CN211929613U - Lithium ion battery negative plate with good flexibility and lithium ion battery - Google Patents
Lithium ion battery negative plate with good flexibility and lithium ion battery Download PDFInfo
- Publication number
- CN211929613U CN211929613U CN202020874473.5U CN202020874473U CN211929613U CN 211929613 U CN211929613 U CN 211929613U CN 202020874473 U CN202020874473 U CN 202020874473U CN 211929613 U CN211929613 U CN 211929613U
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- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- conductive adhesive
- adhesive layer
- anisotropic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 51
- 239000012790 adhesive layer Substances 0.000 claims abstract description 71
- 239000010410 layer Substances 0.000 claims abstract description 38
- 239000004593 Epoxy Substances 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000011149 active material Substances 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 23
- 239000011889 copper foil Substances 0.000 claims description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052710 silicon Inorganic materials 0.000 claims description 16
- 239000010703 silicon Substances 0.000 claims description 16
- 239000007773 negative electrode material Substances 0.000 claims description 14
- 239000007770 graphite material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000002931 mesocarbon microbead Substances 0.000 claims description 3
- 229910021382 natural graphite Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- 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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses a lithium ion battery negative pole piece that pliability is good and lithium ion battery who contains this negative pole piece, this negative pole piece include the mass flow body, and the negative and positive face of mass flow body all coats and is equipped with anisotropic epoxy conductive adhesive layer, and anisotropic epoxy conductive adhesive layer's surface coating is equipped with anisotropic organosilicon conductive adhesive layer, and anisotropic organosilicon conductive adhesive layer surface coating is equipped with the negative pole active material layer. The utility model discloses a lithium ion battery negative pole piece that pliability is good and lithium ion battery who contains this negative pole piece have that the pliability is good, the cohesiveness is strong and interface compatibility is good characteristics.
Description
Technical Field
The utility model relates to a lithium ion battery technical field specifically indicates a lithium ion battery negative pole piece that pliability is good and contain lithium ion battery of this negative pole piece.
Background
Lithium ion batteries have been widely used in consumer electronics, electric tools, electric vehicles, and other industries, and have the advantages of high operating voltage, high energy density, long cycle life, high power, environmental friendliness, and the like. As lithium ion batteries become more widely used, they are challenged by higher energy densities.
In the actual production process, the compaction density of the pole piece is directly influenced by the tabletting process, and the tabletting process is a key process for improving the energy density of the lithium ion battery. In order to meet the requirement of high energy density as much as possible, the pressing of the negative electrode plate is taken as an example, the hot pressing mode is generally adopted, and after the hot pressing is finished and the normal temperature is recovered, the situation that the negative electrode active material layer and the current collector fall off from the current collector exists, so that the pole plate is brittle, the wettability of the electrolyte is poor, and the cycle life of the lithium ion battery is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lithium ion battery negative pole piece that pliability is good and contain lithium ion battery of this negative pole piece has that the pliability is good, the cohesiveness is strong and interface compatibility is good characteristics.
The utility model discloses can realize through following technical scheme:
the utility model discloses a lithium ion battery negative pole piece that pliability is good, including the mass flow body, the negative and positive face of mass flow body all coats and is equipped with anisotropic epoxy conductive adhesive layer, and anisotropic epoxy conductive adhesive layer's surface coating is equipped with anisotropic organosilicon conductive adhesive layer, and anisotropic organosilicon conductive adhesive layer surface coating is equipped with the negative pole active material layer.
Furthermore, the anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are conductive adhesive layers conducted in the Z direction, so that an electronic conduction path is effectively shortened, and the conductivity is improved.
Furthermore, the anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are both copper conductive adhesive layers and have the same expansion coefficient with a copper foil current collector, so that the damage of the stress action on the negative electrode interface in the circulation process is reduced, the integrity of the interface is ensured, and the cycle life of the lithium ion battery is prolonged.
Furthermore, the current collector is a copper foil, and the copper foil is a single-sided polished copper foil or a double-sided polished copper foil, and is flexibly selected according to the type of the battery.
Furthermore, the thickness of the copper foil is 4-16 mu m, the copper foil is the thickness of the conventional copper foil of the lithium ion battery, and the processing universality is strong.
Further, the thickness of the anisotropic epoxy conductive adhesive layer is 1-3 μm; the thickness of the anisotropic organosilicon conductive adhesive layer is 1-3 mu m, so that the bonding and conduction effects are effectively improved, and the anisotropic organosilicon conductive adhesive layer also has excellent flexibility.
Furthermore, the negative active material layer is an artificial graphite material layer, a natural graphite material layer, a mesocarbon microbead material layer, a silicon carbon material layer or a lithium titanate material layer, and is flexibly selected by combining with a specific application scene.
Another aspect of the present invention is to protect the lithium ion battery comprising the above lithium ion battery negative electrode sheet with good flexibility.
Further, the lithium ion battery is a cylindrical lithium ion battery, a soft package lithium ion battery or an aluminum shell lithium ion battery.
The utility model relates to a lithium ion battery negative pole piece that pliability is good and contain lithium ion battery of this negative pole piece has following beneficial effect:
the anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are arranged in the current collector and the negative active material layer, the anisotropic organic silicon conductive adhesive layer has the characteristics of high adhesive force and good flexibility, and a certain hardness gradient is formed between the anisotropic organic silicon conductive adhesive layer and the anisotropic epoxy conductive adhesive layer, so that the anisotropic organic silicon conductive adhesive layer has an excellent load buffering effect in a bank on the extrusion stress;
secondly, the adhesive property is strong, the anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are arranged in the current collector and the negative active material layer, the all-purpose adhesive in the anisotropic epoxy conductive adhesive layer named as conductive adhesive has strong adhesive force to various materials, the current collector and the anisotropic organic silicon conductive adhesive layer can be effectively and tightly adhered, and the anisotropic organic silicon conductive adhesive layer is soft, so that inorganic particles of the negative active material layer can effectively and conveniently form a point contact effect of interface embedding, and finally the negative active material layer is tightly adhered on the current collector, is not easy to fall off even in the tabletting process, and has high combination tightness;
and moreover, the negative active material is basically a carbon-based material which is used as a filler commonly used for the conductive adhesive layer, the negative active material can be effectively dispersed in the organic silicon conductive layer, and the anisotropic organic silicon conductive layer and the negative active material layer are well compatible.
Drawings
Fig. 1 is a schematic structural diagram of a lithium ion battery negative plate with good flexibility according to the present invention;
the reference numbers in the drawings include: 100. a current collector; 201. an epoxy conductive adhesive layer; 202. An organic silicon conductive adhesive layer; 300. and a negative electrode active material layer.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following provides a detailed description of the product of the present invention with reference to the embodiments and the accompanying drawings.
Example 1
As shown in fig. 1, the utility model discloses a lithium ion battery negative plate that pliability is good, including the mass flow body 100, the sunny and shady face of the mass flow body all coats and is equipped with anisotropic epoxy conductive adhesive layer 201, and the surface coating of anisotropic epoxy conductive adhesive layer 201 is equipped with anisotropic organosilicon conductive adhesive layer 202, and anisotropic organosilicon conductive adhesive layer 202 surface coating is equipped with negative active material layer 300.
In this embodiment, the anisotropic epoxy conductive adhesive layer and the anisotropic silicone conductive adhesive layer are both conductive adhesive layers conducting in the Z direction. The anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are both copper conductive adhesive layers. The thickness of the anisotropic epoxy conductive adhesive layer is 1-3 mu m; the thickness of the anisotropic organosilicon conductive adhesive layer is 1-3 μm.
In this embodiment, the current collector is a copper foil, and the copper foil is a single-sided polished copper foil or a double-sided polished copper foil; the thickness of the copper foil is 4 to 16 μm.
Example 2
As shown in fig. 1, the utility model discloses a lithium ion battery negative plate that pliability is good, including the mass flow body 100, the sunny and shady face of the mass flow body all coats and is equipped with anisotropic epoxy conductive adhesive layer 201, and the surface coating of anisotropic epoxy conductive adhesive layer 201 is equipped with anisotropic organosilicon conductive adhesive layer 202, and anisotropic organosilicon conductive adhesive layer 202 surface coating is equipped with negative active material layer 300.
In this embodiment, the anisotropic epoxy conductive adhesive layer and the anisotropic silicone conductive adhesive layer are both conductive adhesive layers conducting in the Z direction. The anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are both copper conductive adhesive layers. The thickness of the anisotropic epoxy conductive adhesive layer is 1-3 mu m; the thickness of the anisotropic organosilicon conductive adhesive layer is 1-3 μm.
In this embodiment, the negative active material layer is an artificial graphite material layer, a natural graphite material layer, a mesocarbon microbead material layer, a silicon carbon material layer, or a lithium titanate material layer.
Example 3
Another aspect of the present invention is to protect the lithium ion battery comprising the above lithium ion battery negative electrode sheet with good flexibility.
Specifically, the lithium ion battery is a cylindrical lithium ion battery, a soft package lithium ion battery or an aluminum shell lithium ion battery.
Example 4
In order to verify the technical effect of the utility model, regard as anodal mass flow body with the two-sided light copper foil of 6 mu m, respectively coating design thickness is 2 mu m's anisotropic epoxy conducting resin layer upon layer, 2 mu m's anisotropic organosilicon conducting resin layer, negative pole active material layer are the anodal pole piece on artificial graphite material layer, and the while preparation does not have the negative pole piece on coating conducting resin layer to contrast, and process design thickness is 1.58g/cm3And other process parameters are consistent. Through the contrast discovery, the coating has the utility model discloses crisp rate is only 1.5% behind conductive adhesive layer's the pole piece excessive pressure, and the crisp rate is 23% (the judgement of specific crisp is fifty percent discount behind the preforming, then observes whether the crease is printing opacity, if the printing opacity judgement is the crisp) behind conductive adhesive layer's the pole piece excessive pressure. Meanwhile, electrolyte wettability measurement is carried out on the two pole pieces, the washing liquid amount of the negative pole piece coated with the conductive adhesive layer is increased by 13% relative to the washing liquid amount without the conductive adhesive layer, and the cycle number of charge and discharge is averagely prolonged by 19.3%.
In the description of the present invention, it is to be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" 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" or "second" 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 specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. 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 above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, many variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.
Claims (9)
1. The utility model provides a lithium ion battery negative pole piece that pliability is good, includes the mass flow body, its characterized in that: the negative and positive face of mass flow body all coats and is equipped with anisotropic epoxy conductive adhesive layer, anisotropic epoxy conductive adhesive layer's surface coating is equipped with anisotropic organosilicon conductive adhesive layer, anisotropic organosilicon conductive adhesive layer surface coating is equipped with the negative pole active material layer.
2. The lithium ion battery negative electrode sheet with good flexibility according to claim 1, characterized in that: the anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are conductive adhesive layers conducted in the Z direction.
3. The lithium ion battery negative electrode sheet with good flexibility according to claim 2, characterized in that: the anisotropic epoxy conductive adhesive layer and the anisotropic organic silicon conductive adhesive layer are copper conductive adhesive layers.
4. The lithium ion battery negative electrode sheet with good flexibility according to claim 3, characterized in that: the current collector is a copper foil, and the copper foil is a single-sided smooth copper foil or a double-sided smooth copper foil.
5. The lithium ion battery negative electrode sheet with good flexibility according to claim 4, wherein: the thickness of the copper foil is 4-16 mu m.
6. The lithium ion battery negative electrode sheet with good flexibility according to claim 5, characterized in that: the thickness of the anisotropic epoxy conductive adhesive layer is 1-3 mu m; the thickness of the anisotropic organosilicon conductive adhesive layer is 1-3 μm.
7. The lithium ion battery negative electrode sheet with good flexibility according to claim 6, wherein: the negative active material layer is an artificial graphite material layer, a natural graphite material layer, a mesocarbon microbead material layer, a silicon carbon material layer or a lithium titanate material layer.
8. A lithium ion battery comprising the lithium ion battery negative electrode sheet with good flexibility as claimed in claims 1-7.
9. The lithium ion battery of claim 8, wherein: the lithium ion battery is a cylindrical lithium ion battery, a soft package lithium ion battery or an aluminum shell lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020874473.5U CN211929613U (en) | 2020-05-22 | 2020-05-22 | Lithium ion battery negative plate with good flexibility and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020874473.5U CN211929613U (en) | 2020-05-22 | 2020-05-22 | Lithium ion battery negative plate with good flexibility and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211929613U true CN211929613U (en) | 2020-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020874473.5U Expired - Fee Related CN211929613U (en) | 2020-05-22 | 2020-05-22 | Lithium ion battery negative plate with good flexibility and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211929613U (en) |
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2020
- 2020-05-22 CN CN202020874473.5U patent/CN211929613U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |