Lithium manganate catalytic preparation method based on flexible fiber film
By using flexible fiber thin film support and catalyst in lithium manganate synthesis, the problem of difficult to achieve large-scale production of high-temperature solid phase reactions in traditional methods is solved, and low-cost and efficient preparation of lithium manganate is achieved, and electrochemical performance is improved.
Patent Information
- Application Number
- CN202311371721.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-23
- Publication Date
- 2025-04-25
AI Technical Summary
The traditional lithium manganate synthesis method is based on high-temperature solid phase reaction, making it difficult to achieve large-scale production and is costly.
The flexible fiber film is used as a support, and the catalytic synthesis and post-treatment of lithium manganate is achieved through heat treatment and catalyst combination, and its morphology and performance are adjusted.
Large-scale production has been achieved, production costs have been reduced, the electrochemical performance of lithium manganate has been improved, and process conditions have been simplified, making it suitable for industrial production.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of lithium battery positive electrode materials, and in particular to a catalytic preparation method of lithium manganate based on a flexible fiber film. Background Art
[0002] Lithium manganese oxide is a common cathode material with advantages such as high theoretical capacity, good safety performance and low cost, and is widely used in the field of batteries. However, the traditional synthesis method of lithium manganese oxide is mainly based on high-temperature solid-phase reaction, which undergoes complex synthesis steps and is difficult to achieve large-scale production. Therefore, it is of great practical significance to develop a new preparation method of lithium manganese oxide to improve production efficiency and reduce costs. Summary of the invention
[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for preparing lithium manganate catalyst based on a flexible fiber film.
[0004] The technical solution of the present invention is:
[0005] A method for preparing lithium manganate catalyst based on flexible fiber film comprises the following steps:
[0006] S1. Material preparation: First, prepare a flexible fiber film, which is composed of polymer fibers and a catalyst. The polymer fibers can be polyethylene, polypropylene, or polyamide, and the catalyst can be metal salts, including manganese nitrate and manganese sulfate.
[0007] S2. Pretreatment of the flexible fiber film: heat-treating the flexible fiber film at a certain temperature to remove moisture and volatiles therein; at the same time, by controlling the temperature and time of the heat treatment, the catalyst is evenly dispersed on the fiber surface;
[0008] S3. Catalytic synthesis of lithium manganese oxide: immersing the pretreated flexible fiber film in a solution containing manganese ions, lithium ions and a solvent, then taking it out and drying it; in the flexible fiber film, the catalyst promotes the exchange of manganese ions and lithium ions to form lithium manganese oxide; by controlling the immersion time, drying time and temperature parameters, the morphology and properties of the lithium manganese oxide are adjusted;
[0009] S4. Post-treatment: The synthesized lithium manganese oxide is further purified and modified by heat treatment or chemical treatment; the solvent and unreacted substances are removed by heat treatment to improve the electrochemical properties of the lithium manganese oxide.
[0010] Preferably, in S1, when preparing the flexible fiber film, the types and specifications of the polymer fiber and the catalyst are carefully selected; the polymer fiber should have good flexibility, corrosion resistance and electrical insulation, and the catalyst should have high catalytic activity and good dispersibility.
[0011] Preferably, in S1, before preparing the flexible fiber film, the selected polymer fibers and catalyst are subjected to certain pretreatment; the polymer fibers are pretreated by stretching, heat treatment or chemical treatment to improve their performance and processing properties; the catalyst is uniformly dispersed in the polymer fibers by dissolution and dispersion methods.
[0012] Preferably, in S1, in order to ensure the quality and stability of the flexible fiber film, necessary measures are taken during the storage and transportation of the material; the flexible fiber film should be stored in a dry and ventilated place to avoid the influence of sunlight, high temperature and humidity; during transportation, severe vibration and impact should be avoided to avoid damage to the material or affect its performance.
[0013] Preferably, in said S1, when preparing the flexible fiber film, some necessary production equipment, such as a stirrer, a grinder, and a calender, are used; before preparing the materials, the performance and reliability of these equipment are checked to ensure that they can meet the requirements of the production process.
[0014] Preferably, in S1, during the preparation of the flexible fiber film, safety precautions should be taken; direct contact with irritating and harmful chemical reagents and catalysts should be avoided, and safety regulations on fire prevention and explosion prevention should be observed.
[0015] Preferably, in S4, morphology control is one of the important factors affecting the electrochemical properties of lithium manganese oxide, and affects the electrochemical reaction kinetics of lithium manganese oxide in the battery; in the post-processing process, the morphology and size of lithium manganese oxide are controlled to improve its electrochemical properties; and lithium manganese oxide materials with specific morphology and size are prepared by controlling the conditions of heat treatment or chemical treatment.
[0016] Preferably, in S4, heat treatment is one of the commonly used post-treatment methods, which removes solvents and unreacted substances, and at the same time makes the structure of the lithium manganese oxide material more regular and orderly; the temperature and time of heat treatment are important factors affecting the performance of lithium manganese oxide; appropriate heat treatment conditions increase the crystallinity and electrochemical activity of lithium manganese oxide, and improve the capacity and cycle stability of lithium manganese oxide.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] By using flexible fiber film as a carrier, large-scale production can be easily achieved and production efficiency can be improved.
[0019] By controlling the type and concentration of the catalyst, the morphology and properties of lithium manganese oxide can be adjusted to obtain excellent electrochemical properties.
[0020] The method has simple equipment and process conditions, is easy to operate, and is conducive to industrial production.
[0021] Compared with the traditional high-temperature solid-phase reaction method, this method has lower reaction temperature, less energy consumption and lower cost. DETAILED DESCRIPTION
[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0023] Example 1
[0024] This embodiment provides a method for preparing lithium manganate catalyst based on a flexible fiber film, comprising the following steps:
[0025] S1. Material preparation: First, prepare a flexible fiber film, which is composed of polymer fibers and a catalyst. The polymer fibers can be polyethylene, polypropylene, or polyamide, and the catalyst can be metal salts, including manganese nitrate and manganese sulfate.
[0026] S2. Pretreatment of the flexible fiber film: heat-treating the flexible fiber film at a certain temperature to remove moisture and volatiles therein; at the same time, by controlling the temperature and time of the heat treatment, the catalyst is evenly dispersed on the fiber surface;
[0027] S3. Catalytic synthesis of lithium manganese oxide: immersing the pretreated flexible fiber film in a solution containing manganese ions, lithium ions and a solvent, then taking it out and drying it; in the flexible fiber film, the catalyst promotes the exchange of manganese ions and lithium ions to form lithium manganese oxide; by controlling the immersion time, drying time and temperature parameters, the morphology and properties of the lithium manganese oxide are adjusted;
[0028] S4. Post-treatment: The synthesized lithium manganese oxide is further purified and modified by heat treatment or chemical treatment; the solvent and unreacted substances are removed by heat treatment to improve the electrochemical properties of the lithium manganese oxide.
[0029] Preferably, in S1, when preparing the flexible fiber film, the types and specifications of the polymer fiber and the catalyst are carefully selected; the polymer fiber should have good flexibility, corrosion resistance and electrical insulation, and the catalyst should have high catalytic activity and good dispersibility.
[0030] Preferably, in S1, before preparing the flexible fiber film, the selected polymer fibers and catalyst are subjected to certain pretreatment; the polymer fibers are pretreated by stretching, heat treatment or chemical treatment to improve their performance and processing properties; the catalyst is uniformly dispersed in the polymer fibers by dissolution and dispersion methods.
[0031] Preferably, in S1, in order to ensure the quality and stability of the flexible fiber film, necessary measures are taken during the storage and transportation of the material; the flexible fiber film should be stored in a dry and ventilated place to avoid the influence of sunlight, high temperature and humidity; during transportation, severe vibration and impact should be avoided to avoid damage to the material or affect its performance.
[0032] Preferably, in said S1, when preparing the flexible fiber film, some necessary production equipment, such as a stirrer, a grinder, and a calender, are used; before preparing the materials, the performance and reliability of these equipment are checked to ensure that they can meet the requirements of the production process.
[0033] Preferably, in S1, during the preparation of the flexible fiber film, safety precautions should be taken; direct contact with irritating and harmful chemical reagents and catalysts should be avoided, and safety regulations on fire prevention and explosion prevention should be observed.
[0034] Preferably, in S4, morphology control is one of the important factors affecting the electrochemical properties of lithium manganese oxide, and affects the electrochemical reaction kinetics of lithium manganese oxide in the battery; in the post-processing process, the morphology and size of lithium manganese oxide are controlled to improve its electrochemical properties; and lithium manganese oxide materials with specific morphology and size are prepared by controlling the conditions of heat treatment or chemical treatment.
[0035] Preferably, in S4, heat treatment is one of the commonly used post-treatment methods, which removes solvents and unreacted substances, and at the same time makes the structure of the lithium manganese oxide material more regular and orderly; the temperature and time of heat treatment are important factors affecting the performance of lithium manganese oxide; appropriate heat treatment conditions increase the crystallinity and electrochemical activity of lithium manganese oxide, and improve the capacity and cycle stability of lithium manganese oxide.
[0036] Compared with the prior art, the present invention has the following beneficial effects:
[0037] By using flexible fiber film as a carrier, large-scale production can be easily achieved and production efficiency can be improved.
[0038] By controlling the type and concentration of the catalyst, the morphology and properties of lithium manganese oxide can be adjusted to obtain excellent electrochemical properties.
[0039] The method has simple equipment and process conditions, is easy to operate, and is conducive to industrial production.
[0040] Compared with the traditional high-temperature solid-phase reaction method, this method has lower reaction temperature, less energy consumption and lower cost.
[0041] The lithium manganese oxide catalytic preparation method based on the flexible fiber film has the advantages of simple operation, mild reaction conditions, and easy industrial production, which can improve production efficiency and reduce costs. At the same time, by controlling the type and concentration of the catalyst, the morphology and performance of the lithium manganese oxide can be adjusted to obtain excellent electrochemical performance.
[0042] It should be noted that in the actual operation process, detailed process adjustment and optimization are required according to specific experimental conditions and requirements to ensure that the prepared lithium manganese oxide material has excellent performance and stability. In addition, attention should be paid to the selection and processing of materials, the selection and maintenance of equipment, etc., to ensure the smooth progress of the preparation process and the consistency of product quality.
[0043] In summary, the present invention provides a method for preparing lithium manganese oxide catalysis based on flexible fiber films, which has great practical value and broad application prospects, and is expected to provide new technical means and solutions for the development of the battery field.
Claims
1. A method for preparing lithium manganate catalyst based on flexible fiber film, characterized in that: The steps include: S1. Material preparation: First, prepare a flexible fiber film, which is composed of polymer fibers and a catalyst. The polymer fibers can be polyethylene, polypropylene, or polyamide, and the catalyst can be metal salts, including manganese nitrate and manganese sulfate. S2. Pretreatment of the flexible fiber film: heat-treating the flexible fiber film at a certain temperature to remove moisture and volatiles therein; at the same time, by controlling the temperature and time of the heat treatment, the catalyst is evenly dispersed on the fiber surface; S3, catalytic synthesis of lithium manganate: immersing the pretreated flexible fiber film in a solution containing manganese ions, lithium ions and a solvent, and then taking it out and drying it; In the flexible fiber film, the catalyst promotes the exchange of manganese ions and lithium ions to form lithium manganate. By controlling the immersion time, drying time and temperature parameters, the morphology and properties of lithium manganate are adjusted. S4. Post-treatment: The synthesized lithium manganese oxide is further purified and modified by heat treatment or chemical treatment; the solvent and unreacted substances are removed by heat treatment to improve the electrochemical properties of the lithium manganese oxide.
2. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In S1, when preparing the flexible fiber film, the types and specifications of the polymer fiber and the catalyst are carefully selected; the polymer fiber should have good flexibility, corrosion resistance and electrical insulation, and the catalyst should have high catalytic activity and good dispersibility.
3. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In S1, before preparing the flexible fiber film, the selected polymer fibers and catalysts are subjected to certain pretreatments; the polymer fibers are pretreated by stretching, heat treatment or chemical treatment to improve their performance and processing properties; the catalysts are uniformly dispersed in the polymer fibers by dissolving and dispersing methods.
4. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In S1, in order to ensure the quality and stability of the flexible fiber film, necessary measures should be taken during the storage and transportation of the material; the flexible fiber film should be stored in a dry and ventilated place to avoid the influence of sunlight, high temperature and humidity; During transportation, severe vibration and impact should be avoided to avoid damage to the material or affect its performance.
5. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In said S1, when preparing the flexible fiber film, some necessary production equipment, such as a stirrer, a grinder, and a calender, are used; before preparing the materials, the performance and reliability of these equipment are checked to ensure that they can meet the requirements of the production process.
6. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In S1, during the preparation of the flexible fiber film, safety precautions should be taken; direct contact with irritating and harmful chemical reagents and catalysts should be avoided, and safety regulations on fire prevention and explosion prevention should be observed.
7. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In S4, morphology control is one of the important factors affecting the electrochemical properties of lithium manganese oxide, and affects the electrochemical reaction kinetics of lithium manganese oxide in the battery; in the post-processing process, the morphology and size of lithium manganese oxide are controlled to improve its electrochemical properties; and lithium manganese oxide materials with specific morphology and size are prepared by controlling the conditions of heat treatment or chemical treatment.
8. The method for preparing lithium manganate catalyst based on flexible fiber film according to claim 1, characterized in that: In S4, heat treatment is one of the commonly used post-treatment methods, which removes solvents and unreacted substances and makes the structure of the lithium manganese oxide material more regular and orderly; the temperature and time of heat treatment are important factors affecting the performance of lithium manganese oxide; appropriate heat treatment conditions increase the crystallinity and electrochemical activity of lithium manganese oxide, and improve the capacity and cycle stability of lithium manganese oxide.