CN116532017A - Homogenization method of battery anode material - Google Patents

Abstract

The invention discloses a method for homogenizing battery cathode materials, which comprises the following steps: Step 1: preparing raw materials: mixing required battery cathode materials and other additives according to a certain ratio to prepare a mixture. Step 2: Adding solvent: Add the mixture into an appropriate amount of solvent and stir well so that the mixture is evenly dispersed in the solvent. In the present invention, when high-power ultrasonic waves are coupled into the mixed slurry, the slurry is compressed and expanded in high-pressure and low-pressure cycles respectively, and in the low-pressure cycle, tiny vacuum bubbles are generated, and these bubbles will grow in multiple pressure cycles , during those periods of bubble growth, the gas in the liquid is adsorbed to the bubble surface and released from the liquid when it has a large enough size, which greatly reduces the bubbles in the slurry and improves the homogenization effect.

Description

Homogenization method for battery cathode material

technical field

The invention relates to the technical field of homogenizing battery positive electrode materials, and more specifically relates to a method for homogenizing battery positive electrode materials.

Background technique

A battery is a device that converts chemical energy into electrical energy and consists of one or more electrochemical cells. According to Wikipedia, a battery, as a power supply device, is mainly used to power electrical equipment. A battery can be composed of a single electrochemical cell, or a battery pack composed of multiple electrochemical cells, which can be connected in series, parallel or series-parallel. Batteries work by using redox reactions between electrolytes and metals to generate electricity. When two different metal substances (called electrodes) are put into a diluted electrolyte solution, due to the different electron affinities of the electrode metals, oxidation and reduction reactions will occur in the electrodes respectively, thereby generating electricity. The specific reaction mode can vary according to different types of batteries, such as lithium cobalt oxide batteries, lead-acid batteries, nickel-metal hydride batteries, etc. In short, a battery is a device that converts chemical energy into electrical energy. It is widely used in various electronic devices, vehicles, and energy storage systems. It is one of the indispensable key technologies in modern society.

Homogenization of battery cathode materials belongs to the field of battery material research, and is of great significance to the research and preparation of batteries such as lithium-ion batteries and sodium-ion batteries. Lithium-ion battery is currently the most common rechargeable battery, and the performance and stability of its positive electrode material directly affect key parameters such as battery life, safety performance and energy density. Therefore, it is one of the important tasks of battery materials research to conduct detailed research and analysis on the classification, composition and characteristics of battery cathode materials.

In the research of battery materials, it is often necessary to homogenize the battery cathode materials to meet the needs of subsequent experiments. The homogenization of battery positive electrode materials can improve the uniformity and operability of samples, which is conducive to ensuring the accuracy and reliability of experimental results. Therefore, in the research of battery materials, the homogenization technology of battery cathode materials is widely used and becomes a basic process in the preparation and testing of battery materials.

At present, there is insufficient homogenization in the homogenization process of the positive electrode material of the battery, and the powder particles may aggregate into agglomerates, resulting in uneven coating of the positive electrode of the battery. Therefore, need provide a kind of new technical scheme and give solution.

Contents of the invention

The purpose of the present invention is to provide a method for homogenizing battery positive electrode materials, which solves the current problem of insufficient homogenization in the homogenization process of battery positive electrode materials, and the powder particles may aggregate into clusters, resulting in uneven coating of battery positive electrodes The problem.

In order to achieve the above object, the present invention provides the following technical solutions: a method for homogenizing battery positive electrode materials, the method for homogenizing battery positive electrode materials includes the following steps:

Step 1: Prepare raw materials: Mix the required battery cathode materials and other additives in a certain proportion to make a mixture.

Step 2: Add solvent: Add the mixture to an appropriate amount of solvent and stir thoroughly so that the mixture is evenly dispersed in the solvent;

Step 3: Sonicate: Place the mixture in a sonicator for sonication. This can help the mixture to disperse more evenly in the solvent and eliminate uneven factors such as air bubbles;

Step 4: Filtration: filter the homogenized mixture through a filter to remove impurities and particles;

Step 5: Drying: The filtered mixture is dried in a drying oven to remove moisture and achieve the desired degree of dryness.

As a preferred embodiment of the present invention, the additive in step 1 is selected according to the battery type, and the positive electrode material of the battery is one of lithium cobaltate, lithium manganate and lithium iron phosphate.

As a preferred embodiment of the present invention, the solvent in step 2 may be one or a mixture of ethanol, N-methylpyrrolidone, acetone and xylene.

As a preferred embodiment of the present invention, the addition ratio of the additive is 1-5% by weight of the positive electrode material.

As a preferred embodiment of the present invention, the frequency of the ultrasonic wave for removing bubbles in the solvent is between 20-40 kHz, and the power is between 100-5000 W.

As a preferred embodiment of the present invention, the stirring time in the step 2 is 30-45 min, and the stirring temperature is 25-30°C.

Compared with the prior art, the beneficial effects of the present invention are as follows:

In the present invention, additives are added to the positive electrode material of the electrode, wherein the additives include carbon black, polyvinyl alcohol, silver polyacrylate, lithium carbonate, lithium fluoride, ammonium sulfate, lithium carbonate, silver polyacrylate, which can improve the electrical conductivity; Adhesiveness, enhanced material structure and electrical conductivity, has a good anti-oxidation function, while using ultrasonic treatment, when high-power ultrasonic waves are coupled into the mixed slurry, the slurry is compressed and expanded in high-pressure and low-pressure cycles respectively , in low-pressure cycles, tiny vacuum bubbles are created that grow over multiple pressure cycles, during those cycles of bubble growth, the gas in the liquid is adsorbed to the surface of the bubbles, and when of a sufficiently large size Released from the liquid, it greatly reduces the air bubbles in the slurry and improves the homogenization effect.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

The invention provides a technical solution: a method for homogenizing battery positive electrode materials. The method for homogenizing battery positive electrode materials includes the following steps:

Step 1: Prepare raw materials: Mix the required battery cathode materials and other additives in a certain proportion to make a mixture.

Step 2: Add solvent: Add the mixture to an appropriate amount of solvent and stir thoroughly so that the mixture is evenly dispersed in the solvent;

Step 3: Sonicate: Place the mixture in a sonicator for sonication. This can help the mixture to disperse more evenly in the solvent and eliminate uneven factors such as air bubbles;

Step 4: Filtration: filter the homogenized mixture through a filter to remove impurities and particles;

Step 5: Drying: The filtered mixture is dried in a drying oven to remove moisture and achieve the desired degree of dryness.

As a further improvement, in the step 1, the additives are selected according to the battery type, the positive electrode material of the battery is lithium cobalt oxide, and the additives may include carbon black, polyvinyl alcohol, and silver polyacrylate. Among them, carbon black can improve the electrical conductivity; PVA can promote the adhesion of materials in the mixture, and can play a role in enhancing the material structure and electrical conductivity.

As a further improvement, the solvent in step 2 can be ethanol, which can form a mixture with most organic matter and water.

As a further improvement, the addition ratio of the additive is 3% by weight of the positive electrode material.

As a further improvement, the frequency of the ultrasonic wave to remove bubbles in the solvent is between 30 kHz and the power is 2000 W.

As a further improvement, the stirring time in the step 2 is 40min, and the stirring temperature is 28°C.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The present invention adopts ultrasonic treatment. When high-power ultrasonic wave is coupled into the mixed slurry, the slurry is compressed and expanded in the high-pressure and low-pressure cycles respectively. In the low-pressure cycle, tiny vacuum bubbles will be generated, and these bubbles will be in multiple Growth during pressure cycles, during those cycles of bubble growth, the gas in the liquid is adsorbed to the surface of the bubbles and released from the liquid when they have a large enough size, greatly reducing the bubbles in the slurry and improving the homogenization Effect.

Example 2

The method for homogenizing battery cathode material comprises the following steps:

Step 1: Prepare raw materials: Mix the required battery cathode materials and other additives in a certain proportion to make a mixture.

Step 2: Add solvent: Add the mixture to an appropriate amount of solvent and stir thoroughly so that the mixture is evenly dispersed in the solvent;

Step 3: Sonicate: Place the mixture in a sonicator for sonication. This can help the mixture to disperse more evenly in the solvent and eliminate uneven factors such as air bubbles;

Step 4: Filtration: filter the homogenized mixture through a filter to remove impurities and particles;

Step 5: Drying: The filtered mixture is dried in a drying oven to remove moisture and achieve the desired degree of dryness.

Further improved, the additives in the step 1 are selected according to the battery type, the positive electrode material of the battery is lithium manganate, and the additives are lithium carbonate, lithium fluoride and ammonium sulfate, wherein lithium carbonate and lithium fluoride can adjust the lattice structure of the material And shorten the charge and discharge time; ammonium sulfate can improve the electrochemical performance of the material.

As a further improvement, the solvent in step 2 can be N-methylpyrrolidone, which can effectively dissolve some additives and positive electrode materials that are hardly soluble in other solvents.

As a further improvement, the addition ratio of the additive is 1% by weight of the positive electrode material.

As a further improvement, the frequency of the ultrasonic wave to remove bubbles in the solvent is between 20 kHz and the power is 1000 W.

As a further improvement, the stirring time in the step 2 is 30min, and the stirring temperature is 25°C.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The present invention adopts ultrasonic treatment. When high-power ultrasonic wave is coupled into the mixed slurry, the slurry is compressed and expanded in the high-pressure and low-pressure cycles respectively. In the low-pressure cycle, tiny vacuum bubbles will be generated, and these bubbles will be in multiple Growth during pressure cycles, during those cycles of bubble growth, the gas in the liquid is adsorbed to the surface of the bubbles and released from the liquid when they have a large enough size, greatly reducing the bubbles in the slurry and improving the homogenization Effect.

Example 3

The method for homogenizing battery cathode material comprises the following steps:

Step 1: Prepare raw materials: Mix the required battery cathode materials and other additives in a certain proportion to make a mixture.

Step 2: Add solvent: Add the mixture to an appropriate amount of solvent and stir thoroughly so that the mixture is evenly dispersed in the solvent;

Step 3: Sonicate: Place the mixture in a sonicator for sonication. This can help the mixture to disperse more evenly in the solvent and eliminate uneven factors such as air bubbles;

Step 4: Filtration: filter the homogenized mixture through a filter to remove impurities and particles;

Step 5: Drying: The filtered mixture is dried in a drying oven to remove moisture and achieve the desired degree of dryness.

Further improved, in the step 1, the additives are selected according to the battery type, the positive electrode material of the battery is lithium iron phosphate, the additives are lithium carbonate and silver polyacrylate, lithium carbonate can improve the discharge capacity and cycle life of the battery; AgPPA can improve the Electrical conductivity and oxidation resistance.

As a further improvement, the solvent in step 2 may be acetone, which is a low-toxic, volatile polar solvent, suitable for some preparation processes that require rapid drying.

As a further improvement, the addition ratio of the additive is 5% by weight of the positive electrode material.

As a further improvement, the frequency of the ultrasonic wave to remove bubbles in the solvent is between 40kHz and the power is 5000W.

As a further improvement, the stirring time in the step 2 is 45min, and the stirring temperature is 30°C.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The present invention adopts ultrasonic treatment. When high-power ultrasonic wave is coupled into the mixed slurry, the slurry is compressed and expanded in the high-pressure and low-pressure cycles respectively. In the low-pressure cycle, tiny vacuum bubbles will be generated, and these bubbles will be in multiple Growth during pressure cycles, during those cycles of bubble growth, the gas in the liquid is adsorbed to the surface of the bubbles and released from the liquid when they have a large enough size, greatly reducing the bubbles in the slurry and improving the homogenization Effect.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or fundamentals of the present invention. The present invention can be implemented in other specific forms without any specific features. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention.

The last few points should be explained: First, in the description of this application, it should be explained that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, which can be mechanical connection Or electrical connection, it can also be the internal communication of two components, it can be directly connected, "up", "down", "left", "right", etc. are only used to indicate the relative positional relationship, when the absolute position of the object being described change, the relative positional relationship may change.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. a method for homogenizing battery cathode material, characterized in that: the method for homogenizing battery cathode material comprises the steps: Step 1: Prepare raw materials: mix the required battery cathode materials and other additives in a certain proportion to make a mixture; Step 2: Add solvent: Add the mixture to an appropriate amount of solvent and stir thoroughly so that the mixture is evenly dispersed in the solvent; Step 3: Sonicate: Place the mixture in a sonicator for sonication. This can help the mixture to disperse more evenly in the solvent and eliminate uneven factors such as air bubbles; Step 4: Filtration: filter the homogenized mixture through a filter to remove impurities and particles; Step 5: Drying: The filtered mixture is dried in a drying oven to remove moisture and achieve the desired degree of dryness. 2. The homogenization method of a kind of battery cathode material according to claim 1, characterized in that: in the step 1, the additive is selected according to the battery type, and the battery cathode material is lithium cobaltate, lithium manganate and lithium iron phosphate One of. 3. The method for homogenizing the anode material of a battery according to claim 1, characterized in that: the solvent in the step 2 can be one or a mixture of ethanol, N-methylpyrrolidone, acetone and xylene . 4 . The method for homogenizing the cathode material of a battery according to claim 1 , wherein the addition ratio of the additive is 1-5% of the weight of the cathode material. 5 . The method for homogenizing battery anode materials according to claim 1 , wherein the frequency of the ultrasonic wave to remove air bubbles in the solvent is between 20-40 kHz, and the power is between 100-5000 W. 5 . 6 . The method for homogenizing battery anode materials according to claim 5 , wherein the stirring time in the step 2 is 30-45 minutes, and the stirring temperature is 25-30° C.