CN103247779A - Production method of electrochemical active pole piece - Google Patents
Production method of electrochemical active pole piece Download PDFInfo
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- CN103247779A CN103247779A CN2013101319058A CN201310131905A CN103247779A CN 103247779 A CN103247779 A CN 103247779A CN 2013101319058 A CN2013101319058 A CN 2013101319058A CN 201310131905 A CN201310131905 A CN 201310131905A CN 103247779 A CN103247779 A CN 103247779A
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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
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- 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 a production method of an electrochemical active pole piece, and in particular relates to a production method of an electrochemical active pole piece suitable for a lithium ion battery. The electrochemical active pole piece comprises a current collector with an ordered three-dimensional hole structure, an electrode active material and an insulation diaphragm, wherein a, the current collector can be filled and coated with more electrode active materials; b, the electrode active material is filled and coated on the current collector and forms a space network structure with the three-dimensional hole of the current collector; and c, the insulation diaphragm covers two sides of the active pole piece, the tensile strength of the pole piece can be improved, and the active material can be effectively protected. According to the electrochemical pole piece which is prepared by the production method, not only can the conductivity and the heat radiation property of the electrode be remarkably improved, but also the surface density of the electrode material and the strength of the pole piece can be obviously improved, the energy density, and the multiplying charging and discharging capacities of a finished product lithium-ion battery can be improved, and the cycling service life of the finished product lithium-ion battery can be prolonged.
Description
Technical field
The present invention relates to lithium ion battery, be specially a kind of preparation method who is applicable to the electro-chemical activity pole piece of lithium ion battery.
Background technology
Released commercialization lithium ion battery product first from 1991, the lithium ion battery development is the history in existing 20 years so far.Compare advantage such as lithium ion battery has the open circuit voltage height, has extended cycle life, energy density height, self discharge are low, environmentally friendly with other kind batteries.At present, lithium ion battery has been widely used in portable digital products such as mobile phone, camera, notebook computer.
Current, vigorously advocating under the background of green energy resource, for adapting to the development in electric automobile and energy storage field, need develop the more lithium ion battery of high-energy-density, power density, cycle-index and fail safe.Yet, be subject to structure and the electrolytical performance of electrode material, the power-performance of lithium ion battery relatively a little less than, at power lithium-ion battery, this point shows particularly outstandingly.Thereby how improving the power density of lithium ion battery and further increasing its energy density is the focus of current research, also is difficult point simultaneously.And be one of effective way that solves this difficult point by the electrode material that technological innovation and technological design preparation has high-energy-density, high rate capability and a cyclical stability.
Studies show that the specific area of Graphene superelevation and good electric property thereof have determined its great potential as lithium ion battery electrode material.Thereby, how rationally to utilize prior art, technology effectively to coordinate the arrangement of Graphene and electrode active material and composite, making it form good electron will be the key of structure high performance electrode material with the ion transfer passage.
Summary of the invention
Technical problem solved by the invention is to provide a kind of manufacture method of electro-chemical activity pole piece, to solve the shortcoming in the above-mentioned background technology.
Technical problem solved by the invention realizes by the following technical solutions:
A kind of manufacture method of electro-chemical activity pole piece, described electro-chemical activity pole piece comprises porous collector, active coating and thin layer, described porous collector has orderly three-D pore structure, active coating is filled and is covered on the porous collector, thin layer is the porous film that covers active pole piece both sides, and its preparation technology may further comprise the steps:
A. the ultrasonic cleaning of porous collector is clean, drying for standby;
B. taking by weighing an amount of decentralized medium, binding agent, conductive agent and active material by a certain percentage joins in the finely dispersed graphene suspension successively, be made into slurry in high shear forces, ball milling obtains finely dispersed Graphene/active material combination electrode slurry then, and is stand-by;
C. then above-mentioned combination electrode slurry is coated on the porous collector that cleans up infra-red drying;
D. porous film layer on the coating on both sides of above-mentioned active pole piece, roll-in then namely obtains a kind of electro-chemical activity pole piece that is applicable to lithium ion battery.
In the present invention, the ratio of each component is active material according to weight in the described combination electrode slurry: conductive agent: binding agent: decentralized medium=100: (0.5～1.5): 3: (125～130).
In the present invention, the orderly three-D pore structure of described porous collector is the regularly arranged three-D pore structure of square hole, circular hole or square hole and circular hole.
In the present invention, described active coating adopts electrode active material, and active material is one or more in LiMn2O4, LiFePO4, cobalt acid lithium, the ternary material.
In the present invention, described conductive agent is one or more in carbon black, acetylene black, the conductive carbon fibre.
In the present invention, described binding agent is Kynoar (PVDF).
In the present invention, described decentralized medium is the derivative of 2-Pyrrolidone class, adopts N-N-methyl-2-2-pyrrolidone N-or N-vinyl-2-Pyrrolidone more.
In the present invention, the film of described thin layer adopts one or more in polyolefin, polystyrene, polyester, the Merlon.
Beneficial effect: the present invention has the following advantages:
(1) collector has unique orderly three-D pore structure, can fill and apply more electrode active material, has improved the surface density of electrode material;
(2) three-dimension hole of Graphene and collector constitutes space conductive network structure, has improved the conductivity of electrode active material, has reduced electrode impedance;
(3) pore structure of electro-chemical activity pole piece is conducive to electrolyte solution " mass transfer ";
(4) the porous insulation film of electro-chemical activity pole piece coating on both sides can improve the hot strength of pole piece and effectively protect active material.
Compared with prior art, the prepared electro-chemical activity pole piece of the present invention can not only significantly improve pole piece conduction, heat conductivility, is conducive to " mass transfer " of electrolyte solution, effectively reduces the internal resistance of cell; And obviously improve the surface density of electrode material and the intensity of pole piece, improve battery rate charge-discharge ability and cycle life.
Description of drawings
Fig. 1 is the SEM photo of porous collector among the present invention.
Fig. 2 is the amplification SEM photo of porous collector among the present invention
Fig. 3 is the SEM photo of electro-chemical activity pole piece among the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with example, the present invention is further set forth.
Embodiment 1
To have orderly three-dimensional square hole, the regularly arranged aluminum foil current collector of circular hole places ultrasonic tank to clean 15min, drying for standby.Then, ratio in 100,0.5,3,125 takes by weighing LiFePO4, carbon black, Kynoar, N-N-methyl-2-2-pyrrolidone N-, join successively in finely dispersed 1% the graphene suspension, ultrasonic dispersion 30min, high speed shear 30min is made into slurry then, ball milling 15min obtains finely dispersed Graphene/active material combination electrode slurry then.Then, above-mentioned combination electrode slurry is coated on the collector of clean three-dimensional square hole structure infra-red drying.Porous film layer on the coating on both sides of active pole piece then, the pole piece print that is used for lithium ion battery of 360mm * 180mm * 2mm is made in roll-in then.
Fig. 1,2 is the SEM photo of porous collector and corresponding electro-chemical activity pole piece.As can be seen, the loose structure of this collector be orderly three-dimensional square hole, circular hole alternately, regularly arranged, its pore size～150 μ m; Corresponding active material is filled in the three-dimension hole of collector and is coated in collection liquid surface, surfacing.
Embodiment 2
The aluminum foil current collector that will have orderly three-dimensional square hole structure places ultrasonic tank to clean 15min, drying for standby.Then, ratio in 100,1.5,3,130 takes by weighing LiFePO4, carbon black, Kynoar, N-N-methyl-2-2-pyrrolidone N-, join successively in finely dispersed 0.5% the graphene suspension, ultrasonic dispersion 30min, high speed shear 30min is made into slurry then, ball milling 15min obtains finely dispersed Graphene/active material combination electrode slurry then.Then, above-mentioned combination electrode slurry is coated on the collector of clean three-dimensional square hole structure infra-red drying.Porous film layer on the coating on both sides of active pole piece then, the pole piece print that is used for lithium ion battery of 360mm * 180mm * 2mm is made in roll-in then.
Embodiment 3
The aluminum foil current collector that will have orderly three-dimensional borehole structure places ultrasonic tank to clean 15min, drying for standby.Then, ratio in 100,1,3,125 takes by weighing LiFePO4, carbon black, Kynoar, N-N-methyl-2-2-pyrrolidone N-, join successively in finely dispersed 1% the graphene suspension, ultrasonic dispersion 30min, high speed shear 30min is made into slurry then, ball milling 15min obtains finely dispersed Graphene/active material combination electrode slurry then.Then, above-mentioned combination electrode slurry is coated on the collector of clean three-dimensional square hole structure infra-red drying.Porous film layer on the coating on both sides of active pole piece then, the pole piece print that is used for lithium ion battery of 360mm * 180mm * 2mm is made in roll-in then.
Embodiment 4
The aluminum foil current collector that will have orderly three-dimensional borehole structure places ultrasonic tank to clean 15min, drying for standby.Then, ratio in 100,1.5,3,125 takes by weighing LiMn2O4, acetylene black, Kynoar, N-N-methyl-2-2-pyrrolidone N-, join successively in finely dispersed 0.5% the graphene suspension, ultrasonic dispersion 30min, high speed shear 30min is made into slurry then, ball milling 15min obtains finely dispersed Graphene/active material combination electrode slurry then.Then, above-mentioned combination electrode slurry is coated on the collector of clean three-dimensional square hole structure infra-red drying.Porous film layer on the coating on both sides of active pole piece then, the pole piece print that is used for lithium ion battery of 360mm * 180mm * 2mm is made in roll-in then.
Embodiment 5
The aluminum foil current collector that will have orderly three-dimensional circumference pore structure places ultrasonic tank to clean 15min, drying for standby.Then, ratio in 100,1,3,125 takes by weighing cobalt acid lithium, carbon black, Kynoar, N-N-methyl-2-2-pyrrolidone N-, join successively in finely dispersed 0.75% the graphene suspension, ultrasonic dispersion 30min, high speed shear 30min is made into slurry then, ball milling 15min obtains finely dispersed Graphene/active material combination electrode slurry then.Then, above-mentioned combination electrode slurry is coated on the collector of clean three-dimensional square hole structure infra-red drying.Porous film layer on the coating on both sides of active pole piece then, the pole piece print that is used for lithium ion battery of 360mm * 180mm * 2mm is made in roll-in then.
Embodiment 6
Place ultrasonic tank to clean 15min, drying for standby the collector of three-dimensional square hole structure.Then, ratio in 100,1.2,3,130 takes by weighing ternary material, conduction charcoal fiber, Kynoar, N-N-methyl-2-2-pyrrolidone N-, join successively in finely dispersed 1% the graphene suspension, ultrasonic dispersion 30min, high speed shear 30min is made into slurry then, ball milling 15min obtains finely dispersed Graphene/active material combination electrode slurry then.Then, above-mentioned combination electrode slurry is coated on the collector of clean three-dimensional square hole structure infra-red drying.Porous film layer on the coating on both sides of active pole piece then, the pole piece print that is used for lithium ion battery of 360mm * 180mm * 2mm is made in roll-in then.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (8)
1. the manufacture method of an electro-chemical activity pole piece, it is characterized in that, described electro-chemical activity pole piece comprises porous collector, active coating and thin layer, described porous collector has orderly three-D pore structure, active coating is filled and is covered on the porous collector, thin layer is the porous film that covers active pole piece both sides, and its preparation technology may further comprise the steps:
A. the ultrasonic cleaning of porous collector is clean, drying for standby;
B. taking by weighing an amount of decentralized medium, binding agent, conductive agent and active material by a certain percentage joins in the finely dispersed graphene suspension successively, be made into slurry in high shear forces, ball milling obtains finely dispersed Graphene/active material combination electrode slurry then, and is stand-by;
C. then above-mentioned combination electrode slurry is coated on the porous collector that cleans up infra-red drying;
D. porous film layer on the coating on both sides of above-mentioned active pole piece, roll-in then namely obtains a kind of electro-chemical activity pole piece that is applicable to lithium ion battery.
2. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1, it is characterized in that the ratio of each component is active material according to weight in the described combination electrode slurry: conductive agent: binding agent: decentralized medium=100: (0.5～1.5): 3: (125～130).
3. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1 is characterized in that, the orderly three-D pore structure of described porous collector is the regularly arranged three-D pore structure of square hole, circular hole or square hole and circular hole.
4. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1 is characterized in that, described active coating adopts electrode active material, and active material is one or more in LiMn2O4, LiFePO4, cobalt acid lithium, the ternary material.
5. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1 is characterized in that, described conductive agent is one or more in carbon black, acetylene black, the conductive carbon fibre.
6. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1 is characterized in that, described binding agent is Kynoar.
7. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1 is characterized in that, described decentralized medium is the derivative of 2-Pyrrolidone class.
8. the manufacture method of a kind of electro-chemical activity pole piece according to claim 1 is characterized in that, the film of described thin layer adopts one or more in polyolefin, polystyrene, polyester, the Merlon.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413917A (en) * | 2013-08-19 | 2013-11-27 | 济宁利特纳米技术有限责任公司 | Preparation method of graphene-containing lithium manganate positive pole piece |
| CN104241606A (en) * | 2014-09-09 | 2014-12-24 | 海门容汇通用锂业有限公司 | Preparation method of lithium iron phosphate positive plate with high rate and superior low-temperature performance |
| CN107108225A (en) * | 2014-10-10 | 2017-08-29 | 东丽株式会社 | Graphene powder, lithium ion battery are with electrode paste and lithium ion battery electrode |
| US9978535B2 (en) | 2015-11-03 | 2018-05-22 | Cyntec Co., Ltd. | Reduction of leakage current from supercapacitor by modifying electrode material |
| CN108511681A (en) * | 2017-12-11 | 2018-09-07 | 吉安市优特利科技有限公司 | Electrode slice and preparation method thereof and battery |
| CN109802142A (en) * | 2019-01-25 | 2019-05-24 | 浙江大学 | A kind of porous copper foil of lithium ion battery |
| CN112018397A (en) * | 2020-09-21 | 2020-12-01 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| CN113506877A (en) * | 2021-05-12 | 2021-10-15 | 上海大学 | High-energy-density microporous lithium battery electrode and preparation method thereof |
| CN114220943A (en) * | 2021-12-20 | 2022-03-22 | 远景动力技术(江苏)有限公司 | Sandwich structure pole piece and production system device thereof |
| WO2023216703A1 (en) * | 2022-05-07 | 2023-11-16 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, preparation method therefor, and related device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413917A (en) * | 2013-08-19 | 2013-11-27 | 济宁利特纳米技术有限责任公司 | Preparation method of graphene-containing lithium manganate positive pole piece |
| CN103413917B (en) * | 2013-08-19 | 2015-09-23 | 济宁利特纳米技术有限责任公司 | The preparation method of the lithium manganate cathode pole piece containing Graphene |
| CN104241606A (en) * | 2014-09-09 | 2014-12-24 | 海门容汇通用锂业有限公司 | Preparation method of lithium iron phosphate positive plate with high rate and superior low-temperature performance |
| CN107108225A (en) * | 2014-10-10 | 2017-08-29 | 东丽株式会社 | Graphene powder, lithium ion battery are with electrode paste and lithium ion battery electrode |
| US9978535B2 (en) | 2015-11-03 | 2018-05-22 | Cyntec Co., Ltd. | Reduction of leakage current from supercapacitor by modifying electrode material |
| CN106653383B (en) * | 2015-11-03 | 2018-08-21 | 乾坤科技股份有限公司 | Composite material, the method and super capacitor that electrode unit is made using it |
| CN108511681A (en) * | 2017-12-11 | 2018-09-07 | 吉安市优特利科技有限公司 | Electrode slice and preparation method thereof and battery |
| CN108511681B (en) * | 2017-12-11 | 2024-04-09 | 吉安市优特利科技有限公司 | Electrode plate, preparation method thereof and battery |
| CN109802142A (en) * | 2019-01-25 | 2019-05-24 | 浙江大学 | A kind of porous copper foil of lithium ion battery |
| CN112018397A (en) * | 2020-09-21 | 2020-12-01 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| CN113506877A (en) * | 2021-05-12 | 2021-10-15 | 上海大学 | High-energy-density microporous lithium battery electrode and preparation method thereof |
| CN114220943A (en) * | 2021-12-20 | 2022-03-22 | 远景动力技术(江苏)有限公司 | Sandwich structure pole piece and production system device thereof |
| CN114220943B (en) * | 2021-12-20 | 2024-03-29 | 远景动力技术(江苏)有限公司 | Sandwich structure pole piece and production system device thereof |
| WO2023216703A1 (en) * | 2022-05-07 | 2023-11-16 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, preparation method therefor, and related device |
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Application publication date: 20130814 |