CN109830688A - Cathode current collector and cathode sheet - Google Patents
Cathode current collector and cathode sheet Download PDFInfo
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- CN109830688A CN109830688A CN201910036623.7A CN201910036623A CN109830688A CN 109830688 A CN109830688 A CN 109830688A CN 201910036623 A CN201910036623 A CN 201910036623A CN 109830688 A CN109830688 A CN 109830688A
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- fiber
- metal layer
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- current collector
- cathode current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention proposes a kind of cathode current collector and cathode sheet, wherein cathode current collector, including the first metal layer, fiber braiding layer and second metal layer, the first metal layer, fiber braiding layer and second metal layer stack gradually covering setting.By the way that the first metal layer and second metal layer are plated on fiber braiding layer, obtain composite cathode collector, using fiber braiding layer, reduce cathode collector body weight, the energy density of battery core is improved, collector tensile strength is increased, improves battery core manufacturing process ability, enhancing buffering external carbuncle and the effect for adhering to broken metal, substantially increase the security performance of battery core.
Description
Technical field
The present invention relates to field of lithium ion battery, the cathode current collector and cathode in lithium ion battery are especially related to
Pole piece.
Background technique
Currently, the cathode current collector of most of lithium ion battery is using metal foils such as aluminium foils, though these metal foils
So have preferable electrical conductance and thermal conductance, but by external force squeeze and foreign matter puncture etc. under the conditions ofs, be easy to produce size compared with
Big metal fragment or burr causes battery core that internal short-circuit occurs, brings security risk to pierce through diaphragm.
In order to eliminate safe hidden trouble, people are had studied including safety coatings, a variety of including organic-metallic composite current collector
Safety approach.Safety coatings refer to that anode or isolation film surface coat one layer of insulant, by increasing pole piece in cell cathode
Resistance or isolation film mechanical performance prevent inside battery from generating high current and reduce internal short-circuit area, to improve safety
Energy.However these shallow layers can not stop to puncture, the extreme conditions bring metal fragment such as extruding or burr pierce through diaphragm, lead
It causes anode and cathode to be in contact, to make battery core that internal short-circuit occur, is easy to happen on fire and explosion phenomenon.
Summary of the invention
The main object of the present invention is to provide a kind of cathode current collector and cathode sheet, improves battery core energy density, enhancing
Battery core security performance.
The present invention proposes a kind of cathode current collector, including the first metal layer, fiber braiding layer and second metal layer, the first gold medal
Belong to layer, fiber braiding layer and second metal layer and stacks gradually covering setting.
Further, the composition material of fiber braiding layer includes super-fine fiber material.
Further, super-fine fiber material includes glass fibre, metallic fiber, one of organic fiber or a variety of.
Further, organic fiber includes polyacrylonitrile fibre (PAN fiber), and the double oxazoles (PBO) of polyparaphenylene's benzo are fine
Dimension, polybenzimidazoles (PBI) fiber, polyimide fiber (PI fiber), one of carbon fiber or a variety of.
Further, the first metal layer and the composition material of second metal layer include nickel, titanium, silver, aluminium, in corronil
It is one or more.
Further, there is braiding gap, the size for weaving gap includes 6-10 μm in fiber braiding layer.
Further, the first metal layer and the thickness of second metal layer include 1-10 μm.
Further, the tensile strength of fiber braiding layer is 190N/mm2~260N/mm2。
Further, the thickness of fiber braiding layer includes 5-20 μm.
The invention also provides a kind of cell cathode pole pieces, including any one of above-mentioned cathode current collector and battery
Active material layer, the covering of battery active material layer stackup are arranged in the first metal layer and second metal layer backwards to fiber braiding layer
Face on.
Compared with prior art, the present invention beneficial effect is: the present invention provides a kind of cathode current collector and cathode sheet,
Wherein cathode current collector, including the first metal layer, fiber braiding layer and second metal layer, the first metal layer, fiber braiding layer with
Second metal layer stacks gradually covering setting.By the way that the first metal layer and second metal layer to be plated on fiber braiding layer, obtain
Composite cathode collector is reduced cathode collector body weight, is improved the energy density of battery battery core using fiber braiding layer, is increased
Big collector tensile strength improves battery core manufacturing process ability, enhancing buffering external carbuncle and the broken metal of reduction and metal
The ill-effect of burr size reduces a possibility that internal short-circuit occurs for battery core, substantially increases the security performance of battery core.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of cathode sheet of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly, and the connection, which can be, to be directly connected to,
It can be and be indirectly connected with.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the technical side between each embodiment
Case can be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution
Conflicting or cannot achieve when occur will be understood that the combination of this technical solution is not present, also not the present invention claims guarantor
Within the scope of shield.
Referring to Fig.1, a kind of cathode current collector, including the first metal layer 2, fibrage are proposed in one embodiment of the invention
Layer 1 and second metal layer 3, the first metal layer 2, fiber braiding layer 1 and second metal layer 3 stack gradually covering setting.It is wherein fine
For carrying the first metal layer 2 and second metal layer 3, the first metal layer 2 and second metal layer 3 are uniformly distributed in dimension braiding layer 1
Fibrous layer fiber surface, for carrying battery active material layer 4.
By the way that the first metal layer 2 and second metal layer 3 are plated on fiber braiding layer 1, obtained composite cathode collector,
Mainly there are a three aspect advantages: one, relative to existing pure metal foil cathode current collector, weight can reduce by 20%~40%, show
The energy density for improving battery battery core write.In one embodiment, the material of the first metal layer and second metal layer is aluminium, then
Due to density=2.7g/cm3 of aluminium, the density ≈ 1.6g/cm3 of fiber, is 1cm with volume3Material for calculate: 1cm3
Aluminum foil weights=2.7g；1cm3Fibre weight=1.6g；Assuming that in 1cm3Fiber-aluminum composite foil material (cathode current collector) in, it is fine
The volume of peacekeeping aluminium respectively accounts for half, then 1cm3Weight=2.7/2+1.6/2=2.15g of composite foil, of poor quality=aluminium foil weight
Amount-composite foil weight=2.7-2.15=0.55g, percentage of poor quality are as follows: 0.55/2.7=20%.It can by calculating above
Know: compared with fine aluminium foil, alleviating 20% using the quality of composite foil.And in battery core, it is total that cathode current collector accounts for battery core
Quality about 5%, after composite foil, battery core gross mass reduces 5%*20%=1.0%；Battery core energy density=energy/
Weight, then using after composite material, battery core energy density can promote about 1%.Two, using fiber braiding layer 1 as supporting substrate, yin
Pole collector has better tensile strength and broader tension, to can carry bigger pressure in production to realize active material
Material obtains bigger compacted density, to promote the process capability of manufacture battery core.Three, 3 jail of the first metal layer 2 and second metal layer
Admittedly being attached on fiber braiding layer 1, and metal layer is relatively thin, when being punctured by sharp object or blunt squeezes, since fiber is compiled
There is gap between tissue layer 1, and have the function of buffering external carbuncle and adhere to broken metal, therefore cathode current collector generates
Clast and burr size be far smaller than existing metal foil cathode current collector, reduce diaphragm and be pierced the wind for leading to battery short circuit
Danger, substantially increases the security performance of battery core.
The invention proposes a kind of cathode current collector, including the first metal layer, fiber braiding layer and second metal layer, first
Metal layer, fiber braiding layer and second metal layer stack gradually covering setting.By the way that the first metal layer and second metal layer are plated
On fiber braiding layer, composite cathode collector is obtained, using fiber braiding layer, cathode collector body weight is reduced, improves electricity
The energy density of pond battery core increases collector tensile strength, improves battery core manufacturing process ability, and enhancing buffers external carbuncle and glues
Attached broken metal, the effect for reducing burr, substantially increase the security performance of battery core.
In some embodiments, the production process of cathode current collector is as follows: being uniformly coated with one on fiber braiding layer 1 first
Layer primer, it is sufficiently dry to primer.Fiber cloth reel is put into electron beam evaporation deposition machine vacuum chamber, vacuum chamber is sealed,
It vacuumizes until evaporation device is warming up to 1300 DEG C -1400 DEG C greater than 10-3Pa by vacuum degree, then by aluminum metal feeding evaporation
In mechanism, system tension is controlled, cooling system is opened, accurately controls coiling speed, aluminium speed and evaporation device is sent to heat
Electric current melts metal persistently on evaporation device, evaporation, forms the of uniform thickness on mobile 1 surface of fiber braiding layer
One metal layer 2 and second metal layer 3, obtain cathode current collector.
In some embodiments, the composition material of fiber braiding layer 1 includes super-fine fiber material.Superfine fibre diameter is small,
Light weight, have preferable tensile strength and flexibility, fiber cloth made of being woven as superfine fibre, due to fibre bundle it
Between there are certain braiding gaps, in some embodiments, the size for weaving gap includes 6-10 μm, when by come from sharp object
When the puncture of body, fiber squeezes around, reduces effective damage area of pole piece, reduces metal fillings or burr size, thus
The anode and cathode pole piece contact area for reducing battery core, reduces the probability of happening of internal short-circuit.Moreover, because the first gold medal of cathode current collector
Belong to layer 2 and second metal layer 3 is relatively thin, the volume size of the metal fillings or burr that are generated by external force is accordingly smaller, works as battery core
When being punctured and internal short-circuit occurs, high current is easy to consider to be worth doing these small sized metallics by the heat generated or burr melts
It is disconnected, internal short-circuit is blocked, so that the heat of short circuit current generation is substantially reduced, further, since fiber braiding layer 1 is with preferable strong
Degree, can reduce foreign matter paracentesis depth, to reduce internal short-circuit area, prevents battery core from fire and explosion occurs, improves battery core
Security performance.
In some embodiments, due to the working environment of battery battery core, fiber braiding layer 1 should have preferable resistance to height
Temperature, low temperature resistant, corrosion resistance characteristic, super-fine fiber material include glass fibre, metallic fiber, one of organic fiber or more
Kind.Wherein the good insulating, heat resistance of glass fibre are strong, corrosion resistance is good, high mechanical strength, but wearability is poor.Metal
Fiber have good conductive, thermally conductive, magnetic conduction and high temperature resistance, but be crushed when can also generate metal fragment.Organic fiber
Tensile strength is big, and crushing resistance is strong.Comprehensive multiple fiber constitutes fiber braiding layer 1, and fiber braiding layer 1 is made not only to have good lead
Electric, thermally conductive, corrosion-resistant and high temperature resistance, and there is preferable tensile strength and flexibility.
In some embodiments, organic fiber includes polyacrylonitrile fibre (PAN fiber), the double oxazoles of polyparaphenylene's benzo
(PBO) fiber, polybenzimidazoles (PBI) fiber, polyimide fiber (PI fiber), one of carbon fiber or a variety of.Wherein,
Preferably carbon fiber not only has good conductive, thermally conductive, corrosion-resistant and resistance to height with the fiber braiding layer 1 that carbon fiber forms
Warm nature energy, and there is preferable tensile strength and flexibility.
In some embodiments, the first metal layer 2 and the composition material of second metal layer 3 include nickel, titanium, silver, aluminium, cupro-nickel
One of alloy is a variety of, and the first metal layer 2 and second metal layer 3 can be made to have satisfactory electrical conductivity.
In some embodiments, the first metal layer 2 and second metal layer 3 by vapour deposition process, spray coating method, infusion method,
The combination layer superimposition of one of electrophoresis or a variety of methods is placed on fiber braiding layer 1, makes the first metal layer 2 and the second metal
3 thickness of layer are uniform, and smooth is plated on fiber braiding layer 1.
In some embodiments, the tensile strength of fiber braiding layer 1 is 190N/mm2~260N/mm2, there is good stretch
The fiber braiding layer 1 of performance can firmly adhere to the first metal layer 2 and second metal layer 3, can either guarantee the first metal layer 2
It will not deform or be crushed easily with second metal layer 3, keep good working performance, and in the first metal layer 2 and the second gold medal
After category layer 3 is broken, it is still able to firmly adhere to broken metal fragment, reduction diaphragm is pierced the wind for leading to battery short circuit
Danger, substantially increases the security performance of battery core.
In some embodiments, the thickness of fiber braiding layer 1 includes 5-20 μm, and preferably 8~10 μm, the first metal layer 2
With second metal layer 3 with a thickness of 1-10 μm, preferably 2~5 μm, if the first metal layer 2 and second metal layer 3 are too thin,
It can not effectively be bonded on fiber base material, and as collector, electric conductivity also will receive influence；If the first metal layer 2
It is larger with 3 thickness of second metal layer, on the one hand since the density of the first metal layer 2 and second metal layer 3 is compared with fiber braiding layer 1
Greatly, battery energy density can be lost, on the other hand, when the first metal layer 2 and thicker second metal layer 3, foreign matter, which pierces through, to be generated
Burr is longer, is easy to cause inside battery core and internal short-circuit occurs.
The invention proposes a kind of cathode current collector, including the first metal layer, fiber braiding layer and second metal layer, first
Metal layer, fiber braiding layer and second metal layer stack gradually covering setting.By the way that the first metal layer and second metal layer are plated
On fiber braiding layer, composite cathode collector is obtained, using fiber braiding layer, cathode collector body weight is reduced, improves electricity
The energy density of pond battery core increases collector tensile strength, improves battery core manufacturing process ability, and enhancing buffers external carbuncle and glues
The effect of attached broken metal, substantially increases the security performance of battery core.
The invention also provides a kind of cell cathode pole pieces, and cathode current collector and battery including above-mentioned any one are living
Property material layer, battery active material layer stackup covering the first metal layer and second metal layer are set backwards to fiber braiding layer
On face.In some embodiments, by 96.5% active material of cathode NCM of mass fraction, 1.5% poly- four vinylidene of binder
(PVDF), 1.5% conductive agent super-p and 0.5%CNTS conductive paste is added in solvent N-methyl pyrilidone, sufficiently
It is stirred, obtains uniform sizing material.Gained slurry is evenly coated in the form of roller coating or extrusion coated obtained among the above
Cathode current collector tow sides on, after drying, active material is uniformly distributed on cathode current collector.Roll-in is then passed through,
Cross cutting obtains cathode sheet.The advantage as possessed by above-mentioned cathode current collector is assembled with the battery battery core of the cathode sheet
With regard to energy density with higher and preferable security performance.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of cathode current collector, which is characterized in that including the first metal layer, fiber braiding layer and second metal layer, described
One metal layer, the fiber braiding layer and the second metal layer stack gradually covering setting.
2. cathode current collector according to claim 1, which is characterized in that the composition material of the fiber braiding layer includes super
Fine fiber material.
3. cathode current collector according to claim 2, which is characterized in that the super-fine fiber material includes glass fibre,
Metallic fiber, one of organic fiber or a variety of.
4. cathode current collector according to claim 3, which is characterized in that the organic fiber includes polyacrylonitrile fibre
(PAN fiber), double oxazole (PBO) fibers of polyparaphenylene's benzo, polybenzimidazoles (PBI) fiber, (PI is fine for polyimide fiber
Dimension), one of carbon fiber or a variety of.
5. cathode current collector according to claim 1, which is characterized in that the first metal layer and the second metal layer
Composition material include nickel, one of titanium, silver, aluminium, corronil or a variety of.
6. cathode current collector according to claim 1, which is characterized in that there is braiding gap in the fiber braiding layer,
The size in the braiding gap includes 6-10 μm.
7. cathode current collector according to claim 1, which is characterized in that the first metal layer and the second metal layer
Thickness include 1-10 μm.
8. cathode current collector according to claim 1, which is characterized in that the tensile strength of the fiber braiding layer is
190N/mm2~260N/mm2。
9. cathode current collector according to claim 1, which is characterized in that the thickness of the fiber braiding layer includes 5-20 μ
m。
10. a kind of cell cathode pole piece, which is characterized in that including cathode current collector described in any one of claim 1-9 with
And battery active material layer, the battery active material layer stackup covering are arranged in the first metal layer and second gold medal
Belong to layer on the face of the fiber braiding layer.
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| CN201910036623.7A CN109830688A (en) | 2019-01-15 | 2019-01-15 | Cathode current collector and cathode sheet |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020238156A1 (en) * | 2019-05-31 | 2020-12-03 | 宁德时代新能源科技股份有限公司 | Positive electrode current collector, positive electrode piece, electrochemical device, and device |
| WO2020238155A1 (en) * | 2019-05-31 | 2020-12-03 | 宁德时代新能源科技股份有限公司 | Negative electrode current collector, negative electrode piece, electrochemical device, and device |
| WO2021000562A1 (en) * | 2019-07-01 | 2021-01-07 | 宁德时代新能源科技股份有限公司 | Positive electrode current collector, positive electrode plate, electrochemical apparatus and device thereof |
| CN112510208A (en) * | 2020-11-27 | 2021-03-16 | 浙江南都电源动力股份有限公司 | Folding graphene current collector, preparation method thereof and lithium ion battery |
| WO2023206689A1 (en) * | 2022-04-29 | 2023-11-02 | 扬州纳力新材料科技有限公司 | Current collector and preparation method therefor and use thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020238156A1 (en) * | 2019-05-31 | 2020-12-03 | 宁德时代新能源科技股份有限公司 | Positive electrode current collector, positive electrode piece, electrochemical device, and device |
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| WO2023206689A1 (en) * | 2022-04-29 | 2023-11-02 | 扬州纳力新材料科技有限公司 | Current collector and preparation method therefor and use thereof |
| WO2023208240A1 (en) * | 2022-04-29 | 2023-11-02 | 扬州纳力新材料科技有限公司 | Current collector, and preparation method therefor and application thereof |
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Application publication date: 20190531 |