CN110921701A - Production process of lithium ion battery negative electrode material - Google Patents
Production process of lithium ion battery negative electrode material Download PDFInfo
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- CN110921701A CN110921701A CN201911081542.5A CN201911081542A CN110921701A CN 110921701 A CN110921701 A CN 110921701A CN 201911081542 A CN201911081542 A CN 201911081542A CN 110921701 A CN110921701 A CN 110921701A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/003—Titanates
- C01G23/005—Alkali titanates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the production of battery materials, in particular to a production process of a lithium ion battery cathode material, which comprises the steps of conveying raw materials to a reaction kettle in proportion for mixing and dispersing; drying the mixed and dispersed slurry; then solid-phase sintering is carried out on the dried powder; then conveying the sintered powder to a high-speed dispersion tank for dispersion; conveying the dispersed powder to a grinding system for circular grinding after iron removal; and finally, drying, sintering and packaging the ground slurry again. According to the invention, the production of the lithium titanate electrode material is completed through the working procedures of reaction, drying, sintering, dispersion, grinding, drying and sintering again and the like, the batch production of the electrode material is realized, the purpose of automatic production is achieved, the production efficiency is greatly improved, and the production cost is saved.
Description
Technical Field
The invention relates to a production process of a battery material, in particular to a production process of a lithium ion battery cathode material.
Background
At present, lithium ion batteries widely applied to the fields of portable equipment, satellites, reserve power supplies, electric vehicles and the like have the advantages of high specific energy, high specific power, small self-discharge, good cycle characteristic, quick charging, high efficiency, wide working temperature range, no environmental pollution and the like. Lithium ion batteries used in the market basically use carbon materials as negative electrodes, but the carbon materials as negative electrodes have some defects which are difficult to overcome in practical application, for example, the lithium ion batteries react with electrolyte in the first discharging process to form a surface passivation film, so that the consumption of the electrolyte and the first coulombic efficiency are low; the carbon electrode has a potential close to that of metallic lithium, and when the battery is overcharged, metallic lithium is easily precipitated on the surface of the carbon electrode, which may cause a short circuit and thus explosion of the battery. In order to solve the safety problem of lithium batteries, a great deal of research is carried out. Spinel Li4Ti5O12 is used as a novel lithium ion secondary battery cathode material, has the advantages of good cycle performance, no reaction with electrolyte, high safety performance, stable charge and discharge platform and the like compared with other commercialized materials, and is one of the most excellent lithium ion battery cathode materials which are concerned in recent years.
Compared with a carbon negative electrode material, lithium titanate has many advantages, wherein the intercalation of lithium ions in lithium titanate is reversible, the crystal form of the lithium ions is not changed in the process of intercalation or deintercalation of the lithium titanate, and the volume change is less than 1%, so that the lithium titanate is called as a zero-strain material, the structural damage caused by the back-and-forth expansion of an electrode material in charge and discharge cycles can be avoided, the cycle performance and the service life of the electrode are improved, the great attenuation of specific capacity caused by the increase of cycle times is reduced, and the lithium titanate has better cycle performance than a carbon negative electrode. However, the existing lithium titanate process has low automation degree, low production efficiency and difficult large-scale batch production.
Disclosure of Invention
Aiming at the technical problems, the invention provides a production process of a lithium ion battery cathode material, which can realize batch production and has higher automation degree.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production process of a lithium ion battery negative electrode material comprises the following steps:
(1) respectively conveying the lithium titanate electrode raw materials to a reaction kettle according to a proportion for mixing and dispersing;
(2) drying the mixed and dispersed slurry;
(3) carrying out high-temperature solid phase sintering on the dried powder;
(4) conveying the sintered powder to a high-speed dispersion tank to be dispersed with pure water;
(5) removing iron from the dispersed powder, and conveying the powder to a grinding system for grinding;
(6) then, drying the ground slurry again and sintering the slurry at high temperature in a solid phase again; and then crushing, drying and packaging to obtain a finished product.
Preferably, the raw materials are titanium hydroxide or titanium dioxide, lithium carbonate or lithium hydroxide hydrate, the raw materials are unpacked and then respectively put into feed hoppers of a feeding station, then the raw materials enter a feeding tank from the feed hoppers, and the raw materials are conveyed to the reaction kettle in the feeding tank through compressed gas or negative pressure to be mixed and dispersed.
Preferably, the raw materials are firstly metered in a metering tank and then quantitatively conveyed to the reaction kettle before being conveyed to the reaction kettle.
Preferably, the drying treatment in step (2) is performed using a spray drying tower.
Preferably, the powder dried by the spray drying tower is cooled, then conveyed to a powder storage tank, and then conveyed to a roller kiln from the powder storage tank for high-temperature solid-phase sintering.
Preferably, the powder in the powder storage tank is firstly conveyed to a roller kiln metering tank, and the roller kiln metering tank automatically and quantitatively charges the roller kiln with the powder.
Preferably, the powder sintered in the roller kiln is automatically discharged and then conveyed to the high-speed dispersion tank.
Preferably, the automatically discharged powder is firstly conveyed to a high-speed dispersion metering tank, then conveyed to a high-speed dispersion tank in a fixed amount, dispersed in the high-speed dispersion tank together with a certain amount of pure water, then conveyed to an iron removal device for iron removal, and conveyed to a sand mill for grinding.
Preferably, the ground slurry is firstly conveyed to a drying storage tank, then is pumped to a spray drying tower or a spray drying tower system for drying again, then is cooled to be dried again, and then is quantitatively conveyed to a roller kiln for high-temperature solid phase sintering again.
Preferably, the powder after being sintered again is firstly conveyed to a metering tank of a drying kiln, then is screened by a vibrating screen, then is conveyed to the drying kiln for drying, then is screened again by the vibrating screen, and is packaged into a finished product after being deironized.
According to the technical scheme, the production of the lithium titanate electrode material is completed through the working procedures of reaction, drying, sintering, dispersing, grinding, drying again, sintering, packaging and the like, the batch production of the battery material is realized, the aim of automatic production is fulfilled, the production efficiency is greatly improved, and the production cost is saved.
Drawings
FIG. 1 is a process flow diagram of the invention.
Detailed Description
The invention will be described in detail with reference to fig. 1, wherein the exemplary embodiments and illustrations of the invention are provided to explain the invention, but not to limit the invention.
A production process of a lithium ion battery negative electrode material comprises the following steps:
firstly, respectively conveying raw materials of titanium hydroxide or titanium dioxide, lithium carbonate or hydrated lithium hydroxide and pure water to a reaction kettle according to a proportion for mixing and dispersing, wherein other preferable compositions can also be adopted; in the invention, the raw materials of titanium hydroxide or titanium dioxide and lithium carbonate or lithium hydroxide hydrate are unpacked and then respectively poured into a feed hopper of a feeding station, then the raw materials enter a feeding tank from the feed hopper, and the raw materials are conveyed to the reaction kettle through a compressed gas or a negative pressure device at the bottom of the feeding tank. In the implementation process, before the raw materials are conveyed to the reaction kettle, the raw materials are firstly conveyed into the metering tank and quantitatively conveyed to the reaction kettle, so that the raw materials and the pure water are reacted and dispersed according to an accurate proportion, and the optimal effect is achieved.
Mixing and dispersing the raw materials and pure water in a reaction kettle, drying the slurry by adopting a spray drying tower, cooling the dried powder, conveying the powder to a powder storage tank, and conveying the powder from the powder storage tank to a roller kiln for sintering. In the implementation process, the powder in the powder storage tank is firstly conveyed to the roller kiln metering tank, the roller kiln metering tank automatically and quantitatively loads the powder into the roller kiln, and the sintered powder in the roller kiln is automatically discharged and then conveyed to the high-speed dispersion tank; through sintering metering tank and automatic business turn over material, not only can realize automated production, the effect of sintering is better moreover.
Then conveying the sintered powder to a high-speed dispersion tank for dispersion; the automatically discharged powder is firstly conveyed to a high-speed dispersion metering tank, then quantitatively conveyed to a high-speed dispersion tank, and mixed and dispersed with a certain amount of pure water in the high-speed dispersion tank; then the dispersed powder is deironized and then is conveyed to a grinding system for grinding; conveying the ground slurry to a drying storage tank, pumping to a spray or jet drying tower system for secondary drying, and quantitatively conveying the dried and cooled powder to a roller kiln for secondary sintering; and conveying the re-sintered powder to a drying kiln metering tank, screening by using a vibrating screen, conveying to a drying kiln for drying, screening again by using the vibrating screen, and then removing iron and packaging to obtain a finished product.
According to the process flow, the lithium titanate electrode production process can be used for continuous batch production, and is high in automation degree, simple in process and high in efficiency; the produced product has the advantages of good batch stability, high specific capacity, large tap density, complete reaction, complete crystal and the like.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention.
Claims (10)
1. A production process of a lithium ion battery negative electrode material comprises the following steps:
(1) respectively conveying the lithium titanate electrode raw materials to a reaction kettle according to a proportion for mixing and dispersing;
(2) drying the mixed and dispersed slurry;
(3) carrying out high-temperature solid phase sintering on the dried powder;
(4) conveying the sintered powder to a high-speed dispersion tank to be dispersed with pure water;
(5) removing iron from the dispersed powder, and conveying the powder to a grinding system for grinding;
(6) then, drying the ground slurry again and sintering the slurry at high temperature in a solid phase again; and then crushing, drying and packaging to obtain a finished product.
2. The production process of the lithium ion battery anode material according to claim 1, characterized in that: the raw materials adopt the composition of titanium hydroxide or titanium dioxide, lithium carbonate or hydrated lithium hydroxide, the raw materials are unpacked and then respectively put into feed hoppers of a feeding station, then the raw materials enter a feeding tank from the feed hoppers, and the raw materials are conveyed to the reaction kettle for mixing and dispersing through compressed gas or negative pressure in the feeding tank.
3. The production process of the lithium ion battery anode material according to claim 2, characterized in that: before the raw materials are conveyed to the reaction kettle, the raw materials firstly enter a metering tank for metering and then are conveyed to the reaction kettle quantitatively.
4. The production process of the lithium ion battery anode material according to claim 1, characterized in that: and (3) adopting a spray drying tower for drying treatment in the step (2).
5. The production process of the lithium ion battery anode material according to claim 4, characterized in that: and the powder dried by the spray drying tower is cooled firstly, then conveyed to a powder storage tank, and then conveyed to a roller kiln from the powder storage tank for high-temperature solid-phase sintering.
6. The production process of the lithium ion battery anode material according to claim 5, characterized in that: the powder in the powder storage tank is firstly conveyed to the roller kiln metering tank, and the roller kiln metering tank automatically and quantitatively loads the powder into the roller kiln.
7. The production process of the lithium ion battery anode material according to claim 6, characterized in that: and automatically discharging the powder sintered in the roller kiln, and then conveying the powder to the high-speed dispersion tank.
8. The production process of the lithium ion battery anode material according to claim 7, characterized in that: the powder after automatic discharging is firstly conveyed to a high-speed dispersion metering tank, then quantitatively conveyed to the high-speed dispersion tank, dispersed in the high-speed dispersion tank together with a certain amount of pure water, then conveyed to iron removal equipment for iron removal, and conveyed to a sand mill for grinding.
9. The production process of the lithium ion battery anode material according to claim 8, characterized in that: and conveying the ground slurry to a drying storage tank, pumping to a spray drying tower or a spray drying tower system for secondary drying treatment, cooling the powder subjected to secondary drying treatment, and quantitatively conveying to a roller kiln for secondary high-temperature solid-phase sintering.
10. The production process of the lithium ion battery anode material according to claim 9, characterized in that: and conveying the re-sintered powder to a drying kiln metering tank, screening by using a vibrating screen, conveying to a drying kiln for drying, screening again by using the vibrating screen, and then removing iron and packaging to obtain a finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911081542.5A CN110921701A (en) | 2019-11-07 | 2019-11-07 | Production process of lithium ion battery negative electrode material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911081542.5A CN110921701A (en) | 2019-11-07 | 2019-11-07 | Production process of lithium ion battery negative electrode material |
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| Publication Number | Publication Date |
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| CN110921701A true CN110921701A (en) | 2020-03-27 |
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| CN201911081542.5A Withdrawn CN110921701A (en) | 2019-11-07 | 2019-11-07 | Production process of lithium ion battery negative electrode material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382750A (en) * | 2020-10-20 | 2021-02-19 | 常州百利锂电智慧工厂有限公司 | Alcohol solvent wet coating system and processing technology for lithium battery ternary material |
| CN112430101A (en) * | 2020-11-30 | 2021-03-02 | 广东琅菱智能装备有限公司 | Powder raw material production line and production process thereof |
-
2019
- 2019-11-07 CN CN201911081542.5A patent/CN110921701A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382750A (en) * | 2020-10-20 | 2021-02-19 | 常州百利锂电智慧工厂有限公司 | Alcohol solvent wet coating system and processing technology for lithium battery ternary material |
| CN112382750B (en) * | 2020-10-20 | 2022-08-12 | 常州百利锂电智慧工厂有限公司 | Alcohol solvent wet coating system and processing technology for lithium battery ternary material |
| CN112430101A (en) * | 2020-11-30 | 2021-03-02 | 广东琅菱智能装备有限公司 | Powder raw material production line and production process thereof |
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Application publication date: 20200327 |