CN103762337A - Manufacturing method of positive plate of lithium iron phosphate cell - Google Patents
Manufacturing method of positive plate of lithium iron phosphate cell Download PDFInfo
- Publication number
- CN103762337A CN103762337A CN201110399831.7A CN201110399831A CN103762337A CN 103762337 A CN103762337 A CN 103762337A CN 201110399831 A CN201110399831 A CN 201110399831A CN 103762337 A CN103762337 A CN 103762337A
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- Prior art keywords
- iron phosphate
- positive plate
- aqueous slkali
- collector
- manufacture method
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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
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses a manufacturing method of a positive plate of a lithium iron phosphate cell. The method comprises the following steps of blending lithium iron phosphate slurry and coating the lithium iron phosphate slurry on a current collector; and before coating, an alkali solution is sprayed on the surface of the current collector or the current collector is immersed in the alkali solution so that the current collector is treated by the alkali solution. The manufacturing method can effectively improve coating efficiency and make the slurry adhere to the current collector so that the pole piece material does not fall off in winding. The manufacturing method is conducive to lithium iron phosphate cell popularization application.
Description
Technical field
The present invention relates to lithium ion battery field, be specifically related to the manufacture method of positive plate of iron phosphate lithium battery
Background technology
Lithium ion battery since commercialization, layered oxide LiCoO
2positive electrode, capacity is higher, has extended cycle life, but cobalt resource scarcity, expensive and there is toxicity, therefore seeking excellent honest and clean, the dependable performance of price, eco-friendly positive electrode becomes the important research direction of lithium ion battery.LiNiO
2, LiNi
xco
1-xo
2deng layered oxide with LiMn
2o
4for the spinel-type positive electrode of representative in the past decade obtains broad research, but due to its defect existing separately, restricted their development prospect.Since phase at the end of the nineties in last century, olivine-type LiFePO
4the research of positive electrode causes numerous researchers' concern.Olivine-type LiFePO
4the features such as positive electrode has that abundant raw material, inexpensive, nontoxic, environmental friendliness, theoretical capacity are higher, thermal stability and good cycle, are expected to become anode material for lithium-ion batteries of new generation.But, this LiFePO
4the ion of positive electrode and electronic conductivity are not good, cause charge-discharge magnification performance not good.This shortcoming has greatly affected LiFePO
4replace LiCoO
2become anode material for lithium-ion batteries of new generation.Researcher further finds, LiFePO
4this defect of positive electrode can overcome by preparing ultra-fine grain.By increasing material specific area, promote between particle be in contact with one another or coated with conductive charcoal can improve LiFePO
4the electric conductivity of positive electrode.But thereupon a new problem arose again.Along with the increase of specific area, the amount that is coated with required bonding agent and solvent also increases greatly, has brought very large difficulty to the coating of pole piece, and pole piece is prepared into after battery core or battery, is easy to occur falling material phenomenon.At present, LiFePO 4 material ubiquity coating difficult problem.
Summary of the invention
Object of the present invention is exactly the above problem for prior art, and a kind of preparation method of the positive plate of iron phosphate lithium battery that can improve LiFePO 4 material Painting effect is provided.For achieving the above object, the present invention has adopted following technical scheme:
The invention discloses a kind of manufacture method of positive plate of iron phosphate lithium battery, comprise the step of mixed phosphate iron lithium slurry and the LiFePO4 slurry mixing is coated to the step of collector, before coating, first with aqueous slkali, process collector, described processing refers to and aqueous slkali is sprayed on to collection liquid surface or collector is immersed in aqueous slkali.Preferably, described collector is aluminium foil.Described aqueous slkali is selected from one or more the mixing in sodium hydroxide solution, potassium hydroxide solution, lithium hydroxide solution.Preferably, described aqueous slkali is lithium hydroxide solution.The concentration of described aqueous slkali is 0.01-5mol/L.Preferably, the concentration of described aqueous slkali is 0.2-1mol/L.The described time with aqueous slkali processing collector is 5-60 second.
Owing to having adopted above scheme, the beneficial effect that the present invention possesses is:
Method of the present invention by first processing collector with aqueous slkali before coating, can effectively remove the greasy dirt of collection liquid surface, and corrosion collector that can be slight, improve the degree of roughness of collection liquid surface, make that slurry is easier to be attached on collector, thereby make pole piece when the operation such as reeling, there will not be to fall the situation of material.On the other hand, because the bonding force of slurry and collector is strengthened, make the surface density of pole piece can be higher, be conducive to applying of ferric phosphate lithium cell.
Embodiment
The invention provides a kind of manufacture method of positive plate of iron phosphate lithium battery, comprise the step of batch mixing and the step of coating.Batch mixing refers to LiFePO4, thickener, conductive agent, water and binding agent etc. is mixed and made into LiFePO4 slurry, and this step can adopt method well known to those skilled in the art in prior art.Coating refers to the LiFePO4 slurry mixing is coated on collector equably.In method of the present invention, before coating, first with aqueous slkali, collector is processed, be about to aqueous slkali and be sprayed on collection liquid surface or collector is immersed in aqueous slkali.The collector of positive plate is generally aluminium foil.Aqueous slkali used can be sodium hydroxide solution, the mixing of one or more in potassium hydroxide solution, lithium hydroxide solution.Preferably lithium hydroxide solution.So only preferred lithium hydroxide, can not bring other metal ion when being because using lithium hydroxide corrosive aluminum foil.
In method of the present invention, the concentration of processing the aqueous slkali of collector is generally 0.01-5mol/L, preferably 0.2-1mol/L.Alkaline concentration is too high, can improve extent of corrosion, destroys collector; Alkaline concentration is too low, and the time that does not have corrosiveness or corrosion is oversize.Why selecting the processing time is that 5-60 second is also the consideration based on extent of corrosion aspect.
Below by concrete enforcement, the present invention is done to further detailed description.
Embodiment 1
First batch mixing plays glue 1 hour by 4 grams of thickener CMC with 140 grams of water, then adds SP conductive agent to break conducting resinl 2 hours, and LiFePO4 and conductive agent SFG-6 are dry mixed 2 hours simultaneously, are then adding 40 grams of water wet mixings 2 hours; The above-mentioned conducting resinl of accomplishing fluently 30% is joined in wet feed LiFePO4 and stirred 2 hours, and then add residue conducting resinl 70% to stir 3 hours; In the slurry being stirred, add 4 grams of SBR, stir 1.5 hours; Add again 20 grams of water to regulate slurry viscosity, then sieve material, complete slurry preparation.
Coating is positioned over aluminium foil in the NaOH solution of 0.01mol/L, or NaOH solution is evenly sprayed to the positive and negative of aluminium foil, makes it to corrode 60 seconds, then dries.Again the slurry mixing is evenly coated on aluminium foil, dries, complete coating.
Embodiment 2
This embodiment is substantially the same manner as Example 1, the LiOH solution that just solution of corrosive aluminum foil is 5mol/L, and the processing time was 5 seconds.
Embodiment 3
This embodiment is substantially the same manner as Example 1, the LiOH solution that just solution of corrosive aluminum foil is 0.2mol/L, and the processing time was 30 seconds.
Embodiment 4
This embodiment is substantially the same manner as Example 1, the KOH solution that just solution of corrosive aluminum foil is 1mol/L, and the processing time was 20 seconds.
Embodiment 5
This embodiment is substantially the same manner as Example 1, the LiOH solution that just solution of corrosive aluminum foil is 0.4mol/L, and the processing time was 30 seconds.
Embodiment 6
This embodiment is substantially the same manner as Example 1, the LiOH solution that just solution of corrosive aluminum foil is 0.6mol/L, and the processing time was 20 seconds.Comparative example
First batch mixing plays glue 1 hour by 4 grams of CMC with 140 grams of water, then adds SP conductive agent to break conducting resinl 2 hours, and LiFePO4 and conductive agent SFG-6 are dry mixed 2 hours simultaneously, are then adding 40 grams of water wet mixings 2 hours; The above-mentioned conducting resinl of accomplishing fluently 30% is joined in wet feed LiFePO4 and stirred 2 hours, and then add residue conducting resinl 70% to stir 3 hours; In the slurry being stirred, add 4 grams of SBR, stir 1.5 hours; Add again 20 grams of water to regulate slurry viscosity, then sieve material, complete slurry preparation.
Coating is evenly coated in the slurry mixing on aluminium foil, dries, and completes coating.The pole piece that above-mentioned each example is manufactured, requires to cut into required width according to the battery process of 18650 models, then this positive plate and barrier film and negative plate is wound into electrical core coiling body.After testing, in each example, fraction defective (being mainly pole piece dressing drop ratio) is as shown in the table:
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | Comparative example |
| Fraction defective | 2％ | 1.9％ | 1.0％ | 1.1％ | 0.8％ | 0.7％ | 10.2％ |
This testing result confirms, adopts method provided by the invention can effectively solve the problem that ferric phosphate lithium cell falls to expect.
Claims (8)
1. the manufacture method of a positive plate of iron phosphate lithium battery, comprise the step of mixed phosphate iron lithium slurry and the LiFePO4 slurry mixing is coated to the step of collector, it is characterized in that: before coating, first with aqueous slkali, process collector, described processing refers to and aqueous slkali is sprayed on to collection liquid surface or collector is immersed in aqueous slkali.
2. the manufacture method of a kind of positive plate of iron phosphate lithium battery according to claim 1, is characterized in that: described collector is aluminium foil.
3. the manufacture method of a kind of positive plate of iron phosphate lithium battery according to claim 1, is characterized in that: described aqueous slkali is selected from one or more the mixing in sodium hydroxide solution, potassium hydroxide solution, lithium hydroxide solution.
4. the manufacture method of a kind of positive plate of iron phosphate lithium battery according to claim 1, is characterized in that: described aqueous slkali is potassium hydroxide solution.
5. according to the manufacture method of a kind of positive plate of iron phosphate lithium battery described in claim 1-4 any one, it is characterized in that: the concentration of described aqueous slkali is 0.01-5mol/L.
6. the manufacture method of a kind of positive plate of iron phosphate lithium battery according to claim 5, is characterized in that: the concentration of described aqueous slkali is 0.2-5mol/L.
7. according to the manufacture method of a kind of positive plate of iron phosphate lithium battery described in any one in claim 1-4 and 6, it is characterized in that: the described time with aqueous slkali processing collector is 5-60 second.
8. the manufacture method of a kind of positive plate of iron phosphate lithium battery according to claim 5, is characterized in that: the described time with aqueous slkali processing collector is 5-60 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399831.7A CN103762337A (en) | 2011-12-06 | 2011-12-06 | Manufacturing method of positive plate of lithium iron phosphate cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110399831.7A CN103762337A (en) | 2011-12-06 | 2011-12-06 | Manufacturing method of positive plate of lithium iron phosphate cell |
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| Publication Number | Publication Date |
|---|---|
| CN103762337A true CN103762337A (en) | 2014-04-30 |
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| CN201110399831.7A Pending CN103762337A (en) | 2011-12-06 | 2011-12-06 | Manufacturing method of positive plate of lithium iron phosphate cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105931861A (en) * | 2016-06-14 | 2016-09-07 | 南京工程学院 | Preparation method for supercapacitor electrode coated with active electrode membrane |
-
2011
- 2011-12-06 CN CN201110399831.7A patent/CN103762337A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105931861A (en) * | 2016-06-14 | 2016-09-07 | 南京工程学院 | Preparation method for supercapacitor electrode coated with active electrode membrane |
| CN105931861B (en) * | 2016-06-14 | 2018-04-03 | 南京工程学院 | A kind of preparation method for the electrode of super capacitor for being covered with active electrode film |
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Application publication date: 20140430 |