CN109728254A - A kind of technology of preparing of negative electrode of lithium ion battery porous copper foil - Google Patents
A kind of technology of preparing of negative electrode of lithium ion battery porous copper foil Download PDFInfo
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- CN109728254A CN109728254A CN201811468960.5A CN201811468960A CN109728254A CN 109728254 A CN109728254 A CN 109728254A CN 201811468960 A CN201811468960 A CN 201811468960A CN 109728254 A CN109728254 A CN 109728254A
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- copper foil
- cathode roller
- titanium cathode
- porous
- insulation film
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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
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Abstract
The invention discloses a kind of technologies of preparing of negative electrode of lithium ion battery porous copper foil, porous structure is obtained on copper foil using chemical corrosion method, step includes: that several holes through film thickness are formed on polymer insulation film, film with holes is wrapped on a titanium cathode roller surface, titanium cathode roller is immersed in electrolytic bath；Copper foil is bypassed into above-mentioned titanium cathode roller surface, titanium cathode roller rotation moves copper foil continuously, while applying a pulse voltage between copper foil and titanium cathode roller, and copper foil is anode, and titanium cathode roller is cathode；Under electrolyte effect, copper foil shelf depreciation is dissolved positioned at the copper foil of insulation film hole corresponding position, is formed on copper foil and is distributed with the consistent hole of insulation film porous structure；Later after deionized water cleaning, porous copper foil is obtained.
Description
Technical field
The present invention relates to porous copper foil manufacturings, and in particular to a kind of preparation of negative electrode of lithium ion battery porous copper foil
Technology.
Background technique
With the economic rapid advancement with science and technology, the energy crisis that the mankind are faced is also increasingly serious.Such
Under background, the extensive concern of personages of various circles of society is received to the exploitation and research of new energy.Lithium ion battery is as a kind of new
Type energy storage material, compared to having by batteries such as conventional lead acid, ni-mhs, battery energy density is big, average output voltage is high, without note
The multinomial advantages such as the property recalled, efficiency for charge-discharge are high, cycle performance is superior, are widely used in the days such as digital product, new-energy automobile
Normal sphere of life, has a extensive future.Benefit from the continuous development of new-energy automobile Yu 3C industry, 2017, Chinese lithium ion battery
Yield for the first time more than 10,000,000,000, up to 100.73 hundred million, increase by 27.81% on a year-on-year basis, yield ranks the first in the world.
While lithium ion battery manufacturing industry obtains substantive leap, the performance of lithium ion battery also receives scientific research people
The concern of member, negative electrode of lithium ion battery high-performance copper foil just includes wherein.In lithium ion battery, copper foil mainly has two your writings
With: first is that the carrier of active material, i.e., uniformly coat active material graphite on copper foil, bonding forms battery under pressure
Cathode；Second is that the gatherer of cathode electronics and conduction person, i.e., collected electronics by copper foil surface.It is basic based on this two o'clock
It is required that porous copper foil comes into being --- biggish surface area can both promote the adhesion strength of negative electrode active material and copper foil,
The efficiency that cathode collects electronics can be increased；Meanwhile it is porous also reduce the quality of copper foil, conducive to the small-sized of lithium ion battery
Change.
At this stage, the method for preparing negative electrode of lithium ion battery high-performance porous copper foil mainly includes mechanical means and chemistry
Method two major classes, mechanical means mainly have mechanical punching and two kinds of laser method, the former burr is more, the latter's then higher cost；Change
Method is more, but totally apparently, efficiency is lower and flexibility ratio is inadequate.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention is quasi- provides a kind of negative electrode of lithium ion battery porous copper foil
Technology of preparing.Present invention process is simple, and cost is relatively low, and burr is few, conducive to the promotion of production efficiency.
The technical scheme adopted by the invention is that: a kind of technology of preparing of negative electrode of lithium ion battery porous copper foil, with copper
Foil is raw material, using the method for electrochemical corrosion, the specific steps are as follows:
1. forming several holes through film thickness on 50 microns ~ 1 millimeter of thickness of polymer insulation film, make the insulation
Film has porous structure.More emptying aperture structures are formed on film to be not limited to using Mechanical Method, chemical corrosion method etc.；Specific ratio
The porous structure of setting diameter and spacing is such as gone out using mechanical punch pattern.
2. wrapping polymer insulation film with holes on a titanium cathode roller surface, which is connected with whirler
Structure can carry out continuous rotation, which is immersed in electrolytic bath.
3. copper foil is bypassed the above-mentioned titanium cathode roller surface for being wrapped with film, copper foil is made to be covered on film surface, while copper foil
Coil handling apparatus and wrap-up are connected, to achieve the purpose that continuously to prepare the porous copper foil.
4. starting coil handling apparatus and wrap-up and titanium cathode roller rotating mechanism move copper foil continuously, at the same copper foil with
Apply a pulse voltage between titanium cathode roller, copper foil is anode, and titanium cathode roller is cathode.
5. copper foil continuously bypasses titanium cathode roller surface, since the titanium cathode roller of rotation submerges in the electrolytic solution, electrolyte
Into film hole and copper foil localized contact, at this moment stop rotating titanium cathode roller, and copper foil is allowed to stay for some time in the electrolytic solution；
Pulse voltage acts between copper foil and titanium cathode roller simultaneously, and under electrolyte effect, copper foil shelf depreciation is located at and membrane pores
The copper foil of hole corresponding position dissolves, and is formed on copper foil and is distributed one by one with the consistent hole of film porous structure；Pass through later
After deionized water cleaning, porous copper foil is obtained.
Further, the 2 ~ 5V of pulse voltage amplitude applied in step 4,1 ~ 10s of burst length, 10 ~ 50s of interval time；
And titanium cathode roller stops rotating in step 5, is immersed in copper foil duration 1 ~ 10 minute of electrolyte.
Present invention utilizes minute corrosive cell principles, and copper foil is made locally to be corroded, and pass through the electrolysis inside polymer insulation fenestra
Liquid makes copper foil and titanium cathode roller forms minute corrosive cell, and realizes electrolytic etching using pulse voltage.
Copper foil aperture of the invention and spacing can be regulated and controled by the pore structure of used polymer insulating film.This
Invention uses electrochemical erosion method, and product burr is few.And the present invention can be continuously run, production efficiency is obviously improved.
Detailed description of the invention
Fig. 1 is the porous copper foil preparation flow and equipment therefor schematic diagram of various embodiments of the present invention.
Fig. 2 has porous thin polymer film by what mechanical punch pattern prepared for various embodiments of the present invention.
Fig. 3 is the titanium cathode roller for being covered with thin polymer film, when the position for being connected with copper foil submerges in the electrolytic solution, diameter
To schematic cross-section, the hole on thin polymer film of the electrolyte by being covered on titanium cathode roller surface locally connects with copper foil at this time
Touching.
Wherein 1 is the titanium cathode roller in the assembly line for produce electrolytic copper foil, and 2 be copper foil, and 3 is send rolling wheel, and 4 is with holes to be covered with
The titanium cathode roller of thin polymer film, 5 be cupric electrolysis liquid bath, and 6 be de-ionized water tank, and 7 be winding wheel, and 8 be slewing rollers B, and 9 be to turn
To roller A, 10 be thin polymer film, and 11 be the through-hole on thin polymer film, and 12 be copper electrolyte.
Specific embodiment
The present invention is further illustrated below in conjunction with drawings and the specific embodiments.
It is electrolytic copper foil for preparing the copper foil of porous copper foil in following embodiments of the present invention.And below the present invention
It is the system that the electrolytic copper foil come out from electrolysis installation is connected to porous copper foil when preparing porous copper foil in each embodiment
On standby device, so that the preparation of electrolytic copper foil and the formation of porous copper foil of the present invention are carried out continuously on production line, production efficiency is aobvious
It writes and is promoted.
The preparation flow and equipment therefor schematic diagram of each embodiment are as shown in Fig. 1, for preparing the device of porous copper foil
Including send rolling wheel, titanium cathode roller, cupric electrolysis liquid bath, slewing rollers A and slewing rollers B, de-ionized water tank, winding wheel and to
Titanium cathode roller and copper foil both ends apply the power supply of pulse voltage, and wherein titanium cathode roller is placed in cupric electrolysis liquid bath, slewing rollers B is set
In de-ionized water tank.
The concrete operations process that various embodiments of the present invention prepare porous electrolytic copper foil is as described below.
1) it gets out a kind of 50 microns ~ 1 millimeter of thickness of polymer insulation film first, following embodiments is using insulation
Thin polymer film: using mechanical punch pattern, the porous structure of setting diameter and spacing is gone out on thin polymer film, if being formed
The dry hole through film thickness, this has the thin polymer film of porous structure as shown in attached drawing 2.2) by this with porous knot
The thin polymer film of structure overlays on the titanium cathode roller surface for preparing porous copper foil device；3) as shown in Fig. 1, by electrolytic copper foil from life
It produces on the titanium cathode roller in the assembly line of electrolytic copper foil after output, be connected to that the present invention prepares porous copper foil device send rolling wheel
On, it is then consecutively connected to surface and is covered with the titanium cathode roller of thin polymer film, slewing rollers A and slewing rollers B, is connected to winding later
Wheel；4) copper electrolyte is filled in cupric electrolysis liquid bath, de-ionized water tank fills deionized water, make to be covered with the titanium yin of thin polymer film
The position that the position for being connected with copper foil in the roller of pole is immersed in copper electrolyte, is connected with copper foil in slewing rollers B is immersed in deionization
In water；5) rotation send rolling wheel and winding wheel and titanium cathode roller to move electrolytic copper foil continuously, power supply is opened simultaneously, in electrolytic copper foil
With prepare porous copper foil device titanium cathode roller between apply a pulse voltage, copper foil be anode, titanium cathode roller is cathode；6)
Since titanium cathode roller is connected with the position submergence of copper foil in the electrolytic solution, electrolyte is by being covered on the polymerization on titanium cathode roller surface
Hole and copper foil localized contact (as shown in Fig. 3) on object film, at this moment pulse voltage acts on copper foil and the titanium cathode roller
Between, under electrolyte effect, copper foil shelf depreciation dissolves, the shape on copper foil positioned at the copper foil of film hole corresponding position
At being distributed one by one with the consistent hole of film porous structure；It send later by slewing rollers A to slewing rollers B, by deionized water
It in slot after deionized water cleaning, is wound by winding wheel, obtains porous copper foil.
Embodiment 1
Using mechanical punch pattern, 100 microns of diameter and spacing 500 are gone out on the thin polymer film of 50 microns of insulation of thickness
The through-hole structure of the square arrangement of micron, which is overlayed on and prepares porous copper foil device
Titanium cathode roller surface, electrolytic copper foil is connected to and is sent on rolling wheel, is then consecutively connected to the titanium yin that surface is covered with thin polymer film
Pole roller, slewing rollers A and slewing rollers B, it is connected to winding wheel later, copper electrolyte, de-ionized water tank is filled in cupric electrolysis liquid bath
Fill deionized water, make to be covered be connected in the titanium cathode roller of thin polymer film copper foil position be immersed in copper electrolyte, turn
The position that copper foil is connected with into roller B is immersed in deionized water；Rotation send rolling wheel and winding wheel and titanium cathode roller to make cathode copper
Foil continuously moves, and opens simultaneously power supply, in electrolytic copper foil and prepares and applies a width between the titanium cathode roller of porous copper foil device
Value 2V, burst length 1s, the pulse voltage of interval time 10s, copper foil are anode, and titanium cathode roller is cathode；Copper foil is immersed in electricity
The duration for solving liquid is 10 minutes.Since the position that titanium cathode roller is connected with copper foil submerges in the electrolytic solution, electrolyte passes through
Be covered on hole on the thin polymer film on titanium cathode roller surface and copper foil localized contact, at this moment pulse voltage act on copper foil with
Between the titanium cathode roller, under electrolyte effect, copper foil shelf depreciation is dissolved positioned at the copper foil of film hole corresponding position,
It is formed on copper foil and is distributed one by one with the consistent hole of film porous structure；It send later by slewing rollers A to slewing rollers B, warp
It crosses in de-ionized water tank after deionized water cleaning, is wound by winding wheel, obtain porous copper foil.Using sem test copper foil
Aperture is 98.2+/- 2.1 microns and 503.6+/- 5.8 microns of spacing.
Embodiment 2
Using mechanical punch pattern, 500 microns of diameter is gone out on 1 millimeter of thickness of insulating polymer film and spacing 1000 is micro-
The through-hole structure of the equilateral triangle arrangement of rice, which is overlayed on and prepares porous copper foil device
Titanium cathode roller surface, electrolytic copper foil is connected to and is sent on rolling wheel, is then consecutively connected to the titanium yin that surface is covered with thin polymer film
Pole roller, slewing rollers A and slewing rollers B, it is connected to winding wheel later, copper electrolyte, de-ionized water tank is filled in cupric electrolysis liquid bath
Fill deionized water, make to be covered be connected in the titanium cathode roller of thin polymer film copper foil position be immersed in copper electrolyte, turn
The position that copper foil is connected with into roller B is immersed in deionized water；Rotation send rolling wheel and winding wheel and titanium cathode roller to make cathode copper
Foil continuously moves, and opens simultaneously power supply, in electrolytic copper foil and prepares and applies a width between the titanium cathode roller of porous copper foil device
Value 5V, burst length 10s, the pulse voltage of interval time 50s, copper foil are anode, and titanium cathode roller is cathode；Copper foil is immersed in electricity
The duration for solving liquid is 1 minute.Since the position that titanium cathode roller is connected with copper foil submerges in the electrolytic solution, electrolyte is by covering
Hole and copper foil localized contact on the thin polymer film on titanium cathode roller surface are covered, at this moment pulse voltage acts on copper foil and is somebody's turn to do
Between titanium cathode roller, under electrolyte effect, copper foil shelf depreciation is dissolved positioned at the copper foil of film hole corresponding position,
It is formed on copper foil and is distributed one by one with the consistent hole of film porous structure；It send by slewing rollers A to slewing rollers B, passes through later
It in de-ionized water tank after deionized water cleaning, is wound by winding wheel, obtains porous copper foil.Using sem test copper foil hole
Diameter is 519.1+/- 10.1 microns and 1021.6+/- 9.2 microns of spacing.
Claims (4)
1. a kind of technology of preparing of negative electrode of lithium ion battery porous copper foil, which is characterized in that using chemical corrosion method in copper foil
Upper acquisition porous structure, comprising the following steps:
Step 1: forming several holes through film thickness on polymer insulation film, has the insulation film porous
Structure；
Step 2: polymer insulation film with holes is wrapped on a titanium cathode roller surface, which is connected with rotation
Mechanism can carry out continuous rotation, which is immersed in electrolytic bath；
Step 3: copper foil is bypassed into the above-mentioned titanium cathode roller surface for being wrapped with film, copper foil is made to be covered on film surface, while copper foil
Coil handling apparatus and wrap-up are connected, to achieve the purpose that continuously to prepare the porous copper foil；
Step 4: starting coil handling apparatus and wrap-up and titanium cathode roller rotating mechanism move copper foil continuously, while in copper foil
Apply a pulse voltage between titanium cathode roller, copper foil is anode, and titanium cathode roller is cathode；
Step 5: when copper foil continuously bypasses titanium cathode roller surface, since the titanium cathode roller of rotation submerges in the electrolytic solution, electrolyte
Into the hole and copper foil localized contact of the insulation film, at this moment stop rotating titanium cathode roller, and copper foil is allowed to stop in the electrolytic solution
Stay a period of time；Pulse voltage acts between copper foil and titanium cathode roller simultaneously, under electrolyte effect, copper foil shelf depreciation,
It dissolves positioned at the copper foil of insulation film hole corresponding position, is formed and the consistent hole of insulation film porous structure on copper foil
Distribution；Later after deionized water cleaning, porous copper foil is obtained.
2. a kind of technology of preparing of negative electrode of lithium ion battery porous copper foil according to claim 1, it is characterised in that: institute
State 50 microns ~ 1 millimeter of polymer insulation film thickness.
3. a kind of technology of preparing of negative electrode of lithium ion battery porous copper foil according to claim 1, it is characterised in that: institute
Stating step 1 is to go out the porous structure of setting diameter and spacing on polymer insulation film using mechanical punch pattern.
4. a kind of technology of preparing of negative electrode of lithium ion battery porous copper foil according to claim 1, it is characterised in that: step
2 ~ the 5V of pulse voltage amplitude applied in rapid four, 1 ~ 10s of burst length, 10 ~ 50s of interval time；And titanium cathode roller in step 5
It stops rotating, be immersed in copper foil duration 1 ~ 10 minute of electrolyte.
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| CN201811468960.5A CN109728254B (en) | 2018-12-03 | 2018-12-03 | Preparation technology of porous copper foil for lithium ion battery cathode |
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| CN201811468960.5A CN109728254B (en) | 2018-12-03 | 2018-12-03 | Preparation technology of porous copper foil for lithium ion battery cathode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983422A (en) * | 2019-12-30 | 2020-04-10 | 中国科学院青海盐湖研究所 | Method for preparing porous copper foil by square wave electrochemical etching |
| WO2021248848A1 (en) * | 2020-06-12 | 2021-12-16 | 九江德福科技股份有限公司 | Method for manufacturing perforated copper coil for shielded cathode plate |
| CN114686961A (en) * | 2022-04-21 | 2022-07-01 | 河南理工大学 | Electroforming and punching integrated porous copper foil manufacturing system and method |
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| CN108893761A (en) * | 2018-07-20 | 2018-11-27 | 山东理工大学 | A kind of preparation method of lithium ion battery micropore copper foil |
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2018
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| US20120111733A1 (en) * | 2010-11-08 | 2012-05-10 | Chang Chun Petrochemical Co., Ltd. | Method for producing porous copper foil |
| CN102931414A (en) * | 2012-11-01 | 2013-02-13 | 彩虹集团公司 | Preparation process for copper foil for lithium ion battery current collector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983422A (en) * | 2019-12-30 | 2020-04-10 | 中国科学院青海盐湖研究所 | Method for preparing porous copper foil by square wave electrochemical etching |
| WO2021248848A1 (en) * | 2020-06-12 | 2021-12-16 | 九江德福科技股份有限公司 | Method for manufacturing perforated copper coil for shielded cathode plate |
| CN114686961A (en) * | 2022-04-21 | 2022-07-01 | 河南理工大学 | Electroforming and punching integrated porous copper foil manufacturing system and method |
| CN114686961B (en) * | 2022-04-21 | 2023-06-02 | 河南理工大学 | Electroforming and punching integrated porous copper foil manufacturing system and method |
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