CN111029529A - Preparation method of positive electrode material structure, battery positive electrode, battery and automobile - Google Patents
Preparation method of positive electrode material structure, battery positive electrode, battery and automobile Download PDFInfo
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- H01—ELECTRIC ELEMENTS
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M4/00—Electrodes
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- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
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Abstract
The invention provides a preparation method of a positive electrode material structure, a battery positive electrode, a battery and an automobile, wherein the preparation method comprises the following steps: obtaining particles of a positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being greater than the second particle diameter; dispersing positive electrode material particles having a first particle diameter and positive electrode material particles having a second particle diameter in a dispersion liquid, and stirring and homogenizing to obtain a mixed slurry; coating the mixed slurry and then drying to obtain a mixed material; and calcining the mixture at 300-600 ℃ to obtain the cathode material structure. In the preparation method, the large particles and the small particles of the positive electrode material are reasonably proportioned by adopting a grading method, and the structure of the positive electrode material prepared by the method can improve the tap density of the positive electrode of the lithium ion battery, ensure that large pores and small pores exist simultaneously in the positive electrode, and ensure that the charge and discharge rate of the battery is not reduced by the transmission of lithium ions through electrolyte, thereby ensuring the charge and discharge rate performance of the battery.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a preparation method of a positive electrode material structure, a battery positive electrode, a battery and an automobile.
Background
With the increasing pressure of energy conservation and emission reduction in the automobile industry, pure electric vehicles and hybrid electric vehicles using lithium ion batteries for power storage/discharge become a focus of attention. The important index influencing the energy storage capacity of the lithium ion battery is the tap density of the anode material, generally speaking, the higher the tap density is, the more the anode material is in the same volume, the more the energy storage of the lithium ion battery is, the higher the tap density is, the smaller the pores are, the transfer of lithium ions through the electrolyte is not facilitated, the greater the influence on the charge and discharge multiplying power of the battery is, and the charge and discharge rate of the battery is reduced.
Disclosure of Invention
In view of the above, the invention provides a preparation method of a positive electrode material structure, a battery positive electrode, a battery and an automobile.
In order to solve the technical problems, the invention adopts the following technical scheme:
the preparation method of the positive electrode material structure comprises the following steps:
obtaining particles of a positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being greater than the second particle diameter;
dispersing positive electrode material particles having a first particle diameter and positive electrode material particles having a second particle diameter in a dispersion liquid, and stirring and homogenizing to obtain a mixed slurry;
coating the mixed slurry and then drying to obtain a mixed material;
and calcining the mixture at 300-600 ℃ to obtain the cathode material structure.
Further, the ratio of the first particle diameter to the second particle diameter is from 2:1 to 20: 1.
Further, the mass ratio of the positive electrode material particles having the first particle diameter to the positive electrode material particles having the second particle diameter is 4:1 to 1: 4.
Further, the positive electrode material particles are at least one of lithium iron phosphate particles, nickel cobalt manganese ternary material particles, nickel cobalt lithium aluminate particles or lithium manganate particles.
Further, obtaining particles of a positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being larger than the second particle diameter, includes:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution;
wherein the concentration of iron ions in the mixed solution is 0.5-1mol/L, the concentration of phosphate ions is 0.5-1.5mol/L, and the concentration of lithium ions is 0.5-1 mol/L;
placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the temperature of 140-180 ℃, the reaction pressure of 0.58-0.65 MPa and the reaction time of 2-4 h;
filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter;
the iron source raw material is one of ferrous sulfate, ferric nitrate and ferric chloride, the phosphorus source raw material is one of phosphoric acid, diammonium hydrogen phosphate and ammonium dihydrogen phosphate, and the lithium source raw material is one of lithium hydroxide, lithium chloride and lithium nitrate.
Further, obtaining particles of a positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being larger than the second particle diameter, includes:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution;
wherein the concentration of iron ions in the mixed solution is 0.5-1mol/L, the concentration of phosphate ions is 0.5-1.5mol/L, and the concentration of lithium ions is 0.5-1 mol/L;
placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the temperature of 110-140 ℃, the reaction pressure of 0.4-0.55 MPa and the reaction time of 0.5-2 h;
filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter;
the iron source raw material is one of ferrous sulfate, ferric nitrate and ferric chloride, the phosphorus source raw material is one of phosphoric acid, diammonium hydrogen phosphate and ammonium dihydrogen phosphate, and the lithium source raw material is one of lithium hydroxide, lithium chloride and lithium nitrate.
The battery positive electrode according to the embodiment of the second aspect of the invention is prepared by using the positive electrode material structure obtained by the preparation method in the above embodiment.
A battery according to an embodiment of the third aspect of the present invention includes the battery positive electrode in the above-described embodiment.
An automobile according to a fourth aspect of the invention includes the battery of the above embodiment.
The technical scheme of the invention has the following beneficial effects:
according to the preparation method of the cathode material structure, cathode material particles with a first particle diameter and a second particle diameter are obtained, and the first particle diameter is larger than the second particle diameter; dispersing positive electrode material particles having a first particle diameter and positive electrode material particles having a second particle diameter in a dispersion liquid, and stirring and homogenizing to obtain a mixed slurry; coating the mixed slurry and then drying to obtain a mixed material; and calcining the mixture at 300-600 ℃ to obtain the cathode material structure. In the preparation method, the large particles and the small particles of the positive electrode material are reasonably proportioned by adopting a grading method, the positive electrode material prepared by the method can ensure a certain pore structure while improving the tap density of the positive electrode of the lithium ion battery, ensure that large pores and small pores exist in the positive electrode at the same time, and ensure that the charge and discharge rate of the battery is not reduced by the transmission of lithium ions through electrolyte, thereby ensuring the charge and discharge rate performance of the battery.
Drawings
Fig. 1 is a schematic flow chart of a method for manufacturing a positive electrode material structure according to an embodiment of the present invention;
fig. 2 is a schematic view of an internal structure of a positive electrode material structure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The method for preparing the positive electrode material structure according to the embodiment of the present invention is specifically described below.
The preparation method of the cathode material structure provided by the embodiment of the invention comprises the following steps:
step S1 of obtaining positive electrode material particles having a first particle diameter and a second particle diameter, the first particle diameter being larger than the second particle diameter;
a step S2 of dispersing the positive electrode material particles having the first particle diameter and the positive electrode material particles having the second particle diameter in the dispersion liquid and stirring and homogenizing to obtain a mixed slurry;
step S3, drying the mixed slurry after coating to obtain a mixed material;
and step S4, calcining the mixture at 300-600 ℃ to obtain the positive electrode material structure.
That is, as shown in fig. 1, in step S1, positive electrode material particles having a first particle diameter and positive electrode material particles having a second particle diameter are respectively obtained, where the positive electrode material particles may be at least one of lithium iron phosphate particles, nickel cobalt manganese ternary material particles, lithium nickel cobalt aluminate particles or lithium manganate particles, such as lithium iron phosphate particles, the first particle diameter is larger than the second particle diameter, and a ratio of the first particle diameter to the second particle diameter may be 2:1-20:1, for example, the first particle diameter may be selected to be 100nm-300nm, and the second particle diameter may be selected to be 20nm-120nm, for example, the first particle diameter may be 120nm, and the second particle diameter may be 30 nm; in step S2, dispersing positive electrode material particles having a first particle diameter and positive electrode material particles having a second particle diameter in a dispersion liquid, wherein the mass ratio of the positive electrode material particles having the first particle diameter to the positive electrode material particles having the second particle diameter may be 4:1 to 1:4, for example, 2:1, and the dispersion liquid may be ethanol, and stirring and homogenizing the mixture to obtain a mixed slurry; step S3, coating the mixed slurry and then drying to obtain a mixed material; step S4, calcining the mixture at 300-600 ℃ to obtain the positive electrode material structure, for example, 600 ℃ can be selected. In addition, the steps S2, S3 and S4 may be performed under oxygen-free or inert gas protection to prevent oxygen or other gases from oxidizing or affecting the material.
Because the positive electrode material particles with the first particle diameter and the positive electrode material particles with the second particle diameter are mixed in the mixture, the large particles and the small particles of the positive electrode material are reasonably proportioned by adopting a grading method, and the positive electrode material structure prepared by the method can ensure a certain pore structure while improving the tap density of the positive electrode of the lithium ion battery, as shown in figure 2, the small particles are filled in gaps among the large particles, so that the simultaneous existence of large pores and small pores in the positive electrode is ensured, lithium ions are transmitted through electrolyte, the charge and discharge rate of the battery is ensured not to be reduced, and further the charge and discharge rate performance of the battery is ensured. In the practical process, the large particle and small particle lithium ion battery anode nano material is mixed, the homogenization diameter ratio of the large particle with the first particle diameter to the small particle with the second particle diameter can be 2:1-10:1, and the small particles can fill part of pores in cooperation with homogenization; and homogenizing, coating and sintering the mixed materials to prepare the positive electrode material structure. Calculation shows that the structural density of the anode material prepared by the method can be improved by 5-10%, the capacity of the battery is improved, the specific surface area can be improved by 3-5%, and the large pores and the small pores are matched, so that the charge-discharge multiplying power of the battery is basically unchanged or improved.
In some embodiments of the present invention, obtaining particles of a positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being larger than the second particle diameter, may include: respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent can be deionized water; wherein the concentration of iron ions in the mixed solution is 0.5-1mol/L, the concentration of phosphate ions is 0.5-1.5mol/L, and the concentration of lithium ions is 0.5-1 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas, the inert gas can be nitrogen, the reaction temperature is 140-180 ℃, the reaction pressure is 0.58-0.65 MPa, and the reaction time is 2-4 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter; the iron source raw material can be one of ferrous sulfate, ferric nitrate and ferric chloride, the phosphorus source raw material can be one of phosphoric acid, diammonium hydrogen phosphate and ammonium dihydrogen phosphate, and the lithium source raw material can be one of lithium hydroxide, lithium chloride and lithium nitrate.
In other embodiments of the present invention, obtaining particles of positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being greater than the second particle diameter, may include: respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent can be deionized water; wherein the concentration of iron ions in the mixed solution is 0.5-1mol/L, the concentration of phosphate ions is 0.5-1.5mol/L, and the concentration of lithium ions is 0.5-1 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the temperature of 110-140 ℃, the reaction pressure of 0.4-0.55 MPa and the reaction time of 0.5-2 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter; the iron source raw material can be one of ferrous sulfate, ferric nitrate and ferric chloride, the phosphorus source raw material can be one of phosphoric acid, diammonium hydrogen phosphate and ammonium dihydrogen phosphate, and the lithium source raw material can be one of lithium hydroxide, lithium chloride and lithium nitrate.
Lithium iron phosphate particles having a first particle diameter and lithium iron phosphate particles having a second particle diameter are prepared in conjunction with some specific examples below.
Example 1
Preparing lithium iron phosphate particles having a first particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent is deionized water; wherein the concentration of iron ions in the mixed solution is 0.5mol/L, the concentration of phosphate ions is 1mol/L, and the concentration of lithium ions is 0.8 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the reaction temperature of 140 ℃, the reaction pressure of 0.61MPa and the reaction time of 4 hours; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Preparing lithium iron phosphate particles having a second particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution; wherein the concentration of iron ions in the mixed solution is 0.5mol/L, the concentration of phosphate ions is 1.5mol/L, and the concentration of lithium ions is 1 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the reaction temperature of 110 ℃, the reaction pressure of 0.55MPa and the reaction time of 0.5 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Example 2
Preparing lithium iron phosphate particles having a first particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent is deionized water; wherein the concentration of iron ions in the mixed solution is 0.7mol/L, the concentration of phosphate ions is 1.5mol/L, and the concentration of lithium ions is 0.5 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas, the reaction temperature is 180 ℃, the reaction pressure is 0.58MPa, and the reaction time is 2 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Preparing lithium iron phosphate particles having a second particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution; wherein the concentration of iron ions in the mixed solution is 0.7mol/L, the concentration of phosphate ions is 0.5mol/L, and the concentration of lithium ions is 0.8 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas, the reaction temperature is 140 ℃, the reaction pressure is 0.5MPa, and the reaction time is 1.3 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Example 3
Preparing lithium iron phosphate particles having a first particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent is deionized water; wherein the concentration of iron ions in the mixed solution is 1mol/L, the concentration of phosphate ions is 0.5mol/L, and the concentration of lithium ions is 1 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the reaction temperature of 160 ℃, the reaction pressure of 0.65MPa and the reaction time of 3 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium chloride.
Preparing lithium iron phosphate particles having a second particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution; wherein the concentration of iron ions in the mixed solution is 1mol/L, the concentration of phosphate ions is 1mol/L, and the concentration of lithium ions is 0.5 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution reacts under the protection of inert gas at the reaction temperature of 130 ℃, the reaction pressure of 0.4MPa and the reaction time of 2 hours; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Example 4
Preparing lithium iron phosphate particles having a first particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent is deionized water; wherein the concentration of iron ions in the mixed solution is 0.5mol/L, the concentration of phosphate ions is 0.5mol/L, and the concentration of lithium ions is 0.8 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas, the reaction temperature is 180 ℃, the reaction pressure is 0.65MPa, and the reaction time is 2 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Preparing lithium iron phosphate particles having a second particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution; wherein the concentration of iron ions in the mixed solution is 0.8mol/L, the concentration of phosphate ions is 0.5mol/L, and the concentration of lithium ions is 0.8 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution reacts under the protection of inert gas at the reaction temperature of 130 ℃, the reaction pressure of 0.4MPa and the reaction time of 1 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Example 5
Preparing lithium iron phosphate particles having a first particle diameter, comprising the steps of:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution, wherein the solvent is deionized water; wherein the concentration of iron ions in the mixed solution is 0.5mol/L, the concentration of phosphate ions is 0.5mol/L, and the concentration of lithium ions is 1 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas, the reaction temperature is 160 ℃, the reaction pressure is 0.65MPa, and the reaction time is 2 hours; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
Preparing lithium iron phosphate particles having a second particle diameter, comprising the steps of: respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution; wherein the concentration of iron ions in the mixed solution is 0.8mol/L, the concentration of phosphate ions is 0.5mol/L, and the concentration of lithium ions is 0.8 mol/L; placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution reacts under the protection of inert gas at the reaction temperature of 130 ℃, the reaction pressure of 0.4MPa and the reaction time of 1 h; filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter; the iron source raw material is ferrous sulfate, the phosphorus source raw material is phosphoric acid, and the lithium source raw material is lithium hydroxide.
The embodiment of the invention also provides a battery anode which is prepared by utilizing the anode material structure obtained by the preparation method in the embodiment. The method has the advantages that large particles and small particles of the anode material are reasonably proportioned by adopting a grading method, the anode material structure prepared by the method is used for preparing the anode of the battery, the tap density of the anode of the lithium ion battery can be improved, a certain pore structure is ensured, large pores and small pores in the anode are ensured to exist simultaneously, lithium ions are transmitted through electrolyte, the charge and discharge rate of the battery is ensured not to be reduced, and the charge and discharge rate performance of the battery is further ensured.
The embodiment of the invention also provides a battery, which comprises the battery anode in the embodiment. The battery with the battery anode has high charge-discharge rate, so that the charge-discharge rate performance of the battery is improved.
The embodiment of the invention also provides an automobile which comprises the battery in the embodiment. The charge and discharge rate of the battery of the automobile is high, and the charge and discharge rate performance of the battery is further improved.
Other structures and operations of the battery and the automobile according to the embodiment of the present invention will be understood and easily accomplished by those skilled in the art, and thus will not be described in detail.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The preparation method of the positive electrode material structure is characterized by comprising the following steps of:
obtaining particles of a positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being greater than the second particle diameter;
dispersing positive electrode material particles having a first particle diameter and positive electrode material particles having a second particle diameter in a dispersion liquid, and stirring and homogenizing to obtain a mixed slurry;
coating the mixed slurry and then drying to obtain a mixed material;
and calcining the mixture at 300-600 ℃ to obtain the cathode material structure.
2. The method of claim 1, wherein the ratio of the first particle diameter to the second particle diameter is from 2:1 to 20: 1.
3. The production method according to claim 1, characterized in that the mass ratio of the positive electrode material particles having the first particle diameter to the positive electrode material particles having the second particle diameter is 4:1 to 1: 4.
4. The production method according to claim 1, wherein the positive electrode material particles are at least one of lithium iron phosphate particles, nickel cobalt manganese ternary material particles, lithium nickel cobalt aluminate particles, or lithium manganate particles.
5. The production method according to claim 1, wherein obtaining particles of the positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being larger than the second particle diameter, comprises:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution;
wherein the concentration of iron ions in the mixed solution is 0.5-1mol/L, the concentration of phosphate ions is 0.5-1.5mol/L, and the concentration of lithium ions is 0.5-1 mol/L;
placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the temperature of 140-180 ℃, the reaction pressure of 0.58-0.65 MPa and the reaction time of 2-4 h;
filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a first particle diameter;
the iron source raw material is one of ferrous sulfate, ferric nitrate and ferric chloride, the phosphorus source raw material is one of phosphoric acid, diammonium hydrogen phosphate and ammonium dihydrogen phosphate, and the lithium source raw material is one of lithium hydroxide, lithium chloride and lithium nitrate.
6. The production method according to claim 1, wherein obtaining particles of the positive electrode material having a first particle diameter and a second particle diameter, the first particle diameter being larger than the second particle diameter, comprises:
respectively adding an iron source raw material, a phosphorus source raw material and a lithium source raw material into a solvent, dissolving and mixing to obtain a mixed solution;
wherein the concentration of iron ions in the mixed solution is 0.5-1mol/L, the concentration of phosphate ions is 0.5-1.5mol/L, and the concentration of lithium ions is 0.5-1 mol/L;
placing the mixed solution in a closed pressure container for reaction, wherein the mixed solution is reacted under the protection of inert gas at the temperature of 110-140 ℃, the reaction pressure of 0.4-0.55 MPa and the reaction time of 0.5-2 h;
filtering after the reaction is finished, and washing to obtain lithium iron phosphate particles with a second particle diameter;
the iron source raw material is one of ferrous sulfate, ferric nitrate and ferric chloride, the phosphorus source raw material is one of phosphoric acid, diammonium hydrogen phosphate and ammonium dihydrogen phosphate, and the lithium source raw material is one of lithium hydroxide, lithium chloride and lithium nitrate.
7. A battery positive electrode characterized by being produced using the positive electrode material structure obtained by the production method according to any one of claims 1 to 6.
8. A battery comprising the positive electrode for a battery as claimed in claim 7.
9. An automobile comprising the battery as claimed in claim 8.
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