CN107146882A - A kind of lithium-sulfur cell anode composite and preparation method thereof - Google Patents
A kind of lithium-sulfur cell anode composite and preparation method thereof Download PDFInfo
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Abstract
The invention provides a kind of lithium-sulfur cell anode composite and preparation method thereof.The lithium-sulfur cell anode composite is mainly made up of the mixing sprayed coating, carbon/sulphur slurry scraping coating, ferroelectric material sprayed coating of ferroelectric material and graphene.Two layers of sprayed coating of the present invention can alleviate the volumetric expansion in positive electrode charge and discharge process, maintain Stability Analysis of Structures；The dual absorption long-chain polysulphides of two-double spray coating layer, limit the dissolving of polysulfide, effectively solve " shuttle effect ", improve lithium-sulfur cell specific capacity and cycle life；Simple spraying coating process is used in the present invention, the controllable film layer of thickness is sprayed out, suitable for production extensively.
Description
Technical field
The invention belongs to field of electrochemical batteries, more particularly to a kind of lithium-sulfur cell anode composite and preparation method thereof.
Background technology
With the progress and development of society, battery energy storage system plays more and more important effect.On the one hand, Ren Mensheng
The flat raising of running water makes the electronic products such as mobile phone, notebook become the necessity of most people, these electronic products it is quick
Development, requirement to battery also more and more higher.On the other hand, energy crisis and problem of environmental pollution are increasingly protruded, and development can
The renewable sources of energy and electric automobile turn into irrepressible trend.In wind energy, solar energy, effective profit of the regenerative resource such as tide energy
During, the storage of the urgent need to resolve energy and transmission problem, development also urgent need to resolve energy storage and the conversion of electric automobile
Problem, therefore, the research of energy-storage system are extremely urgent.
As one of current most successful energy storage device, lithium ion battery has the close height of energy, self-discharge rate is low, circulate the longevity
The advantages of life length, thing memory effect, the extensive use on all kinds of mobile electronic devices, and the innovation continued with battery, lithium
Ion battery is strided forward towards electric automobile field.However, receiving the limitation of itself lithium storage content of positive pole material, lithium ion battery
Specific capacity and energy density be difficult to the requirement that meets following mobile electronic device.Therefore, sight has been placed on theoretical ratio by people
Capacity is up to sulphur in 1650mAh/g lithium-sulfur cell, lithium-sulfur cell and, in the rich reserves of nature, exploits easy, cheap
And it is environment-friendly, it is up-and-coming battery system of new generation, but lithium-sulfur cell is there is also limiting factor, prevents it from extensively should
For market, wherein most importantly discharging product long-chain sulfide Li2Sx(4≤x≤8) are soluble in organic electrolyte, in lithium
Spread, formed " shuttle effect " back and forth between the both positive and negative polarity of sulphur battery.Shuttle effect not only causes the irreversible of active material sulphur
Loss, increase electrolysis fluid viscosity, reduces specific capacity, coulombic efficiency and the cycle life of battery；In charge and discharge process, shuttle is participated in
The long-chain polysulphides of effect can react the nonconducting short-chain polysulphides Li of generation2S、Li2S2, be deposited on lithium metal surface and
Sulphur positive electrode surface, hinders exoelectrical reaction.
To solve above-mentioned " shuttle effect " problem, scientific research personnel has carried out numerous studies.Keyu Xie et al. [Advanced
Materials, 2016,6,29-34] by adding the dissolving that barium titanate particles limit polysulfide, the party in positive electrode
Case is although simple and easy to apply, but binding agent and conductive agent that barium titanate is made an addition to needed for positive electrode increase, and reduce activity
The relative amount of material sulphur, making the specific discharge capacity of battery reduces, and the capability retention of battery is not high.
The content of the invention
It is an object of the present invention to provide a kind of new lithium-sulfur cell anode composite and preparation method thereof, " shuttle effect is effectively solved
Should ", and improve the performances such as the specific capacity of lithium-sulfur cell, coulombic efficiency.
The solution of the present invention is as follows：
The lithium-sulfur cell anode composite is mainly constituted by three layers：First layer is the mixing spraying of ferroelectric material and graphene
Layer, thickness is 0.2 μm -5 μm；The second layer is carbon/sulphur slurry scraping coating, and thickness is 150 μm -250 μm, wherein nano-sulfur and conduction
The mass ratio of carbon black is 7:2；Third layer is ferroelectric material sprayed coating, and thickness is 0.4 μm -10 μm.
Wherein, the ferroelectric material of first layer and the ferroelectric material of third layer preferably are selected from PbTiO3、BaTiO3、SrTiO3、
LiNbO3、KNbO3、Cd2Nd2O7And PZT.Identical ferroelectric material can be used this two layers, it would however also be possible to employ different ferroelectricity materials
Material.
The preparation method of above-mentioned lithium-sulfur cell anode composite, comprises the following steps：
Step 1) ferroelectric material and graphene mixing sprayed coating preparation
Disperse graphene in NMP, make the concentration of graphene for 1mg/ml-3mg/ml, ferroelectric material is added after ultrasound,
Make the concentration of ferroelectric material for 0.5mg/ml-3mg/ml, after stirring, ultrasound, obtain finely dispersed mixed solution；Then will be mixed
Solution spraying is closed on clean aluminium foil, the thickness of sprayed on material is maintained at 0.2 μm -5 μm, finally by the aluminium foil after spraying in
Dried under vacuum environment, it is standby；
Step 2) carbon/sulphur slurry scraping coating preparation
Scheme one：In mass ratio 7:2:1 weighs nano-sulfur, conductive black (Super P), Kynoar respectively
(PVDF), and respectively at grinding in mortar；Kynoar (PVDF) is added in appropriate solvent, magnetic agitation；Then, plus
The nano-sulfur particles for entering grinding are stirred again, and ultrasound, are obtained after being eventually adding conductive black and supplementing solvent, magnetic agitation
The slurry of composite positive pole, shared mass fraction is 2-4% to the solvent in the slurry；The slurry of composite positive pole is used
The step 1 that scraper blade coating is cleaned in alcohol) on aluminium foil after the spraying, the electrode of 150 μm of -250 μ m-thick is made, in vacuum ring
Positive pole scraping coating is dried to obtain under border, it is standby；
Scheme two：In mass ratio 7:2:1 weighs nano-sulfur, conductive black (Super P), Kynoar respectively
(PVDF), the material mixing weighed is ground into mortar, well mixed positive electrode is obtained；Then, in a nitrogen environment
Normal temperature heats up to 100~110 DEG C of speed with 1 DEG C/min, is then warming up to 155 DEG C~200 DEG C with 0.5 DEG C/min speed,
Finally in this temperature 6h~24h；Uniform anode composite material is combined after being obtained after material cooling；By composite positive pole
It is added in appropriate solvent, the slurry of composite positive pole is obtained after magnetic agitation, the solvent in the slurry divide by shared quality
Number is 2-4%；The slurry of composite positive pole is scratched to the step 1 cleaned in alcohol with scraper) on aluminium foil after the spraying,
The electrode of 150 μm of -250 μ m-thick is made, positive pole scraping coating is dried to obtain under vacuum conditions, it is standby；
Step 3) ferroelectric material sprayed coating preparation
Ferroelectric material particle after grinding is scattered in NMP, the concentration for making ferroelectric material is 1mg/ml-5mg/ml, is stirred
Mix and ultrasound, finely dispersed ferroelectric material solution obtained, then by the ferroelectric material solution spraying of gained in step 2) obtain
Positive pole blade coating layer surface, the thickness of ferroelectric material sprayed coating is maintained at 0.4 μm -10 μm, finally by the positive pole pole after spraying
Piece obtains final lithium-sulfur cell anode composite in being dried under vacuum environment.
On the basis of above scheme, the present invention has also further made following optimization to technique：
Step 1) in spraying mixed solution be specifically spray gun that gained mixed solution is placed in the glove box full of nitrogen
In then sprayed.
Step 2) second scheme in, grinding obtain well mixed positive electrode after, be in the hand full of nitrogen
Mixing material is put into water heating kettle in casing, water heating kettle is transferred in the tube furnace filled with nitrogen, heating ring is then carried out
Section.
Step 3) in spraying ferroelectric material solution be specifically that the ferroelectric material solution of gained is placed in the gloves full of nitrogen
Then sprayed in spray gun in case.
Step 2) described in the preferred 1-METHYLPYRROLIDONE of solvent (NMP).Also other solvents can be changed to, such as some water
The solvent of system, certainly, solvent to S solubility will very low (preferably do not dissolve), while again binding agent fine can must be dissolved, boil
Point should be relatively low.
Present invention employs ferroelectric material, technique is simple, and efficiently solves " shuttle effect ", improves lithium-sulfur cell
Specific capacity, the performance such as coulombic efficiency.Specifically have the advantage that：
1) simple spraying coating process is used in the present invention, sprays out the controllable film layer of thickness, suitable for production extensively.
2) two layers of sprayed coating can alleviate the volumetric expansion in positive electrode charge and discharge process, maintain Stability Analysis of Structures.
3) the dual absorption long-chain polysulphides of two-double spray coating layer, limit the dissolving of polysulfide, effectively solve " shuttle effect
Should ", improve lithium-sulfur cell specific capacity and cycle life.
4) first layer ferroelectric material and graphene mixing sprayed coating can strengthen the caking property between aluminium foil and positive electrode, protect
Hold the stability of structure.
5) first layer ferroelectric material and graphene mixing sprayed coating can strengthen electronic conductivity.
Brief description of the drawings
Fig. 1 is lithium-sulfur cell anode composite hierarchy schematic diagram of the invention.
Wherein, the mixing sprayed coating of 1-ferroelectric material and graphene, 2-carbon/sulphur slurry scraping coating, the spray of 3-ferroelectric material
Coating.
Embodiment
Anode composite is constituted by three layers in the present invention, and first layer is ferroelectric material (PbTiO3, BaTiO3, SrTiO3,
LiNbO3, KNbO3, Cd2Nd2O7, PZT etc.) and graphene mixing sprayed coating, the second layer is carbon/sulphur slurry scraping coating, third layer
For ferroelectric material sprayed coating.
Wherein, the first layer graphene ferroelectric material mixed layer strengthens the electric conductivity of positive electrode, adsorbs many to a certain extent
Sulfide, alleviates the volumetric expansion of positive electrode in charge and discharge process；Third layer ferroelectric material layer, alleviates volumetric expansion, simultaneously
Effectively prevent polysulfide from being dissolved in organic electrolyte, reduce the loss of active material, improve specific capacity and the storehouse of battery
Human relations efficiency.This method uses spraying coating process, compared with suction filtration, and spraying can control the thickness of film well；With ferroelectric material
Compared directly as additive, reduce the usage amount of ferroelectric material, accordingly, the amount of the binding agent needed for positive electrode
Reduce, so as to improve the relative amount of active material.
The lithium-sulphur cell positive electrode of the present invention is modified and preparation method, mainly there is following steps：
Step 1, the preparation of ferroelectric material and graphene mixing sprayed coating.
Disperse graphene in NMP, the concentration for making graphene is 1mg/ml-3mg/ml, ultrasonic 0.5h, is subsequently added iron
Electric material, the concentration for making ferroelectric material is 0.5mg/ml-3mg/ml, stirring 0.5h and ultrasound 0.5h, obtains finely dispersed mixed
Close solution；Then the solution of gained is placed in the spray gun in the glove box full of nitrogen, mixed solution is then sprayed at wine
On the net aluminium foil of fine purifiation, the thickness of mixing material is set to be maintained at 0.2 μm -5 μm, finally by the aluminium foil after spraying in vacuum drying chamber
In, 12h-24h is dried at 60 DEG C.
Step 2, the preparation of carbon/sulphur slurry scraping coating：
Method one, in mass ratio 7:2:1 weighs 70mg nano-sulfurs, 20mg conductive blacks (Super P), 10mg respectively gathers inclined
PVF (PVDF), and respectively at grinding 0.5h-1h in mortar.First, PVDF is added to 0.5mg 1-METHYLPYRROLIDONEs
(NMP) in solution, magnetic agitation 2h-6h；Then, the nano-sulfur particles stirring 0.5h of grinding, and ultrasound 1h (ultrasonic powers are added
For 300W-500W), it is eventually adding the slurry that composite positive pole is obtained after conductive black and 2-4mg NMP, magnetic agitation 12h
Material, is scratched on the aluminium foil cleaned in alcohol with scraper, the electrode of 150 μm of -250 μ m-thick is made, in 60 DEG C of conditions of vacuum drying chamber
Lower dry 12h-24h, obtains positive pole scraping coating.
Method two, in mass ratio 7:2:1 weighs 70mg nano-sulfurs, 20mg conductive blacks (Super P), 10mg respectively gathers inclined
PVF (PVDF), by the material mixing weighed into mortar, and grinds 0.5h-1h, obtains well mixed positive electrode；With
Afterwards, mixing material is put into water heating kettle in the glove box full of nitrogen, water heating kettle is transferred to the tube furnace filled with nitrogen
In, normal temperature to 100~110 DEG C of speed with 1 DEG C/min heats up, and is then warming up to 155 DEG C~200 with 0.5 DEG C/min speed
DEG C, finally in this temperature 6h~24h.Uniform anode composite material is combined after being obtained after material cooling.By anode composite
Material is added in 2mg-4mgN- methyl pyrrolidones (NMP), and the slurry of composite positive pole is obtained after magnetic agitation 2h, is used
The electrode of 150 μm of -250 μ m-thick is made on the aluminium foil that alcohol is cleaned in scraper blade coating, is dried under the conditions of 60 DEG C of vacuum drying chamber
12h-24h, obtains positive pole scraping coating.
Step 3, the preparation of ferroelectric material sprayed coating.
Ferroelectric material particle after grinding is scattered in NMP, the concentration for making ferroelectric material is 1mg/ml-5mg/ml, is stirred
0.5h and ultrasound 0.5h are mixed, finely dispersed ferroelectric material solution is obtained, the solution of gained is then placed in the hand full of nitrogen
In spray gun in casing, ferroelectric material is then sprayed to the positive electrode surface of step 2, the thickness of ferroelectric material layer is maintained at
0.4 μm -10 μm, finally by the anode pole piece after spraying in vacuum drying chamber, 12h-24h is dried at 60 DEG C, obtains final
Lithium-sulphur cell positive electrode.
Embodiment one：
Disperse graphene in NMP, the concentration for making graphene is 1mg/ml, ultrasonic 0.5h, is subsequently added after grinding
Potassium niobate (KNbO3), make KNbO3Concentration be 2mg/ml, stirring 0.5h and ultrasound 0.5h, obtain finely dispersed mixed solution；
Then the solution of gained is placed in the spray gun in the glove box full of nitrogen, mixed solution is then sprayed at what alcohol was cleaned
On aluminium foil, the thickness of mixing material is maintained at 2 μm, finally by the aluminium foil after spraying in vacuum drying chamber, dried at 60 DEG C
18h。
In mass ratio 7:2:1 weighs 105mg nano-sulfurs, 30mg conductive blacks (Super P) and 15mg polyvinylidene fluorides respectively
Alkene (PVDF), and respectively at grinding 0.5h in mortar.First, PVDF is added to 0.5mgN- methyl pyrrolidones (NMP) solution
In, magnetic agitation 6h；Then, the nano-sulfur particles stirring 0.5h of grinding, and ultrasound 1h (ultrasonic power is 300W) are added, finally
The slurry that composite positive pole is obtained after conductive black and 3mg NMP, magnetic agitation 12h is added, is washed with scraper blade coating in alcohol
On net aluminium foil, scraping coating thickness is 150 μm, and 24h is dried under the conditions of 60 DEG C of vacuum drying chamber, positive pole scraping coating is obtained.
By the potassium niobate (KNbO after grinding3) particle is scattered in NMP, makes KNbO3Concentration be 1mg/ml, stir 0.5h
And ultrasound 0.5h, obtain finely dispersed KNbO3Solution, the spray that then solution of gained is placed in the glove box full of nitrogen
In rifle, then by KNbO3Positive pole blade coating layer surface is sprayed at, makes KNbO3Layer thickness be maintained at 4 μm, finally by after spraying just
Pole pole piece dries 12h, obtains final lithium-sulphur cell positive electrode in vacuum drying chamber at 60 DEG C.
Positive pole is assembled into battery, after being circulated under 0.2C discharge rates through 100 times, its reversible specific capacity is 567mAh/
G, capability retention is 76%.
Embodiment two：
Disperse graphene in NMP, the concentration for making graphene is 2mg/ml, ultrasonic 0.5h, is subsequently added after grinding
Barium titanate (BaTiO3), make BaTiO3Concentration be 1mg/ml, stirring 0.5h and ultrasound 0.5h, obtain finely dispersed mixing molten
Liquid；Then the solution of gained is placed in the spray gun in the glove box full of nitrogen, mixed solution then is sprayed at into alcohol washes
On net aluminium foil, the thickness of mixing material is set to be maintained at 1.5 μm, finally by the aluminium foil after spraying in vacuum drying chamber, 60 DEG C
Lower dry 20h.
In mass ratio 7:2:1 weighs 105mg nano-sulfurs, 30mg conductive blacks (Super P), 15mg Kynoar respectively
(PVDF), by the material mixing weighed into mortar, and 1h is ground, obtains well mixed positive electrode；Then, full of nitrogen
Mixing material is put into water heating kettle in the glove box of gas, water heating kettle is transferred in the tube furnace filled with nitrogen, normal temperature to 100
DEG C heated up with 1 DEG C/min speed, then 155 DEG C are warming up to 0.5 DEG C/min speed, finally in this temperature 12h.Treat
Obtained after material cooling and be combined uniform anode composite material.Composite positive pole is added to 2.5mg 1-METHYLPYRROLIDONEs
(NMP) in, the slurry of composite positive pole is obtained after magnetic agitation 2h, is scratched with scraper on the aluminium foil cleaned in alcohol, blade coating
Thickness degree is 150 μm, and 12h is dried under the conditions of 60 DEG C of vacuum drying chamber, positive pole scraping coating is obtained.
By the ferroelectric material barium titanate (BaTiO after grinding3) particle is scattered in NMP, makes BaTiO3Concentration be 3mg/
Ml, stirring 0.5h and ultrasound 0.5h, obtain finely dispersed BaTiO3The solution of gained, is then placed in full of nitrogen by solution
In spray gun in glove box, then by BaTiO3The positive electrode surface of blade coating is sprayed at, makes BaTiO3The thickness of layer is maintained at 8 μm, most
Afterwards by the anode pole piece after spraying in vacuum drying chamber, 12h is dried at 60 DEG C, final lithium-sulphur cell positive electrode is obtained.
Positive pole is assembled into battery, after being circulated under 0.2C discharge rates through 100 times, its reversible specific capacity is 656mAh/
G, capability retention is 81%.
Embodiment three：
Disperse graphene in NMP, the concentration for making graphene is 2.5mg/ml, ultrasonic 0.5h, is subsequently added after grinding
Burnt cadmium niobate (Cd2Nd2O7), make Cd2Nd2O7Concentration be 0.5mg/ml, stirring 0.5h and ultrasound 0.5h, be uniformly dispersed
Mixed solution；Then the solution of gained is placed in the spray gun in the glove box full of nitrogen, then sprayed mixed solution
In on the aluminium foil that alcohol is cleaned, the thickness of mixing material is set to be maintained at 1 μm, finally by the aluminium foil after spraying in vacuum drying chamber
In, 16h is dried at 60 DEG C.
Step 2, the preparation of positive pole scraping coating is identical with case two.
By the burnt cadmium niobate (Cd of ferroelectric material after grinding2Nd2O7) be scattered in NMP, make Cd2Nd2O7Concentration be 2mg/
Ml, stirring 0.5h and ultrasound 0.5h, obtain finely dispersed Cd2Nd2O7The solution of gained, is then placed in full of nitrogen by solution
Glove box in spray gun in, then by Cd2Nd2O7The positive electrode surface of blade coating is sprayed at, makes Cd2Nd2O7The thickness of layer is maintained at 6
μm, finally by the anode pole piece after spraying in vacuum drying chamber, 12h is dried at 60 DEG C, final lithium-sulphur cell positive electrode is obtained.
Positive pole is assembled into battery, after being circulated under 0.2C discharge rates through 100 times, its reversible specific capacity is 607mAh/
G, capability retention is 74%.
Example IV：
Disperse graphene in NMP, the concentration for making graphene is 2.5mg/ml, ultrasonic 0.5h, is subsequently added after grinding
Lead titanates (PbTiO3), make PbTiO3Concentration be 1mg/ml, stirring 0.5h and ultrasound 0.5h, obtain finely dispersed mixing
Solution；Then the solution of gained is placed in the spray gun in the glove box full of nitrogen, mixed solution is then sprayed at alcohol
On clean aluminium foil, the thickness of mixing material is set to be maintained at 3 μm, finally by the aluminium foil after spraying in vacuum drying chamber, 60 DEG C
Lower dry 12h.
Step 2, the preparation of positive pole scraping coating is identical with case one.
By the ferroelectric material lead titanates (PbTiO after grinding3) be scattered in NMP, make PbTiO3Concentration be 4mg/ml, stir
0.5h and ultrasound 0.5h are mixed, finely dispersed PbTiO is obtained3Solution, is then placed in the gloves full of nitrogen by the solution of gained
In spray gun in case, then by PbTiO3The positive electrode surface of blade coating is sprayed at, makes PbTiO3The thickness of layer is maintained at 5 μm, finally will
Anode pole piece after spraying dries 12h, obtains final lithium-sulphur cell positive electrode in vacuum drying chamber at 60 DEG C.
Positive pole is assembled into battery, after being circulated under 0.2C discharge rates through 100 times, its reversible specific capacity is 598mAh/
G, capability retention is 71%.
Although the solution of the present invention is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.With reference to the elaboration of above inventive concept, those skilled in the art should can
The claims of the clear and definite present invention.
Claims (7)
1. a kind of lithium-sulfur cell anode composite, it is characterised in that mainly constituted by three layers：First layer is ferroelectric material and graphene
Mixing sprayed coating, thickness be 0.2 μm -5 μm；The second layer is carbon/sulphur slurry scraping coating, and thickness is 150 μm -250 μm, wherein adopting
The mass ratio of nano-sulfur and conductive black is 7:2；Third layer is ferroelectric material sprayed coating, and thickness is 0.4 μm -10 μm.
2. lithium-sulfur cell anode composite according to claim 1, it is characterised in that：The ferroelectric material and third layer of first layer
Ferroelectric material be selected from PbTiO3、BaTiO3、SrTiO3、LiNbO3、KNbO3、Cd2Nd2O7And PZT.
3. the preparation method of lithium-sulfur cell anode composite described in claim 1, it is characterised in that comprise the following steps：
Step 1) ferroelectric material and graphene mixing sprayed coating preparation
Disperse graphene in 1-METHYLPYRROLIDONE, make the concentration of graphene for 1mg/ml-3mg/ml, iron is added after ultrasound
Electric material, makes the concentration of ferroelectric material for 0.5mg/ml-3mg/ml, after stirring, ultrasound, obtains finely dispersed mixed solution；
Then mixed solution is sprayed on clean aluminium foil, the thickness of sprayed on material is maintained at 0.2 μm -5 μm, after finally spraying
Aluminium foil under vacuum environment dry, it is standby；
Step 2) carbon/sulphur slurry scraping coating preparation
In mass ratio 7:2:1 weighs nano-sulfur, conductive black, Kynoar respectively, and respectively at grinding in mortar；Will be poly- inclined
PVF is added in appropriate solvent, magnetic agitation；Then, the nano-sulfur particles for adding grinding are stirred again, and ultrasound, most
Add the slurry that composite positive pole is obtained after conductive black and supplementing solvent, magnetic agitation afterwards, solvent institute in the slurry
Mass fraction is accounted for for 2-4%；The slurry of composite positive pole is scratched to the step 1 cleaned in alcohol with scraper) after the spraying
Aluminium foil on, the electrode of 150 μm of -250 μ m-thick is made, positive pole scraping coating is dried to obtain under vacuum conditions, it is standby；
Or, in mass ratio 7:2:1 weighs nano-sulfur, conductive black, Kynoar respectively, by the material mixing weighed to grinding
Ground in alms bowl, obtain well mixed positive electrode；Then, in a nitrogen environment normal temperature to 100~110 DEG C with 1 DEG C/min's
Speed heats up, and then 155 DEG C~200 DEG C is warming up to 0.5 DEG C/min speed, finally in this temperature 6h~24h；Treat material
Obtained after material cooling and be combined uniform anode composite material；Composite positive pole is added in appropriate solvent, after magnetic agitation
The slurry of composite positive pole is obtained, shared mass fraction is 2-4% to the solvent in the slurry；By the slurry of composite positive pole
Material scratches the step 1 cleaned in alcohol with scraper) on aluminium foil after the spraying, the electrode of 150 μm of -250 μ m-thick is made, true
Positive pole scraping coating is dried to obtain under Altitude, it is standby；
Step 3) ferroelectric material sprayed coating preparation
Ferroelectric material particle after grinding is scattered in 1-METHYLPYRROLIDONE, the concentration for making ferroelectric material is 1mg/ml-
5mg/ml, stirs and ultrasound, finely dispersed ferroelectric material solution is obtained, then by the ferroelectric material solution spraying of gained in step
The rapid positive pole blade coating layer surface 2) obtained, makes the thickness of ferroelectric material sprayed coating be maintained at 0.4 μm -10 μm, after finally spraying
Anode pole piece under vacuum environment dry, obtain final lithium-sulfur cell anode composite.
4. preparation method according to claim 3, it is characterised in that：Step 1) in spraying mixed solution be specifically by gained
Mixed solution is placed in the spray gun in the glove box full of nitrogen and then sprayed.
5. preparation method according to claim 3, it is characterised in that：Step 2) second scheme in, obtained in grinding
After well mixed positive electrode, it is that mixing material is put into water heating kettle in the glove box full of nitrogen, water heating kettle is turned
Move in the tube furnace filled with nitrogen, then carry out heating link.
6. preparation method according to claim 3, it is characterised in that：Step 3) middle spraying ferroelectric material solution specifically general
The ferroelectric material solution of gained is placed in the spray gun in the glove box full of nitrogen and then sprayed.
7. preparation method according to claim 3, it is characterised in that：Step 2) described in solvent use N- crassitudes
Ketone.
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| CN108493414A (en) * | 2018-03-20 | 2018-09-04 | 吉林师范大学 | A kind of lithium sulfur battery anode material and preparation method thereof |
| CN110247039A (en) * | 2019-06-17 | 2019-09-17 | 启东启澳新材料科技发展有限公司 | A kind of nickel lithium manganate cathode material preparation method coating strontium titanate base conductive coating |
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