CN111710873B - Method for preparing ultrathin lithium battery copper foil through photocatalytic deposition - Google Patents
Method for preparing ultrathin lithium battery copper foil through photocatalytic deposition Download PDFInfo
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- CN111710873B CN111710873B CN202010583383.5A CN202010583383A CN111710873B CN 111710873 B CN111710873 B CN 111710873B CN 202010583383 A CN202010583383 A CN 202010583383A CN 111710873 B CN111710873 B CN 111710873B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/14—Decomposition by irradiation, e.g. photolysis, particle radiation or by mixed irradiation sources
- C23C18/143—Radiation by light, e.g. photolysis or pyrolysis
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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 method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition, which comprises the following specific operation steps of: s1, photocatalyst preparation: adding 10-15 parts by weight of absolute ethyl alcohol into a container, gradually dropwise adding 5-10 parts of titanic acid mixture into the container by adopting a titration mode, stirring while dropwise adding, continuously stirring for 10-15min after dropwise adding is finished, then adding 20-25 parts of deionized water, and continuously stirring for 1-2 h; s2: and standing for 25-30h after stirring is finished, then putting the mixed solution into an oven for drying, controlling the temperature of the oven to be 70-80 ℃ until bottom precipitates are separated out, grinding the precipitates into powder through an agate mortar to obtain the photocatalyst, and standing aside for later use. According to the invention, copper salt is reduced by photocatalysis, copper is directly deposited on the surface of the aluminum-plastic film, then the aluminum-plastic film is rolled to form the ultrathin copper foil with the thickness of 1-3 microns, the fixed-point deposition is carried out, the punching is avoided, the weight of the rolled copper foil is greatly reduced, the ultrathin copper foil can be made into an ultrathin current collector, and the high-energy-density battery is greatly improved after the weight is reduced.
Description
Technical Field
The invention relates to the technical field of preparation of ultrathin lithium battery copper foils, in particular to a method for preparing an ultrathin lithium battery copper foil through photocatalytic deposition.
Background
In the manufacturing process of the lithium ion battery, a copper foil is required to be used as a negative electrode material, and the copper foil used as the negative electrode of the lithium ion battery often has very strict requirements, so that the copper foil is required to have excellent performances such as electrical conductivity, corrosion resistance, high normal temperature elongation, high tensile strength and low roughness, and meanwhile, as the electronic industry gradually develops towards being lighter and thinner, the copper foil in the lithium ion battery is also required to be further thinner and lighter.
The thickness of the copper foil prepared by the electrolytic copper foil process adopted in the prior art is usually maintained at 6-35 μm, and the copper foil with the thickness below 6 μm is difficult to prepare by the traditional electrode copper foil process, namely the Chinese patent application publication number: CN110438531A discloses a method and a system for preparing an ultrathin copper foil applied to a lithium battery, wherein the method comprises the steps of copper material dissolution, multi-stage filtration, electrolytic foil generation, water washing stripping and passivation drying, wherein: the electrolytic green foil comprises the following specific steps: soaking an anode plate and a cathode roller in a copper electrolyte, adding an additive into the copper electrolyte, uniformly mixing, electrolyzing, and preparing a raw foil on the cathode roller; the additive comprises sodium polydithio-diphenyl sulfonate, N-dimethyl dithioformamide propane sulfonate, hydroxyethyl cellulose and collagen.
The prepared ultra-thin copper foil is heavy in weight and cannot be made into an ultra-thin current collector, so that the performance of the battery is greatly influenced.
Disclosure of Invention
The invention aims to provide a method for preparing an ultra-thin lithium battery copper foil by photocatalytic deposition, which is characterized in that copper is directly deposited on the surface of an aluminum-plastic film by photocatalytic reduction of copper salt, then the copper foil is rolled to form a copper foil with the thickness of 1-3 mu m, fixed-point deposition is carried out, punching is avoided, the weight of the rolled copper foil is greatly reduced, the copper foil can be made into an ultra-thin current collector, the advantage of greatly improving a high-energy density battery after weight reduction is achieved, and the problem that the performance of the battery is greatly influenced because the ultra-thin copper foil prepared by the prior art is heavy and cannot be made into an ultra-thin current collector is solved.
The method for preparing the ultra-thin copper foil of the lithium battery by photocatalytic deposition, provided by the embodiment of the invention, comprises the following specific operation steps:
s1: preparing a photocatalyst: adding 10-15 parts by weight of absolute ethyl alcohol into a container, gradually dropwise adding 5-10 parts of titanic acid mixture into the container by adopting a titration mode, stirring while dropwise adding, continuously stirring for 10-15min after dropwise adding is finished, then adding 20-25 parts of deionized water, and continuously stirring for 1-2 h;
s2: standing for 25-30h after stirring, then putting the mixed solution into an oven for drying, controlling the temperature of the oven at 70-80 ℃ until bottom sediment is separated out, grinding the sediment into powder by an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 50-60 parts of copper sulfate solution by weight, placing the copper sulfate solution in a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 10-15min for full mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 70-75 ℃, and continuously stirring for 1-2 hours to continuously separate out copper and cover the surface of an aluminum plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
Based on the above scheme, in S1, the titanic acid mixture is any one of tetrabutyl titanate, tetraethyl titanate, and tetraisopropyl titanate.
Based on the above scheme, in S2, the calcination temperature is 650-700 ℃.
On the basis of the scheme, the particle size of the photocatalyst after passing through agate mortar powder is 1-10 mu m.
On the basis of the scheme, in S3, the rotation speed of the mechanical stirring is set to be 30-40 r/min.
On the basis of the scheme, in S4, the light source is a 100-150W self-ballasted high-pressure mercury lamp.
On the basis of the scheme, the non-ionic wetting dispersant is one or more of vinyl bis stearamide and glyceryl tristearate. On the basis of the scheme, after the nonionic wetting dispersant is weighed, 5-10 parts of ethanol is added, and the nonionic wetting dispersant is prepared after stirring and mixing.
Based on the above scheme, in S5, the rolling temperature of the lithium battery coated with the copper foil is 40 to 80 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. copper salt is reduced by photocatalysis, copper is directly deposited on the surface of an aluminum plastic film, then rolling is carried out, an ultrathin copper foil with the thickness of 1-3 mu m is formed, fixed-point deposition is carried out, punching is avoided, the weight of the copper foil after rolling is greatly reduced, an ultrathin current collector can be manufactured, and the high-energy-density battery is greatly improved after weight reduction;
2. the photocatalyst is prepared by mixing the titanic acid mixture and absolute ethyl alcohol, so that the purity of the photocatalyst is guaranteed to reach more than 98%, the photocatalyst is guaranteed to be quickly reduced by catalyzing copper salt by using a light source when being used at the later stage, the added dispersing agent can enable the dispersing effect of the catalyst to be optimal, the quick reduction of copper ions is guaranteed, the reduced copper is directly deposited on the surface of an aluminum-plastic film, punching and fixing of a copper foil are not needed, the thickness of the copper foil deposited at a fixed point reaches 1-3 mu m after being rolled, meanwhile, the tensile strength and the high-temperature oxidation resistance of the copper foil are enhanced, and the performance index of the copper foil is also improved when the thickness of the whole copper foil is reduced.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments for further understanding of the features and technical means of the invention and the functions achieved.
Example 1
The embodiment provides a method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition, which comprises the following specific operation steps:
s1: preparing a photocatalyst: adding 10 parts by weight of absolute ethyl alcohol into a container, gradually dropwise adding 5 parts by weight of titanic acid mixture into the container again by adopting a titration mode, stirring while dropwise adding, continuously stirring for 10min after dropwise adding is finished, then adding 20 parts by weight of deionized water, and continuously stirring for 1 h;
s2: standing for 25h after stirring, then putting the mixed solution into an oven for drying, controlling the temperature of the oven at 70 ℃ until bottom precipitate is separated out, grinding the precipitate into powder by an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 50 parts of copper sulfate solution according to the parts by weight, placing the copper sulfate solution into a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 10min for fully mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 70 ℃, and continuously stirring for 1h to continuously separate out copper and cover the surface of an aluminum-plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
In S1, the titanic acid mixture is tetrabutyl titanate.
In S2, the calcination temperature was 650 ℃.
The particle size of the photocatalyst after passing through agate mortar powder is 1 mu m.
In S3, the rotation speed of the mechanical stirring is set to 30 r/min.
In S4, the light source is a 100W self-ballasted high-pressure mercury lamp.
In S3, the dispersant is 1 part by weight, and the dispersant is a nonionic wetting dispersant which is vinyl bis stearamide.
And after the nonionic wetting dispersant is weighed, adding 5 parts of ethanol, and stirring and mixing to obtain the nonionic wetting dispersant.
In S5, the rolling temperature of the lithium battery coated with the copper foil is 40 ℃.
Example 2
The embodiment provides a method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition, which comprises the following specific operation steps:
s1: preparing a photocatalyst: adding 12 parts by weight of absolute ethyl alcohol into the container, gradually dropwise adding 7 parts by weight of titanic acid mixture into the container by adopting a titration mode, stirring while dropwise adding, continuously stirring for 12min after dropwise adding is finished, then adding 21 parts by weight of deionized water, and continuously stirring for 1.2 h;
s2: standing for 27h after stirring, then putting the mixed solution into an oven for drying, controlling the temperature of the oven to be 75 ℃ until bottom sediment is separated out, grinding the sediment into powder by an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 52 parts of copper sulfate solution according to the parts by weight, placing the copper sulfate solution into a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 11min for full mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 72 ℃, and continuously stirring for 1.2 hours to continuously separate out copper and cover the surface of an aluminum plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
In S1, the titanic acid mixture is tetraethyl titanate.
In S2, the calcination temperature was 660 ℃.
The particle size of the photocatalyst after passing through agate mortar powder is 3 mu m.
In S3, the rotation speed of the mechanical stirring is set to be 32 r/min.
In S4, the light source is a 120W self-ballasted high-pressure mercury lamp.
In S3, the dispersant is 2 parts by weight, and the dispersant is a nonionic wetting dispersant which is glyceryl tristearate.
And after the nonionic wetting dispersant is weighed, adding 6 parts of ethanol, and stirring and mixing to obtain the nonionic wetting dispersant.
In S5, the rolling temperature of the lithium battery coated with the copper foil is 50 ℃.
Example 3
The embodiment provides a method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition, which comprises the following specific operation steps:
s1: preparing a photocatalyst: adding 13 parts by weight of absolute ethyl alcohol into the container, gradually dropwise adding 8 parts of titanic acid mixture into the container by adopting a titration mode, stirring while dropwise adding, continuously stirring for 12min after dropwise adding is finished, then adding 23 parts of deionized water, and continuously stirring for 1.3 h;
s2: standing for 28h after stirring, then putting the mixed solution into an oven for drying, controlling the temperature of the oven to be 75 ℃ until bottom sediment is separated out, grinding the sediment into powder through an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 55 parts of copper sulfate solution according to the parts by weight, placing the copper sulfate solution in a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 12min for full mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 73 ℃, and continuously stirring for 1.3h to continuously separate out copper and cover the surface of an aluminum plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
In S1, the titanic acid mixture is tetraisopropyl titanate.
In S2, the calcination temperature was 680 ℃.
The particle size of the photocatalyst after passing through agate mortar powder is 5 mu m.
In S3, the rotation speed of the mechanical stirring is set to 38 r/min.
In S4, the light source was a 130W self-ballasted high-pressure mercury lamp.
In S3, the dispersant is 3 parts by weight, and the dispersant is a nonionic wetting dispersant which is glyceryl tristearate.
And after the nonionic wetting dispersant is weighed, adding 8 parts of ethanol, and stirring and mixing to obtain the nonionic wetting dispersant.
In S5, the rolling temperature of the lithium battery coated with the copper foil is 60 ℃.
Example 4
The embodiment provides a method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition, which comprises the following specific operation steps:
s1: preparing a photocatalyst: adding 14 parts by weight of absolute ethyl alcohol into the container, gradually dropwise adding 9 parts of titanic acid mixture into the container by adopting a titration mode, stirring while dropwise adding, continuously stirring for 14min after dropwise adding is finished, then adding 24 parts of deionized water, and continuously stirring for 1.8 h;
s2: standing for 28h after stirring, then putting the mixed solution into an oven for drying, controlling the temperature of the oven at 78 ℃ until bottom precipitates are separated out, grinding the precipitates into powder by an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 58 parts of copper sulfate solution according to the parts by weight, placing the copper sulfate solution in a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 13min for full mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 74 ℃, and continuously stirring for 1.8 hours to continuously separate out copper and cover the surface of an aluminum plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
In S1, the titanic acid mixture is tetrabutyl titanate.
In S2, the calcination temperature was 680 ℃.
The particle size of the photocatalyst after passing through agate mortar powder is 8 mu m.
In S3, the rotation speed of the mechanical stirring is set to 38 r/min.
In S4, the light source was a 140W self-ballasted high-pressure mercury lamp.
In S3, the dispersing agent is 3 parts by weight, the dispersing agent is a nonionic wetting dispersing agent, and the nonionic wetting dispersing agent is vinyl bis stearamide and glyceryl tristearate, and the mixing ratio is 1: 2.
And after the nonionic wetting dispersant is weighed, adding 8 parts of ethanol, and stirring and mixing to obtain the nonionic wetting dispersant.
In S5, the rolling temperature of the lithium battery coated with the copper foil is 70 ℃.
Example 5
The embodiment provides a method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition, which comprises the following specific operation steps:
s1: preparing a photocatalyst: adding 15 parts by weight of absolute ethyl alcohol into the container, gradually dropwise adding 10 parts by weight of titanic acid mixture into the container again by adopting a titration mode, stirring while dropwise adding, continuously stirring for 15min after dropwise adding is finished, then adding 25 parts by weight of deionized water, and continuously stirring for 2 h;
s2: standing for 30 hours after stirring is finished, then putting the mixed solution into an oven for drying, controlling the temperature of the oven to be 80 ℃ until bottom sediment is separated out, grinding the sediment into powder through an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 60 parts of copper sulfate solution according to the parts by weight, placing the copper sulfate solution into a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 15min for full mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 75 ℃, and continuously stirring for 2 hours to continuously separate out copper and cover the surface of an aluminum-plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
In S1, the titanic acid mixture is tetraethyl titanate.
In S2, the calcination temperature was 700 ℃.
The particle size of the photocatalyst after passing through agate mortar powder is 10 mu m.
In S3, the rotation speed of the mechanical stirring is set to 40 r/min.
In S4, the light source is a 150W self-ballasted high-pressure mercury lamp.
In S3, the dispersing agent is 3 parts by weight, the dispersing agent is a nonionic wetting dispersing agent, the nonionic wetting dispersing agent is vinyl bis stearamide and glyceryl tristearate, and the mixing ratio is 2: 1.
and after the nonionic wetting dispersant is weighed, adding 10 parts of ethanol, and stirring and mixing to obtain the nonionic wetting dispersant.
In S5, the rolling temperature of the lithium battery coated with the copper foil is 80 ℃.
Comparative example
The copper foils prepared in the embodiments 1 to 5 are respectively tested for various indexes such as thickness, tensile strength, elongation, surface roughness and the like; and a comparative example was set, which was manufactured by using a conventional electrolytic copper foil process, and the measured results were as follows:
the table above is a data comparison table of multiple test indexes of the copper foil samples in examples 1 to 5 and a comparison example, and it can be seen that, compared with the comparison sample, the samples 1 to 5 have better tensile strength and elongation and can stably prepare the ultrathin copper foil with the thickness of less than 1 to 3 μm, wherein the preparation method of the example corresponding to example 2 is the best process method, the ultrathin copper foil with the thickness of 1 μm can be prepared under the condition of the method, similarly, compared with the comparison example, the thicknesses of the other examples are obviously reduced, meanwhile, the tensile strength and the high-temperature oxidation resistance of the copper foil are enhanced, and the performance index of the copper foil is also improved when the thickness of the whole copper foil is reduced.
Different from the situation of the prior art, copper salt is reduced by photocatalysis, copper is directly deposited on the surface of an aluminum-plastic film, then rolling is carried out, an ultrathin copper foil is formed, fixed-point deposition is carried out, punching is avoided, the weight of the copper foil after rolling is greatly reduced, an ultrathin current collector can be made, and the high-energy-density battery is greatly improved after weight reduction; the photocatalyst is prepared by mixing the titanic acid mixture and absolute ethyl alcohol, so that the purity of the photocatalyst is guaranteed to be more than 98%, the photocatalyst is guaranteed to be reduced by quickly catalyzing copper salt by using a light source when being used at the later stage, the dispersing effect of the catalyst can be optimal by adding the dispersing agent, the quick reduction of copper ions is guaranteed, the reduced copper is directly precipitated on the surface of an aluminum-plastic film, the copper foil does not need to be punched and fixed, and the thickness of the copper foil deposited at a fixed point reaches 1-3 mu m after being rolled.
The invention is not described in detail, but is well known to those skilled in the art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for preparing an ultrathin lithium battery copper foil by photocatalytic deposition is characterized by comprising the following steps: the specific operation steps are as follows:
s1: preparing a photocatalyst: adding 10-15 parts by weight of absolute ethyl alcohol into a container, gradually dropwise adding 5-10 parts of titanic acid mixture into the container by adopting a titration mode, stirring while dropwise adding, continuously stirring for 10-15min after dropwise adding is finished, then adding 20-25 parts of deionized water, and continuously stirring for 1-2 h;
s2: standing for 25-30h after stirring, then putting the mixed solution into an oven for drying, controlling the temperature of the oven at 70-80 ℃ until bottom sediment is separated out, grinding the sediment into powder by an agate mortar, calcining the powder to prepare the photocatalyst, and standing aside for later use;
s3: preparing an ultrathin lithium battery copper foil: weighing 50-60 parts of copper sulfate solution by weight, placing the copper sulfate solution in a container, adding 1-3 parts of a dispersing agent which is a non-ionic wetting dispersing agent, adding the photocatalyst obtained in the step S2 into the container, and mechanically stirring for 10-15min for full mixing;
s4: placing the mixed solution on the upper part of a light source, placing a lithium battery to be processed to the bottom of a container, adjusting the temperature in the mixed solution to 70-75 ℃, and continuously stirring for 1-2 hours to continuously separate out copper and cover the surface of an aluminum plastic film of the lithium battery to be processed;
s5: and (3) turning off the light source after copper covering, taking out and drying the lithium battery covered with the copper foil, and performing calendaring treatment on the lithium battery covered with the copper foil to obtain the ultrathin lithium battery copper foil.
2. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 1, wherein the method comprises the following steps: in S1, the titanic acid mixture is any one of tetrabutyl titanate, tetraethyl titanate, and tetraisopropyl titanate.
3. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 2, wherein the method comprises the following steps: in S2, the calcination temperature was 650-700 ℃.
4. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 3, wherein the method comprises the following steps: in S2, the photocatalyst has a particle size of 1-10 μm after passing through agate mortar powder.
5. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 4, wherein the method comprises the following steps: in S3, the rotation speed of the mechanical stirring is set to be 30-40 r/min.
6. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 5, wherein the method comprises the following steps: in S4, the light source is a 100-150W self-ballasted high-pressure mercury lamp.
7. The method for preparing the copper foil of the ultra-thin lithium battery by photocatalytic deposition according to any one of claims 1 to 6, wherein: the non-ionic wetting dispersant is one or more of vinyl bis stearamide and glyceryl tristearate.
8. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 7, wherein the method comprises the following steps: and after the nonionic wetting dispersant is weighed, adding 5-10 parts of ethanol, and stirring and mixing to obtain the nonionic wetting dispersant.
9. The method for preparing the copper foil of the ultra-thin lithium battery through photocatalytic deposition according to claim 8, wherein the method comprises the following steps: in S5, the rolling temperature of the lithium battery coated with the copper foil is 40 to 80 ℃.
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