CN108011090A - Prepare method, the battery cathode prepared by this method and the lithium ion battery of negative electrode of lithium ion battery - Google Patents
Prepare method, the battery cathode prepared by this method and the lithium ion battery of negative electrode of lithium ion battery Download PDFInfo
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/134—Electrodes based on metals, Si or alloys
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/626—Metals
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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 present invention provides the method for preparing Porous Cu silicon lithium ion battery cathode, including：The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；First reduction treatment is carried out to the copper powder after oxidation, to reduce CuO particle surfaces so as to form the porous steel structure of Lacking oxygen type, between 200nm 500nm, porosity is 20 35% in the aperture of its mesoporous；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, to reduce CuO particle surfaces so as to form the porous steel structure of Lacking oxygen type, between 300nm 600nm, porosity is 25 45% in the aperture of its mesoporous；Copper powder after reduction is mixed with silica flour, then carries out ball milling, wherein the mass ratio of the copper powder and silica flour after reduction is 4:1‑1:1, Ball-milling Time control is 10h 15h, so as to obtain the powder of alloying；Obtained alloying powder is subjected to sieving processing；Then the 3rd reduction treatment is carried out to the alloying powder after sieving.Battery cathode good cycle, after multi-turn circulation, capacity retention ratio is high.
Description
Technical field
The present invention relates to a kind of negative electrode of lithium ion battery preparation method and negative electrode of lithium ion battery, prepared by more particularly to one kind
The method and Porous Cu silicon lithium ion battery cathode of Porous Cu silicon lithium ion battery cathode.
Background technology
Current energy and environment crisis getting worse, the harm brought is drastically consumed to solve non-renewable energy resources, for
The exploitation of new energy becomes more and more important.Lithium ion battery is because have high energy density, memory-less effect, advantages of environment protection
As new energy storage device.Lithium ion battery is generally using activated carbon etc. as negative material, because activated carbon and other carbon materials
Allotrope is expected because cheap, and performance is stablized, and commercial applications, but carbon material theoretical capacity is only
372mAh/g, it is difficult to meet the demand of the power-equipment of rapid development.For the energy density of further lifting lithium ion battery, bear
The selection of pole material and structure design are most important.For cupric oxide because cheap, theoretical capacity is higher to be subject to research field
Pay much attention to.But the poorly conductive of cupric oxide becomes major defect.It is more at present using compound and bag to solve conductivity problems
The mode covered improves the electric conductivity and stability for aoxidizing copper-based anode.Silicium cathode material is because theoretical capacity is up to 4200mAh/g
As the research emphasis of current enterprise and research institutions, but likewise, the poorly conductive of silicon and its coefficient of expansion height so that silicon
It is difficult to separately as commercial li-ion cell negative electrode material, while expansion/contractive effect of silicon easily leads to the dusting of material and takes off
The shortcomings that falling, ultimately resulting in sharp-decay and the short circuit of performance.
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering
It has been the prior art well known to persons skilled in the art when being considered as recognizing or implying the information structure in any form.
The content of the invention
It is more it is an object of the invention to provide preparing the method for Porous Cu silicon lithium ion battery cathode, being prepared by this method
Hole copper silion cell anode and lithium ion battery, so that the shortcomings that overcoming the prior art.
To achieve the above object, the present invention provides a kind of method for preparing Porous Cu silicon lithium ion battery cathode, it is special
Sign is：Method includes：The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；It is right
Copper powder after oxidation carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type is formed to reduce CuO particle surfaces, wherein
The aperture in hole is between 200nm-500nm, porosity 20-35%；Second oxidation processes are carried out to copper powder；To the copper after oxidation
Powder carries out the second reduction treatment, and to reduce CuO particle surfaces so as to form the porous steel structure of Lacking oxygen type, the aperture of its mesoporous exists
Between 300nm-600nm, porosity 25-45%；Copper powder after reduction is mixed with silica flour, then carries out ball milling, its
The mass ratio of copper powder and silica flour after middle reduction is 4:1-1:1, Ball-milling Time control is 10h-15h, so as to obtain alloying
Powder；Obtained alloying powder is subjected to sieving processing；Then the 3rd is carried out to the alloying powder after sieving and goes back original place
Reason.
Preferably, in above-mentioned technical proposal, copper powder size 5-10um, silica flour particle diameter is 100-150nm.
Preferably, in above-mentioned technical proposal, carrying out the first oxidation processes to copper powder is specially：In 500-600 DEG C of condition
Under, to the oxidation processes of copper powder progress 2-3h.
Preferably, in above-mentioned technical proposal, carrying out the first reduction treatment to the copper powder after oxidation is specially：In hydrogen gas
Under conditions of atmosphere, temperature are 500-600 DEG C, the reduction treatment of 2-3h is carried out to copper powder.
Preferably, in above-mentioned technical proposal, carrying out the second oxidation processes to copper powder is specially：In 550-650 DEG C of condition
Under, to the oxidation processes of copper powder progress 2-3h.
Preferably, in above-mentioned technical proposal, carrying out the second reduction treatment to the copper powder after oxidation is specially：In hydrogen gas
Under conditions of atmosphere, temperature are 550-650 DEG C, the reduction treatment of 2-3h is carried out to copper powder.
Preferably, in above-mentioned technical proposal, method further includes：After the 3rd reduction treatment is carried out to alloying powder,
The alloying powder after the 3rd reduction is corroded using dust technology.
Present invention also offers a kind of Porous Cu silicon lithium ion battery cathode, it is characterised in that：Porous Cu silicon lithium ion electricity
Pond anode is prepared by preceding method.
Present invention also offers a kind of lithium ion battery, it is characterised in that：Lithium ion battery includes Porous Cu silicon lithium ion
Battery cathode, Porous Cu silicon lithium ion battery cathode are prepared by preceding method.
Compared with prior art, the present invention has the advantages that：
The defects of to solve above-mentioned Cu oxide and silicon-based anode.The present invention is using simple oxidation-reduction process in copper
Particle surface formed loose structure, and by obtained Porous Cu presoma and nanoscale silicon powder progress ball milling prepare it is porous
Copper-silicon lithium electricity advanced composite material (ACM), further by after ball milling advanced composite material (ACM) carry out the pore-creating of dust technology anticaustic and
Reduction treatment under hydrogen shield atmosphere, the copper corrosion of part is fallen and reduces copper oxide particle to form hierarchical porous structure electricity
Pole.It is advantageous that：1st, to original copper powders using redox port-creating method twice, first time redox cause it is smaller, compared with
Shallow hole, second of redox cause hole becomes larger to deepen, and are conducive to subsequently compound with Si powder；2nd, the copper of loose structure
Grain can form silicon embedded type structure, buffer volumes expansion effect in mechanical milling process；3rd, porous steel structure has excellent conduction
Property can effectively improve the electronic conduction ability at silicon-copper interface, further improve chemical property；4th, porous steel structure is conducive to carry
The load capacity of high activity silicon, further improves specific capacity；5th, selection raw material is rich in minerals, and preparation method is simple.
Brief description of the drawings
Fig. 1 is the SEM figures of 1 Porous Cu according to an embodiment of the invention.
Embodiment
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.The raw material of the present invention can be purchased from chemical reagent shop, and heat treatment can be in conventional heat-treatment furnace
Middle progress.The porosity of the present invention is defined as " pore area and the ratio of total surface area ".
Embodiment 1
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 200nm, porosity 20%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and between 300nm, porosity is in the aperture of its mesoporous
25%；Copper powder after reduction is mixed with silica flour, then carries out ball milling, wherein the mass ratio of the copper powder and silica flour after reduction
For 4:1, Ball-milling Time control is 10h, so as to obtain the powder of alloying；Obtained alloying powder is carried out at sieving
Reason；Then the 3rd reduction treatment is carried out to the alloying powder after sieving.Preferably, in above-mentioned technical proposal, copper powder size is
5um, silica flour particle diameter are 100nm.Carrying out the first oxidation processes to copper powder is specially：Under conditions of 500 DEG C, 2h is carried out to copper powder
Oxidation processes.Carrying out the first reduction treatment to the copper powder after oxidation is specially：In hydrogen atmosphere, the condition that temperature is 500 DEG C
Under, the reduction treatment of 2h is carried out to copper powder.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 550 DEG C, to copper powder
Carry out the oxidation processes of 2h.Carrying out the second reduction treatment to the copper powder after oxidation is specially：It it is 550 DEG C in hydrogen atmosphere, temperature
Under conditions of, the reduction treatment of 2h is carried out to copper powder.Method further includes：To alloying powder carry out the 3rd reduction treatment it
Afterwards, the alloying powder after the 3rd reduction is corroded using dust technology.
Embodiment 2
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 500nm, porosity 35%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and between 600nm, porosity is in the aperture of its mesoporous
45%；Copper powder after reduction is mixed with silica flour, then carries out ball milling, wherein the mass ratio of the copper powder and silica flour after reduction
For 1:1, Ball-milling Time control is 15h, so as to obtain the powder of alloying；Obtained alloying powder is carried out at sieving
Reason；Then the 3rd reduction treatment is carried out to the alloying powder after sieving.Preferably, in above-mentioned technical proposal, copper powder size is
10um, silica flour particle diameter are 150nm.Carrying out the first oxidation processes to copper powder is specially：Under conditions of 600 DEG C, copper powder is carried out
The oxidation processes of 3h.Carrying out the first reduction treatment to the copper powder after oxidation is specially：In hydrogen atmosphere, the bar that temperature is 600 DEG C
Under part, the reduction treatment of 3h is carried out to copper powder.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 650 DEG C, to copper
Powder carries out the oxidation processes of 3h.Carrying out the second reduction treatment to the copper powder after oxidation is specially：In hydrogen atmosphere, temperature 650
Under conditions of DEG C, the reduction treatment of 3h is carried out to copper powder.Method further includes：To alloying powder carry out the 3rd reduction treatment it
Afterwards, the alloying powder after the 3rd reduction is corroded using dust technology.
Embodiment 3
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 350nm, porosity 30%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and the aperture of its mesoporous is in 500nm, porosity 40%；Will
Copper powder after reduction is mixed with silica flour, then carries out ball milling, wherein the mass ratio of the copper powder and silica flour after reduction is 2:1,
Ball-milling Time control is 12h, so as to obtain the powder of alloying；Obtained alloying powder is subjected to sieving processing；Then
3rd reduction treatment is carried out to the alloying powder after sieving.Preferably, in above-mentioned technical proposal, copper powder size 7um, silica flour
Particle diameter is 120nm.Carrying out the first oxidation processes to copper powder is specially：Under conditions of 550 DEG C, the oxidation of 2.5h is carried out to copper powder
Processing.Carrying out the first reduction treatment to the copper powder after oxidation is specially：Under conditions of hydrogen atmosphere, temperature are 550 DEG C, to copper
Powder carries out the reduction treatment of 2.5h.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 580 DEG C, copper powder is carried out
The oxidation processes of 2.5h.Carrying out the second reduction treatment to the copper powder after oxidation is specially：It it is 580 DEG C in hydrogen atmosphere, temperature
Under the conditions of, the reduction treatment of 2.5h is carried out to copper powder.Method further includes：To alloying powder carry out the 3rd reduction treatment it
Afterwards, the alloying powder after the 3rd reduction is corroded using dust technology.
Embodiment 4
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 300nm, porosity 25%；Without the second redox；Carrying out the first oxidation processes to copper powder is specially：At 750 DEG C
Under conditions of, to the oxidation processes of copper powder progress 10h.Carrying out the first reduction treatment to the copper powder after oxidation is specially：In hydrogen
Under conditions of atmosphere, temperature are 700 DEG C, the reduction treatment of 10h is carried out to copper powder.Remaining condition, step and 1 phase of parameter embodiment
Together.
Embodiment 5
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 100nm, porosity 15%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and the aperture of its mesoporous is in 200nm, porosity 20%；It is right
Copper powder carries out the first oxidation processes：Under conditions of 500 DEG C, the oxidation processes of 1h are carried out to copper powder.After oxidation
Copper powder carries out the first reduction treatment：Under conditions of hydrogen atmosphere, temperature are 500 DEG C, the reduction of 1h is carried out to copper powder
Processing.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 550 DEG C, the oxidation processes of 1h are carried out to copper powder.To oxygen
Copper powder after change carries out the second reduction treatment：Under conditions of hydrogen atmosphere, temperature are 550 DEG C, 1h is carried out to copper powder
Reduction treatment.Remaining condition, step are identical with parameter embodiment 1.
Embodiment 6
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 100nm, porosity 15%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and the aperture of its mesoporous is in 350nm, porosity 30%；It is right
Copper powder carries out the first oxidation processes：Under conditions of 500 DEG C, the oxidation processes of 1h are carried out to copper powder.After oxidation
Copper powder carries out the first reduction treatment：Under conditions of hydrogen atmosphere, temperature are 500 DEG C, the reduction of 1h is carried out to copper powder
Processing.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 700 DEG C, the oxidation processes of 3h are carried out to copper powder.To oxygen
Copper powder after change carries out the second reduction treatment：Under conditions of hydrogen atmosphere, temperature are 700 DEG C, 3h is carried out to copper powder
Reduction treatment.Remaining condition, step are identical with parameter embodiment 1.
Embodiment 7
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 200nm, porosity 25%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and the aperture of its mesoporous is in 250nm, porosity 35%；It is right
Copper powder carries out the first oxidation processes：Under conditions of 500 DEG C, the oxidation processes of 2h are carried out to copper powder.After oxidation
Copper powder carries out the first reduction treatment：Under conditions of hydrogen atmosphere, temperature are 500 DEG C, the reduction of 2h is carried out to copper powder
Processing.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 550 DEG C, the oxidation processes of 1.5h are carried out to copper powder.It is right
Copper powder after oxidation carries out the second reduction treatment：Under conditions of hydrogen atmosphere, temperature are 550 DEG C, copper powder is carried out
The reduction treatment of 1.5h.Remaining condition, step are identical with parameter embodiment 1.
Embodiment 8
The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to copper powder；After oxidation
Copper powder carries out the first reduction treatment, and the porous steel structure of Lacking oxygen type, the aperture of its mesoporous are formed to reduce CuO particle surfaces
In 600nm, porosity 40%；Second oxidation processes are carried out to copper powder；Second reduction treatment is carried out to the copper powder after oxidation, with
Reduction CuO particle surfaces are so as to form the porous steel structure of Lacking oxygen type, and the aperture of its mesoporous is in 800nm, porosity 50%；It is right
Copper powder carries out the first oxidation processes：Under conditions of 900 DEG C, the oxidation processes of 20h are carried out to copper powder.After oxidation
Copper powder carries out the first reduction treatment：Under conditions of hydrogen atmosphere, temperature are 900 DEG C, the reduction of 25h is carried out to copper powder
Processing.Carrying out the second oxidation processes to copper powder is specially：Under conditions of 8500 DEG C, the oxidation processes of 10h are carried out to copper powder.It is right
Copper powder after oxidation carries out the second reduction treatment：Under conditions of hydrogen atmosphere, temperature are 900 DEG C, copper powder is carried out
The reduction treatment of 10h.Remaining condition, step are identical with parameter embodiment 1.
Embodiment 9
The mass ratio of copper powder and silica flour after reduction is 5:1, remaining condition, step are identical with parameter embodiment 1.
Embodiment 10
The mass ratio of copper powder and silica flour after reduction is 2:1, remaining condition, step are identical with parameter embodiment 1.
Embodiment 11
Ball-milling Time control is 5h, remaining condition, step are identical with parameter embodiment 1.
Embodiment 12
Obtained alloying powder is subjected to sieving processing；Then directly using dust technology to the alloying after sieving
Powder is corroded, without the 3rd reduction treatment.Remaining condition, step are identical with parameter embodiment 1.
Embodiment 13
Copper powder size is 4um, remaining condition, step are identical with parameter embodiment 1.
Embodiment 14
Copper powder size is 12um, remaining condition, step are identical with parameter embodiment 1.
Embodiment 15
Silica flour particle diameter is 80nm, remaining condition, step are identical with parameter embodiment 1.
Embodiment 16
Silica flour particle diameter is 170nm, remaining condition, step are identical with parameter embodiment 1.
Embodiment 17
After the 3rd reduction treatment is carried out to alloying powder, dust technology is not used to the alloy after the 3rd reduction
Change powder to be corroded, remaining condition, step are identical with parameter embodiment 1.
Battery cathode is assembled into using the material prepared by embodiment 1-17, tests the battery capacity of battery, tests battery
The method of capacity is method well known in the art, unit mAh/g.Test content includes first circle capacity, capacity after stablizing, 50 circles
Capacity after capacity and 300 circles circulate after circulation.For the ease of comparing, as a result all on the basis of the first circle capacity of embodiment 1 into
Row normalization.
Table 1
It is foregoing to the present invention specific exemplary embodiment description be in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explain that the certain principles of the present invention and its reality should
With so that those skilled in the art can realize and utilize the present invention a variety of exemplaries and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (9)
- A kind of 1. method for preparing Porous Cu silicon lithium ion battery cathode, it is characterised in that：The described method includes：The different copper powder of particle diameter and silica flour are chosen as raw material；First oxidation processes are carried out to the copper powder；First reduction treatment is carried out to the copper powder after oxidation, Lacking oxygen type Porous Cu knot is formed to reduce CuO particle surfaces Structure, wherein the aperture in the hole is between 200nm-500nm, porosity 20-35%；Second oxidation processes are carried out to the copper powder；Second reduction treatment is carried out to the copper powder after oxidation, Lacking oxygen type Porous Cu knot is formed to reduce CuO particle surfaces Structure, wherein the aperture in the hole is between 300nm-600nm, porosity 25-45%；Copper powder after reduction is mixed with the silica flour, then carries out ball milling, wherein copper powder and silica flour after the reduction Mass ratio be 4:1-1:1, Ball-milling Time control is 10h-15h, so as to obtain the powder of alloying；Obtained alloying powder is subjected to sieving processing；Then the 3rd reduction treatment is carried out to the alloying powder after sieving.
- 2. the method as described in claim 1, it is characterised in that：The copper powder size is 5-10um, and the silica flour particle diameter is 100-150nm。
- 3. the method as described in claim 1, it is characterised in that：Carrying out the first oxidation processes to the copper powder is specially： Under conditions of 500-600 DEG C, the oxidation processes of 2-3h are carried out to the copper powder.
- 4. the method as described in claim 1, it is characterised in that：Carrying out the first reduction treatment to the copper powder after oxidation is specially： Under conditions of hydrogen atmosphere, temperature are 500-600 DEG C, the reduction treatment of 2-3h is carried out to the copper powder.
- 5. the method as described in claim 1, it is characterised in that：Carrying out the second oxidation processes to the copper powder is specially： Under conditions of 550-650 DEG C, the oxidation processes of 2-3h are carried out to the copper powder.
- 6. the method as described in claim 1, it is characterised in that：Carrying out the second reduction treatment to the copper powder after oxidation is specially： Under conditions of hydrogen atmosphere, temperature are 550-650 DEG C, the reduction treatment of 2-3h is carried out to the copper powder.
- 7. the method as described in claim 1, it is characterised in that：The method further includes：Carried out to the alloying powder After 3rd reduction treatment, the alloying powder after the 3rd reduction is corroded using dust technology.
- A kind of 8. Porous Cu silicon lithium ion battery cathode, it is characterised in that：The Porous Cu silicon lithium ion battery cathode is to pass through Prepared by the method as described in one of claim 1-7.
- A kind of 9. lithium ion battery, it is characterised in that：The lithium ion battery includes Porous Cu silicon lithium ion battery cathode, described Porous Cu silicon lithium ion battery cathode is being prepared by the method as described in one of claim 1-7.
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| CN110635103A (en) * | 2019-08-29 | 2019-12-31 | 天津工业大学 | Flexible nano porous metal oxide cathode for secondary battery and preparation method thereof |
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