- CN218414631U CN218414631U CN202222208422.0U CN202222208422U CN218414631U CN 218414631 U CN218414631 U CN 218414631U CN 202222208422 U CN202222208422 U CN 202222208422U CN 218414631 U CN218414631 U CN 218414631U
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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 belongs to the technical field of battery production and manufacture, in particular to a pole piece structure for improving the cycle performance of a lithium battery, which comprises a current collector; the silicon-carbon coating is coated on the surface of the current collector; the graphite coating is coated above the silicon-carbon coating; and the conductive bonding layer is arranged between the silicon-carbon coating and the graphite coating. The utility model discloses an optimize the pole piece structure, improve each inter-layer contact of battery cycle charge-discharge in-process, help improving the quality of battery.
Description
Technical Field
The utility model belongs to the technical field of battery production manufacturing, concretely relates to a pole piece structure and lithium ion battery for improving lithium cell cycle performance.
Background
The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
The energy density of the consumer battery is improved year by year, the energy density can be effectively improved by doping silicon materials, but the silicon-oxygen conductivity is poor, the charging window is deteriorated, and the rapid decay of the retention rate of the circulating capacity is mainly caused by lithium separation.
In order to improve the charging capacity of the silicon-carbon cathode, the graphite material can be coated on the upper layer of the silicon-carbon cathode, so that the problem of lithium precipitation in the charging and discharging process of the cathode pole piece can be effectively solved, and the cycle performance of the battery cell is improved.
Because the materials of the multilayer coating pole pieces are different, the expansion of the silicon material is far larger than that of graphite, and the coatings can be layered in the circulating process or the repeated charging and discharging process, so that the contact among the layers is problematic, and the circulating performance of the battery cell is influenced.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model lies in: aiming at the defects of the prior art, the pole piece structure for improving the cycle performance of the lithium battery is provided, and the contact among all layers in the cycle charge and discharge process of the battery is improved by optimizing the pole piece structure, so that the quality of the battery is improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a pole piece structure for improving the cycle performance of a lithium battery comprises a current collector; the silicon-carbon coating is coated on the surface of the current collector; the graphite coating is coated above the silicon-carbon coating; and the conductive bonding layer is arranged between the silicon-carbon coating and the graphite coating.
Preferably, the conductive adhesive layer is a mixed solution of an acrylic glue solution and a carbon nanotube.
Preferably, the conductive adhesive layer is formed between the silicon carbon coating and the graphite coating by spraying.
Preferably, the ratio of the areal density of the graphite coating to the silicon carbon coating is less than 4.5/5.5.
Preferably, the conductive adhesive layer is lattice-shaped, strip-shaped or layered.
Preferably, the conductive bonding layer comprises a plurality of connection points, and the connection points are uniformly distributed on the surface of the silicon-carbon coating.
Preferably, the conductive adhesive layer includes a plurality of connection bands arranged side by side, and the plurality of connection bands extend in a length direction or a width direction.
Preferably, the conductive adhesive layer has a connection surface, and the area of the connection surface is smaller than or equal to the area of the silicon-carbon coating.
Preferably, the thickness of the conductive adhesive layer is smaller than the silicon-carbon coating or the graphite coating.
A second object of the utility model is to provide a lithium ion battery, including foretell the pole piece structure that is used for improving lithium cell cycle performance.
The beneficial effects of the utility model reside in that, the utility model discloses the electrically conductive adhesive linkage of spraying between silicon carbon coating and graphite coating, the inflation difference of avoiding silicon carbon coating and graphite coating leads to the layer contact failure, and electrically conductive adhesive linkage includes acrylic acid glue solution and carbon nanotube, the acrylic acid glue solution respectively with decide silicon carbon coating and graphite coating adhesion, reduce the condition of the layering of battery circulation in-process, play the effect of fixed silicon carbon coating and graphite coating, carbon nanotube plays the effect that the electron switched on to promote electric core cyclicity ability.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic diagram of the distribution of connection points according to the first embodiment of the present invention.
Fig. 3 is a schematic view of coating according to a first embodiment of the present invention.
Fig. 4 is a schematic structural view of a second embodiment of the present invention.
Fig. 5 is a schematic view of the distribution of the connection belt according to the second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 7 is a schematic view of the distribution of the connection surfaces according to the third embodiment of the present invention.
Wherein the reference numerals are as follows:
1-a silicon carbon coating;
2-graphite coating;
3-a conductive adhesive layer; 31-a connection point; 32-a connecting band; 33-connecting surface.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, 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 according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to fig. 1 to 7, but the present invention is not limited thereto.
Implementation mode one
The first embodiment will be described with reference to fig. 1 to 3
The pole piece structure for improving the cycle performance of the lithium battery comprises a current collector; the silicon-carbon coating 1 is coated on the surface of the current collector; the graphite coating 2 is coated above the silicon-carbon coating 1; and the conductive bonding layer 3 is arranged between the silicon-carbon coating 1 and the graphite coating 2.
Because the material of multilayer coating pole piece is different, the expansion of silicon material is far more than graphite inflation, in cycle process or repeated charge-discharge process, layering can appear between the coating, lead to contact between each layer to go wrong, influence electric core circulation performance, therefore, spraying electrically conductive adhesive linkage 3 between silicon carbon coating 1 and graphite coating 2, avoid the expansion difference of silicon carbon coating 1 and graphite coating 2 to lead to the layer contact failure, electrically conductive adhesive linkage 3 includes acrylic acid glue solution and carbon nanotube, acrylic acid glue solution respectively with decide silicon carbon coating 1 and graphite coating 2 adhesion, reduce the condition of layering in the battery circulation process, play the effect of fixed silicon carbon coating 1 and graphite coating 2, carbon nanotube plays the effect that the electron switched on, thereby promote electric core circulation performance.
According to the utility model discloses an among the pole piece structure for improving lithium cell cycle performance, electrically conductive adhesive linkage 3 is that acrylic acid glue solution and carbon nanotube mix the liquid, and electrically conductive adhesive linkage 3 forms between silicon carbon coating 1 and graphite coating 2 through the spraying. In the present embodiment, when the silicon carbon coating 1 and the graphite coating 2 are coated, the mixture of acrylic glue and carbon nanotubes is also sprayed between the two layers, as shown in fig. 3, wherein the carbon nanotubes have a long-chain structure for facilitating the conduction of electrons. Specifically, the upper die head is coated with the graphite coating 2, the lower die head is coated with the silicon-carbon coating 1, and the nozzle device is added in the middle, so that a mixed liquid of a dot-shaped acrylic glue solution and a carbon nano tube can be sprayed. The showerhead device includes, but is not limited to, a feed system and a die cavity.
In the pole piece structure for improving the cycle performance of the lithium battery, the ratio of the surface density of the graphite coating 2 to the surface density of the silicon-carbon coating 1 is less than 4.5/5.5. In some embodiments, the silicon carbon coating 1 has an areal density window value of 55-95mg/1540.25mm 2 However, the present invention is not limited to this, and the ratio of the surface density of the graphite coating 2 to the surface density of the silicon-carbon coating 1 may be satisfied.
According to the utility model discloses an in the pole piece structure for improving lithium cell cycle performance, electrically conductive adhesive linkage 3 is the dot matrix form, and electrically conductive adhesive linkage 3 includes a plurality of tie points 31, a plurality of tie points 31 equipartitions and silicon carbon coating 1's surface. Specifically, lattice-shaped connection points 31 are added between the silicon-carbon coating 1 and the graphite coating 2, and each layer is connected in a rivet-like manner between the silicon-carbon coating 1 and the graphite coating 2, so that each layer is fixed.
The utility model discloses a theory of operation is:
spraying electrically conductive adhesive linkage 3 between silicon carbon coating 1 and graphite coating 2, avoid silicon carbon coating 1 and graphite coating 2's expansion difference to lead to the layer contact failure, electrically conductive adhesive linkage 3 includes acrylic acid glue solution and carbon nanotube, acrylic acid glue solution respectively with decide silicon carbon coating 1 and graphite coating 2 adhesion, reduce the condition of the layering of battery circulation in-process, play the effect of fixed silicon carbon coating 1 and graphite coating 2, carbon nanotube plays the effect that the electron switched on, thereby promote electric core cyclicity ability.
Second embodiment
The difference from the first embodiment is that: the conductive adhesive layer 3 of the present embodiment is a strip, the conductive adhesive layer 3 includes a plurality of connecting strips 32 arranged side by side, and the plurality of connecting strips 32 extend in the length direction or the width direction. In this embodiment, the plurality of connection bands 32 are uniformly spaced, and the connection bands 32 extend from one side of the silicon-carbon coating 1 to the other side of the silicon-carbon coating 1, which is helpful to increase the overall adhesion area of the conductive adhesive layer 3, so as to adhere the upper and lower coatings, reduce the layering of the battery in the cycle process, improve the interlayer contact in the cycle charge and discharge process, and improve the cycle.
Other structures are the same as those in the first embodiment, and are not described again here.
Third embodiment
The difference from the first embodiment is that: the electrically conductive adhesive linkage 3 of this embodiment is the stratiform, electrically conductive adhesive linkage 3 has and connects face 33, it approximately covers whole silicon carbon coating 1 to connect face 33, help increasing the whole adhesion area of electrically conductive adhesive linkage 3, play the effect of fixed silicon carbon coating 1 and graphite coating 2, the area of connecting face 33 is less than silicon carbon coating 1's area slightly, ensure and have enough area of contact between silicon carbon coating 1 or the graphite coating 2, electrically conductive adhesive linkage 3's thickness can be designed for being less than silicon carbon coating 1 or graphite coating 2, avoid influencing the ion transmission between the layer, improve the contact between circulation charge-discharge in-process layer, reach and improve the cyclicity ability.
Other structures are the same as those of the first embodiment, and are not described herein again.
Lithium ion battery
The utility model discloses a pole piece structure for improving lithium cell cycle performance of embodiment one ~ three.
Specifically, the battery cell comprises a battery cell, and the battery cell may comprise at least two pole pieces which are stacked on each other and have opposite polarities, and the pole pieces with opposite polarities form a positive pole piece of the battery and a negative pole piece of the battery respectively. In order to avoid short circuit between the positive pole piece and the negative pole piece, a diaphragm is arranged between every two adjacent pole pieces, and the pole pieces with opposite polarities are electrically isolated through the diaphragms. At least one of the pole pieces may be the pole piece in the above embodiment.
The at least two pole pieces may include a first pole piece and a second pole piece, the polarities of the first pole piece and the second pole piece are opposite, and the first pole piece and the second pole piece are overlapped with each other.
Specifically, the first pole piece may be a positive pole piece, and the second pole piece may be a negative pole piece; alternatively, the first pole piece may be a negative pole piece, and the second pole piece may be a positive pole piece, which is not limited herein.
In some examples, the cells may be wound cells. The first pole piece, the diaphragm and the second pole piece which are sequentially stacked are wound around a winding center to form a winding structure.
In other examples, the cells may be laminated cells. The first pole pieces are multiple, the second pole pieces are multiple, the multiple first pole pieces and the multiple second pole pieces are sequentially arranged in a staggered and stacked mode along the same direction, and a diaphragm is arranged between every two adjacent first pole pieces and every two adjacent second pole pieces, so that the first pole pieces and the second pole pieces are electrically insulated.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art based upon the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, such terms are used for convenience of description and are not to be construed as limiting the invention in any way.
Claims (10)
1. A pole piece structure for improving cycle performance of a lithium battery, comprising:
a current collector;
the silicon-carbon coating (1) is coated on the surface of the current collector;
the graphite coating (2) is coated above the silicon-carbon coating (1);
and the conductive bonding layer (3) is arranged between the silicon-carbon coating (1) and the graphite coating (2).
2. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 1, wherein: the conductive adhesive layer (3) is a mixed solution of acrylic glue and carbon nanotubes.
3. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 1, wherein: the conductive bonding layer (3) is formed between the silicon-carbon coating (1) and the graphite coating (2) through spraying.
4. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 1, wherein: the ratio of the surface density of the graphite coating (2) to the silicon-carbon coating (1) is less than 4.5/5.5.
5. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 1, wherein: the conductive bonding layer (3) is in a lattice shape, a strip shape or a layer shape.
6. The pole piece structure for improving cycle performance of a lithium battery as claimed in claim 5, wherein: the conductive adhesive layer (3) comprises a plurality of connecting points (31), and the plurality of connecting points (31) are uniformly distributed on the surface of the silicon-carbon coating (1).
7. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 5, wherein: the conductive adhesive layer (3) comprises a plurality of connecting bands (32) arranged side by side, and the connecting bands (32) extend along the length direction or the width direction.
8. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 5, wherein: the conductive bonding layer (3) is provided with a connecting surface (33), and the area of the connecting surface (33) is smaller than or equal to that of the silicon-carbon coating (1).
9. The pole piece structure for improving the cycle performance of a lithium battery as claimed in claim 1, wherein: the thickness of the conductive bonding layer (3) is smaller than that of the silicon-carbon coating (1) or the graphite coating (2).
10. A lithium ion battery, characterized by: a pole piece structure for improving cycle performance of a lithium battery comprising any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222208422.0U CN218414631U (en) | 2022-08-22 | 2022-08-22 | Pole piece structure for improving cycle performance of lithium battery and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222208422.0U CN218414631U (en) | 2022-08-22 | 2022-08-22 | Pole piece structure for improving cycle performance of lithium battery and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN218414631U true CN218414631U (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222208422.0U Active CN218414631U (en) | 2022-08-22 | 2022-08-22 | Pole piece structure for improving cycle performance of lithium battery and lithium ion battery |
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| Country | Link |
|---|---|
| CN (1) | CN218414631U (en) |
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2022
- 2022-08-22 CN CN202222208422.0U patent/CN218414631U/en active Active
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