CN114085069B - Lithium manganate cathode target material for preparing thin film lithium battery and preparation method thereof - Google Patents

Lithium manganate cathode target material for preparing thin film lithium battery and preparation method thereof Download PDF

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CN114085069B
CN114085069B CN202111361746.1A CN202111361746A CN114085069B CN 114085069 B CN114085069 B CN 114085069B CN 202111361746 A CN202111361746 A CN 202111361746A CN 114085069 B CN114085069 B CN 114085069B
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temperature
ball milling
temperature control
lithium
preset
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CN114085069A (en
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周钧
马贵龙
杨俊明
甘志俭
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ORDOS CITY OF CHINESE REDBUD INNOVATION INSTITUTE
Liuzhou Zijing Recycling Energy Technology Co ltd
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ORDOS CITY OF CHINESE REDBUD INNOVATION INSTITUTE
Liuzhou Zijing Recycling Energy Technology Co ltd
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Abstract

The invention provides a lithium manganate anode target material for preparing a thin film lithium battery and a preparation method thereof. The preparation method comprises the following steps: the method comprises the steps of premixing, ball milling, sieving, pressing, sintering and cooling. The lithium manganate anode target and the preparation method thereof can be specially suitable for the scheme of preparing the all-solid-state thin film lithium battery by adopting a magnetron sputtering coating mode, and solve the problem of no available suitable target in the process of preparing the all-solid-state thin film lithium battery by adopting the magnetron sputtering coating mode. Based on the lithium manganate cathode target material prepared by the method and the magnetron sputtering coating technology, the contact surface resistance of the prepared all-solid-state thin film lithium battery is obviously reduced, and the performance of the battery is obviously improved.

Description

Lithium manganate cathode target material for preparing thin film lithium battery and preparation method thereof
Technical Field
The invention relates to the field of large-scale energy storage and power energy, in particular to a lithium manganate anode target material for preparing a thin film lithium battery and a preparation method thereof.
Background
Lithium batteries include lithium ion batteries, have the characteristics of light weight, high specific energy and the like, and are gradually developed into the most competitive electrochemical power sources. The conventional lithium ion battery has liquid electrolyte, has the problems of easy leakage, easy corrosion, short service life, poor safety, low reliability and the like, and cannot completely meet the requirement of large-scale industrial energy storage on safety. The solid electrolyte is used to replace liquid electrolyte, so that the safety problem of the battery is effectively and thoroughly solved. In the face of the requirements of new energy storage, smart grid and the like, attention is paid to all-solid-state lithium batteries with high safety in recent years.
However, since the solid materials have certain rigidity and strength, when the battery is formed, the contact surfaces of different solid materials cannot be completely attached to each other without gaps, so that the contact surface resistance of the all-solid-state lithium battery is very high, and the performance of the battery is significantly reduced, which causes the energy density, specific energy, specific power, energy efficiency and energy conservation rate of the all-solid-state battery to be limited.
The inventor realizes that the problem of high contact surface resistance can be effectively solved by preparing the all-solid-state battery by adopting a magnetron sputtering coating mode, however, the magnetron sputtering coating mode needs a proper target material. How to prepare the cathode target becomes a technical problem to be solved urgently by the technical personnel in the field.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
Disclosure of Invention
An object of the present invention is to provide a lithium manganate cathode target material for preparing a thin film lithium battery and a preparation method thereof, which at least partially solve the above problems.
The invention further aims to provide a brand-new preparation method of the lithium manganate anode target, which is specially used for preparing an all-solid-state thin-film lithium battery by adopting a magnetron sputtering coating mode.
According to one aspect of the invention, a preparation method of a lithium manganate positive electrode target material for preparing a thin film lithium battery is provided, which comprises the following steps:
a premixing step, mixing lithium salt powder with manganese dioxide powder and manganese oxide powder according to a preset proportion to obtain premixed powder, wherein the lithium salt powder is selected from a substance group formed by lithium oxide, lithium carbonate and lithium nitrate;
a ball milling step, namely mixing premixed powder with zirconia balls with preset particle sizes in a ball milling tank, adding a dispersing agent, then carrying out ball milling according to a preset first rotating speed and a preset first time length, then carrying out ball milling according to a preset second rotating speed and a preset second time length, then adding a binding agent with a preset weight, and then carrying out ball milling according to a preset third rotating speed and a preset third time length to obtain synthetic powder;
a sieving step of sieving the synthetic powder;
a pressing step, namely vibrating and pressurizing the sieved synthetic powder, and then pressurizing by adopting a cold isostatic pressing mode to obtain a blank;
sintering, namely sintering the blank according to a preset temperature-raising program to obtain a sintered material, wherein the temperature-raising program comprises a plurality of groups of temperature-controlling temperatures and temperature-controlling durations which correspond to one another one by one, and each group of temperature-controlling temperatures and temperature-controlling durations is respectively and correspondingly provided with a suitable sintering atmosphere;
and a cooling step, cooling the sintered material to obtain the lithium manganate cathode target material.
Optionally, in the ball milling step, the zirconia balls have a particle size of 0.5mm to 6mm, a ratio of a total volume thereof to a volume of the ball milling tank is not more than one third, and a ratio of a total volume of the premixed powder and the zirconia balls to a volume of the ball milling tank is one half.
Optionally, in the ball milling step, the ball milling jar is made of a hard ceramic material.
Optionally, in the ball milling step, the weight of the dispersant is three thousandths of the total weight of the premixed powder.
Optionally, in the ball milling step, the first rotation speed is 40rpm to 70rpm, the first time period is 3 hours, the second rotation speed is 200rpm, and the second time period is more than 16 hours.
Optionally, in the ball milling step, the weight of the binder is one thousandth of the total weight of the premixed powder; and is provided with
The third speed was 55rpm for a third period of 10 hours.
Optionally, in the sieving step, a 500 mesh sieve is sieved.
Alternatively, 1500t is pressed during the shock pressing of the pressing step.
Optionally, during the pressing step by cold isostatic pressing, 300Mpa is pressurized and the pressure is maintained for 60min.
Optionally, in the sintering step, in order:
the first group of temperature control temperature and temperature control time of the temperature rise program are respectively 180 ℃ and 6h, and the corresponding sintering atmosphere is N 2 Ar (ratio 8 -3 Pa；
The second group of temperature control temperature and temperature control time of the temperature rise program are respectively 500 ℃ and 12h, and the corresponding sintering atmosphere is N 2 (ratio 7 -3 Pa；
The third group of temperature control temperature and temperature control time of the temperature rise program are respectively 700 ℃ and 20h, and the corresponding sintering atmosphere is N 2 Ar (ratio 7 -3 Pa；
The fourth group of temperature control temperature and temperature control time of the temperature rise program are respectively 770 ℃ and 16h, and the corresponding sintering atmosphere is N 2 Ar (ratio 7 -3 Pa；
The temperature control temperature and the temperature control time of the fifth group of the temperature rise program are respectively 950 ℃ and 12h, and the corresponding sintering atmosphere is N 2 Ar (ratio 5 -3 Pa；
The sixth group of temperature control temperature and the temperature control time of the temperature rise program are respectively 450 ℃ and 3h, and the corresponding sintering atmosphere is N 2 Ar (ratio 5 -3 Pa。
According to another aspect of the invention, the lithium manganate cathode target material for preparing a thin film lithium battery prepared by the preparation method of any one of the above is also provided.
The lithium manganate anode target for preparing the thin film lithium battery and the preparation method thereof can be specially suitable for the scheme of preparing the all-solid-state thin film lithium battery by adopting a magnetron sputtering coating mode, and solve the problem of no available suitable target in the process of preparing the all-solid-state thin film lithium battery by adopting the magnetron sputtering coating mode. Based on the lithium manganate cathode target material prepared by the method and the magnetron sputtering coating technology, the contact surface resistance of the prepared all-solid-state thin film lithium battery is obviously reduced, and the performance of the battery is obviously improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic diagram illustrating a method for preparing a lithium manganate positive electrode target for a thin film lithium battery according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a method for preparing a lithium manganate positive electrode target material for a thin film lithium battery according to an embodiment of the present invention.
The preparation method of the lithium manganate cathode target material generally comprises the following steps:
step A: and a premixing step, mixing lithium salt powder with manganese dioxide powder and manganese oxide powder according to a preset proportion to obtain premixed powder, wherein the lithium salt powder is selected from the group consisting of lithium oxide, lithium carbonate and lithium nitrate.
And B, step B: and a ball milling step, namely mixing the premixed powder with zirconia balls with preset particle sizes in a ball milling tank, adding a dispersing agent, then carrying out ball milling according to a preset first rotating speed and a preset first time length, then carrying out ball milling according to a preset second rotating speed and a preset second time length, then adding a binding agent with a preset weight, and then carrying out ball milling according to a preset third rotating speed and a preset third time length to obtain the synthetic powder.
And C: and a sieving step of sieving the synthesized powder.
Step D: and a pressing step, namely vibrating and pressurizing the sieved synthetic powder, and then pressurizing by adopting a cold isostatic pressing mode to obtain a blank.
Step E: and sintering, namely sintering the blank according to a preset temperature-raising program to obtain a sintered material, wherein the temperature-raising program comprises a plurality of groups of temperature-controlling temperatures and temperature-controlling durations which correspond one to one, and each group of temperature-controlling temperatures and temperature-controlling durations is respectively and correspondingly provided with a suitable sintering atmosphere.
Step F: and a cooling step, cooling the sintered material to obtain the lithium manganate cathode target material.
The lithium manganate cathode target material for preparing the thin-film lithium battery and the preparation method thereof can be specially suitable for the scheme of preparing the all-solid-state thin-film lithium battery by adopting a magnetron sputtering coating mode, and solve the problem of no available suitable target material in the process of preparing the all-solid-state thin-film lithium battery by adopting the magnetron sputtering coating mode. Based on the lithium manganate cathode target material prepared by the method and the magnetron sputtering coating technology, the contact surface resistance of the prepared all-solid-state thin film lithium battery is obviously reduced, and the performance of the battery is obviously improved.
In the premixing step, "the lithium salt powder is selected from the group consisting of lithium oxide, lithium carbonate, and lithium nitrate" means that the lithium salt powder is one or more of lithium oxide, lithium carbonate, and lithium nitrate. The proportion of the premixed powder can be set according to actual needs, and the proportion of each element of the product is ensured.
In the ball milling step, the grain diameter of the zirconia balls is 0.5 mm-6 mm, the ratio of the total volume of the zirconia balls to the volume of the ball milling tank is not more than one third, and the ratio of the total volume of the premixed powder and the zirconia balls to the volume of the ball milling tank is one half.
In the ball milling step, the ball milling jar is made of a hard ceramic material. The ball milling tank can be arranged in the ball mill. The rotating speed and the duration of the ball milling step can be controlled by a ball mill.
In the ball milling step, the weight of the dispersant is three thousandths of the total weight of the premixed powder.
In the ball milling step, the first rotating speed is 40-70 rpm, the first time duration is 3h, the second rotating speed is 200rpm, and the second time duration is more than 16 h.
In the ball milling step, the weight of the binder is one thousandth of the total weight of the premixed powder and the zirconia balls. And the third speed was 55rpm for a third period of 10 hours.
That is, in the ball milling process, the primary ball milling is performed at a low rotation speed, then the fine ball milling is performed at a high rotation speed, then the binder is added, and then the ball milling is performed at a low rotation speed. After the dispersant is added, the ball milling tank ball mills for 3 hours at an initial set rotation speed (i.e., a first rotation speed), and then ball mills for more than 16 hours at a constant rotation speed (i.e., a second rotation speed). Then, a binder is added into the ball mill tank in a weight which is one thousandth of the weight of the premixed powder, and then ball milling is carried out for 10 hours at another constant rotating speed (i.e., a third rotating speed).
By using the method, the synthetic powder with uniform particle size can be obtained, and the particle size of the synthetic powder can be controlled within a preset reasonable range.
In the sieving step, the mixture is sieved by a 500-mesh sieve. Through the sieving step, the particle size of the sieved synthetic powder can be further controlled within a preset reasonable range, and the particle size uniformity of the synthetic powder is ensured. The grain size of the qualified material after sieving does not exceed 500 meshes.
The pressing step is carried out in two steps.
First, vibration pressurization is performed. When the sieved synthetic powder is vibrated and pressurized, the sieved and weighed synthetic powder is poured into a vibrating die, and 1500t of pressurization is carried out in the vibrating and pressurizing process to form a die-pressed blank.
Then pressurizing in a cold isostatic pressing mode. And in the process of pressurizing by adopting a cold isostatic pressing mode, putting the qualified blank obtained in the step into a cold isostatic pressing machine, pressurizing by 300MPa, and maintaining the pressure for 60min.
By using the pressing method, the prepared blank is compact and fine and has good performance.
In the sintering step, the pressed blank is placed into an atmosphere sintering furnace (or a vacuum sintering furnace), then the temperature rise program of the atmosphere sintering furnace is set, and sintering is started. According to the sequence, the temperature-raising program can include six groups of temperature-controlling temperatures and temperature-controlling time lengths.
The first group of temperature control temperature and temperature control time of the temperature rise program are respectively 180 ℃ and 6h, and the corresponding sintering atmosphere is N 2 Ar (ratio 8 -3 Pa. Namely, N is always introduced during the sintering process (and during the temperature rise process before the sintering process) according to the first group of temperature control temperature and temperature control time length 2 Mixed gas with Ar (ratio 8 -3 Pa. Before executing the first group of temperature control temperature and temperature control time, adjusting to the corresponding sintering atmosphere, and raising the temperature from room temperature to 180 ℃.
The temperature control temperature and the temperature control time of the second group of the temperature increasing program are respectively 500 ℃ and 12h, and the corresponding sintering atmosphere is N 2 Ar (ratio 7 -3 Pa. That is, N is always introduced during the sintering process (and during the temperature rise process before sintering) according to the second group of temperature control temperature and temperature control time 2 Mixed gas with Ar (ratio 7 -3 Pa. Before executing the second group of temperature control temperature and temperature control time, adjusting to the corresponding sintering atmosphere, and raising the temperature from 180 ℃ to 500 ℃.
The third group of temperature control temperature and temperature control time of the temperature rise program are respectively 700 ℃ and 20h, and the corresponding sintering atmosphere is N 2 Ar (ratio 7 -3 Pa. Namely, N is always introduced during the sintering process (and during the temperature rise process before sintering) according to the third group of temperature control temperature and temperature control time length 2 Mixed gas with Ar (ratio 7 -3 Pa. Before executing the third group of temperature control temperature and temperature control time, adjusting to the corresponding sintering atmosphere, and raising the temperature from 500 ℃ to 700 ℃.
The fourth group of temperature control temperature and temperature control time of the temperature rise program are respectively 770 ℃ and 16h, and the corresponding sintering atmosphere is N 2 Ar (ratio 7 -3 Pa. Namely, N is always introduced during the sintering process (and during the temperature rise process before sintering) according to the fourth group of temperature control temperature and temperature control time length 2 Mixed gas with Ar (ratio 7 -3 Pa. Before the fourth group of temperature control temperature and temperature control time is executed, the temperature is adjusted to the corresponding sintering atmosphere, and the temperature is increased from 700 ℃ to 770 ℃.
The temperature control temperature and the temperature control time of the fifth group of the temperature rise program are respectively 950 ℃ and 12h, and the corresponding sintering atmosphere is N 2 Ar (ratio 5 -3 Pa. That is, N is always introduced during the sintering process (and during the temperature rise process before sintering) according to the fifth set of temperature control temperature and time 2 Mixed gas with Ar (ratio 5 -3 Pa. Before the fifth group of temperature control temperature and temperature control time is executed, the temperature is adjusted to the corresponding sintering atmosphere, and the temperature is increased from 770 ℃ to 950 ℃.
The sixth group of temperature control temperature and the temperature control time of the temperature rise program are respectively 450 ℃ and 3h, and the corresponding sintering atmosphere is N 2 (ratio 5 -3 Pa. Namely, in the process of sintering according to the sixth group of temperature control temperature and temperature control duration, the temperature is kept for 3h according to 450 ℃, and N is introduced all the time 2 Mixed gas with Ar (ratio 5 -3 Pa. Before the sixth set of temperature control temperature and temperature control time is executed, the temperature is adjusted to the corresponding sintering atmosphere, and the temperature is slowly cooled to 450 ℃ along with the furnace from 950 ℃.
In the cooling step, the lithium manganate cathode target material is naturally cooled to room temperature along with the furnace, and then the lithium manganate cathode target material can be taken out and machined to be in a proper size or shape, such as a round cake shape with a set thickness and a set diameter. The size and shape of the lithium manganate cathode target material should be easily known and adjusted by those skilled in the art based on the understanding of the present invention, and will not be described herein.
The lithium manganate anode target prepared by the method can provide a suitable target for magnetron sputtering coating, and provides favorable conditions for preparing an all-solid-state thin film lithium battery by adopting a magnetron sputtering coating mode.
Based on the lithium manganate anode target material, the preparation method thereof and the magnetron sputtering coating technology, the all-solid-state thin film lithium battery can very easily realize direct series connection of a plurality of single batteries, direct parallel connection of the plurality of single batteries and series and parallel connection combination of the plurality of single batteries, thereby remarkably improving the output voltage of the battery, increasing the monomer capacity of the battery pack, or realizing perfect combination of pressurization and capacity expansion, and having good application prospect.
As to the preparation of all-solid-state thin-film lithium batteries, further description will be made with reference to examples 1-3 below.
Example 1:
the lithium manganate anode target prepared by the method is deposited into a single graphene-based thin film lithium battery by adopting a magnetron sputtering coating technology: a graphene collector electrode film with the thickness of 6 mu m is coated on the surface of a copper foil with the thickness of 1 square meter, and a negative electrode film, a solid electrolyte film and a positive electrode film are sequentially deposited on the graphene collector electrode film. Wherein the thickness of the deposited negative electrode film is 4.5 μm, the thickness of the deposited solid electrolyte film is 1.5 μm, and the thickness of the deposited positive electrode film is 15 μm. The capacity of the resultant battery after formation was 9180 (mA · h).
Example 2:
the lithium manganate anode target prepared by the method is deposited with two graphene-based thin film lithium batteries connected in series by adopting a magnetron sputtering coating technology: a graphene collector thin film with the thickness of 7 mu m is coated on the surface of a copper foil with the square meter of 1 square meter, and a negative electrode thin film, a solid electrolyte thin film, a positive electrode thin film, a graphene collector thin film, a negative electrode thin film, a solid electrolyte thin film, a positive electrode thin film and a graphene collector thin film are sequentially deposited on the graphene collector thin film. The thickness of the deposited negative electrode film of each battery is 5.5 mu m, the thickness of the solid electrolyte film of each battery is 2.0 mu m, the thickness of the positive electrode film of each battery is 18.5 mu m, and the thickness of the graphene collector electrode film is 7 mu m. The capacity of the resultant battery after formation was 11322 (mA · h).
Example 3:
the lithium manganate anode target prepared by the method is deposited with two parallel graphene-based thin film lithium batteries by adopting a magnetron sputtering coating technology: a graphene collector thin film with the thickness of 7 mu m is coated on the surface of a copper foil with the thickness of 1 square meter, and a negative electrode thin film, a solid electrolyte thin film, a positive electrode thin film, a graphene collector, a positive electrode thin film, a solid electrolyte thin film, a negative electrode thin film and a graphene collector thin film are sequentially deposited on the graphene collector thin film. The thickness of the deposited negative electrode film of each battery is 6.5 mu m, the thickness of the deposited solid electrolyte film of each battery is 2.5 mu m, the thickness of the deposited positive electrode film of each battery is 22 mu m, and the thickness of the graphene collector electrode film is 7 mu m. The capacity of the resultant battery after formation was 26928 (mA · h).
In the above examples 1 to 3, the positive electrode thin film, the solid electrolyte thin film, and the negative electrode thin film were all prepared by the magnetron sputtering method. For example, the solid electrolyte film may be a lithium phosphate film, the negative electrode film may be a tin alloy film, and the positive electrode film may be a lithium manganate positive electrode film. The graphene collector electrode film is prepared by a coating or growing method.
The lithium manganate cathode target material for preparing the thin-film lithium battery and the preparation method thereof can be specially suitable for the scheme of preparing the all-solid-state thin-film lithium battery by adopting a magnetron sputtering coating mode, and solve the problem of no available suitable target material in the process of preparing the all-solid-state thin-film lithium battery by adopting the magnetron sputtering coating mode. Based on the lithium manganate cathode target material prepared by the method and the magnetron sputtering coating technology, the contact surface resistance of the prepared all-solid-state thin film lithium battery is obviously reduced, and the performance of the battery is obviously improved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A preparation method of a lithium manganate anode target material for preparing a thin film lithium battery comprises the following steps:
a pre-mixing step, mixing lithium-containing powder with manganese dioxide powder and manganese oxide powder according to a preset proportion to obtain pre-mixed powder, wherein the lithium-containing powder is selected from a substance group formed by lithium oxide, lithium carbonate and lithium nitrate;
a ball milling step, mixing the premixed powder with zirconia balls with a preset particle size in a ball milling tank, adding a dispersing agent, then carrying out ball milling according to a preset first rotating speed and a preset first time length, then carrying out ball milling according to a preset second rotating speed and a preset second time length, then adding a binding agent with a preset weight, and then carrying out ball milling according to a preset third rotating speed and a preset third time length to obtain synthetic powder;
a sieving step of sieving the synthetic powder;
a pressing step, namely vibrating and pressurizing the sieved synthetic powder, and then pressurizing by adopting a cold isostatic pressing mode to obtain a blank;
sintering, namely sintering the blank according to a preset temperature-raising program to obtain a sintered material, wherein the temperature-raising program comprises a plurality of groups of temperature-control temperatures and temperature-control durations which correspond to one another one by one, and each group of the temperature-control temperatures and the temperature-control durations are respectively and correspondingly provided with an applicable sintering atmosphere;
cooling, namely cooling the sintered material to obtain a lithium manganate positive electrode target material; wherein
In the sintering step, according to the sequence:
the first group of temperature control temperature and temperature control time of the temperature rise program are respectively 180 ℃ and 6h, and the corresponding sintering atmosphere is in proportion of 8:2 is N 2 Or vacuum degree of 10 -3 Pa；
The second group of temperature control temperature and temperature control time of the temperature rise program are respectively 500 ℃ and 12h, and the corresponding sintering atmosphere is in proportion of 7:3 is N 2 /Ar or vacuum degree of 10 -3 Pa；
The third group of temperature control temperature and temperature control time of the temperature rise program are respectively 700 ℃ and 20h, and the corresponding sintering atmosphere is in proportion of 7:3 is N 2 /Ar or vacuum degree of 10 -3 Pa；
The fourth group of temperature control temperature and temperature control time of the temperature rise program are respectively 770 ℃ and 16h, and the corresponding sintering atmosphere is in proportion of 7:3 is N 2 Or vacuum degree of 10 -3 Pa；
The temperature control temperature and the temperature control time of the fifth group of the temperature rise program are respectively 950 ℃ and 12h, and the corresponding sintering atmosphere is in a proportion of 5:5 of N 2 Or vacuum degree of 10 -3 Pa；
The sixth group of temperature control temperature and the temperature control time of the temperature rise program are respectively 450 ℃ and 3h, and the corresponding sintering atmosphere is in a proportion of 5:5 of N 2 /Ar or vacuum degree of 10 -3 Pa。
2. The method of claim 1, wherein
In the ball milling step, the particle size of the zirconia balls is 0.5 mm-6 mm, the ratio of the total volume of the zirconia balls to the volume of the ball milling tank is not more than one third, and the ratio of the total volume of the premixed powder and the zirconia balls to the volume of the ball milling tank is one half.
3. The method of claim 1, wherein
In the ball milling step, the ball milling jar is made of a hard ceramic material.
4. The method of claim 1, wherein
In the ball milling step, the weight of the dispersant is three thousandths of the total weight of the premixed powder.
5. The method of claim 1, wherein
In the ball milling step, the first rotating speed is 40-70 rpm, the first time duration is 3h, the second rotating speed is 200rpm, and the second time duration is more than 16 h.
6. The method of claim 1, wherein
In the ball milling step, the weight of the binder is one thousandth of the total weight of the premixed powder; and is provided with
The third rotation speed is 55rpm, and the third time period is 10h.
7. The method of claim 1, wherein
In the sieving step, a sieve of 500 meshes is sieved.
8. The method of claim 1, wherein
And in the vibration pressing process of the pressing step, pressing is carried out for 1500t.
9. The method of claim 1, wherein
And in the process of pressurizing by adopting a cold isostatic pressing mode in the pressing step, pressurizing at 300MPa for 60min.
10. The lithium manganate positive electrode target material for preparing thin film lithium battery prepared by the preparation method as set forth in any one of claims 1 to 9.
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