CN106935804A - The preparation method and lithium ion battery of a kind of lithium titanate cathode size - Google Patents
The preparation method and lithium ion battery of a kind of lithium titanate cathode size Download PDFInfo
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- CN106935804A CN106935804A CN201511032558.9A CN201511032558A CN106935804A CN 106935804 A CN106935804 A CN 106935804A CN 201511032558 A CN201511032558 A CN 201511032558A CN 106935804 A CN106935804 A CN 106935804A
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- lithium titanate
- cathode size
- lithium
- decentralized processing
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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
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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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- 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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- 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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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The embodiment of the invention discloses a kind of preparation method of lithium titanate cathode size, for effectively reducing the bulky grain that slurry is agglomerated into, the dispersion effect of pulp particle is lifted, be coated with the flatness and battery performance of pole piece, it is to avoid sieving network blocking phenomenon occur.The embodiment of the present invention includes：Lithium titanate material is pre-processed, to remove the hydroxyl of remained on surface；Pretreated lithium titanate material is entered into decentralized processing；Conductive agent glue is added in lithium titanate material after decentralized processing, cathode size is obtained.The embodiment of the invention also discloses a kind of lithium ion battery.
Description
【Technical field】
The present invention relates to cell art, more particularly to a kind of lithium titanate cathode size preparation method and lithium
Ion battery.
【Background technology】
Spinel lithium titanate, as a kind of " zero strain " electrode material, is current lithium ion battery negative material
The focus of research.Lithium titanate as lithium ion battery negative material, with ionic conductance higher, and
Solid electrolyte interface film (SEI films) need not be formed during lithium ion battery first charge-discharge, so as to have
Energy conversion efficiency higher.Additionally, lithium titanate material wide material sources, clean environment firendly, in lithium ion battery
In be widely used.
But lithium titanate there is also some shortcomings, during cathode size is made using lithium titanate, slurry holds
Bulky grain easily is agglomerated into, it is difficult to disperse, network blocking, and coating pole piece is easily caused in sieving
It is coarse, influence battery performance.
【The content of the invention】
It is an object of the invention to provide the preparation method and lithium ion battery of a kind of lithium titanate cathode size, it is used for
The bulky grain that slurry is agglomerated into effectively is reduced, the dispersion effect of pulp particle is lifted, the smooth of pole piece is coated with
Degree and battery performance, it is to avoid sieving network blocking phenomenon occur.
To achieve these goals, the present invention provides a kind of preparation method of lithium titanate cathode size, including：
Lithium titanate material is pre-processed, to remove the hydroxyl of remained on surface；
Pretreated lithium titanate material is entered into decentralized processing；
Conductive agent glue is added in lithium titanate material after decentralized processing, cathode size is obtained.
Further, 2 kilograms of lithium titanate materials are added to the ammonium hydrogen carbonate that concentration is 4% to 5%
(NH4HCO3) stir 30-40 minutes in solution；
Adding ethanol carries out 1 to 2 washing to the lithium titanate material, and carries out high temperature drying after washing
Treatment.
Further, pretreated lithium titanate material and 3 kilograms of 1-METHYLPYRROLIDONEs (NMP) are added
Enter in polyvinylpyrrolidone (PVP) glue that concentration is 3% and be stirred, it is 40% to obtain solid amount
Lithium titanate emulsion；
The lithium titanate emulsion is filtered using 200 eye mesh screens, obtains preliminary slurry；
Kynoar (PVDF) glue is added in the preliminary slurry, with the preliminary slurry
Lithium titanate carries out decentralized processing.
Further, carbon black conductive agent (SP), graphite agent are added in the preliminary slurry after decentralized processing
(KS-6) and polyvinylpyrrolidone (PVP), to obtain the slurry that concentration is 10%；
By it is described obtain 10% slurry agitation 1 to 2 hour, obtain the cathode size that solid content is 45%.
Further, dispersant is added in lithium titanate material after the pre-treatment, to enter decentralized processing；
Wherein, the dispersant is Kynoar (PVDF), and the conductive agent includes carbon black conductive agent (SP)
With graphite agent (KS-6), and percentage by weight meets lithium titanate：Carbon black conductive agent：Graphite agent：
Kynoar=90:4:1:5.
The embodiment of the present invention also provide in lithium ion battery, the negative pole of the lithium ion battery includes claim 1
Lithium titanate cathode size any one of 5.
The preparation method and lithium ion battery of the lithium titanate cathode size that the present invention is provided, enter to lithium titanate material
Row pretreatment, eliminates the hydroxyl for remaining in surface, so as to avoid because the polymerization of hydroxyl causes slurry to be reunited
Form bulky grain, and avoid slurry caused by hydroxyl polymeric absorbed water in strong basicity caused by coating it is coarse,
After hydroxyl-removal is removed, decentralized processing is also carried out, so as to further lift the dispersion effect of pulp particle, make
The flatness and battery performance of pole piece are coated with the slurry, it is to avoid network blocking phenomenon occurs in sieving.
【Brief description of the drawings】
Fig. 1 is one embodiment schematic diagram of lithium titanate cathode size preparation method in embodiments of the invention；
Fig. 2 is another embodiment schematic diagram of lithium titanate cathode size preparation method in embodiments of the invention；
Fig. 3 is another embodiment schematic diagram of lithium titanate cathode size preparation method in embodiments of the invention；
Fig. 4 is lithium ion battery obtained in Fig. 2 and Fig. 3 embodiments and lithium ion battery is followed in the prior art
Ring curve comparison schematic diagram；
Fig. 5 a are that roller effect is illustrated using cathode size coating pole piece obtained in method of the present invention embodiment
Figure；
Fig. 5 b are to be coated with pole piece to roller effect diagram using cathode size of the prior art.
【Specific embodiment】
The preparation method and lithium ion battery of a kind of lithium titanate cathode size are the embodiment of the invention provides, is used for
The bulky grain that slurry is agglomerated into effectively is reduced, the dispersion effect of pulp particle is lifted, the smooth of pole piece is coated with
Degree and battery performance, it is to avoid sieving network blocking phenomenon occur.
In order that those skilled in the art more fully understand the present invention program, implement below in conjunction with the present invention
Accompanying drawing in example, is clearly and completely described, it is clear that institute to the technical scheme in the embodiment of the present invention
The embodiment of description is only the embodiment of a part of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the institute that those of ordinary skill in the art are obtained under the premise of creative work is not made
There is other embodiment, should all belong to the scope of protection of the invention.
Term " first ", " second " in description and claims of this specification and above-mentioned accompanying drawing etc. are (such as
Fruit is present) it is for distinguishing similar object, without for describing specific order or precedence.Should
The understanding so data for using can be exchanged in the appropriate case, so that the embodiments described herein can be with
Order in addition to the content for illustrating herein or describing is implemented.Additionally, term " comprising " and " having "
And their any deformation, it is intended that covering is non-exclusive to be included, for example, containing series of steps
Or the process of unit, method, system, product or equipment are not necessarily limited to those steps or the list clearly listed
Unit, but may include not listing clearly or intrinsic for these processes, method, product or equipment
Other steps or unit.
Refer to shown in Fig. 1, the embodiment of the invention provides a kind of preparation method of lithium titanate cathode size,
Specifically include：
101st, lithium titanate material is pre-processed, to remove the hydroxyl of remained on surface.
It should be noted that lithium titanate is in slurry preparation process, due to remained on surface lithium hydroxide (LiOH),
Lithium carbonate (LiCO3), cause the hydroxyl-OH groups on pulp particle surface to be mutually polymerized, bulky grain is formed, and
The slurry being configured to is unfavorable for coating, the present embodiment in alkalescence, easily water suction so that slurry is in g., jelly-like
In, during slurry is prepared, lithium titanate material is pre-processed, to remove the hydroxyl of remained on surface,
So as to avoid pulp particle from being polymerized and absorb water, so that the dispersion effect of pulp particle is lifted, coating pole piece
Flatness and battery performance, it is to avoid sieving network blocking phenomenon occur.
102nd, pretreated lithium titanate material is entered into decentralized processing.
In the embodiment of the present invention, the lithium titanate material gone after hydroxyl-removal carries out decentralized processing, can further be lifted
The dispersion effect of pulp particle.
103rd, conductive agent glue is added in the lithium titanate material after decentralized processing, cathode size is obtained.
It is understood that in the present embodiment, conductive agent is made into glue, lithium titanate material is then added to
In, being mixed using liquid liquid, dispersion is fast, good stability.
As shown in Fig. 2 in one embodiment, lithium titanate material is pre-processed, it is residual to remove surface
The hydroxyl for staying includes：
201st, 2 kilograms of lithium titanate materials are added to the ammonium hydrogen carbonate (NH that concentration is 4% to 5%4HCO3)
Stirred 30-40 minutes in solution；
202nd, adding ethanol carries out 1 to 2 washing to the lithium titanate material, and carries out high temperature after washing
Dried process.
Optionally, in embodiments of the present invention, pretreated lithium titanate material is entered into decentralized processing includes：
203rd, pretreated lithium titanate material and 3 kilograms of 1-METHYLPYRROLIDONEs (NMP) are added to
Concentration be 3% polyvinylpyrrolidone (PVP) glue in be stirred, obtain the metatitanic acid that solid amount is 40%
Lithium emulsion；
204th, the lithium titanate emulsion is filtered using 200 eye mesh screens, obtains preliminary slurry；
205th, Kynoar (PVDF) glue is added in the preliminary slurry, with to the preliminary slurry
Lithium titanate in material carries out decentralized processing.
Optionally, in embodiments of the present invention, conductive agent glue is added in the lithium titanate material after decentralized processing
Liquid, prepared cathode size includes：
206th, carbon black conductive agent (SP), graphite agent (KS-6) are added in the preliminary slurry after decentralized processing
With polyvinylpyrrolidone (PVP), to obtain the slurry that concentration is 10%；
207th, by it is described obtain 10% slurry agitation 1 to 2 hour, it is 45%, viscosity to obtain solid content
It is the cathode size of 5000 to 8000cp.
As shown in figure 3, in one embodiment, lithium titanate material is pre-processed, it is residual to remove surface
The hydroxyl for staying includes：
301st, 2 kilograms of lithium titanate materials are added to the ammonium hydrogen carbonate (NH that concentration is 4% to 5%4HCO3)
Stirred 30-40 minutes in solution；
302nd, adding ethanol carries out 1 to 2 washing to the lithium titanate material, and carries out high temperature after washing
Dried process.
Optionally, in embodiments of the present invention, pretreated lithium titanate material is entered into decentralized processing includes：
303rd, pretreated lithium titanate material and 3.2 kilograms of 1-METHYLPYRROLIDONEs (NMP) are added to
Concentration be 3% polyvinylpyrrolidone (PVP) glue in be stirred, obtain the metatitanic acid that solid amount is 40%
Lithium emulsion；
304th, the lithium titanate emulsion is filtered using 200 eye mesh screens, obtains preliminary slurry；
Kynoar (PVDF) glue is added in the preliminary slurry, with the preliminary slurry
Lithium titanate carries out decentralized processing.
Optionally, in embodiments of the present invention, conductive agent glue is added in the lithium titanate material after decentralized processing
Liquid, prepared cathode size includes：
305th, carbon black conductive agent (SP), graphite agent (KS-6) are added in the preliminary slurry after decentralized processing
With polyvinylpyrrolidone (PVP), to obtain the slurry that concentration is 10%；
306th, by it is described obtain 10% slurry agitation 1 to 2 hour, it is 45%, viscosity to obtain solid content
It is the cathode size of 5000 to 8000cp.
It should be noted that using the testability of the cathode size obtained by the corresponding embodiments of Fig. 2 and Fig. 3
Can, and be coated using the cathode size obtained by the corresponding embodiments of Fig. 2 and Fig. 3, what is obtained is negative
Pole constitutes capacity 32650-4.5Ah lithium ion batteries with identical positive plate respectively, tests the lithium ion battery
Performance, it is as shown in the table：
It should be noted that testing obtained two kinds of lithium ion batteries simultaneously and using electricity obtained in prior art
The cyclic curve in pond is as shown in Figure 4.
It should be noted that being coated using the cathode size obtained by the embodiment of the present invention and using existing
The effect that cathode size obtained in the method for technology is coated is as shown in figure 5 a and 5b.
Optionally, in another embodiment of the present invention, the dispersant is Kynoar (PVDF), institute
Stating conductive agent includes carbon black conductive agent (SP) and graphite agent (KS-6), and percentage by weight meets metatitanic acid
Lithium：Carbon black conductive agent：Graphite agent：Kynoar=90:4:1:5.
The embodiment of the present invention also provides a kind of lithium ion battery, and the lithium ion battery is implemented using the inventive method
Cathode size obtained by example is made.
The preparation method and lithium ion battery of the lithium titanate cathode size that the present invention is provided, enter to lithium titanate material
Row pretreatment, eliminates the hydroxyl for remaining in surface, so as to avoid because the polymerization of hydroxyl causes slurry to be reunited
Form bulky grain, and avoid slurry caused by hydroxyl polymeric absorbed water in strong basicity caused by coating it is coarse,
After hydroxyl-removal is removed, decentralized processing is also carried out, so as to further lift the dispersion effect of pulp particle, make
The flatness and battery performance of pole piece are coated with the slurry, it is to avoid network blocking phenomenon occurs in sieving.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail to the present invention with reference to the foregoing embodiments, and one of ordinary skill in the art should manage
Solution：It can still modify to the technical scheme described in foregoing embodiments, or to which part
Technical characteristic carries out equivalent；And these modifications or replacement, take off the essence of appropriate technical solution
From the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a kind of preparation method of lithium titanate cathode size, it is characterised in that including：
Lithium titanate material is pre-processed, to remove the hydroxyl of remained on surface；
Pretreated lithium titanate material is entered into decentralized processing；
Conductive agent glue is added in lithium titanate material after decentralized processing, cathode size is obtained.
2. the preparation method of lithium titanate cathode size according to claim 1, it is characterised in that described
Lithium titanate material is pre-processed, is included with the hydroxyl for removing remained on surface：
2 kilograms of lithium titanate materials are added to the ammonium hydrogen carbonate (NH that concentration is 4% to 5%4HCO3) solution
Middle stirring 30-40 minutes；
Adding ethanol carries out 1 to 2 washing to the lithium titanate material, and carries out high temperature drying after washing
Treatment.
3. the preparation method of lithium titanate cathode size according to claim 2, it is characterised in that described
Pretreated lithium titanate material is entered into decentralized processing includes：
Pretreated lithium titanate material and 3 kilograms of 1-METHYLPYRROLIDONEs (NMP) are added into concentration is
It is stirred in 3% polyvinylpyrrolidone (PVP) glue, obtains the lithium titanate emulsion that solid amount is 40%；
The lithium titanate emulsion is filtered using 200 eye mesh screens, obtains preliminary slurry；
Kynoar (PVDF) glue is added in the preliminary slurry, with the preliminary slurry
Lithium titanate carries out decentralized processing.
4. the preparation method of the lithium titanate cathode size according to right 3, it is characterised in that it is described point
Addition conductive agent glue in the lithium titanate material after treatment is dissipated, cathode size bag is obtained：
In preliminary slurry after decentralized processing add carbon black conductive agent (SP), graphite agent (KS-6) and
Polyvinylpyrrolidone (PVP), to obtain the slurry that concentration is 10%；
By it is described obtain 10% slurry agitation 1 to 2 hour, it is 50% to obtain solid content, and viscosity is 5000
To the cathode size of 8000cp.
5. the preparation method of lithium titanate cathode size according to claim 1, it is characterised in that described
Pretreated lithium titanate material is entered into decentralized processing includes：
Dispersant is added in lithium titanate material after the pre-treatment, to enter decentralized processing；
Wherein, the dispersant is Kynoar (PVDF), and the conductive agent includes carbon black conductive agent (SP)
With graphite agent (KS-6), and percentage by weight meets lithium titanate：Carbon black conductive agent：Graphite agent：
Kynoar=90:4:1:5.
6. a kind of lithium ion battery, it is characterised in that the negative pole of the lithium ion battery includes claim 1
Lithium titanate cathode size any one of 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511032558.9A CN106935804A (en) | 2015-12-31 | 2015-12-31 | The preparation method and lithium ion battery of a kind of lithium titanate cathode size |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511032558.9A CN106935804A (en) | 2015-12-31 | 2015-12-31 | The preparation method and lithium ion battery of a kind of lithium titanate cathode size |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185126A (en) * | 2011-03-23 | 2011-09-14 | 中信国安盟固利动力科技有限公司 | Method for dispersing micro-scale and nano-scale electrode materials |
| CN104659334A (en) * | 2015-02-02 | 2015-05-27 | 湖北金泉新材料有限责任公司 | Lithium ion battery slurry, and preparation method and application of lithium ion battery slurry |
| CN104681306A (en) * | 2014-12-12 | 2015-06-03 | 宁波南车新能源科技有限公司 | Preparation method for mixed capacitor cathode pulp |
-
2015
- 2015-12-31 CN CN201511032558.9A patent/CN106935804A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185126A (en) * | 2011-03-23 | 2011-09-14 | 中信国安盟固利动力科技有限公司 | Method for dispersing micro-scale and nano-scale electrode materials |
| CN104681306A (en) * | 2014-12-12 | 2015-06-03 | 宁波南车新能源科技有限公司 | Preparation method for mixed capacitor cathode pulp |
| CN104659334A (en) * | 2015-02-02 | 2015-05-27 | 湖北金泉新材料有限责任公司 | Lithium ion battery slurry, and preparation method and application of lithium ion battery slurry |
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Application publication date: 20170707 |