CN108365183A - Ternary material with surface coated with aluminum oxide and preparation method thereof - Google Patents
Ternary material with surface coated with aluminum oxide and preparation method thereof Download PDFInfo
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- CN108365183A CN108365183A CN201810001206.4A CN201810001206A CN108365183A CN 108365183 A CN108365183 A CN 108365183A CN 201810001206 A CN201810001206 A CN 201810001206A CN 108365183 A CN108365183 A CN 108365183A
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Abstract
The invention relates to a ternary material with an aluminum oxide coated surface and a preparation method thereof, wherein the preparation method comprises the following steps: mixing alkaline ternary precursor slurry and an aluminum salt solution for reaction, then carrying out aging and solid-liquid separation to obtain a ternary precursor with the surface coated with aluminum hydroxide, then mixing the ternary precursor with the surface coated with the aluminum hydroxide with a lithium source, sintering the mixed material, and obtaining the ternary material with the surface coated with the aluminum oxide after sintering. The preparation method has the advantages of simple process, low energy consumption, low equipment investment cost, high production efficiency and good coating effect, and the prepared ternary material is uniformly coated with the compact alumina layer on the surface and has high structural stability and high reliability of charge and discharge performance.
Description
Technical field
The present invention relates to the technical fields of anode material of lithium battery, more particularly to a kind of ternary of surface-coated aluminum oxide
Material and preparation method thereof.
Background technology
Anode material for lithium-ion batteries is widely used in such as power battery, tool batteries, polymer battery, cylindrical battery, aluminium
The power-supply devices such as housing battery.Wherein, nickle cobalt lithium manganate with relatively inexpensive nickel and manganese instead of in cobalt acid lithium 2/3rds or more
Cobalt, advantage is clearly compared with other lithium cell anode material lithium manganates, LiFePO 4 in terms of cost, nickel cobalt
Lithium manganate material is very close in terms of chemical property and processing performance with cobalt acid lithium so that nickel-cobalt lithium manganate material becomes new
Battery material and gradually replace cobalt acid lithium, become the favorite of lithium battery tertiary material of new generation.
In the ternary materials surface-coated aluminum oxide such as nickle cobalt lithium manganate, the structural stability of material can be improved.Currently, existing
The method of ternary material surface-coated aluminum oxide is coated to ternary material finished product, is broadly divided into two kinds, and one is will
Ternary material after sintering crystallization is added in liquid phase coating agent, makes coating particles and ternary material emulsion dispersion, using dry
It is dry, the ternary material of surface-coated aluminum oxide is obtained after double sintering；Another kind is being sintered by liquid phase surface diposition
Ternary material surface-coated aluminum oxide layer after crystallization, is then separated by solid-liquid separation, then by solid-phase material double sintering, obtains surface packet
Cover the ternary material of aluminium oxide.
However, above-mentioned existing two kinds of method for coating all have following defect：
1) technological process length, equipment investment height, high energy consumption, efficiency are low, and dry and double sintering needs to consume a large amount of heat
Can, cost is higher；
2) to reach more uniform precipitation covered effect, then the longer cladding time is needed, condition controls in technique
More difficult, the stability of product batches is poor；
3) cladding dispersant generally selects alcohol system dispersant or water, but since alcohol system dispersant cost is higher, and the rate of recovery
It is relatively low, cause cost higher, and ternary material is more sensitive to moisture, especially high-nickel material, in water, partial cation meeting
Hydrolysis occurs to destroy, so that material granule surface microstructure is lost intrinsic layer structure, electrical property is caused to reduce, and this destruction is not
It is reversible, it is difficult to make its recovery by later-stage secondary sintering.
Invention content
Based on this, the object of the present invention is to provide a kind of preparation method of the ternary material of surface-coated aluminum oxide,
Have the advantages that simple for process, low energy consumption, equipment investment cost is low, production efficiency is high, covered effect is good.
The technical solution adopted by the present invention is as follows：
A kind of preparation method of the ternary material of surface-coated aluminum oxide, includes the following steps：
It by the ternary precursor slurry of alkalinity and aluminum salt solution hybrid reaction, then is aged, is separated by solid-liquid separation, obtain surface
Then the ternary precursor of cladded aluminium hydroxide mixes the ternary precursor of surface cladded aluminium hydroxide with lithium source, then will mix
Material sintering is closed, the ternary material of surface-coated aluminum oxide is obtained after sintering.
Relative to the existing method to ternary material finished product coated aluminum oxide, the present invention on ternary precursor surface by wrapping
Aluminium hydroxide is covered, then mixes with lithium source and to carry out once sintered, the ternary material of surface-coated aluminum oxide is obtained, eliminates existing packet
The drying process and double sintering process of coating method shorten technological process, and cladding process control is relatively simple, greatlys save
Equipment investment cost and energy consumption cost, improve production efficiency.
Moreover, it is existing uncoated ternary material is added to disperse in liquid phase coating agent after dry, calcining coated
In the coating technology of material, it is difficult to coating is equably coated on by material surface by emulsion dispersion, and in the drying process
It is difficult to avoid ternary material and coating Al2O3Separation, lead to the Al on ternary material surface2O3Clad is uneven.And this hair
It is bright by coated with uniform Al (OH)3Ternary precursor mixed with lithium source once sintered, part Al is spread by high temperature sintering
Into material surface crystal grain, formation contains one layer of uniform and fine and close Al2O3Clad, and particle surface layer contains one layer with Al
The grade doping material of the solid solution layer of doping concentration gradient can effectively reduce ternary material surface in battery charge and discharge process
With the direct contact area of electrolyte, the generation of side reaction is reduced, relatively thin SEI films is formed, consumes less Li+, the table of Al
Layer grade doping can stabilizing material structure, comprehensive two aspect useful improvements significantly improve the thermodynamic stability of ternary material, follow
Ring stability and security performance.By being tested for the property discovery to ternary material produced by the present invention, above-mentioned advantageous effect is aobvious
It writes.
Further, the ternary precursor slurry of alkalinity is squeezed into aluminum salt solution in a reacting pipe simultaneously and is mixed
It closes, hydroxide ion therein reacts with aluminium ion, generates the aluminum hydroxide layer for being covered in ternary precursor surface；
The both ends of the reacting pipe are respectively equipped with slurry import and slurry outlet, and tube wall offers multiple feed inlets,
Polylith baffle is provided in pipe；Ternary precursor slurry is entered from the slurry import in reacting pipe, and aluminum salt solution is from institute
It states multiple feed inlets and enters in reacting pipe and mixed with ternary precursor slurry, the slurry after hybrid reaction goes out from the slurry
Mouth discharge.
It completes to prepare Al (OH) on ternary precursor surface using the reacting pipe3The step of clad, reacting pipe
Equipment manufacturing cost it is at low cost, be easy assembling, three mixing, reaction, transported material processes can be merged within one device
It efficiently completes, substantially increases production efficiency, and the multiple feed inlets and baffle of the reacting pipe can control the flow direction of slurry, have
Conducive to uniform mixing and fully reaction.
Further, the reacting pipe offers the 10-20 equally distributed feed inlet in interval altogether, and the baffle is fan
Shape baffle.The overall structure of the reacting pipe can make ternary precursor slurry and aluminum salt solution inside it fully dispersion,
Mixing, convenient for the effectively progress of control reaction and control Al (OH)3The thickness of clad layer-forming is conducive to ternary precursor surface
Form uniform Al (OH)3Clad.
Further, following steps are specifically included：
(1) it is 5-9 according to the molar ratio of nickel, cobalt, manganese:1-4:Nickel, cobalt, the soluble-salt of manganese and water are configured to gold by 0-3
It is spare to belong to the mixing salt solution that total ion concentration is 1-2mol/L, it is standby for the sodium hydroxide solution of 12-32% to prepare mass concentration
With, prepare mass concentration be 20-30% ammonia spirit it is spare, by aluminum sulfate, aluminum nitrate or aluminium chloride and water be configured to aluminium from
The aluminum salt solution of a concentration of 0.2-1mol/L of son is spare；
(2) mixing salt solution, ammonium hydroxide and sodium hydroxide solution are added in reaction kettle and are stirred to react, control reaction system
PH value is 10.5-12, and reaction temperature is 45-65 DEG C, and nitrogen is passed through in reaction kettle, and the ternary precursor slurry of alkalinity is obtained after reaction
Material；
(3) the ternary precursor slurry of alkalinity is pumped into reacting pipe simultaneously with aluminum salt solution and is mixed, fully after reaction,
Gained slurry is aged 1-3 hours, is less than 8 with pure water to washings pH value after ageing, then is dried to obtain surface cladding
The ternary precursor of aluminium hydroxide；
(4) it is 1 according to the molar ratio of nickel, cobalt, the total amount of manganese and lithium:1-1.05, by the ternary of surface cladded aluminium hydroxide
Presoma is mixed with lithium source, then mixed material is sent into sintering furnace and is sintered, and is passed through oxygen in stove when sintering；
(5) it will be sintered resulting material Mechanical Crushing, using sieve, magnetic is removed, obtain the ternary material of surface-coated aluminum oxide.
Further, step (2) is specially：2000-3000L mixing salt solution conducts are first added in 5 cubes of reaction kettles
Bottom liquid, then it is continuously added into the mixing salt solution that flow is 300-400L/h, and adjusted by the way that ammonium hydroxide and sodium hydroxide solution is added
The pH value of reaction system maintains 10.5-12, controls the ammonia molecule (NH in reaction system3) total content be 6-12g/L, hydrogen
The content of oxygen radical ion is 1-3g/L, and reaction temperature is controlled at 45-65 DEG C, and the ternary precursor slurry of reaction gained alkalinity is from anti-
It answers and is collected in kettle overflow a to aging reactor.
Further, in step (2), the speed of agitator control in reaction kettle adjusts reaction kettle entoplasm in 180-260rpm
The granularity of material reaches 9-13 μm.
Further, step (3) is specially：The ternary precursor slurry of alkalinity is pumped into reacting pipe from slurry import
In, while aluminum salt solution being pumped into from multiple feed inlets in reacting pipe and is mixed with ternary precursor slurry, in each feed inlet
The flow of aluminum salt solution is equal, and fully after reaction, gained slurry is discharged into from the slurry outlet of reacting pipe in an aging reactor, ageing
Slurry washing to washings pH value is less than 8, then dewatered and washed point using centrifuge pure water after 2 hours, dewatered material is sent
Enter in dryer and dry, obtains the ternary precursor of surface cladded aluminium hydroxide.
Further, in step (3), flow of the ternary precursor slurry in reacting pipe is 300-600L/h, each
The flow of aluminum salt solution is 0.5-2L/h in feed inlet.
Further, described to be sintered in step (4)：3-5 hours first are kept the temperature with 400-600 DEG C, then with 700-950 DEG C
Heat preservation 8-14 hours.
The present invention also provides the ternary materials of surface-coated aluminum oxide made from preparation method described in any one of the above embodiments.
In order to better understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Description of the drawings
Fig. 1 is the structural schematic diagram of reacting pipe；
Fig. 2 is the structural schematic diagram of sub-pipes；
Fig. 3 be Fig. 2 in A to schematic diagram；
Fig. 4 is the microscopic appearance figure of 1 gained ternary material of embodiment；
Fig. 5 is the energy-spectrum scanning figure of the nickel element and aluminium element on 1 gained ternary material surface of embodiment；
Fig. 6 is the microscopic appearance figure of 1 gained ternary material of comparative example.
Specific implementation mode
The preparation method of the ternary material of the surface-coated aluminum oxide of the present invention includes the following steps：
The ternary precursor slurry of alkalinity is squeezed into a reacting pipe with aluminum salt solution simultaneously and carries out hybrid reaction, then is carried out
Ageing is separated by solid-liquid separation, and obtains the ternary precursor of surface cladded aluminium hydroxide, then will be before the ternary of surface cladded aluminium hydroxide
It drives body to mix with lithium source, then mixed material is sintered, the ternary material of surface-coated aluminum oxide is obtained after sintering.
The structural schematic diagram that -3, Fig. 1 is reacting pipe is please referred to Fig.1, Fig. 2 is the structural schematic diagram of sub-pipes, and Fig. 3 is figure
In 2 A to schematic diagram.
The reacting pipe is made up of 10-20 cross-talks pipeline 12 assembled in series of ring flange, specifically by 20 cross-talks
Pipeline 1 is connected in series, and both ends are respectively equipped with slurry import 3 and slurry outlet 4.
A feed inlet 10 is offered per the tube wall at 1 middle part of cross-talk pipeline, then the reacting pipe is provided with 20 intervals altogether
Equally distributed feed inlet 10.The feed inlet 10 is connect with a feed pipe 11, and the son is stretched into one end of the feed pipe 11
In pipeline 1, the other end stretches out outside the sub-pipes 1.
5 pieces of fan shape baffles 12 are internally provided with per cross-talk pipeline 1,5 pieces of fan shape baffles 12 are along the length side of sub-pipes 1
It is uniformly distributed to interval.The arc side of every piece of fan shape baffle 12 is affixed with merging with the top of 1 inner wall of sub-pipes or lower part.
The ternary precursor slurry of alkalinity is entered from the slurry import 3 in reacting pipe, and aluminum salt solution is from described more
A feed inlet 10 is entered in reacting pipe and is mixed with ternary precursor slurry, and the slurry after hybrid reaction is from the slurry outlet
4 discharges.
Embodiment 1
The present embodiment prepares the ternary material of surface-coated aluminum oxide, and steps are as follows：
(1) according to Ni:Co:Mn=6:2:Nickel, cobalt, the soluble-salt of manganese and water are configured to metal ion by 2 molar ratio
Total concentration is that the mixing salt solution of 1-2mol/L is spare, and the sodium hydroxide solution that preparation mass concentration is 24% is spare, prepares matter
Measure a concentration of 25% ammonia spirit it is spare, by aluminum sulfate, aluminum nitrate or aluminium chloride and water be configured to aluminium ion concentration be 0.2-
The aluminum salt solution of 1mol/L is spare.
(2) 2500L mixing salt solutions first are added the bottom of as in the closed synthesis reaction vessel of high efficiency (specification is 5 cubes)
Liquid, then be continuously added into flow and be the mixing salt solution of 360L/h, while ammonium hydroxide and sodium hydroxide solution is added, it carries out under stiring
Reaction.
The amount of ammonium hydroxide and sodium hydroxide solution is added by control and maintains 11.6 to adjust the pH value of reaction system, control
The content of ammonia molecule in reaction system is 8g/L, and the content of hydroxide ion is 2g/L, and reaction temperature control is 60 DEG C, instead
It is 220rpm to answer the speed of agitator in kettle to control, and nitrogen is passed through in reaction kettle.
As the granularity D of slurry in reaction kettle50When reaching 10 μm, the stirring finely tuned in the pH value and reaction kettle of reaction system turns
Speed, the granularity for controlling slurry in reaction kettle maintain 10-11 μm.
Above-mentioned reaction is successive reaction, after the completion of reaction, the ternary precursor slurry of gained alkalinity from reaction kettle overflow to
It is collected in first aging reactor.
(3) the ternary precursor slurry of the alkalinity in the first aging reactor is pumped into from slurry import in reacting pipe, simultaneously
Aluminum salt solution is pumped into from 20 feed inlets in reacting pipe respectively and is mixed with ternary precursor slurry, ternary precursor slurry exists
Flow in reacting pipe is 500L/h, and the flow of aluminum salt solution is 1L/h in each feed inlet.Mixed slurry in reacting pipe
In hydroxide ion react with aluminium ion, generate and be covered in the aluminum hydroxide layer on ternary precursor surface.
Fully after reaction, gained slurry is discharged into from the slurry outlet of reacting pipe in the second aging reactor, after being aged 2 hours,
According to 1 ton of solid material:The ratio of 11 tons of pure water, using centrifuge pure water by the slurry washing after ageing to washings pH value
Less than 8, then dewatered and washed point, dewatered material, which is sent into dryer, dries, and obtains the ternary forerunner of surface cladded aluminium hydroxide
Body.
(4) ternary precursor of surface cladded aluminium hydroxide is first crossed into 200 mesh sieve, according still further to (Ni+Co+Mn):Li=1:
Ternary precursor after sieving is added with lithium source in high speed mixer and mixes, then fills mixed material by 1.03 molar ratio
Enter in saggar, be re-fed into sintering furnace and be sintered, the keeping temprature curve of sintering is：4 hours first are kept the temperature with 400 DEG C, then is kept the temperature with 870 DEG C
12 hours, the oxygen of purity 95% is passed through when sintering in stove.
(5) it after being sintered resulting material natural cooling, is ground by Mechanical Crushing, after 300 mesh sieve, removes magnetic, obtain surface
The ternary material of coated aluminum oxide.
Fig. 4-5 is please referred to, Fig. 4 is the microscopic appearance figure of ternary material obtained by the present embodiment, and Fig. 5 is three obtained by the present embodiment
The energy-spectrum scanning figure of nickel (Ni) element and aluminium (Al) element that first material surface is obtained through material energy spectrometer analysis.
From fig. 4, it can be seen that ternary material particle surface obtained by the present embodiment is fine and close, illustrate uniform coated aluminum oxide layer.
After testing, aluminium (Al) content of ternary material obtained by the present embodiment is about 2800ppm.
Button cell is made in ternary material obtained by the present embodiment, electric performance test is carried out at test voltage 3-4.3V,
Test result is：Under 1C discharge-rates, the specific discharge capacity of the ternary material is 165mAh/g, 1C100 charge/discharge capacity
Conservation rate be 98%.
Comparative example 1
This comparative example prepares the ternary material of the uncoated aluminium oxide in surface, and steps are as follows：
(1) according to Ni:Co:Mn=6:2:Nickel, cobalt, the soluble-salt of manganese and water are configured to metal ion by 2 molar ratio
Total concentration is that the mixing salt solution of 1-2mol/L is spare, and the sodium hydroxide solution that preparation mass concentration is 24% is spare, prepares matter
Measure a concentration of 25% ammonia spirit it is spare.
(2) 2500L mixing salt solutions first are added the bottom of as in the closed synthesis reaction vessel of high efficiency (specification is 5 cubes)
Liquid, then be continuously added into flow and be the mixing salt solution of 360L/h, while ammonium hydroxide and sodium hydroxide solution is added, it carries out under stiring
Reaction.
The amount of ammonium hydroxide and sodium hydroxide solution is added by control and maintains 11.6 to adjust the pH value of reaction system, control
The total content of ammonia molecule in reaction system is 8g/L, and the content of hydroxide ion is 2g/L, and reaction temperature control is 60 DEG C,
Speed of agitator control in reaction kettle is 220rpm, and nitrogen is passed through in reaction kettle.
As the granularity D of slurry in reaction kettle50When reaching 10 μm, the stirring finely tuned in the pH value and reaction kettle of reaction system turns
Speed, the granularity for controlling slurry in reaction kettle maintain 10-11 μm.
Above-mentioned reaction is successive reaction, and after the completion of reaction, gained ternary precursor slurry is from reaction kettle overflow to aging reactor
Then interior collection carries out ageing 2 hours.According still further to 1 ton of solid material:The ratio of 11 tons of pure water, will with pure water using centrifuge
Slurry washing to washings pH value after ageing is less than 8, then dewatered and washed point, and dewatered material, which is sent into dryer, dries, and obtains
To ternary precursor.
(3) ternary precursor is first crossed into 200 mesh sieve, according still further to (Ni+Co+Mn):Li=1:1.03 molar ratio will be sieved
Ternary precursor afterwards is added in high speed mixer with lithium source and mixes, and then mixed material is fitted into saggar, is re-fed into sintering
It is sintered in stove, the keeping temprature curve of sintering is：4 hours first are kept the temperature with 400 DEG C, then 12 hours are kept the temperature with 870 DEG C, is led in stove when sintering
Enter the oxygen of purity 95%.
(4) it after being sintered resulting material natural cooling, is ground by Mechanical Crushing, after 300 mesh sieve, removes magnetic, obtain surface
The ternary material of uncoated aluminium oxide.
Referring to Fig. 6, Fig. 6 is the microscopic appearance figure of ternary material obtained by this comparative example.
It may be seen that the uncoated alumina layer of ternary material particle surface obtained by this comparative example, more loose, coarse.
Button cell is made in ternary material obtained by this comparative example, electric performance test is carried out at test voltage 3-4.3V,
Test result is：Under 1C discharge-rates, the specific discharge capacity of the ternary material is 165mAh/g, 1C100 charge/discharge capacity
Conservation rate be 92%.
Comparing embodiment 1 is with 1 gained ternary material of comparative example it is found that the ternary of surface-coated aluminum oxide prepared by the present invention
The structural stability higher of material, charge-discharge performance reliability, cyclical stability and security performance higher.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.
Claims (10)
1. a kind of preparation method of the ternary material of surface-coated aluminum oxide, it is characterised in that：Include the following steps：
It by the ternary precursor slurry of alkalinity and aluminum salt solution hybrid reaction, then is aged, is separated by solid-liquid separation, obtain surface cladding
Then the ternary precursor of aluminium hydroxide mixes the ternary precursor of surface cladded aluminium hydroxide with lithium source, then by mixture
Material sintering, obtains the ternary material of surface-coated aluminum oxide after sintering.
2. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 1, it is characterised in that：
The ternary precursor slurry of alkalinity is squeezed into aluminum salt solution in a reacting pipe simultaneously and is mixed, hydroxyl therein
Ion reacts with aluminium ion, generates the aluminum hydroxide layer for being covered in ternary precursor surface；
The both ends of the reacting pipe are respectively equipped with slurry import and slurry outlet, and tube wall offers multiple feed inlets, in pipe
It is provided with polylith baffle；Ternary precursor slurry is entered from the slurry import in reacting pipe, and aluminum salt solution is from described more
A feed inlet is entered in reacting pipe and is mixed with ternary precursor slurry, and the slurry after hybrid reaction is arranged from the slurry outlet
Go out.
3. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 2, it is characterised in that：It is described anti-
Pipeline is answered to offer the 10-20 equally distributed feed inlet in interval altogether, the baffle is fan shape baffle.
4. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 3, it is characterised in that：Specific packet
Include following steps：
(1) it is 5-9 according to the molar ratio of nickel, cobalt, manganese:1-4:0-3, by nickel, cobalt, the soluble-salt of manganese and water be configured to metal from
Sub- total concentration is that the mixing salt solution of 1-2mol/L is spare, and the sodium hydroxide solution that preparation mass concentration is 12-32% is spare, matches
Mass concentration processed is that the ammonia spirit of 20-30% is spare, and aluminum sulfate, aluminum nitrate or aluminium chloride and water are configured to aluminium ion concentration
It is spare for the aluminum salt solution of 0.2-1mol/L；
(2) mixing salt solution, ammonium hydroxide and sodium hydroxide solution are added in reaction kettle and are stirred to react, control the pH value of reaction system
For 10.5-12, reaction temperature is 45-65 DEG C, is passed through nitrogen in reaction kettle, the ternary precursor slurry of alkalinity is obtained after reaction；
(3) the ternary precursor slurry of alkalinity is pumped into reacting pipe simultaneously with aluminum salt solution and is mixed, fully after reaction, gained
Slurry is aged 1-3 hours, is less than 8 with pure water to washings pH value after ageing, then is dried to obtain surface cladding hydrogen-oxygen
Change the ternary precursor of aluminium；
(4) it is 1 according to the molar ratio of nickel, cobalt, the total amount of manganese and lithium:1-1.05, by the ternary forerunner of surface cladded aluminium hydroxide
Body is mixed with lithium source, then mixed material is sent into sintering furnace and is sintered, and is passed through oxygen in stove when sintering；
(5) it will be sintered resulting material Mechanical Crushing, using sieve, magnetic is removed, obtain the ternary material of surface-coated aluminum oxide.
5. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 4, it is characterised in that：Step
(2) it is specially：2000-3000L mixing salt solutions are first added in 5 cubes of reaction kettles as bottom liquid, then is continuously added into flow and is
The mixing salt solution of 300-400L/h, and the pH value by the way that ammonium hydroxide and sodium hydroxide solution adjusting reaction system is added maintains
10.5-12, the total content for controlling the ammonia molecule in reaction system are 6-12g/L, and the content of hydroxide ion is 1-3g/L, instead
Answer temperature control at 45-65 DEG C, the ternary precursor slurry of reaction gained alkalinity is collected in from reaction kettle overflow to an aging reactor.
6. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 5, it is characterised in that：Step
(2) in, for the speed of agitator control in reaction kettle in 180-260rpm, the granularity for adjusting slurry in reaction kettle reaches 9-13 μm.
7. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 4, it is characterised in that：Step
(3) it is specially：The ternary precursor slurry of alkalinity is pumped into from slurry import in reacting pipe, while by aluminum salt solution from multiple
Feed inlet is pumped into reacting pipe to be mixed with ternary precursor slurry, and the flow of aluminum salt solution is equal in each feed inlet, fully
After reaction, gained slurry is discharged into from the slurry outlet of reacting pipe in an aging reactor, and ageing uses centrifuge pure water after 2 hours
Slurry washing to washings pH value is less than 8, then dewatered and washed point, dewatered material, which is sent into dryer, dries, and obtains surface
The ternary precursor of cladded aluminium hydroxide.
8. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 7, it is characterised in that：Step
(3) in, flow of the ternary precursor slurry in reacting pipe is 300-600L/h, the flow of aluminum salt solution in each feed inlet
For 0.5-2L/h.
9. the preparation method of the ternary material of surface-coated aluminum oxide according to claim 4, it is characterised in that：Step
(4) described to be sintered in：3-5 hours first are kept the temperature with 400-600 DEG C, then 8-14 hours are kept the temperature with 700-950 DEG C.
10. the ternary material of surface-coated aluminum oxide made from claim 1-9 any one of them preparation methods.
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