CN102054977A - Method for manufacturing positive plate of lithium iron phosphate battery - Google Patents
Method for manufacturing positive plate of lithium iron phosphate battery Download PDFInfo
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- CN102054977A CN102054977A CN2010102900641A CN201010290064A CN102054977A CN 102054977 A CN102054977 A CN 102054977A CN 2010102900641 A CN2010102900641 A CN 2010102900641A CN 201010290064 A CN201010290064 A CN 201010290064A CN 102054977 A CN102054977 A CN 102054977A
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- iron phosphate
- lithium iron
- positive plate
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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
Abstract
The invention relates to the field of lithium ion batteries, and discloses a method for manufacturing a positive plate of a lithium iron phosphate battery, which comprises a slurry preparation process and a coating process, wherein lithium iron phosphate positive materials adopted in the slurry preparation process are preprocessed by the following method: more than two types of lithium iron phosphate positive materials with different lithium iron phosphate main component contents are uniformly mixed for 2 to 10 hours in a mode of ball milling, superfine grinding, planet ball milling, sanding or vibrational milling. The method effectively solves the common problems that the plate is difficult to coat, the prepared battery cell or battery loses materials and the like in the prior art, and can improve lithium iron phosphate material coating performance and improve compacted density so as to improve the electrochemical performance of the battery.
Description
Technical field
The present invention relates to the lithium ion battery field, be specially the manufacture method that relates to a kind of positive plate of iron phosphate lithium battery.
Background technology
LiFePO
4Positive electrode is the novel anode material for lithium ion battery of a class.LiFePO
4Have high energy density, cheap price, excellent security makes it be specially adapted to electrokinetic cell.Its appearance is an important breakthrough of lithium ion battery material, a kind of thereby to continue to remain batch stable, ion and the not good charge-discharge magnification performance that causes of electronic conductivity not good but ferric phosphate lithium cell is because its raw material active material also is at present, influenced the popularization of present ferric phosphate lithium cell greatly.
Along with the proposition of low-carbon (LC) pattern and universal widely, require urgent day by day and needs for new forms of energy.Ferric phosphate lithium cell in the lithium ion battery must will be widely used in every field such as hybrid vehicle, electric tool, electric bicycle, Moped Scooter, generating and energy storage device as a kind of novel energy battery.Hybrid vehicle (HEV) be over the next several years in the main developing direction of new-energy automobile.Along with the continuous increase of hybrid vehicle output, the lifting of hybrid vehicle occupation rate, the ferric phosphate lithium cell market scale will increase fast, estimate that hybrid vehicle using lithium iron phosphate Battery Market scale in 2010 is above hundred billion yuan.
Along with research is goed deep into, increase the conductivity that specific area can effectively be improved battery, but the same required bonding agent and the amount of solvent for use can improve pole piece coating processes intractable greatly.And after making electric core or battery, the material phenomenon appears falling easily.At present, ubiquity this problem during lithium iron phosphate battery pole piece was made.Such as publication number is reported method such as CN101197439A, CN101699642A, first coating processes complexity, and it two is to occur falling the material phenomenon easily.
Summary of the invention
Problems such as material appear falling in the electric core or the battery that apply difficulty, preparation at ubiquitous pole piece in the above-mentioned prior art, a kind ofly can improve the LiFePO 4 material paintability, improve the manufacture method of positive plate of iron phosphate lithium battery that compacted density is improved the chemical property of battery thereby the purpose of this invention is to provide.
Goal of the invention of the present invention is to be achieved through the following technical solutions:
A kind of manufacture method of positive plate of iron phosphate lithium battery comprises the slip preparation and applies operation, and wherein: the lithium iron phosphate positive material that adopts in the described slip preparation section carries out preliminary treatment as follows:
The two or more lithium iron phosphate positive materials that principal component LiFePO4 content is different evenly mix, and the mode of ball milling, ultra-fine mill, planetary mills, sand milling or vibration is adopted in described even mixing, and the mixed uniformly time is 2-10 hour.
The inventor discovers, adopt the method for the present invention lithium iron phosphate positive material that principal component LiFePO4 content is different by evenly mixing, lithium iron phosphate positive material is carried out granularity adjustment and surface preparation, can effectively improve the solid content and the viscosity of slip after the mixed processing, thereby improved the paintability of slip, the compacted density of further having improved positive plate has improved the capacity density in the positive plate unit volume, test also shows that the positive plate of iron phosphate lithium battery that pretreated lithium iron phosphate positive material interpolation conductive agent and binding agent are made into has improved the dry linting problem, has more excellent chemical property.
As preferred version, according to the manufacture method of positive plate of iron phosphate lithium battery of the present invention, wherein, the principal component LiFePO4 content of described lithium iron phosphate positive material is between 92%-98%.The inventor discovers that in the method for the present invention, anode active material of phosphate iron lithium content can be realized the object of the invention more than 92%; And LiFePO4 content surpasses after 98%, and the positive electrode difference is little, can't realize the preliminary treatment between the different positive electrodes truly.
As preferred version, according to the manufacture method of positive plate of iron phosphate lithium battery of the present invention, wherein, any two kinds of mixed of pressing 1:5～5:1 of described lithium iron phosphate positive material.
As preferred version, according to the manufacture method of positive plate of iron phosphate lithium battery of the present invention, wherein, the mode of ball milling, planetary mills or vibration is adopted in described even mixing.Why preferably the mode of planetary mills, vibration or ball milling is because these three kinds of modes can be in the solid-state adjustment of carrying out the granularity and the specific area of material down simultaneously.
As preferred version, according to the manufacture method of positive plate of iron phosphate lithium battery of the present invention, wherein, the described mixed uniformly time is 3-6 hour.Can be beneficial to the control production process reasonably realizing the object of the invention in the time.
Compared with prior art, the present invention has the following advantages:
The present invention mixes solid content and viscosity that pretreated active matter mass-energy is effectively improved slip by the preliminary treatment to the active compound lithium iron phosphate positive electrode, improves paintability with this; Thereby can improve the capacity density in the compacted density raising unit volume; Can effectively improve the battery make efficiency, can reduce simultaneously be made into produced behind electric core or the battery the material problem, help improving the gram volume and the multiplying power property of the battery of doing.Helping ferric phosphate lithium cell is applied in the new forms of energy low-carbon (LC) industry field faster.
Description of drawings
Fig. 1 is the charging and discharging curve figure of the embodiment of the invention 1 battery.
Fig. 2 is the charging and discharging curve figure of the embodiment of the invention 2 batteries.
Fig. 3 is the charging and discharging curve figure of the embodiment of the invention 3 batteries.
Fig. 4 is the charging and discharging curve figure of Comparative Examples 1 battery of the present invention.
Embodiment
Below in conjunction with embodiment, be described more specifically content of the present invention.Should be appreciated that enforcement of the present invention is not limited to the following examples, all will fall into protection range of the present invention any pro forma accommodation and/or the change that the present invention made.
In the present invention, if not refer in particular to, all equipment and raw material etc. all can be buied from market or the industry is commonly used.Method among the following embodiment if no special instructions, is the conventional method of this area.
Embodiment 1:
LiFePO4 content is respectively two kinds of lithium iron phosphate positive materials of 92% and 95% weight ratio proportioning by 1:2,700g mixed 3 hours in planetary ball mill altogether, obtain the preliminary treatment material, adding 33 gram sp(then is carbon black) conductive agent, in de-airing mixer (atmospheric pressure-0.1mpa) continue to mix 2 hours, the mixture that obtains add viscosity that 1000g is pre-mixed at 10000mPas with interior binding agent 1013 slurries, in de-airing mixer (atmospheric pressure-0.1mpa) continue to mix 6 hours, obtain the lithium iron phosphate positive material slip.The lithium iron phosphate positive material slip of gained is made surface density after applying operation be 110g/m
2Positive plate, then with double roll press compacting and postmenstruation cell making process make battery.
The battery that present embodiment obtains carries out electrochemical property test, and its testing result sees Table 1 and Fig. 1.
Embodiment 2
LiFePO4 content is respectively three kinds of lithium iron phosphate positive materials of 92%, 95% and 97% weight ratio proportioning by 1:5:1,700g mixed 3 hours in ball mill altogether, obtain the preliminary treatment material, adding 33 gram sp(then is carbon black) conductive agent, in de-airing mixer (atmospheric pressure-0.1mpa) continue to mix 2 hours, the mixture that obtains add viscosity that 1000g is pre-mixed at 10000mPas with interior binding agent 1013 slurries, in de-airing mixer (atmospheric pressure-0.1mpa) continue to mix 6 hours, obtain the lithium iron phosphate positive material slip.The lithium iron phosphate positive material slip of gained is made surface density after applying operation be 110g/m
2Positive plate, then with double roll press compacting and postmenstruation cell making process make battery.
The battery that present embodiment obtains carries out electrochemical property test, and its testing result sees Table 1 and Fig. 2.
Embodiment 3
LiFePO4 content is respectively 92%, three kinds of lithium iron phosphate positive materials of 95% and 98% are pressed the weight ratio proportioning of 1:4:1,700g mixed 3 hours in oscillating mill altogether, obtain the preliminary treatment material, adding 33 gram sp(then is carbon black) conductive agent, in de-airing mixer (atmospheric pressure-0.1mpa) continue to mix 2 hours, the mixture that obtains add viscosity that 1000g is pre-mixed at 10000mPas with interior binding agent 1013 slurries, in de-airing mixer (atmospheric pressure-0.1mpa) continue to mix 6 hours, obtain the lithium iron phosphate positive material slip.The lithium iron phosphate positive material slip of gained is made surface density after applying operation be 110g/m
2Positive plate, then with double roll press compacting and postmenstruation cell making process make battery.
The battery that present embodiment obtains carries out electrochemical property test, and its testing result sees Table 1 and Fig. 3.
Comparative Examples 1
At first the viscosity that is pre-mixed 10000mPas with interior bonding agent 1013 slurry 1000g in, adding 33 gram sp conductive agents mixed 2 hours, add monomer lithium iron phosphate positive material 700g then, continue to mix 8 hours, the gained slip is made surface density after applying operation be 110g/m
2Positive plate, then with double roll press compacting and postmenstruation cell making process make battery.
The battery that this Comparative Examples obtains carries out electrochemical property test, and its testing result sees Table 1 and Fig. 4.
The battery performance test result of table 1 embodiment and Comparative Examples
| Discharge-rate | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative Examples 1 |
| 0.2C(mah/g) | 144.03 | 144.89 | 145.91 | 134.42 |
| 1C(mah/g) | 132.84 | 132.26 | 133.87 | 128.89 |
In the embodiment of the invention operating process, the dry linting phenomenon do not occur, improved the LiFePO 4 material paintability, by table 1 also as can be seen, the present invention has further improved battery capacity, has improved the capacity density in the positive plate unit volume, has more excellent chemical property.
Above preferred embodiment just is used for description and interpretation content of the present invention, does not constitute the restriction to content of the present invention.Although the inventor has done in more detail the present invention and has enumerated, but, the content that those skilled in the art is disclosed according to summary of the invention part and embodiment, can make various modifications or/and to replenish or adopt similar mode to substitute be obvious to described specific embodiment, and can realize technique effect of the present invention, therefore, give unnecessary details no longer one by one herein.The term that occurs among the present invention is used for the elaboration of technical solution of the present invention and understanding are not construed as limiting the invention.
Claims (7)
1. the manufacture method of a positive plate of iron phosphate lithium battery comprises the slip preparation and applies operation, and it is characterized in that: the lithium iron phosphate positive material that adopts in the described slip preparation section carries out preliminary treatment as follows:
The two or more lithium iron phosphate positive materials that principal component LiFePO4 content is different evenly mix, and the mode of ball milling, ultra-fine mill, planetary mills, sand milling or vibration is adopted in described even mixing, and the mixed uniformly time is 2-10 hour.
2. the manufacture method of positive plate of iron phosphate lithium battery according to claim 1 is characterized in that, the principal component LiFePO4 content of described lithium iron phosphate positive material is between 92%-98%.
3. the manufacture method of positive plate of iron phosphate lithium battery according to claim 1 and 2 is characterized in that, any two kinds of mixed of pressing 1:5～5:1 of described lithium iron phosphate positive material.
4. the manufacture method of positive plate of iron phosphate lithium battery according to claim 1 and 2 is characterized in that, the mode of ball milling, planetary mills or vibration is adopted in described even mixing.
5. the manufacture method of positive plate of iron phosphate lithium battery according to claim 3 is characterized in that, the mode of ball milling, planetary ball mill or vibration is adopted in described even mixing.
6. the manufacture method of positive plate of iron phosphate lithium battery according to claim 1 and 2 is characterized in that, the described mixed uniformly time is 3-6 hour.
7. the manufacture method of positive plate of iron phosphate lithium battery according to claim 5 is characterized in that, the described mixed uniformly time is 3-6 hour.
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| CN2010102900641A CN102054977B (en) | 2010-09-25 | 2010-09-25 | Method for manufacturing positive plate of lithium iron phosphate battery |
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| CN2010102900641A CN102054977B (en) | 2010-09-25 | 2010-09-25 | Method for manufacturing positive plate of lithium iron phosphate battery |
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| CN102054977A true CN102054977A (en) | 2011-05-11 |
| CN102054977B CN102054977B (en) | 2013-03-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107275608A (en) * | 2017-06-16 | 2017-10-20 | 安化县泰森循环科技有限公司 | A kind of technique for preparing high-pressure solid LiFePO4C composites |
| CN109336079A (en) * | 2018-11-20 | 2019-02-15 | 浙江瑞邦科技有限公司 | A kind of preparation method of high-pressure solid LiFePO 4 material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087017A (en) * | 2006-09-08 | 2007-12-12 | 长沙理工大学 | Anode slice of high-power and large-capacity lithium ion battery and its making method |
| CN101197442A (en) * | 2006-12-08 | 2008-06-11 | 中南大学 | Lithium iron phosphate lithium ion battery |
| CN101409366A (en) * | 2008-11-19 | 2009-04-15 | 江苏双登集团有限公司 | Method for manufacturing gel polymer lithium ion battery |
-
2010
- 2010-09-25 CN CN2010102900641A patent/CN102054977B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087017A (en) * | 2006-09-08 | 2007-12-12 | 长沙理工大学 | Anode slice of high-power and large-capacity lithium ion battery and its making method |
| CN101197442A (en) * | 2006-12-08 | 2008-06-11 | 中南大学 | Lithium iron phosphate lithium ion battery |
| CN101409366A (en) * | 2008-11-19 | 2009-04-15 | 江苏双登集团有限公司 | Method for manufacturing gel polymer lithium ion battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107275608A (en) * | 2017-06-16 | 2017-10-20 | 安化县泰森循环科技有限公司 | A kind of technique for preparing high-pressure solid LiFePO4C composites |
| CN109336079A (en) * | 2018-11-20 | 2019-02-15 | 浙江瑞邦科技有限公司 | A kind of preparation method of high-pressure solid LiFePO 4 material |
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| CN102054977B (en) | 2013-03-27 |
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Denomination of invention: Production method for positive plate of iron phosphate lithium battery Effective date of registration: 20200708 Granted publication date: 20130327 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: Hengdian Group DMEGC Magnetic Ltd. Registration number: Y2020330000459 |
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Date of cancellation: 20220110 Granted publication date: 20130327 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Registration number: Y2020330000459 |