CN109516782A - Lithium battery ceramic diaphragm easy dispersed alumina and preparation method thereof - Google Patents
Lithium battery ceramic diaphragm easy dispersed alumina and preparation method thereof Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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Abstract
Present invention relates particularly to a kind of lithium battery ceramic diaphragm easy dispersed aluminas and preparation method thereof.The dispersing agent that the aluminium oxide and mass fraction that the lithium battery ceramic diaphragm is 99.4%~99.7% by mass fraction with easy dispersed alumina are 0.3%~0.6% forms；Al in the aluminium oxide2O3Content be 99.0%~99.9%, particle diameter distribution D50Partial size is 0.8~1.2 μm, and meets D10>=0.3 μm, D90≤ 3 μm, D99≤8μm；The ratio that magnetisable material accounts for its total weight in the aluminium oxide is less than 1ppm.The present invention also provides the preparation methods of easy dispersed alumina, the preparation method is simple, the purity of raw material Alpha-alumina is low, with certain cost advantage, preparing resulting aluminium oxide has the characteristics that low magnetisable material content, moderate in grain size, particle size distribution are narrow, specific surface area is moderate, it is modified to be dispersed agent, there is good dispersion performance in use, the preparation and coating for being more advantageous to slurry before ceramic diaphragm coats use.
Description
Technical field
Present invention relates particularly to a kind of lithium battery ceramic diaphragm easy dispersed aluminas and preparation method thereof.
Background technique
In recent years due to the appearance of energy consumption and problem of environmental pollution, high capacity lithium ion battery has been used as major impetus
Power supply and be widely used on pure battery and hybrid vehicle, and will be obtained in terms of artificial satellite, aerospace and energy storage
Using.
According to " energy conservation with new-energy automobile Technology Roadmap " of the publication of Chinese automobile Engineering society, pure electric vehicle and plug-in
Hybrid electric vehicle, the year two thousand thirty new-energy automobile ownership are greater than 80,000,000, and current year new-energy automobile sales volume station automobile is always sold
The 40%~50% of the amount of selling.As new-energy automobile sales volume increases, Vehicular battery also obtains rapid growth as kernel component.
Lithium battery diaphragm is the important set for constituting lithium ion battery together with electrolyte, positive electrode, negative electrode material
At part.
Currently used battery diaphragm is mostly polypropylene (PP) and polyethylene (PE) microporous barrier, the thermal contraction of high temperature lower diaphragm plate
Cause positive/negative plate to contact, the rapid heat release in part is brought, so that huge security risk.Polyolefins diaphragm is to polarity simultaneously
The wellability of electrolyte is poor, ionic conductivity, puncture resistance are poor, these defects have become lithium battery high performance process
In the difficulty that urgently overcomes.
Lithium battery diaphragm is the thermal stability for improving diaphragm first after ceramic coated, is protected in 180 DEG C of bodies of high temperature
It holds still well, avoidable diaphragm retracts cause internal short-circuit, are obviously improved battery security；Followed by improve diaphragm pair
The wellability of electrolyte is conducive to internal resistance of cell reduction, discharge power is promoted；Having again is exactly to prevent or reduce Membrane Oxygenation, is had
Operation and extension battery cycle life conducive to cooperation high-voltage anode.Aluminium oxide ceramics powder has as a kind of inorganic matter
Very high thermal stability and chemical inertness are the fine selections of battery diaphragm ceramic coating.It is handled by special process and matrix
Bonding is close.Significantly improve the high temperature resistance and safety of lithium ion battery.Ceramic coated special type diaphragm is especially suitable for dynamic
Power battery.
Current target focuses primarily upon the safety and ionic conductivity for promoting diaphragm.The promotion of safety, mainly according to
Rely the raising in thermal stability, and the raising of ionic conductivity can lead to then dependent on promotion of the diaphragm to electrolyte wettability
Modified surface is crossed, coating, new material system is developed, is realized using modes such as new processing technologys.
102522557 A of CN discloses a kind of system of easy dispersed alumina of high pure and ultra-fine applied to the sub- battery of lithium ion
Preparation Method.Its main feature is that: using the method that surface modification, physical treatment combine be prepared for be applied to lithium ion cell electrode or
Diaphragm coating, electrode material cladding the easy dispersed alumina of high pure and ultra-fine, with purity be 99.99% pure alpha-aluminum oxide based on
Raw material is wanted, the dispersing agent that addition accounts for high purity aluminium oxide quality 0.01-2.00% is surface modified, and is uniformly mixed；Then to this
Powder is crushed, and powder D is made50Reach 0.30-1.00 μm；Then it disperses smashed powder in deionized water, admittedly contain
10-50% is measured, is stirred evenly, 2h or more is stood, removes the bulky grain of bottom deposit, remaining slurry is dried in an oven, is obtained
To D50≤ 1.00 μm, specific surface area 4.0-8.0m2/ g, tap density 0.50-0.90g/cm3Superfine alumina powder.
This method is prepared using high purity aluminium oxide, is had the characteristics that at high cost；Addition dispersing agent progress surface is repaired in production process simultaneously
Decorations, are unfavorable for the control of dispersive agent ratio in subsequent product, and existing on subsequent applications influences.
105347778 A of CN discloses a kind of preparation method of lithium battery ceramic diaphragm high-purity ultra-fine alumina, described
Method is the following steps are included: 1) with A12O3Alpha-alumina of the content not less than 99.99% and solvent are that raw material is configured to contain admittedly
The slurries that amount is 20~60%, and be added and account for the surfactant that alpha-alumina powder quality ratio is 0.1%~2.5%,
It stirs evenly；2) by slurry abrasive to required granularity；3) grinding gained slurries are prepared into powder by spray drying；It 4) will spray
The dry gained powder of mist obtains D by air-flow crushing50≤ 0.8 μm, specific surface area 3.9-8.0m2/ g, purity >=99.99%,
Epigranular, the high-purity superfine alumina powder of favorable dispersibility.This method is prepared using high purity aluminium oxide, has spy at high cost
Point；Addition dispersing agent is surface modified in production process simultaneously, is unfavorable for the control of dispersive agent ratio in subsequent product, to rear
There is influence in continuous application.
105417562 A of CN discloses a kind of preparation method of hydro-thermal method synthesis Alpha-alumina.The present invention uses hydro-thermal
Method, and crystal seed a-Al is added into the hydroxide sol of product aluminium2O3, high in reaction kettle high temperature first with hydro-thermal reaction
Mainly obtain that partial size is small, and particle diameter distribution is narrow under pressure ring border, the high γ-AlOOH powder of sintering activity.Again by being lower than a-Al2O3Phase
The calcination temperature (800~1150 DEG C) that 1200 DEG C of temperature finally synthesizes a-Al2O3.The a-Al of synthesis2O3Particle dispersion is high,
Particle diameter distribution is narrow, and specific surface is 1~20m2/ g, average grain diameter are up to 99.99% in 350~500nm, purity.This method uses
High purity aluminium oxide preparation, has the characteristics that at high cost；Using hydro-thermal reaction, prepares, have under reaction kettle high temperature and high pressure environment
Complex process, it is at high cost.
106747358 A of CN discloses the preparation method for the series of oxidation aluminium superfines that purity is 5N.By quality percentage
Number is dispersed in the aqueous solution of alcohol for 99.99% or more Alpha-alumina, obtains the mixing containing little particle Alpha-alumina and alcohol
Supernatant, then be sufficiently mixed with the aqueous solution of alcohol, hydrolysis is carried out after alcohol aluminium salt is then added, obtains precursor particle；Again
It is dry after precursor particle is dried in vacuo, obtain the boehmite ceramic powders nano crystal of white soilless sticking；It finally will be white
The boehmite ceramic powders nano crystal of soilless sticking is placed in tube furnace, after sintering ball milling again, obtains the aluminium oxide that purity is 5N
Superfines.This method uses high purity aluminium oxide, carries out hydrolysis after alcohol aluminium salt, has the characteristics of at high cost, complex process.
102856521 A of CN discloses the plate alpha-alumina for lithium battery.With size distribution 0.1~10
Plate Alpha-alumina in micron range coats resonable battery electrode or membrane surface as coating material.Plate Alpha-alumina
Length or it is wide be 3~20 the ratio between with thickness.This patent, which is proposed, does coating using plate Alpha-alumina, coats resonable battery electrode
Or membrane surface, but the preparation to plate Alpha-alumina, application effect etc. are not pointed out.
From the above, it can be seen that aluminium oxide used at present be high pure and ultra-fine, wherein the purity requirement 99.99% of aluminium oxide with
On, high purity aluminium oxide has the features such as at high cost, preparation process is complicated.Either hydro-thermal method, the reaction of aluminium alcoholates salt hydrolysis etc. have
There are complex process, feature at high cost.Although high-purity alpha-alumina powder is real in terms of the control of micro impurity element in recent years
Breakthrough is showed, but relatively poor there is also powder lot stability and the problems such as powder granularity distribution is wide and reunites.
Domestic current aluminium oxide is conventional products, is unable to satisfy new energy power vehicle lithium battery diaphragm aluminium oxide
Requirement.Therefore, the breakthrough of the key technology of alumina ceramic material is current urgent problem.In addition, various powders
Material, slurry etc. are inevitably mixed into the magnetic substance of the tool to differ in size in process of production, as iron rust, iron wire,
Screw, nut etc., and these magnetisable materials in battery use process have fatal side effect.As industrial technology problem,
Current product and technology does not relate to these magnetisable materials.
Meanwhile aluminium oxide is in use, needs to be configured to slurry, is coated on diaphragm by way of coating.Cause
Superfine powder has dopant, and during preparing slurry, suspended dispersed performance affects the performance of coating.And domestic
There are a certain distance in this aspect for alumina powder.
Summary of the invention
It is an object of the invention to overcome the above the deficiencies in the prior art, provide a kind of with suitable particle diameter, size distribution
And the easy dispersed alumina of the lithium battery diaphragm of specific surface area.
The technical solution adopted by the present invention to solve the technical problems is:
The easy dispersed alumina of lithium battery ceramic diaphragm, the easy dispersed alumina by mass fraction be 99.4%~
The dispersing agent that 99.7% aluminium oxide and mass fraction is 0.3%~0.6% forms；Al in the aluminium oxide2O3Content be
99.0%~99.9%, particle diameter distribution D50Partial size is 0.8~1.2 μm, and meets D10>=0.3 μm, D90≤ 3 μm, D99≤8μm；
The ratio that magnetisable material accounts for its gross mass in the aluminium oxide is less than 1ppm.
The partial size and granularity of aluminium oxide must be suitable for that the thickness of granularity ambassador's ceramic coating increases, although the leaching of electrolyte
Lubricant nature can be good, but is unable to satisfy the requirement of increasingly strict lithium battery thickness；Although granularity is small there is beautiful, extension equipment to make
The advantages of with the service life, but there are problems that blocking membrane pore size, the ceramic diaphragm imbibition water retainability after also resulting in coating
It reduces.Therefore aluminium oxide needs suitable partial size and size distribution.
The security performance that will affect battery of magnetisable material in aluminium oxide, therefore reduce and control the content of magnetisable material
Be it is extremely important, in aluminium oxide provided by the invention magnetisable material account for its total weight ratio be less than 1ppm.
Preferably, the specific surface area of the aluminium oxide is 5.5~7.5m2/g。
The specific surface area of aluminium oxide must be suitable for large specific surface area, and powder, which is easy the moisture absorption, leads to the ceramics after products application
The water content of diaphragm is exceeded, can deteriorate the security performance of battery, is unable to satisfy lithium battery use；Alumina ratio surface area is too small,
Then the coating equipment (such as gravure roll, cutter etc.) in application process is lost greatly, use cost is caused to rise.Therefore aluminium oxide needs
There is suitable specific surface area.
Preferably, the dispersing agent is one or more of polyacrylic acid, polyethylene glycol and N methyl pyrrolidone.
The content measuring mode of aluminium oxide of the present invention is the test method based on " GB/T24487 aluminium oxide ".
The particle size test method of aluminium oxide of the present invention, which refers to, to be measured with the laser particle analyzer of laser light scattering principle
Size distribution.
The present invention also provides the lithium battery ceramic diaphragm preparation method of easy dispersed alumina, tool includes the following steps:
S1, mashing grinding: raw material Alpha-alumina and water are mixed with beating, purified through magnetic separator, is controlled into slurry
Magnetisable material content in mass, accounts for total solids content in slurries and is less than 1ppm；
The magnetic separator is that fluid line removes chinaware, and CN206184597U or CN205995615U can be used and introduce
Fluid line iron remover, the magnetic field strength of filter pipeline iron remover is not less than 12000GS.
S2, it is ground up, sieved: being handled by slurry abrasive obtained in step S1 to required granularity, and through 500~550 mesh sievings
It is spare afterwards；
S3, dehydration and drying: by the slurry after being ground up, sieved in step S2, through plate compression, drying, be made aluminium oxide half at
Product；
S4, it is crushed: the aluminium oxide semi-finished product after drying in step S3 is prepared through air-flow crushing to 500 meshes are all crossed
Aluminium oxide finished product is obtained, it is spare；
S5, modification: resulting aluminium oxide finished product will be prepared in step S4 and dispersing agent is mixed in a certain ratio, be finally made
The easy dispersed alumina of lithium battery diaphragm of the present invention.
Preferably, the mass ratio of Alpha-alumina and water is 1:1~2.3 in the step S1.
Preferably, the grinding in the step S2 uses high-energy ball milling, powder activity can be greatly improved.
Preferably, drying temperature is 150~200 DEG C in the step S3, drying time is 20~30h.
Beneficial effects of the present invention are as follows:
Compared with prior art, the present invention prepares resulting aluminium oxide, has magnetisable material low, it is ensured that product is using
When safety；Moderate with meso-position radius grain, the features such as particle size distribution is narrow, surface area is moderate, meets lithium battery diaphragm painting
Cover the requirement for preparing ceramic diaphragm；Meanwhile the purity of raw material Alpha-alumina is low, has certain cost advantage.Finally, being dispersed
Agent is modified, has good dispersion performance in use, is more advantageous to the preparation and painting of slurry before ceramic diaphragm coats
Cover use.
Detailed description of the invention
Fig. 1 is the size distribution schematic diagram of 1 gained aluminium oxide of the embodiment of the present invention.
Fig. 2 is the XRD schematic diagram of 1 gained aluminium oxide of the embodiment of the present invention.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be further explained in detail.
Embodiment 1
S1, mashing grinding: being 99.5% by 1000kg content under agitation, specific surface area 4.5m2α-oxygen of/g
Change aluminium, which is added in 1000kg water, to be mixed with beating.Mixed slurry is via Magnetic Isolation made of the magnetized magnetic material of excitation
Device purification (magnetic field strength of filter pipeline iron remover is not less than 12000GS), control is to away magnetic substances in slurry content with quality
Meter, accounting for total solids content in slurries is 0.5ppm；
S2, it is ground up, sieved: by mashing in step S1 except the slurry after iron is ground to aluminum oxide grain size D through high-energy ball milling50
Partial size is 1.1 μm, and D10It is 0.55 μm, D90It is 2.69 μm, D99It is 6.61 μm.The vibration screening assembled using 500 mesh screens
It is spare after machine sieving；
S3, dehydration and drying: the slurry after being ground up, sieved in step S2 is dehydrated through plate compression, obtains aluminium oxide filter cake；It will
Aluminium oxide filter cake dry 25h in 180 DEG C of hot air circulation drying oven, the aluminium oxide semi-finished product after being made dry；
S4, be crushed: the aluminium oxide semi-finished product after will be dry in step S3 are crushed and roll into a ball because of caused by drying through air-flow crushing
Poly- particle, until being all prepared of the present invention by 500 mesh screens (i.e. without oversize after the sieving of 500 mesh screens)
Aluminium oxide finished product after drying, it is spare；
After tested, the granularity D of preparation gained aluminium oxide finished product50Partial size is 1.08 μm, and is met: D10It is 0.55 μm, D90For
2.59 μm, D99It is 6.51 μm.
After tested, the BET of aluminium oxide finished product is 5.5m2/g；Al in aluminium oxide finished product2O3Content 99.5%, magnetisable material
The ratio for accounting for aluminium oxide finished product gross mass is 0.5ppm.
Fig. 1 is the Laser particle-size distribution schematic diagram of 1 gained aluminium oxide of the embodiment of the present invention.
Fig. 2 is the XRD distribution schematic diagram of 1 gained aluminium oxide of the embodiment of the present invention.
S5, modification: 99.7 parts of alumina powder after will be dry in step S4 mix with 0.3 part of polyacrylic acid, finally make
Obtain the easy dispersed alumina of lithium battery diaphragm of the present invention.
Embodiment 2
S1, mashing grinding: being 99.1% by 1000kg content under agitation, specific surface area 6.4m2α-oxygen of/g
Change aluminium, which is added in 2300kg water, to be mixed with beating.Mixed slurry is via Magnetic Isolation made of the magnetized magnetic material of excitation
Device purification (magnetic field strength of filter pipeline iron remover is not less than 12000GS), control is to away magnetic substances in slurry content with quality
Meter, accounting for total solids content in slurries is 0.9ppm；
S2, it is ground up, sieved: by mashing in step S1 except the slurry after iron is ground to aluminum oxide grain size D through high-energy ball milling50
Partial size is 1.0 μm, and D10It is 0.55 μm, D90It is 2.59 μm, D99It is 5.7 μm.The vibration screening assembled using 500 mesh screens
It is spare after machine sieving；
S3, dehydration and drying: the slurry after being ground up, sieved in step S2 is dehydrated through plate compression, obtains aluminium oxide filter cake；It will
Aluminium oxide filter cake dry 20h in 200 DEG C of hot air circulation drying oven, the aluminium oxide semi-finished product after being made dry；
S4, be crushed: the aluminium oxide semi-finished product after will be dry in step S3 are crushed and roll into a ball because of caused by drying through air-flow crushing
Poly- particle, until being all prepared of the present invention by 500 mesh screens (i.e. without oversize after the sieving of 500 mesh screens)
Aluminium oxide finished product after drying, it is spare；
After tested, the granularity D of aluminium oxide finished product50Partial size is 0.98 μm, and is met: D10It is 0.55 μm, D90It is 2.57 μm,
D99It is 5.51 μm.
After tested, the BET of aluminium oxide finished product is 7.3m2/g；Al in aluminium oxide finished product2O3Content 99.1%, magnetisable material
The ratio for accounting for aluminium oxide finished product gross mass is 0.9ppm.
S5, modification: 99.4 parts of alumina powder after will be dry in step S4 mix with 0.6 part of polyethylene glycol, finally make
Obtain the easy dispersed alumina of lithium battery diaphragm of the present invention.
Embodiment 3
S1, mashing grinding: being 99.8% by 1000kg content under agitation, specific surface area 5.7m2α-oxygen of/g
Change aluminium, which is added in 1500kg water, to be mixed with beating.Mixed slurry is via Magnetic Isolation made of the magnetized magnetic material of excitation
Device purification (magnetic field strength of filter pipeline iron remover is not less than 12000GS), control is to away magnetic substances in slurry content with quality
Meter, accounting for total solids content in slurries is 0.1ppm；
S2, it is ground up, sieved: by mashing in step S1 except the slurry after iron is ground to aluminum oxide grain size D through high-energy ball milling50
Partial size is 0.82 μm, and D10It is 0.35 μm, D90It is 2.32 μm, D99It is 5.1 μm.The vibration screening assembled using 550 mesh screens
It is spare after machine sieving；
S3, dehydration and drying: the slurry after being ground up, sieved in step S2 is dehydrated through plate compression, obtains aluminium oxide filter cake；It will
Aluminium oxide filter cake dry 30h in 150 DEG C of hot air circulation drying oven, the aluminium oxide semi-finished product after being made dry；
S4, be crushed: the aluminium oxide semi-finished product after will be dry in step S3 are crushed and roll into a ball because of caused by drying through air-flow crushing
Poly- particle, until being all prepared of the present invention by 500 mesh screens (i.e. without oversize after the sieving of 500 mesh screens)
Aluminium oxide finished product after drying, it is spare；
After tested, the granularity D of aluminium oxide finished product50Partial size is 0.81 μm, and is met: D10It is 0.35 μm, D90It is 2.31 μm,
D99It is 5.08 μm.
After tested, the BET of aluminium oxide finished product is 6.8m2/g；Al in aluminium oxide finished product2O3Content 99.8%, magnetisable material
The ratio for accounting for aluminium oxide finished product gross mass is 0.1pm.
S5, modification: by 99.5 parts of the alumina powder and 0.2 part of polyethylene glycol and 0.3 part of N methyl after drying in step S4
Pyrrolidones mixing, is finally made lithium battery diaphragm of the present invention with easy dispersed alumina.
The application effect of Examples 1 to 3 is tested
The embodiment of the present invention 1~3 is prepared into resulting easy dispersed alumina, commercially other aluminium oxide, Examples 1 to 3
Raw material Alpha-alumina carries out diaphragm ceramic coated respectively and is tested for the property.Concrete operation step are as follows: slurry preparation first,
Slurry viscosity after preparation is 60cps, then solid content 42% carries out ceramic coated through light microgravure high speed coating machine, is applied
4 μm of thickness degree, coating speed 100m/min, through drying, winding and cutting after coating, being cut into length is 100mm, and width is
61.5mm ceramic diaphragm.Application effect comparison is carried out, is shown in Table 1.
1 application effect deck watch of table
In conclusion compared with prior art, the present invention prepares resulting aluminium oxide, have magnetisable material low, it is ensured that
The safety of product when in use；It is moderate with meso-position radius grain, the features such as particle size distribution is narrow, surface area is moderate, meet lithium
Battery diaphragm coating prepares the requirement of ceramic diaphragm；Meanwhile it is low to the purity requirement of raw material Alpha-alumina, there is certain cost
Advantage.Finally, dispersed agent is modified, there is good dispersion performance in use, is more advantageous to ceramic diaphragm coating
The preparation and coating of preceding slurry use.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (7)
1. the easy dispersed alumina of lithium battery ceramic diaphragm, which is characterized in that the easy dispersed alumina is by mass fraction
The dispersing agent that 99.4%~99.7% aluminium oxide and mass fraction is 0.3%~0.6% forms；Al in the aluminium oxide2O3's
Content is 99.0%~99.9%, particle diameter distribution D50Partial size is 0.8~1.2 μm, and meets D10>=0.3 μm, D90≤ 3 μm, D99
≤8μm；The ratio that magnetisable material accounts for its gross mass in the aluminium oxide is less than 1ppm.
2. the easy dispersed alumina of lithium battery ceramic diaphragm according to claim 1, which is characterized in that the ratio of the aluminium oxide
Surface area is 5.5~7.5m2/g。
3. the easy dispersed alumina of lithium battery ceramic diaphragm according to claim 1, which is characterized in that the dispersing agent is poly-
One or more of acrylic acid, polyethylene glycol and N methyl pyrrolidone.
4. the preparation method of the easy dispersed alumina of lithium battery ceramic diaphragm described in a kind of any one of claims 1 to 3,
It is characterized in that, tool includes the following steps:
S1, mashing grinding: raw material Alpha-alumina and water are mixed with beating, purified through magnetic separator, control is magnetic into slurry
Content of material in mass, accounts for total solids content in slurries and is less than 1ppm；
S2, it is ground up, sieved: by slurry abrasive obtained in step S1 to required granularity, and being sieved through 500~550 mesh and handle standby
With；
S3, dehydration and drying: aluminium oxide semi-finished product are made through filters pressing, drying in the slurry after being ground up, sieved in step S2；
S4, be crushed: the aluminium oxide semi-finished product after will be dry in step S3, to 500 meshes are all crossed, are prepared into oxygen through air-flow crushing
Change aluminium finished product, it is spare；
S5, modification: will prepare resulting aluminium oxide finished product and dispersing agent be mixed in a certain ratio in step S4, institute of the present invention is made
The easy dispersed alumina finished product of the lithium battery diaphragm stated.
5. the preparation method of the easy dispersed alumina of lithium battery ceramic diaphragm according to claim 4, which is characterized in that described
The mass ratio of Alpha-alumina and water is 1:1~2.3 in step S1.
6. the preparation method of the easy dispersed alumina of lithium battery ceramic diaphragm according to claim 4, which is characterized in that described
Grinding in step S2 uses high-energy ball milling.
7. the preparation method of the easy dispersed alumina of lithium battery ceramic diaphragm according to claim 4, which is characterized in that described
Drying temperature is 150~200 DEG C in step S3, and drying time is 20~30h.
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| CN112661496A (en) * | 2020-12-25 | 2021-04-16 | 淄博晨曜陶瓷科技有限公司 | Superfine inorganic powder for coating new energy lithium battery diaphragm |
| CN113307291A (en) * | 2021-06-15 | 2021-08-27 | 攀枝花学院 | Preparation method of ultrafine alpha-phase alumina powder |
| CN113698183A (en) * | 2021-08-27 | 2021-11-26 | 湖州南木纳米科技有限公司 | Carbon-coated alumina ceramic material and preparation method and application thereof |
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