CN106698382A - Production technology of lithium iron phosphate - Google Patents
Production technology of lithium iron phosphate Download PDFInfo
- Publication number
- CN106698382A CN106698382A CN201510766462.9A CN201510766462A CN106698382A CN 106698382 A CN106698382 A CN 106698382A CN 201510766462 A CN201510766462 A CN 201510766462A CN 106698382 A CN106698382 A CN 106698382A
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- Prior art keywords
- lithium
- production technology
- iron phosphate
- vehicles
- lithium iron
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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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Abstract
Lithium iron phosphate (LiFePO4) is a novel cathode material for lithium ion batteries. Due to strong covalent bond effect, a highly stable crystal structure can be maintained during the charging and discharging process. In comparison with other traditional cathode materials such as lithium cobalt oxides (LiCoO2), lithium manganese oxides (LiMn2O4), etc., the cathode material of the invention has advantages of high energy density, low price, excellent safety, etc., and can be widely applied to energy-saving environment-friendly vehicles such as electrical vehicles, gas-electric hybrid vehicles, etc. The production technology mainly comprises the following processes: (1) burdening; (2) mixing; (3) heating; (4) aging; (5) drying; (6) ball-milling; and (7) sintering.
Description
LiFePO4（LiFePO4）It is the new anode material for lithium ion battery of a class, due to its strong covalent bond effect, highly stable crystal structure can be kept in charge and discharge process, with cobalt acid lithium（LiCoO2）, LiMn2O4（LiMn2O4）Compared Deng other traditional positive electrodes, have the advantages that energy density is high, price is low, excellent in safety, can be widely used for the energy saving and environment friendly vehicles such as electric automobile, oil-electric vehicle.
Properties of product and parameter
（1）Granularity is tiny, uniform
Because in process of producing product, raw material is mixed with liquid form, be difficult to make powder particle to produce agglomeration in heat treatment process, through microwave combustion method after, be obtained in that crystal grain is more tiny, the product that structure is more uniformly distributed.
（2）Charcoal bag is covered
The effect components of this product are LiFePO3 and C（Carbon black）, it is sintered after realize the crystal structure of C claddings nanoscale LiFePO3, increased the specific surface area of particle, shorten the diffusion path of Li+, increased electric conductivity, improve the charge-discharge performance of anode material.
（1）Dispensing
By the way of Manual material feeding, by lithium carbonate, di-iron trioxide, phosphoric acid, glucose, citric acid, pure water according to 3：6：9：2：4：4 mass ratio carries out dispensing, 1 hour dispensing time in material-compound tank.Order of adding is：
2. first adding phosphoric acid, glucose, citric acid, water, these four materials can quickly form solution；
2. to lithium carbonate is added in solution, it starts slowly neutralization reaction with phosphoric acid, generates lithium phosphate.Reaction equation：
3. di-iron trioxide is eventually adding, dispensing terminates.It is in sticky paste to prepare the material for completing, not stopping pregnancy life carbon dioxide minute bubbles.Blending process can produce the dust of a small amount of uncontrollable discharge, carbon dioxide G1-1.
（2）Batch mixing
The mechanical mass transport that will be prepared is added into ball mill batch mixing 2 hours, it is ensured that fully mix material.Because material is in sticky paste, mixing process will not produce dust pollution, only produce a small amount of carbon dioxide G1-2.
（3）Heating
Well mixed material is transferred in crystallizing tank, crystallizing tank is integrally transferred to by microwave drier by mechanical transport, be heated to 40-60 DEG C, accelerate the reaction of lithium carbonate and phosphoric acid, heating and continuous 2.5 hours.The process produces certain carbon dioxide and vapor G1-3.
（4）Ageing
Crystallizing tank is taken out from microwave drier, it is aged 5 hours under unlimited environment, the on the one hand reaction of guarantee lithium carbonate and phosphoric acid thoroughly, on the other hand makes the carbon dioxide in material system slowly escape, the particle diameter of material is promoted to tend to consistent, material particular diameter is about 100 mesh after ageing.The pollutants such as dust are not produced in sticky wet stock ageing process.
（5）Dry
The crystallizing tank that material will be filled is reentered into microwave drier, is heated to 120-140 DEG C, and drying time is 30 minutes, and material water ratio is about 2% after drying.Drying process produces certain vapor G1-4.
（6）Ball milling
Dried material is transferred to ball mill by mechanical transport, material particular diameter is decreased to 300 mesh in 3 hours by ball milling.Ball mill is completely closed, and the dust G1-5 of a small amount of uncontrollable discharge is only produced in charging and the process that discharges.
（7）Sintering
The good material of ball milling is transferred to microwave agglomerating furnace by mechanical transport, 600-800 DEG C is heated to, sintering lasts about 1 hour, and sintering reaction ultimately generates LiFePO4.
Reaction equation：
（8）Detection
Material main component obtained from after sintering is LiFePO4 and carbon black, and sintering reaction conversion ratio is close to 100%.Enter line density, granularity, purity, specific surface area, uniformity respectively to material afterwards.
（9）Grinding
If properties of product detection is qualified, material is transferred into grinder by mechanical transport carries out pulverization process, milling time 2 hours.
Claims (2)
1. a kind of LiFePO4 production technology.
2. the material composition and proportioning of LiFePO4 production process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510766462.9A CN106698382A (en) | 2015-11-12 | 2015-11-12 | Production technology of lithium iron phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510766462.9A CN106698382A (en) | 2015-11-12 | 2015-11-12 | Production technology of lithium iron phosphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106698382A true CN106698382A (en) | 2017-05-24 |
Family
ID=58918738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510766462.9A Pending CN106698382A (en) | 2015-11-12 | 2015-11-12 | Production technology of lithium iron phosphate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106698382A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101794881A (en) * | 2010-03-22 | 2010-08-04 | 河南联合新能源有限公司 | Method for preparing anode material of lithium ion batteries by one-step microwave sintering |
| US20110017947A1 (en) * | 2003-11-14 | 2011-01-27 | Gerhard Nuspl | Lithium metal phosphates, method for producing the same and use thereof as electrode material |
| CN103579587A (en) * | 2013-10-09 | 2014-02-12 | 山东海特电子新材料有限公司 | Preparation technique for quickly realizing uniform carbon coating of lithium iron phosphate material |
| CN104009234A (en) * | 2014-06-20 | 2014-08-27 | 刘新保 | Method for synthesizing anode material phosphate ferromanganese lithium for lithium ion cell through microwave method |
-
2015
- 2015-11-12 CN CN201510766462.9A patent/CN106698382A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110017947A1 (en) * | 2003-11-14 | 2011-01-27 | Gerhard Nuspl | Lithium metal phosphates, method for producing the same and use thereof as electrode material |
| CN101794881A (en) * | 2010-03-22 | 2010-08-04 | 河南联合新能源有限公司 | Method for preparing anode material of lithium ion batteries by one-step microwave sintering |
| CN103579587A (en) * | 2013-10-09 | 2014-02-12 | 山东海特电子新材料有限公司 | Preparation technique for quickly realizing uniform carbon coating of lithium iron phosphate material |
| CN104009234A (en) * | 2014-06-20 | 2014-08-27 | 刘新保 | Method for synthesizing anode material phosphate ferromanganese lithium for lithium ion cell through microwave method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170524 |