CN104577136A - Battery current collector with three-dimensional structure and preparation method thereof - Google Patents
Battery current collector with three-dimensional structure and preparation method thereof Download PDFInfo
- Publication number
- CN104577136A CN104577136A CN201410806499.5A CN201410806499A CN104577136A CN 104577136 A CN104577136 A CN 104577136A CN 201410806499 A CN201410806499 A CN 201410806499A CN 104577136 A CN104577136 A CN 104577136A
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- CN
- China
- Prior art keywords
- current collector
- battery current
- dimensional structure
- electrode material
- preparation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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 discloses a battery current collector with a three-dimensional structure and a preparation method thereof. According to the battery current collector disclosed by the invention, a conductor with a three-dimensional meshed structure serves as a matrix, a channel connected to the surface is formed inside the matrix, and pores are formed in the surface; and a three-dimensional meshed hole of the matrix is filled with an electrode material. The preparation method comprises the following steps: preparing the electrode material into a solution, dripping the solution into a massive conductor with the three-dimensional meshed structure, applying pressure to press the massive conductor into a sheet, and encapsulating the electrode material in the three-dimensional meshed structure, thereby obtaining the battery current collector with the three-dimensional structure. The source of the used materials is wide, the preparation process is simple, and the cost is low; and moreover, the electrode material is not limited on the surface of the current collector but the interior of the current collector, the irreversible loss of the electrode material in the charge and discharge process can be reduced, the electrochemical performance of the electrode is stabilized, and the cycle service life of the electrode is prolonged.
Description
Technical field
The invention belongs to battery applications technical field, relate to a kind of battery current collector with three-dimensional structure and preparation method thereof.
Background technology
The development in the field such as electric automobile, portable electrical appliance proposes very high requirement for energy storage device, and battery, particularly lithium ion battery are because energy density is large, dynamic characteristics is good etc., and advantage is widely used.Battery is generally made up of positive and negative two electrodes, barrier film and electrolyte.
Traditional electrode is fixed on current collector by binding agents such as electrode material macromolecules, and current collector is generally tinsel, such as Copper Foil.But this structure is easy to be destroyed in repeated charge process, causes electrode material and current collector to lose connection in electricity, cause battery capacity to decline, electrochemistry performance is unstable.Particularly for the alloy type such as silicon, tin electrode in lithium ion battery, owing to can there is violent change in volume when there is electrochemical reaction, traditional electrode structure is difficult to keep stable especially.
Summary of the invention
The object of the invention is to, overcome the deficiency of above-mentioned traditional current collector, a kind of battery current collector with three-dimensional structure and preparation method thereof is provided.Electrode material is encapsulated in the tridimensional network of conductor by the present invention, obtains the battery current collector with three-dimensional structure, effectively can improve the structure of electrode and the stability of electrochemical properties, and preparation technology is simple, with low cost.
To achieve these goals, the technical solution used in the present invention is:
Have a battery current collector for three-dimensional structure, described current collector is to have the conductor of tridimensional network for matrix, and intrinsic silicon has the passage being attached to surface, and there is micropore on surface; Electrode material is filled in the three-dimensional mesh of matrix.
Further, the conductor described in tridimensional network is foam metal.
Further, described foam metal is Cu, Ni, NiCrFe, ZnCu, NiCu, NiCrW or NiFe.
The above-mentioned preparation method with the battery current collector of three-dimensional structure, comprises the following steps:
(1) conductor with tridimensional network is cut into bulk;
(2) will be added drop-wise in above-mentioned block conductor after electrode material dissolves, then evaporating solvent;
(3) above-mentioned block conductor is pressed into flake;
(4) wash away the electrode material of sheet surface with ultrasonic cleaning, dry, obtain the battery current collector of three-dimensional structure.
Alternatively, the solvent that in step (2), lysis electrodes material is used is ethanol.
Alternatively, adopt the mode of roll extrusion that foam metal is pressed into flake in step (3).
Beneficial effect of the present invention:
The present invention uses material source extensive, and preparation technology is simple, with low cost; Electrode material is limited in current collector inner but not surperficial, can reduces the irreversible loss of electrode material in charge and discharge process, the electrochemistry performance of stabilized electrodes, improves the service life cycle of electrode; Preparation process avoids the use of macromolecular material, reduces pollution on the environment.
Accompanying drawing explanation
Fig. 1 is the electron scanning micrograph of embodiment 1 foam metal copper.
Fig. 2 is the cyclic curve of silicon electrode under full discharge and recharge condition made with the three-dimensional current collector of embodiment 1 preparation and traditional current collector, and test condition is to lithium current potential 0-1V, electric current 0.4A/g, room temperature.
Fig. 3 is the cyclic curve of silicon electrode under the constant volume discharge and recharge condition of 1000mAh/g that the three-dimensional current collector prepared with embodiment 2 is made, and test condition is to lithium current potential 0-1V, electric current 0.35A/g, room temperature.
Fig. 4 is the surface Scanning Electron microphotograph of three-dimensional current collector prepared by embodiment 1.
Fig. 5 is the cross sectional scanning electron microphotograph of three-dimensional current collector prepared by embodiment 1.
Embodiment
Be specifically described the present invention below in conjunction with embodiment, what be necessary to herein means out is that following examples are only used to further illustrate the present invention, and can not be interpreted as limiting the scope of the invention.Some nonessential improvement and adjustment that the person skilled in the art in this field does the present invention according to the invention described above content, all can not depart from protection category of the present invention.
Embodiment 1
Foam copper current collector for silicium cathode in lithium ion battery:
Be that the silicon grain of 5 μm is dissolved in ethanol by particle diameter, obtain the solution of concentration 10g/L, this solution being added drop-wise to aperture is in the foam metal copper of hundreds of micron, evaporates ethanol in an oven and obtains dry, the inner foam copper containing silicon grain; Adopt the mode of roll extrusion that block foam copper is pressed into flake; Be placed on the silicon grain that ultrasonic cleaning in ethanolic solution washes away surface attachment, dry in an oven, obtain the foam copper current collector that can be used for silicium cathode in lithium ion battery.
Above-mentioned foam copper current collector and traditional current collector assembled battery is used respectively in the glove box of ar gas environment, silicon electrode is as work electrode, lithium metal is as to electrode, and electrolyte contains ethylene carbonate (EC)/diethyl carbonate (DEC)/fluorinated ethylene carbonate (FEC).Electrochemical property test is carried out to the battery be assembled into, cyclic curve is shown in Fig. 2, as seen from the figure, the battery performance of three-dimensional current collector is used to stablize, circulate 400 times under full discharge and recharge condition, still remain the capacity of nearly 1000mAh/g, and have very high coulombic efficiency, Initial Coulombic Efficiencies is greater than 80%; And using the battery that traditional current collector is assembled, capacity attenuation is exceedingly fast, and less than 50 circulations, capacity is just lower than 100mAh/g, and this illustrates that three-dimensional current collector is keeping serving key effect in the circulation of the electrochemical stability of battery.
As seen from Figure 1, foam metal copper has tridimensional network, and there is the passage being attached to surface its inside, and surface has a large amount of micropore to exist; From Fig. 4 current collector surface scan electromicroscopic photograph, current collector surfacing, has many micropores that is irregular, that lead to current collector inside to exist; From Fig. 5 current collector cross-sectional scans electromicroscopic photograph, current collector inside containing a large amount of silicon electrode material, and is evenly distributed in three-dimensional mesh.
Embodiment 2
Nickel foam current collector for silicium cathode in lithium ion battery:
Be that the silicon grain of 5 μm is dissolved in ethanol by particle diameter, obtain the solution of concentration 10g/L, this solution being added drop-wise to aperture is in the foam metal nickel of hundreds of micron, evaporates ethanol in an oven and obtains dry, the inner nickel foam containing silicon grain; Adopt the mode of roll extrusion that block foam nickel is pressed into flake; Be placed on the silicon grain that ultrasonic cleaning in ethanolic solution washes away surface attachment, dry in an oven, obtain the nickel foam current collector that can be used for silicium cathode in lithium ion battery.
The assembled battery of above-mentioned nickel foam current collector is used in the glove box of ar gas environment, silicon electrode is as work electrode, lithium metal is as to electrode, and electrolyte contains ethylene carbonate (EC)/diethyl carbonate (DEC)/fluorinated ethylene carbonate (FEC).Electrochemical property test is carried out to the battery be assembled into, cyclic curve is shown in Fig. 3, as seen from the figure, in the constant volume discharge and recharge condition test of 1000mAh/g, this electrode can stable circulation 200 times and do not have obvious capacity attenuation, compared to the electrode that traditional current collector is formed, cycle performance increases significantly.
Claims (6)
1. have a battery current collector for three-dimensional structure, it is characterized in that, described current collector is to have the conductor of tridimensional network for matrix, and intrinsic silicon has the passage being attached to surface, and there is micropore on surface; Electrode material is filled in the three-dimensional mesh of matrix.
2. the battery current collector with three-dimensional structure according to claim 1, is characterized in that, described in there is tridimensional network conductor be foam metal.
3. the battery current collector with three-dimensional structure according to claim 2, is characterized in that, described foam metal is Cu, Ni, NiCrFe, ZnCu, NiCu, NiCrW or NiFe.
4. there is described in claim 1-3 the preparation method of the battery current collector of three-dimensional structure, it is characterized in that, comprise the following steps:
(1) conductor with tridimensional network is cut into bulk;
(2) will be added drop-wise in above-mentioned block conductor after electrode material dissolves, then evaporating solvent;
(3) above-mentioned block conductor is pressed into flake;
(4) wash away the electrode material of sheet surface with ultrasonic cleaning, dry, obtain the battery current collector of three-dimensional structure.
5. the preparation method with the battery current collector of three-dimensional structure according to claim 4, is characterized in that, the solvent that in step (2), lysis electrodes material is used is ethanol.
6. the preparation method with the battery current collector of three-dimensional structure according to claim 4, is characterized in that, adopts the mode of roll extrusion that foam metal is pressed into flake in step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410806499.5A CN104577136A (en) | 2014-12-22 | 2014-12-22 | Battery current collector with three-dimensional structure and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410806499.5A CN104577136A (en) | 2014-12-22 | 2014-12-22 | Battery current collector with three-dimensional structure and preparation method thereof |
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| CN104577136A true CN104577136A (en) | 2015-04-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450196A (en) * | 2016-10-10 | 2017-02-22 | 同济大学 | Silicon-based material for lithium-ion battery anodes and preparation method of silicon-based material |
| CN110534702A (en) * | 2018-05-26 | 2019-12-03 | 深圳格林德能源有限公司 | A kind of lithium ion battery silicon negative electrode tab |
| CN114175300A (en) * | 2019-05-27 | 2022-03-11 | 阿迪奥尼克斯以色列有限公司 | Electrochemically generated three-dimensional structures for battery electrodes |
-
2014
- 2014-12-22 CN CN201410806499.5A patent/CN104577136A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106450196A (en) * | 2016-10-10 | 2017-02-22 | 同济大学 | Silicon-based material for lithium-ion battery anodes and preparation method of silicon-based material |
| CN106450196B (en) * | 2016-10-10 | 2019-07-05 | 同济大学 | A kind of silica-base material and preparation method thereof for negative electrode of lithium ion battery |
| CN110534702A (en) * | 2018-05-26 | 2019-12-03 | 深圳格林德能源有限公司 | A kind of lithium ion battery silicon negative electrode tab |
| CN114175300A (en) * | 2019-05-27 | 2022-03-11 | 阿迪奥尼克斯以色列有限公司 | Electrochemically generated three-dimensional structures for battery electrodes |
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