CN107204435A - A kind of moisture control technique of LiFePO4 - Google Patents
A kind of moisture control technique of LiFePO4 Download PDFInfo
- Publication number
- CN107204435A CN107204435A CN201710416013.0A CN201710416013A CN107204435A CN 107204435 A CN107204435 A CN 107204435A CN 201710416013 A CN201710416013 A CN 201710416013A CN 107204435 A CN107204435 A CN 107204435A
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- CN
- China
- Prior art keywords
- lifepo4
- compressed air
- drying
- control technique
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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
- H01M4/58—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
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- 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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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The present invention provides a kind of moisture control technique of LiFePO4, comprises the following steps：Discharging：The LiFePO4 material come out from stove is sent directly into drying shed, overturning saggar by mechanical arm makes material enter pneumatic conveyer by changeover valve；Air-flow is conveyed：By the use of cold dry compressed air as carrier, LiFePO4 material is sent to storage tank from tank sending；Crush：By the use of the high temperature compressed air after heating as crushing and drying source of the gas, material is crushed and dried in airflow milling, the material after crushing is sieved into grading wheel；Packaging：Material after screening, which is entered, carries out gas solid separation in dedusting cabin, the material separated is packed into packaging system.LiFePO4 material is not contacted directly with surrounding air in the present invention, Gas grinding and drying are carried out using high temperature compressed air, make product moisture content ＜ 500ppm, have the advantages that technique is simple, with short production cycle, cost is low, energy consumption is low, product water content stable.
Description
Technical field
The present invention relates to electrochemical material manufacturing technology field, and in particular to a kind of moisture control technique of LiFePO4.
Background technology
The water content of LiFePO 4 of anode material finished product directly affects the chemical property of battery, the factory of LiFePO4
Family all can strictly control the water content of LiFePO4 in process of production, typically require moisture within 500ppm.But
Because LiFePO 4 powder particle is thin, specific surface area big, cause its water imbibition stronger.If in atmosphere open-assembly time it is slightly long or
Ambient humidity is higher, and its moisture can exceed 1000ppm.In order to control the moisture of LiFePO4, the side that most producers take
Formula is to increase drying process before packing, or in battery manufacturing process and slurry process before increase material roasting plant,
There is producer that air-flow crushing, mixing, packaging process are placed in drying shed to or carried out under nitrogen atmosphere crushing packing, these sides
There is time-consuming, power consumption, the problems such as environmental condition requires high in method.It is placed in using by air-flow crushing, mixing, packaging process in drying shed
Technology be although easier to realize, process costs are relatively low, but exist and require high to environmental condition, and moisture control is unstable etc.
Problem, easily causes moisture exceeded due to environmental change.Although carrying out crushing packing in nitrogen atmosphere can effectively control
Product moisture content processed, but be due to that gas consumption is big in Crushing with Jet Mill, the low problem of nitrogen utilization rate will cause cost anxious
Play rises, or even higher than increase drying process cost before packing, it is impossible to effectively reduce energy consumption.
The content of the invention
It is an object of the invention to provide a kind of moisture control technique of LiFePO4, LiFePO4 material is in process of production
Do not contacted with surrounding air directly, and Gas grinding and drying are carried out using high temperature compressed air, make LiFePO4 product
Moisture is qualified, has the advantages that technique is simple, with short production cycle, cost is low, energy consumption is low, product water content stable.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of moisture control technique of LiFePO4, comprises the following steps：
1) discharging：The LiFePO4 material come out from stove is sent directly into drying shed, overturning saggar by mechanical arm makes thing
Material enters pneumatic conveyer by changeover valve.
2) air-flow is conveyed：By the use of cold dry compressed air as carrier, LiFePO4 material is sent from pneumatic conveyer
To storage tank.
3) crush：Drying compressed air is heated using gas heater, the high temperature compressed air after heating is utilized
As crushing and drying source of the gas, material is crushed and dried in airflow milling, the material after crushing is carried out into grading wheel
Screening.
4) pack：Material after screening, which is entered, carries out gas solid separation in dedusting cabin, the material separated is directly entered
Automatic packaging system is packed.
According to above scheme, the dew point of the cold dry compressed air is less than -20 DEG C.
According to above scheme, the dew point of the drying compressed air is less than -20 DEG C, and the temperature is 120~180 DEG C.
According to above scheme, the automatic packaging system is directly connected to dedusting cabin outlet, and pilot process is not directly and ring
Border air is contacted.
LiFePO4 material is not contacted directly with surrounding air in process of production in the present invention, and material is touched
The control of compressed air dew point less than -20 DEG C, it is possible to prevente effectively from material absorbs water in process of production；Crushing process makes simultaneously
It is 120~180 DEG C with temperature and (is less than 120 degree, drying effect is bad；Higher than 180 degree, oxidation is serious) high temperature compressed air make
For grinding source of the gas, there is drying function simultaneously in crushing process, product moisture content is further ensured that.
Produced, can be produced granularity under relatively low cost and energy consumption condition and conformed to using the technique of the present invention
Summation moisture ＜ 500ppm LiFePO4 product.
The beneficial effects of the invention are as follows：
1) process of the invention is brief, eliminates the drying, mixing and screening process of traditional processing technology, substantially reduces phosphoric acid
The production cycle of iron lithium product；
2) it the present invention relates to equipment requirement low, simple to equipment need to only transform combination, gases used process is pressure
Energy consumption can be effectively reduced after contracting air, no extra cost, and simplified process, great amount of cost is saved；
3) material in the present invention is prevented effectively from material water suction, used simultaneously in process of production without outside air is directly contacted
High temperature compressed air is as grinding gas and drying source of the gas, under double insurance, and the product moisture content fluctuation of preparation is small, and quality is steady
Qualitative increase.
Brief description of the drawings
Fig. 1 is the process flow diagram of the present invention.
In figure：1st, drying shed；2nd, mechanical arm；3rd, pneumatic conveyer；4th, airflow milling storage tank；5th, compressed air inlet pipe；
6th, gas heater；7th, airflow milling；8th, grading wheel；9th, dedusting cabin；10th, automatic packaging system.
Embodiment
Technical scheme is illustrated with embodiment below in conjunction with the accompanying drawings.
Embodiment 1, is shown in Fig. 1：
The present invention provides a kind of moisture control technique of LiFePO4, comprises the following steps (see Fig. 1)：
1) discharging：The LiFePO4 material come out from stove is sent directly into drying shed 1, overturning saggar by mechanical arm 2 makes
Material enters pneumatic conveyer 3 by changeover valve.
2) air-flow is conveyed：By the use of cold dry compressed air as carrier, LiFePO4 material is sent from pneumatic conveyer 3
To storage tank 4.
3) crush：Drying compressed air is entered in gas heater 6 by compressed air inlet pipe 5, is heated to 160
DEG C, by the use of high temperature compressed air as crushing and drying source of the gas, material is delivered in airflow milling 6, to material in airflow milling 7
Crushed and dried, the material after crushing is sieved into grading wheel 8；
4) pack：Material after screening, which is entered, carries out gas solid separation in dedusting cabin 9, the material separated is directly entered automatically
Packaging system 10 is packed.
Further, the cold dry compressed air, the dew point of high temperature compressed air are below -20 DEG C；The automatic packaging
System 10 is directly connected to the outlet of the dedusting cabin 9.
After testing, LiFePO4 product moisture content ＜ 500ppm.
Embodiment 2：
Other steps are identical with implementing 1, and difference is step 3) in, drying compressed air, which is heated to after 120 DEG C, to be made
To crush and drying source of the gas.
After testing, LiFePO4 product moisture content ＜ 500ppm.
Embodiment 3：
Other steps are identical with implementing 1, and difference is step 3) in, drying compressed air, which is heated to after 180 DEG C, to be made
To crush and drying source of the gas.
After testing, LiFePO4 product moisture content ＜ 500ppm.
Above example is only used to illustrative and not limiting technical scheme, although above-described embodiment enters to the present invention
Detailed description is gone, the person skilled of this area should be understood：The present invention can be modified or replaced on an equal basis, but
Not departing from any modification and local replacement of spirit and scope of the invention all should cover in scope of the presently claimed invention.
Claims (4)
1. the moisture control technique of a kind of LiFePO4, it is characterised in that comprise the following steps：
1) discharging：The LiFePO4 material come out from stove is sent directly into drying shed, overturning saggar by mechanical arm makes thing
Material enters pneumatic conveyer by changeover valve；
2) air-flow is conveyed：By the use of cold dry compressed air as carrier, LiFePO4 material is sent to storage from pneumatic conveyer
In batch can；
3) crush：Drying compressed air is heated using gas heater, by the use of the high temperature compressed air after heating as
Crush and drying source of the gas, material is crushed and dried in airflow milling, the material after crushing is sieved into grading wheel；
4) pack：Material after screening, which is entered, carries out gas solid separation in dedusting cabin, the material separated is directly entered automatically
Packaging system is packed.
2. the moisture control technique of LiFePO4 according to claim 1, it is characterised in that the cold dry compressed air
Dew point is less than -20 DEG C.
3. the moisture control technique of LiFePO4 according to claim 1, it is characterised in that the gas heater plus
Hot temperature is 120~180 DEG C, and the dew point of the high temperature compressed air is less than -20 DEG C.
4. the moisture control technique of LiFePO4 according to claim 1, it is characterised in that the automatic packaging system is straight
Dedusting cabin outlet is connected in succession.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710416013.0A CN107204435A (en) | 2017-06-06 | 2017-06-06 | A kind of moisture control technique of LiFePO4 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710416013.0A CN107204435A (en) | 2017-06-06 | 2017-06-06 | A kind of moisture control technique of LiFePO4 |
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| Publication Number | Publication Date |
|---|---|
| CN107204435A true CN107204435A (en) | 2017-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710416013.0A Pending CN107204435A (en) | 2017-06-06 | 2017-06-06 | A kind of moisture control technique of LiFePO4 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436431A (en) * | 2019-06-29 | 2019-11-12 | 佛山市德方纳米科技有限公司 | A kind of preparation method and lithium ion battery of lithium iron phosphate positive material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105236377A (en) * | 2015-08-28 | 2016-01-13 | 江苏南大紫金锂电智能装备有限公司 | Water removal process of lithium iron phosphate |
| CN105742577A (en) * | 2016-04-20 | 2016-07-06 | 绵阳流能粉体设备有限公司 | Method and device for superfine grinding and drying of lithium iron phosphate in closed circulation of high-temperature drying gas |
| CN106129404A (en) * | 2016-07-24 | 2016-11-16 | 合肥国轩电池材料有限公司 | A kind of drying process of LiFePO4 |
-
2017
- 2017-06-06 CN CN201710416013.0A patent/CN107204435A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105236377A (en) * | 2015-08-28 | 2016-01-13 | 江苏南大紫金锂电智能装备有限公司 | Water removal process of lithium iron phosphate |
| CN105742577A (en) * | 2016-04-20 | 2016-07-06 | 绵阳流能粉体设备有限公司 | Method and device for superfine grinding and drying of lithium iron phosphate in closed circulation of high-temperature drying gas |
| CN106129404A (en) * | 2016-07-24 | 2016-11-16 | 合肥国轩电池材料有限公司 | A kind of drying process of LiFePO4 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436431A (en) * | 2019-06-29 | 2019-11-12 | 佛山市德方纳米科技有限公司 | A kind of preparation method and lithium ion battery of lithium iron phosphate positive material |
| CN110436431B (en) * | 2019-06-29 | 2021-11-02 | 佛山市德方纳米科技有限公司 | Preparation method of lithium iron phosphate cathode material and lithium ion battery |
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Application publication date: 20170926 |
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