CN101887970B - Preparation method of lithium-ion secondary battery positive plate - Google Patents
Preparation method of lithium-ion secondary battery positive plate Download PDFInfo
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- CN101887970B CN101887970B CN2010102132350A CN201010213235A CN101887970B CN 101887970 B CN101887970 B CN 101887970B CN 2010102132350 A CN2010102132350 A CN 2010102132350A CN 201010213235 A CN201010213235 A CN 201010213235A CN 101887970 B CN101887970 B CN 101887970B
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- lithium
- positive plate
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- secondary battery
- ion secondary
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- 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
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a preparation method of a lithium-ion secondary battery positive plate, comprising the following steps: stirring and evenly dispersing a positive active substance, a binding agent, a conductive agent and an additive by a solvent to obtain positive slurry; uniformly coating the positive slurry on a positive current collector and then drying; and finally roll-pressing and slicing the dried positive current collector coated with the positive slurry to obtain the positive plate, wherein, the solvent for the positive slurry is the deionized water containing more than or equal to 0-20% of N, N-dimethyl pyrrolidine, and the binding agent is water-based kynar emulsion. In the preparation method of the lithium-ion secondary battery positive plate, the solvent for the positive slurry is the deionized water containing more than or equal to 0-20% of N, N-dimethyl pyrrolidine, thus having no environmental pollution and lowering production cost.
Description
Technical field
The present invention relates to a kind of preparation method of lithium-ion secondary battery positive plate, the preparation method of especially a kind of low cost and free of contamination lithium-ion secondary battery positive plate.
Background technology
Lithium rechargeable battery is as a kind of environmental protection battery, have the advantages such as operating voltage is high, specific energy is high and have extended cycle life, therefore obtained in recent years developing rapidly, be widely used in the mobile devices such as notebook computer, digital camera, mobile phone, MP3, MP4, electric bicycle and battery-operated motor cycle.
In the production technology of existing lithium-ion secondary battery positive plate, usually adopt organic solvent N in the anode sizing agent, N-dimethyl pyrrolidone (NMP) is as solvent.NMP is a kind of colourless transparent liquid, and its boiling point is 202 ℃, and flash-point is 95 ℃, easily volatilization and eyes and skin are had excitant.In the preparation technology of positive plate, NMP can not directly be discharged in the environment, need to recycle by equipment.Energy resource consumption is serious in the whole production technology, environment is had certain contaminative, and production cost is high.
In view of this, in order to adapt to the demand of Environmental Protection Situation, the necessary preparation method that a kind of low cost and free of contamination lithium-ion secondary battery positive plate are provided.
Summary of the invention
Technical problem to be solved by this invention is: the preparation method that a kind of low cost and free of contamination lithium-ion secondary battery positive plate are provided.
In order to solve the problems of the technologies described above, the invention provides a kind of preparation method of lithium-ion secondary battery positive plate, it may further comprise the steps: with positive active material, binding agent, conductive agent and additive by the stirring solvent acquisition anode sizing agent that is uniformly dispersed; Evenly be coated on the plus plate current-collecting body anode sizing agent and drying; And will make positive plate through roll-in, section through the plus plate current-collecting body that is coated with anode sizing agent of super-dry, wherein, the solvent that anode sizing agent adopts is N, N-dimethyl pyrrolidone (NMP) weight content is for being less than or equal to 20% deionized water greater than 0, and binding agent is the aqueous polyvinylidene fluoride emulsion.
With respect to prior art, the preparation method of lithium-ion secondary battery positive plate of the present invention has following useful technique effect:
1, because anode sizing agent adopts N, N-dimethyl pyrrolidone (NMP) weight content is for being less than or equal to 20% deionized water as solvent greater than 0, and cost reduces greatly with respect to nmp solvent, and environment is not polluted;
2, anode sizing agent adopts N, N-dimethyl pyrrolidone (NMP) weight content is for being less than or equal to 20% deionized water as solvent greater than 0, the boiling point of water is 100 ℃, well below 202 ℃ of the boiling points of NMP, therefore the bake out temperature in the positive plate dry run is 70 ~ 100 ℃, bake out temperature than nmp solvent is low, is conducive to reduce energy consumption;
3, N, N-dimethyl pyrrolidone (NMP) weight content is incombustible for being less than or equal to 20% deionized water greater than 0, can reduce fire risk.
As a kind of improvement of lithium-ion secondary battery positive plate preparation method of the present invention, the positive active material in the described anode sizing agent is selected from the transition metal oxide LiNiO of lithium
2, LiCoO
2, LiVPO
4, LiMnO
2, Li
2MnO
4, LiFePO
4, LiNi
xMn
1-xO
2, LiCo
xNi
1-xO
2, LiCo
1-(x+y), Ni
xMn
yO
2Or its combination, wherein, x, y, x+y＜1.
As a kind of improvement of lithium-ion secondary battery positive plate preparation method of the present invention, the conductive agent in the described anode sizing agent is conductive carbon black or CNT (carbon nano-tube) or its combination.
As a kind of improvement of lithium-ion secondary battery positive plate preparation method of the present invention, the additive in the described anode sizing agent is sodium carboxymethylcellulose, polyacrylic acid or Sodium Polyacrylate.
Description of drawings
Below in conjunction with the drawings and specific embodiments, preparation method and the useful technique effect thereof of lithium-ion secondary battery positive plate of the present invention is elaborated, wherein:
Fig. 1 is the lithium-ion button battery of the positive plate that adopts the comparative example method and obtain, at room temperature uses the cycle life figure of 0.2C electric current charge and discharge cycles 20 times.
Fig. 2 is the lithium-ion button battery of the positive plate that adopts preparation method embodiment 1 of the present invention and obtain, at room temperature uses the cycle life figure of 0.2C electric current charge and discharge cycles 20 times.
Embodiment
Below in conjunction with embodiment and accompanying drawing, describe the preparation method of lithium-ion secondary battery positive plate of the present invention in detail, but embodiments of the invention are not limited to this.
Comparative example
The preparation of positive plate: with LiFePO4 (LiFePO
4), conductive carbon black (Super-P), aqueous polyvinylidene fluoride be by weight 90.0:4.0:6.0 and N, N-dimethyl pyrrolidone (NMP) mixes, dispersed with stirring evenly obtains being coated with the anode sizing agent of positive plate, can pass through the NMP adjusting viscosity in the whipping process; Then, be coated on equably on the plus plate current-collecting body aluminium foil that thickness is 14 μ m anode sizing agent and drying, baking temperature is 120 ~ 140 ℃; At last, through roll-in, section (be about to positive plate and reduce, cut into required size), make positive plate.
The preparation of lithium-ion button battery: will sequentially assemble according to the positive plate of above-mentioned preparation method's acquisition, polypropylene (PP) barrier film and the negative plate metal lithium sheet that thickness is 20 μ m, and make lithium-ion button battery through fluid injection, sealing.
Figure 1 shows that the lithium-ion button battery in the comparative example, at room temperature use the cycle life figure of 0.2C electric current charge and discharge cycles 20 times.
Embodiment 1
The preparation of positive plate: with LiFePO4 (LiFePO
4), conductive carbon black (Super-P), polyacrylic acid (PAA), aqueous polyvinylidene fluoride emulsion be by weight 92:1.5:2:4.5 and N, N-dimethyl pyrrolidone (NMP) weight content is 20% deionized water mixing, dispersed with stirring evenly obtains being coated with the anode sizing agent of positive plate, can pass through the deionized water adjusting viscosity in the whipping process; Then, be coated on equably on the thick plus plate current-collecting body aluminium foil of 14 μ m anode sizing agent and drying, baking temperature is 80 ~ 100 ℃; Finally by roll-in, section (be about to positive plate and reduce, cut into required size), make positive plate.
The preparation of lithium-ion button battery: will sequentially assemble according to the positive plate of above-mentioned preparation method's acquisition, polypropylene (PP) barrier film and the negative plate metal lithium sheet that thickness is 20 μ m, and make lithium-ion button battery through fluid injection, sealing.
Figure 2 shows that the lithium-ion button battery in the embodiment of the invention 1, at room temperature use the cycle life figure of 0.2C electric current charge and discharge cycles 20 times.
The preparation method of lithium-ion secondary battery positive plate of the present invention does not only pollute environment, and production cost is low.Can find out from the cyclic curve of Fig. 2, adopt the lithium rechargeable battery of the positive plate of preparation method's acquisition of the present invention, its cycle performance does not have significant change, can use in actual production process.
Need to prove, although in this specification respectively with positive active material LiFePO
4And LiCoO
2For example describes preparation method of the present invention, still, according to other execution modes of the present invention, positive active material is LiNiO also
2, LiMnO
2, Li
2MnO
4, LiNi
xMn
1-xO
2, LiCo
xNi
1-xO
2, LiCo
1-(x+y), Ni
xMn
yO
2Or LiVPO
4(x, y, x+y＜1), or the combination of above-mentioned positive active material; In addition, conductive agent also can be conductive carbon black or CNT (carbon nano-tube) or its combination, and additive can be sodium carboxymethylcellulose or Sodium Polyacrylate.
The according to the above description announcement of book and instruction, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the present invention just for convenience of description.
Claims (4)
1. the preparation method of a lithium-ion secondary battery positive plate, it may further comprise the steps:
With positive active material, binding agent, conductive agent and additive by the stirring solvent acquisition anode sizing agent that is uniformly dispersed;
Evenly be coated on the plus plate current-collecting body anode sizing agent and drying; And
To make positive plate through roll-in, section through the plus plate current-collecting body that is coated with anode sizing agent of super-dry,
It is characterized in that: the solvent that described anode sizing agent adopts is N, and N-dimethyl pyrrolidone weight content is for being less than or equal to 20% deionized water greater than 0, and binding agent is the aqueous polyvinylidene fluoride emulsion.
2. the preparation method of lithium-ion secondary battery positive plate according to claim 1, it is characterized in that: the positive active material in the described anode sizing agent is selected from the transition metal oxide LiNi of lithium
xMn
1-xO
2, LiCoO
2, LiNiO
2, LiCo
1-(x+y)Ni
xMn
yO
2, LiCo
xNi
1-xO
2, LiVPO
4, LiMnO
2, Li
2MnO
4, LiFePO
4Or its combination, wherein, x, y, x+y＜1.
3. the preparation method of lithium-ion secondary battery positive plate according to claim 1, it is characterized in that: the conductive agent in the described anode sizing agent is conductive carbon black or CNT (carbon nano-tube) or its combination.
4. the preparation method of lithium-ion secondary battery positive plate according to claim 1, it is characterized in that: the additive in the described anode sizing agent is sodium carboxymethylcellulose, polyacrylic acid or Sodium Polyacrylate.
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| CN2010102132350A CN101887970B (en) | 2010-06-25 | 2010-06-25 | Preparation method of lithium-ion secondary battery positive plate |
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| CN101887970B true CN101887970B (en) | 2013-03-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069142A (en) * | 2010-12-23 | 2011-05-25 | 江苏理士电池有限公司 | Releasing agent for cast-on strap (COS) |
| JP2012212648A (en) * | 2011-03-24 | 2012-11-01 | Tokyo Univ Of Science | Electrode for sodium secondary battery, and sodium secondary battery |
| CN102290577B (en) * | 2011-07-25 | 2016-03-23 | 东莞新能源科技有限公司 | A kind of negative pole of lithium ion battery |
| GB2493375A (en) * | 2011-08-03 | 2013-02-06 | Leclancha S A | Aqueous slurry for battery electrodes |
| CN104701494A (en) * | 2015-03-23 | 2015-06-10 | 厦门钨业股份有限公司 | Method for improving water-based electrode slurry dispersion of lithium ion battery |
| CN105406083A (en) * | 2015-12-17 | 2016-03-16 | 湖南高远电池有限公司 | Quickly-chargeable/dischargeable lithium ion battery and manufacture method thereof |
| CN106711460B (en) * | 2016-12-22 | 2020-04-14 | 国联汽车动力电池研究院有限责任公司 | Electrode slurry composition and application thereof in preparing electrode and lithium ion battery |
| CN110620211A (en) * | 2019-08-01 | 2019-12-27 | 东莞市易利特新能源有限公司 | High-energy-density lithium ion battery and preparation method thereof |
| CN114243020A (en) * | 2021-12-21 | 2022-03-25 | 广西卓能新能源科技有限公司 | Binder formula of lithium ion battery anode material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532984A (en) * | 2003-03-21 | 2004-09-29 | 比亚迪股份有限公司 | Method for producing lithium ion secondary cell |
| CN101609882A (en) * | 2009-07-17 | 2009-12-23 | 江苏富朗特新能源有限公司 | A kind of lithium ion battery cathode slurry and preparation method thereof |
-
2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532984A (en) * | 2003-03-21 | 2004-09-29 | 比亚迪股份有限公司 | Method for producing lithium ion secondary cell |
| CN101609882A (en) * | 2009-07-17 | 2009-12-23 | 江苏富朗特新能源有限公司 | A kind of lithium ion battery cathode slurry and preparation method thereof |
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