CN107699894B - Chemical corrosion preparation method of microporous battery aluminum foil - Google Patents
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- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
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Abstract
The invention discloses a chemical corrosion preparation method of a microporous battery aluminum foil, belongs to the technical field of preparation of battery aluminum foils, overcomes the defects of the prior art, and aims to provide a chemical corrosion preparation method of a microporous aluminum foil of a high-performance lithium battery, which adopts the following technical scheme: the method comprises the following steps: firstly, cleaning the surface of a rolled battery aluminum foil to remove a lubricant; and step two, completely immersing the cleaned battery aluminum foil into a chemical corrosion solution: the chemical corrosive liquid is salt solution containing Cl with the molar concentration of 0.1-3mol/L‑Containing Fe in a molar concentration of 0.1 to 3mol/L3+And Cu2+The corrosion time is 20-120S; thirdly, cleaning residual liquid on the surface of the corroded aluminum foil of the battery; and fourthly, drying, wherein the method can be widely applied to the field of manufacturing of the microporous aluminum foil of the lithium battery.
Description
Technical Field
The invention discloses a chemical corrosion preparation method of a microporous battery aluminum foil, belonging to the technical field of preparation of battery aluminum foils.
Background
The new material and the clean energy are key development directions of the national level, the lithium ion battery is an energy storage battery cell which is most widely applied in the current energy storage technology, the improvement of the energy storage density of the battery cell is a target pursued all over the world, and the improvement of the energy density of the battery cell mainly depends on the development progress of the anode material and the cathode material of the battery cell, but is also related to the progress of materials such as the anode current collector, the anode binder, the cathode binder, the electrolyte, the diaphragm and the like of the lithium ion battery.
The current collector adopted by the anode of the lithium ion battery is generally composed of an aluminum foil and anode powder (lithium iron phosphate, lithium cobaltate or ternary material) coated on the aluminum foil. The traditional current collector material generally adopts an aluminum foil with a smooth surface, and adopts the aluminum foil with the purity of 99.7% to directly coat active substances, but the aluminum foil with the smooth surface and the active materials are combined loosely, so that the requirements on the quality of raw materials and auxiliary materials and the process are high, the phenomenon of falling off or powder falling of the active substances is easy to occur in the processing and charging and discharging processes, the cyclic charging and discharging efficiency is reduced, the service life of the battery is prolonged, the contact resistance between components is improved, the conductivity of the positive plate is reduced, and the comprehensive performance of the battery is influenced. The comprehensive performance of the lithium ion is seriously influenced. At present, people generally adopt a method of roughening the surface of an aluminum foil to increase the adhesive force between the aluminum foil and positive electrode powder, but the process cannot achieve the expected effect. The separation problem of the anode powder and the aluminum foil can occur when the columnar battery is wound and in the circulating charge and discharge process, so that the product percent of pass is greatly reduced, the service life is greatly shortened, the battery capacity attenuation is obvious, and the influence on the battery using ternary materials is the most serious.
In order to improve the bonding state between the positive aluminum foil current collector and the positive slurry, some enterprises in japan and taiwan developed a microporous copper foil and a microporous aluminum foil, and nine through holes each square centimeter were formed in the two types of positive and negative current collector foils, and the diameter of each through hole was about 1 mm. However, the aluminum foil and the copper foil prepared by the production method need to use a special automatic production line of the battery, and the reason is that the back side slurry seepage phenomenon can occur when the copper foil or the aluminum foil with the diameter of the through hole of 1mm is used on the original automatic production line of the battery, so that the coating on the other side is influenced.
Korean patent nos. CN 103618090a and CN 103617894a disclose an acid-base etching treatment of aluminum foil using an acidic or basic chemical. The obtained aluminum oxide foil has low contact resistance and reduced mechanical strength in the process of removing corrosion. The method for forming holes on the aluminum foil in other countries adopts rolling or laser ablation, the hole forming of the aluminum foil of the invention adopts a salt compound corrosion method, the technical routes are completely different, and the obtained aluminum foil of the microporous battery also has special structure and performance.
Disclosure of Invention
The invention overcomes the defects of the prior art and aims to provide a chemical corrosion preparation method of a high-performance lithium battery microporous aluminum foil.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a chemical corrosion preparation method of a microporous battery aluminum foil is characterized by comprising the following steps: firstly, cleaning the surface of a rolled battery aluminum foil to remove a lubricant; and step two, completely immersing the cleaned battery aluminum foil into a chemical corrosion solution: the chemical corrosion liquid is salt solution and contains molmolCl with a molar concentration of 0.1-3mol/L-Containing Fe in a molar concentration of 0.1 to 3mol/L3+And Cu2+The corrosion time is 20-120S; thirdly, cleaning residual liquid on the surface of the corroded aluminum foil of the battery; and fourthly, drying.
And between the third step and the fourth step, the following steps are arranged: and (5) brightening treatment.
The brightening liquid for brightening treatment comprises: 2-5g/L CrO31-7g/L of Na2Cr2O7•2H2O and NaF of 0.1-1.5 g/L.
The cleaning solution in the first step comprises 5-20g/L NaOH and 40-70g/L Na2CO310-40g/L of Na3PO4And the time in the cleaning solution is more than or equal to 6 s.
The cleaning solution in the third step comprises: the formula of the cleaning solution is as follows: na (Na)2SO4（0.4~0.8）g/L＋CaSO4(0.5-1) g/L + citric acid (0.1-0.3) g/L.
Cleaning after brightening treatment, wherein the formula of the cleaning solution is as follows: na (Na)2SO4（0.4~0.8）g/L＋CaSO4(0.5-1) g/L + citric acid (0.1-0.3) g/L.
In the second step, the upper and lower surfaces of the aluminum foil of the battery are simultaneously soaked in the corrosive liquid, so that the corrosive liquid flows on the upper and lower surfaces of the aluminum foil in a circulating flow mode, and the upper and lower surfaces are corroded uniformly.
In the second step, the chemical etching solution is: 0.1 to 0.8mol/LCuCl2、0.1~1mol/LFeCl3，
The chemical corrosive liquid is as follows: 0.5 to 1.5mol/L NaCl, 0.1 to 0.3mol/L BaCl20.1-0.5 mol/L of CaCl20.1 to 0.5mol/L NH4Cl and 0.1-0.8 mol/L CuCl20.1-1 mol/L FeCl3。
Compared with the prior art, the invention has the following beneficial effects:
the method of the invention comprises the following steps: the chemical corrosion solution is salt solution and contains Cl with the molar concentration of 0.1-3mol/L-Containing Fe in a molar concentration of 0.1 to 3mol/L3+And Cu2+The cation of (2) does not contain acid solution and/or alkali solution, has little pollution to the environment and has convenient control of reaction speed. The etched aluminum foil of the microporous battery can be used as a current collector of the anode of the lithium ion battery.
The aluminum foil of the microporous battery is provided with 1000-1500 through holes with the diameter of 10-50 mu m and 1000-3000 blind holes with the diameter of 10-50 mu m per square centimeter, so that the inner surface and the outer surface of the aluminum foil of the microporous battery are not completely penetrated or isolated, the anode material coated on the aluminum foil is integrated with the aluminum foil, and the adhesion force is obviously improved.
The size of the hole of the microporous battery aluminum foil is far smaller than the pore diameter of the microporous battery aluminum foil prepared in other countries, and the problem that the anode material cannot penetrate through the inner surface and the outer surface of the aluminum foil due to the over-small hole is solved, the surface smoothness of the microporous battery aluminum foil is higher due to the specific size of the hole and the nicks, no flash and burr exist, the joint of the hole and the surface of the aluminum foil is in irregular circular transition, no 90-degree right angle exists, lithium dendrite can be effectively prevented from occurring in the charging and discharging process, and the service life of the battery is prolonged; in addition, the shapes of the micropores are different, the holes on the microporous battery aluminum foil obtained by the chemical etching method are irregular, the pore size is changed within a certain range, the diameter of each hole is also changed in different directions, and the irregular holes are more favorable for improving the binding force between the aluminum foil and the anode slurry. The method does not need to change the existing production process, is easy to popularize, and is suitable for single-side coating and double-side coating.
Compared with the original aluminum foil, the tensile strength of the microporous battery aluminum foil is similar to that of the original aluminum foil; the resistivity of the aluminum foil of the microporous battery is only increased by less than 2%, so that the capacity of the lithium ion battery can be improved by 8-10%. When the anode material is a ternary material, the anode materials on two sides of the aluminum foil are connected into a whole by the aluminum foil of the microporous battery, so that the uniformity of the capacity, the charge-discharge characteristics and other performances of the battery is obviously improved, and the production yield of the battery is improved by 15-20%.
Drawings
Fig. 1 is a microscopic image of the aluminum foil of the microporous battery prepared according to the present invention.
Fig. 2 is a drawing graph of the microporous battery aluminum foil prepared by the present invention.
Detailed Description
Example 1
As shown in fig. 1-2, a microporous battery aluminum foil, a microscopic image of a microporous battery aluminum foil. The aluminum foil for the microporous battery is characterized in that each square centimeter of the aluminum foil for the microporous battery is provided with 1000-1500 through holes with uneven diameters of 10-15 mu m and 1000-3000 blind holes with uneven diameters of 10-50 mu m, each through hole and each blind hole are in irregular shapes, the joint of each hole and the surface of the aluminum foil is in irregular circular arc transition, and the diameters of the holes in different directions are different; the upper and lower surfaces of the aluminum foil are distributed with a plurality of nicks with different lengths and depths, the nicks have the depth of 1-3 mu m, the width of 1-5 mu m and the lengths of 100-1000 mu m, the thickness of the battery aluminum foil is 15 mu m, and the nicks can also be selected from 10 mu m, 12 mu m, 16 mu m, 20 mu m and the like.
The microporous metal material, namely the microporous battery aluminum foil, is prepared by adopting a chemical liquid corrosion method and is carried out according to the following steps:
1) cleaning the surface of the rolled battery aluminum foil to remove a lubricant: the first cleaning solution comprises 5g/L NaOH and 70g/L Na2CO340g/L of Na3PO4The rolled aluminum foil was passed through the first cleaning solution, and the time for which the rolled aluminum foil was held in the first cleaning solution was 6 seconds.
2) Pressing the cleaned aluminum foil into a chemical etching solution: the chemical corrosion liquid comprises the following components: 0.5mol/L NaCl, 0.1mol/L BaCl20.1mol/L of CaCl20.1mol/L NH4Cl, 0.1mol/L CuCl20.1mol/L FeCl3The residence time of the aluminum foil in the corrosive agent is 20s, and in the stage, the upper surface and the lower surface of the aluminum foil are ensured to be simultaneously soaked in the corrosive liquid, and the corrosive liquid flows on the upper surface and the lower surface of the aluminum foil in a circulating flow mode, so that the upper surface and the lower surface are corroded uniformly.
3) Cleaning the corroded aluminum foil: the second cleaning solution is 0.4-0.8 g/LNa2SO4、0.5—1g/LCaSO40.1-0.3 g/L citric acid on the upper and lower surfaces of the aluminum foilAnd spraying a second cleaning solution by using the spray head for cleaning.
4) And (3) brightening treatment: the brightening solution is 2g/L CrO31g/L of Na2Cr2O7•2H2O and 0.1g/L NaF, and carrying out surface brightening treatment on the cleaned aluminum foil.
5) And (3) cleaning the brightened aluminum foil again: and cleaning the brightened aluminum foil again by using a second cleaning solution.
6) Drying treatment: and drying the aluminum foil cleaned again at the temperature of 200 ℃.
7) And (6) rolling a finished product.
Fig. 1 is a micro-porous metal material, which is a battery aluminum foil, a micro-image of which is shown. As can be seen from figure 1, the inner surface and the outer surface of the aluminum foil of the microporous battery are not completely penetrated or isolated, the anode material coated on the aluminum foil is integrated with the aluminum foil, and the adhesion is obviously improved.
Fig. 2 is a drawing curve of a microporous metal material, wherein the material is a battery aluminum foil, curve 1 is a drawing curve of a primary battery aluminum foil, and curve 2 is a drawing curve of a microporous battery aluminum foil, and the tensile property of the microporous battery aluminum foil after chemical corrosion is not reduced but is similar or improved compared with the primary battery aluminum foil.
The microporous metal material of the present embodiment is a battery aluminum foil, and is assembled into a lithium ion battery by making an aluminum foil current collector: 8.5g of lithium iron phosphate, 1.0g of acetylene black and 0.5g of PVDF are weighed, 20g of NMP is added, and the mixture is fully stirred to form uniformly mixed slurry. Then the obtained product is blade-coated on an aluminum foil current collector of the microporous battery processed in the embodiment 1 of the invention, dried to constant weight at 80 ℃ under the vacuum of 0.01MPa, rolled under the pressure of 10-15 MPa to be pressed into a lithium iron phosphate electrode, and cut into a positive electrode wafer. Similarly, 4.25g of graphite, 0.5g of acetylene black and 0.25g of styrene butadiene rubber binder are weighed, 10g of NMP is added, the mixture is fully stirred to form uniformly mixed slurry, and then the uniformly mixed slurry is blade-coated on a common copper foil cleaned by ethanol and pressed into a negative plate. And (3) sequentially laminating the positive plate, the celgard2400 polypropylene porous membrane diaphragm and the negative plate to form a battery core, sealing the battery core by using a battery shell, injecting 1mol/L LiBF 4/diethyl carbonate electrolyte into the battery shell, and sealing the electrolyte injection port after the battery shell is filled with the electrolyte to obtain the lithium ion battery.
The lithium ion battery assembled in the embodiment is subjected to 1C charge-discharge test by using a charge-discharge tester at the temperature of 60 ℃ and within the voltage range of 2.5-4.2V, the 3 rd discharge specific capacity is 179mAh/g, and after 300 charge-discharge cycles, the capacity retention rate is 95.6%.
To further illustrate the advantageous effects of the present invention, the following comparative examples were specifically set forth:
8.5g of lithium iron phosphate, 1.0g of acetylene black and 0.5g of PVDF are weighed, 20g of NMP is added, and the mixture is fully stirred to form uniformly mixed slurry. Then the anode material is coated on a common aluminum foil cleaned by ethanol, dried to constant weight under the vacuum of 0.01MPa at the temperature of 80 ℃, rolled to form a lithium iron phosphate electrode under the pressure of 10-15 MPa, and cut into anode wafers. Similarly, 4.25g of graphite, 0.5g of acetylene black and 0.25g of styrene butadiene rubber binder are weighed, 10g of NMP is added, the mixture is fully stirred to form uniformly mixed slurry, and then the uniformly mixed slurry is blade-coated on a common copper foil cleaned by ethanol and pressed into a negative plate. And (3) sequentially laminating the positive plate, the celgard2400 polypropylene porous membrane diaphragm and the negative plate to form a battery core, sealing the battery core by using a battery shell, injecting 1mol/L LiBF 4/diethyl carbonate electrolyte into the battery shell, and sealing the liquid injection port after the battery shell is filled with the electrolyte to obtain the lithium ion battery.
Through detection, after the lithium ion battery obtained in the comparative example is subjected to 300 charge-discharge cycles, the capacity retention rate is 82.5%. Therefore, the aluminum foil current collector of the microporous battery prepared by the embodiment has the advantages that the holes with irregular shapes are more favorable for improving the adhesive force between the aluminum foil and the anode slurry, the falling of the anode material can be avoided, and the cycle stability and the service life of the lithium ion battery are improved.
Due to the holes and nicks with specific sizes, the aluminum foil of the microporous battery has higher surface smoothness without flash and burrs, and the joint of the holes and the aluminum foil surface is in irregular arc transition without a 90-degree right angle, so that lithium dendrite can be effectively prevented from occurring in the charging and discharging process, and the service life of the battery is prolonged; in addition, the shapes of the micropores are different, the holes on the microporous battery aluminum foil obtained by the chemical etching method are irregular, the pore size is changed within a certain range, the diameter of each hole is also changed in different directions, and the irregular holes are more favorable for improving the binding force between the aluminum foil and the anode slurry. The method does not need to change the existing production process, is easy to popularize, and is suitable for single-side coating and double-side coating.
Compared with the original aluminum foil, the tensile strength of the microporous battery aluminum foil is similar to that of the original aluminum foil; the resistivity of the aluminum foil of the microporous battery is only increased by less than 3 percent, so that the capacity of the lithium ion battery can be improved by 8 to 10 percent. When the anode material is made of ternary material, the anode materials on two sides of the aluminum foil are connected into a whole by the aluminum foil of the microporous battery, so that the uniformity of the capacity, the charge-discharge characteristics and other performances of the battery is obviously improved, and the production yield of the battery is improved by 15-20%.
Table 1 shows the following comparison of the resistivity of the aluminum foil and the original aluminum foil of the microporous battery manufactured according to the present invention:
table 2 shows the comparison of mechanical properties between the aluminum foil and the original aluminum foil of the microporous battery manufactured according to the present invention as follows:
example 2
A kind of cellular metal material, its material is the battery aluminium foil, the aluminium foil of this cellular battery has 1000-1500 diameters in the uneven through hole of 10-15 microns of size and 1000-3000 diameters in the uneven blind hole of 10-50 microns of size on every square centimeter, every through hole and blind hole are irregular shapes, every hole and aluminium foil surface junction are the irregular circular arc transition, and the diameter in different directions is different; the upper and lower surfaces of the aluminum foil are distributed with a plurality of nicks with different lengths and depths, the nicks have the depth of 1-3 mu m, the width of 1-5 mu m and the lengths of 100-1000 mu m, the thickness of the battery aluminum foil is 15 mu m, and the nicks can also be selected from 10 mu m, 12 mu m, 16 mu m, 20 mu m and the like.
The aluminum foil of the microporous battery is prepared by adopting a chemical liquid corrosion method and comprises the following steps:
1) cleaning the surface of the rolled battery aluminum foil to remove a lubricant: the first cleaning solution comprises 5g/L NaOH and 70g/L Na2CO340g/L of Na3PO4The rolled aluminum foil was passed through the first cleaning solution and held in the first cleaning solution for 10 seconds.
2) Pressing the cleaned aluminum foil into a chemical etching solution: the chemical corrosion liquid comprises the following components: 1.5mol/L NaCl, 0.3mol/L BaCl20.5mol/L of CaCl20.5mol/L NH4Cl, 0.8mol/L CuCl21mol/L FeCl3The residence time of the aluminum foil in the corrosive agent is 120s, and in the stage, the upper surface and the lower surface of the aluminum foil are ensured to be simultaneously soaked in the corrosive liquid, and the corrosive liquid flows on the upper surface and the lower surface of the aluminum foil in a circulating flow mode, so that the upper surface and the lower surface are corroded uniformly.
3) Cleaning the corroded aluminum foil: the second cleaning solution is prepared by collecting 0.4-0.8 g/L Na2SO40.5-1 g/L of CaSO40.1-0.3 g/L of citric acid, and spraying a second cleaning solution on the upper surface and the lower surface of the aluminum foil by using a spray head for cleaning.
4) And (3) brightening treatment: the brightening solution is composed of 5g/L CrO37g/L of Na2Cr2O7•2H2O and 1.5g/L NaF, and carrying out surface brightening treatment on the cleaned aluminum foil.
5) And (3) cleaning the brightened aluminum foil again: and cleaning the brightened aluminum foil again by using a second cleaning solution.
6) Drying treatment: and drying the aluminum foil cleaned again at the temperature of 300 ℃.
7) And (6) rolling a finished product.
Example 3
The chemical corrosion preparation method of the aluminum foil of the microporous battery is carried out according to the following steps:
1) cleaning the surface of the rolled battery aluminum foil to remove a lubricant: the first cleaning solution comprises 20g/L NaOH and 40g/L Na2CO310g/L of Na3PO4The rolled aluminum foil was passed through the first cleaning solution and held in the first cleaning solution for 10 seconds.
2) Pressing the cleaned aluminum foil into a chemical etching solution: the chemical corrosion liquid comprises the following components: 1.5mol/L NaCl, 0.3mol/L BaCl20.2mol/L of CaCl20.5mol/L of CuCl20.3mol/L FeCl3The residence time of the aluminum foil in the corrosive agent is 60s, and in the stage, the upper surface and the lower surface of the aluminum foil are ensured to be simultaneously soaked in the corrosive liquid, and the corrosive liquid flows on the upper surface and the lower surface of the aluminum foil in a circulating flow mode, so that the upper surface and the lower surface are corroded uniformly.
3) Cleaning the corroded aluminum foil: the second cleaning solution is prepared by collecting 0.4-0.8 g/L Na2SO40.5-1 g/L of CaSO40.1-0.3 g/L of citric acid, and spraying a second cleaning solution on the upper surface and the lower surface of the aluminum foil by using a spray head for cleaning.
4) And (3) brightening treatment: the brightening solution is 3g/L CrO35g/L of Na2Cr2O7•2H2O and 1g/L NaF, and carrying out surface brightening treatment on the cleaned aluminum foil.
5) And (3) cleaning the brightened aluminum foil again: and cleaning the brightened aluminum foil again by using a second cleaning solution.
6) Drying treatment: and drying the aluminum foil cleaned again at the temperature of 250 ℃.
7) And (6) rolling a finished product.
In the step 2, the chemical etchant may also be formulated as follows:
and fourthly: the chemical corrosion liquid comprises the following components: 0.5mol/L NaCl, 1mol/L BaCl20.1mol/L of CaCl20.2mol/L of CuCl20.3mol/L FeCl3。
And a fifth mode: the chemical corrosion liquid comprises the following components: 1mol/L NaCl, 0.3mol/L CaCl20.1mol/L of CuCl20.2mol/L FeCl3。
And a sixth mode: the chemical corrosion liquid comprises the following components: 1mol/L BaCl20.2mol/L of CaCl20.3mol/L of CuCl20.2mol/L FeCl3。
Seventh, the method comprises: the chemical corrosion liquid comprises the following components: 0.2mol/L NaCl, 0.5mol/L CaCl20.3mol/L NH4Cl, 0.5mol/L CuCl20.2mol/L FeCl3。
An eighth method: the chemical corrosion liquid comprises the following components: 0.1mol/L of CuCl21mol/L FeCl3。
Ninth, the method comprises the following steps: the chemical corrosion liquid comprises the following components: 1.5mol/L of CuCl20.5mol/L FeCl3。
The tenth way: the chemical corrosion liquid comprises the following components: 0.2mol/L NaCl, 0.1mol/L CaCl20.1mol/L NH4Cl, 0.5mol/L CuCl20.5mol/L FeCl3。
An eleventh aspect: the chemical corrosion liquid comprises the following components: 0.5mol/L NaCl, 0.1mol/L BaCl20.1mol/L NH4Cl, 0.1mol/L CuCl20.1mol/L FeCl3。
The twelfth way: the chemical corrosion liquid comprises the following components: 0.5mol/L NaCl, 0.1mol/L BaCl20.1mol/L of CaCl20.5mol/L of CuCl20.5mol/L FeCl3。
A thirteenth species: 0.3mol/L BaCl20.3mol/L of CaCl20.3mol/L of CuCl20.5mol/L FeCl3。
A fourteenth mode: the chemical corrosion liquid comprises the following components: 0.4mol/L NaCl, 0.1mol/L BaCl20.3mol/L of CaCl21mol/L of CuCl20.5mol/L FeCl3。
The fifteenth mode: the chemical corrosion liquid comprises the following components: 0.8mol/L NaCl, 0.1mol/L BaCl20.1mol/L NH4Cl, 0.2mol/L CuCl20.3mol/L FeCl3。
The etching method of the fifteen corrosive agents is the same as or similar to that of the embodiment, and the cleaning liquid and the quantifying liquid can be replaced by the conventional liquid in the field.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A chemical corrosion preparation method of a microporous battery aluminum foil is characterized by comprising the following steps:
firstly, cleaning the surface of a rolled battery aluminum foil to remove a lubricant;
and step two, putting all the cleaned battery aluminum foils into a chemical corrosion solution: the chemical corrosive liquid is a salt solution, and the corrosion time is 20-120 s;
thirdly, cleaning residual liquid on the surface of the corroded aluminum foil of the battery;
fourthly, drying;
the chemical corrosive liquid is as follows: 0.5-1.5 mol/L NaCl and 0.1-O.3mol/L BaCl20.1-0.5 mol/L of CaCl20.1 to 0.5mol/L NH4Cl and 0.1-0.8 mol/L CuCl20.1-lmol/L FeCl3。
2. The chemical corrosion method for preparing the aluminum foil of the microporous battery as claimed in claim 1, wherein between the third step and the fourth step: and (5) brightening treatment.
3. The chemical etching method for preparing aluminum foil for micro-porous battery as claimed in claim 2, wherein the brightening solution for brightening comprises: 2-5g/L CrO31-7g/L of Na2Cr2O7·2H2O and NaF of 0.1-1.5 g/L.
4. The method of claim 1, wherein the cleaning solution in the first step comprises NaOH 5-20g/L and Na 40-70g/L2CO310-40g/L of Na3PO4And the time in the cleaning solution is more than or equal to 6 s.
5. The chemical corrosion method for preparing aluminum foil of microporous battery as claimed in claim 1, wherein the third step of cleaning solution comprises: na (Na)2SO40.4～0.8g/L+CaSO40.5-1 g/L + citric acid 0.1-0.3 g/L.
6. The chemical corrosion preparation method of the microporous battery aluminum foil according to claim 2, characterized in that the brightening treatment is followed by cleaning, and the cleaning solution comprises the following components: na (Na)2SO40.4～0.8g/L+CaSO40.5-1 g/L + citric acid 0.1-0.3 g/L.
7. The chemical corrosion preparation method of the aluminum foil of the microporous battery according to claim 1, characterized in that: in the second step, the upper and lower surfaces of the aluminum foil of the battery are simultaneously soaked in the corrosive liquid, so that the corrosive liquid flows on the upper and lower surfaces of the aluminum foil in a circulating flow mode, and the upper and lower surfaces are corroded uniformly.
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| CN101503801A (en) * | 2009-03-30 | 2009-08-12 | 日丰（清远）电子有限公司 | Aluminum foil corrosion technique for electrolytic capacitor |
| CN105734598A (en) * | 2016-03-29 | 2016-07-06 | 浙江道明光电科技有限公司 | Environment-friendly chemical surface treatment method of aluminum foil in aluminum plastic film for lithium battery packing |
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| CN101423946A (en) * | 2008-07-29 | 2009-05-06 | 东莞市东阳光电容器有限公司 | Technique for preparing etched foil of medium-high voltage anode foil for energy-saving lamp |
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| CN105734598A (en) * | 2016-03-29 | 2016-07-06 | 浙江道明光电科技有限公司 | Environment-friendly chemical surface treatment method of aluminum foil in aluminum plastic film for lithium battery packing |
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