CN105514441A - Polyvinylidene fluoride auxiliary composition - Google Patents
Polyvinylidene fluoride auxiliary composition Download PDFInfo
- Publication number
- CN105514441A CN105514441A CN201610059537.4A CN201610059537A CN105514441A CN 105514441 A CN105514441 A CN 105514441A CN 201610059537 A CN201610059537 A CN 201610059537A CN 105514441 A CN105514441 A CN 105514441A
- Authority
- CN
- China
- Prior art keywords
- polyvinylidene fluoride
- kynoar
- auxiliary composition
- parts
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
-
- 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
-
- 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 discloses a polyvinylidene fluoride auxiliary composition. The polyvinylidene fluoride auxiliary composition is prepared from, by weight, 5-15 parts of nylon acid methyl ester, 15-30 parts of acetyl dimethylamine, 0-10 parts of dipropylene glycol dimethyl ether and 45-80 parts of methyl pyrrolidone. The four components are fully mixed according to the needed amount and are mutually complementary and soluble, and the prepared auxiliary composition has the great solubility on polyvinylidene fluoride. Compared with a polyvinylidene fluoride auxiliary in the prior art, the polyvinylidene fluoride auxiliary composition has the advantages that the environmental friendliness and environmental protection property of the polyvinylidene fluoride auxiliary composition are greatly improved while the cost is controlled, and the national product quality control standard and the requirement for environmental protection at present are met.
Description
Technical field
The present invention relates to lithium battery manufacturing technology field, particularly a kind of Kynoar assistant composition.
Background technology
A series of outstanding advantages such as energy density is high, quality is light, self discharge is little owing to having for lithium battery, have extended cycle life, storage life length, stable operating voltage, memory-less effect, security performance is high, environmental pollution is little, have been widely used on novel portable communication, the electronic products such as mobile phone, notebook, video camera at present.The electrode of lithium battery is formed on collector body surface through rubbing method by the oxide isoreactivity material of carbon material and lithium.Namely, after active material etc. are distributed to Polymer Solution or high molecular dispersion liquid, collector body is coated on the surface.Therefore, the macromolecule as binding agent requires when preparing battery and battery repeated charge, and the film containing active material can not be thrown off from collector body, can not produce slight crack, and caking property is strong, and consumption just has enough adhesion strengths less.
Kynoar (PVDF) adhesive has excellent resistant to chemical media and adhesive property is widely used in the electrode moulding of lithium ion battery.But Kynoar is white powder crystalline polymer, degree of crystallinity is generally about 50%, crystalline melt temperature near 140 DEG C, therefore under the common serviceability temperature of battery, the crystallinity of PNDF makes the molecule that there is electrolyte be difficult to circulation, and discharge and recharge load increases.Therefore, reduce the crystallinity of PVDF, the chemical property of dissolubility to lithium battery increasing PVDF has vital effect.
Because PVDF has good chemical stability, at room temperature not by acid, alkali, strong oxidizer and halogen corrode, oleum, highly basic, ketone, ether continuous minority chemicals can make it swelling or be partly dissolved, and only has a few strong polar organic solvent that it can be made to be dissolved into colloidal solution.Along with the attention to environmental protection and safety and Health, increasing laws and regulations specify the application strictly limiting harmful substance, therefore reduce or do not use harmful substance more and more to become a main trend of producing at present.Meanwhile, use health environment-friendly material to have great challenge to production cost, therefore, the novel environment friendly PVDF auxiliary agent that exploitation has certain price advantage just has application value.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of Kynoar assistant composition of novel environment friendly, this assistant composition can be good at the solubility property increasing Kynoar, improves the caking property of Kynoar, thus improves the chemical property of lithium battery.
In order to solve the problems of the technologies described above, the technical scheme that the present invention takes is: a kind of Kynoar assistant composition, comprises the compound of following weight portion: nylon acid methyl esters 5-15 part, dimethylacetamide 15-30 part, dimethyl ether 0-10 part, methyl pyrrolidone 45-80 part.
Kynoar assistant composition of the present invention, preferably comprises the compound of following weight portion: nylon acid methyl esters 7-12 part, dimethylacetamide 18-24 part, dimethyl ether 3-8 part, methyl pyrrolidone 55-65 part.
Kynoar assistant composition of the present invention, comprises the compound of following weight portion further: nylon acid methyl esters 9-11 part, dimethylacetamide 20-22 part, dimethyl ether 4-6 part, methyl pyrrolidone 58-62 part.
Wherein, nylon acid methyl esters is by butanedioic acid (succinic acid) dimethyl ester CH
3oOC (CH
2)
2cOOCH
3, dimethyl glutarate CH
3oOC (CH
2)
3cOOCH
3with hexanedioic acid dimethyl ester CH
3oOC (CH
2)
4the dibasic ester solvent composition of COOCH tri-kinds of good environments, just because of the formation of this uniqueness, nylon acid methyl esters is made to become a kind of nontoxic, water white liquid, having the fragranced of light ester, have superpower solvability, is biodegradable environment protection type high-boiling-point solvent, be widely used in car paint, color steel sheet coating, can lacquer, enamelled wire and the industry such as family's electrical materials and appliances, furniture woodwork coating.Along with the attention to environmental protection and safety and Health, increasing laws and regulations regulation or suggestion do not use hazardous solvent, such as: chlorinated solvent class (trichloroethanes, chloromethanes etc.), and gylcol ether, ethanol ether acetic acid esters solvent etc.Nylon acid methyl esters product is then the best substitute of these solvents, and nylon acid methyl esters product also can fully meet the demand to VOC aspect day by day increased.In the present invention, nylon acid methyl esters is as a kind of higher boiling point environmentally friendly solvent, instead of the auxiliary agent of part high cost, with other component with the use of, add the adaptive capacity of assistant composition of the present invention to temperature, while auxiliary agent is increased the dissolubility of Kynoar, improve lithium battery in manufacturing process high temperature drying on the impact of battery charging and discharging performance.In the present invention, the use amount of nylon acid methyl esters is 5-15 part, is 7-12 part further, is further 9-11 part.
Dimethylacetamide is a kind of strong polar aprotic solvents, can dissolve multiple compounds, has that thermal stability is high, not facile hydrolysis, the feature such as corrosivity is low, toxicity is little, has good solvability to various kinds of resin.The low price that dimethylacetamide has and the high solubility to Kynoar, become the favorable substitutes of Kynoar New-type adjuvant composition.In the present invention, the addition of dimethylacetamide is 15-30 part, and being preferably 18-24 part, is 20-22 part further.
Dimethyl ether is a kind of multipurpose environment protection type solvent, has faint ethers smell, suitable evaporation rate, chemically excellent stability, and extremely excellent solubility property, has higher fail safe to human body.The U.S. and European Union are classified as the green solvent of NonHAP/NAP (Nonhazardousinthelistofairpollution).Usually can be used for water-based and coating material solidified in, also can be used for synthesis polyurethane etc.In the present invention, utilize solubility property and the environment friendly of dimethyl ether excellence, the auxiliary component of Substitute For Partial Kynoar, ensure that Kynoar is deliquescent while, ensure that the environmental-protecting performance of auxiliary agent greatly.In the present invention, the addition of dimethyl ether is 0-10 part, and being preferably 3-8 part, is 4-6 part further.It should be noted that, because the market price of dimethyl ether is higher, manufacturing enterprise can considering cost and effect, and optionally add or do not add dimethyl ether, the solubility property gap of the assistant composition produced to Kynoar is little.The assistant composition using dimethyl ether to make has very big raising on environmental safety and environmental-protecting performance, adds the environmental protection quality of footprint composition product.
The auxiliary agent that methyl pyrrolidone is commonly used as Kynoar on market, has certain solubility to Kynoar.But methyl pyrrolidone recent years is through Europe and U.S.'s recent studies on, its savings toxicity or have carcinogenic may, conclusion is not affirmed temporarily.Therefore, in assistant composition of the present invention, greatly reduce the consumption of methyl pyrrolidone, and the component adopting more environmental protection to have more price advantage substitutes.In the present invention, the addition of methyl pyrrolidone is 45-80 part, and being preferably 55-65 part, is 58-62 part further.
The methyl pyrrolidone of the nylon acid methyl esters that the present invention adopts price lower, dimethylacetamide Substitute For Partial high price, controls greatly and reduces the cost of manufacture of Kynoar auxiliary agent.Meanwhile, above four kinds of compositions fully mix according to aequum, and between each component, complementation is dissolved each other, and the assistant composition produced has very large solubility property to Kynoar.Compared with Kynoar auxiliary agent of the prior art, while controlling cost, its environment friendly and environmental-protecting performance also have greatly improved, and meet the control of product quality standard of country and the requirement to environmental protection at present.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.It should be noted that, compound used in the following example there is no particular restriction, adopts commercially available prod.
Embodiment 1
Nylon acid methyl esters 15 weight portion, dimethylacetamide 30 weight portion, dimethyl ether 10 weight portion, methyl pyrrolidone 45 weight portion.Above-claimed cpd is proportionally mixed, fully stirs, be prepared into Kynoar assistant composition.
Embodiment 2
Nylon acid methyl esters 10 weight portion, dimethylacetamide 21 weight portion, dimethyl ether 5 weight portion, methyl pyrrolidone 62 weight portion.Above-claimed cpd is proportionally mixed, fully stirs, be prepared into Kynoar assistant composition.
Embodiment 3
Nylon acid methyl esters 5 weight portion, dimethylacetamide 18 weight portion, methyl pyrrolidone 80 weight portion.Above-claimed cpd is proportionally mixed, fully stirs, be prepared into Kynoar assistant composition.
Embodiment 4
Nylon acid methyl esters 10 weight portion, dimethylacetamide 23 weight portion, dimethyl ether 5 weight portion, methyl pyrrolidone 65 weight portion.Above-claimed cpd is proportionally mixed, fully stirs, be prepared into Kynoar assistant composition.
Performance test
Prepare the compounding agent solution of Kynoar (suspension polymerisation) 10% (w/v) at normal temperatures, in mulser, dispersion is until Kynoar dissolves completely.The granularity of U.S. HoneywellX100 particle size distribution analysis instrument to Kynoar is used to characterize.The viscosity of testing size is carried out by the BohlinGemini2 rotational rheometer using Malvem company to produce.Test result is as follows:
As can be seen from the above table, assistant composition of the present invention is adopted to dissolve the compounding agent solution of the Kynoar 10% (w/v) of preparation, the particle mean size of Kynoar is all less than methyl pyrrolidone auxiliary agent conventional at present, and the complete dissolution time of Kynoar is also short compared with methyl pyrrolidone auxiliary agent dissolution time.Illustrate Kynoar assistant composition of the present invention can effectively rapid solution to Kynoar.Kynoar additive latex viscosity after the present invention's dissolving is less.After making the oven dry of corresponding electrode, select the lower PVDF binding agent emulsion of viscosity to contribute to forming good positive pole slurries, reduce the generation of slight crack, increase the serviceability of lithium battery.
Above-mentioned execution mode is intended to illustrate that the present invention can be professional and technical personnel in the field and realizes or use; modifying to above-mentioned execution mode will be apparent for those skilled in the art; therefore the present invention includes but be not limited to above-mentioned execution mode; any these claims or specification of meeting describes; meet and principle disclosed herein and novelty, the method for inventive features, technique, product, all fall within protection scope of the present invention.
Claims (3)
1. a Kynoar assistant composition, is characterized in that, comprises the compound of following weight portion: nylon acid methyl esters 5-15 part, dimethylacetamide 15-30 part, dimethyl ether 0-10 part, methyl pyrrolidone 45-80 part.
2. Kynoar assistant composition according to claim 1, is characterized in that, comprises the compound of following weight portion: nylon acid methyl esters 7-12 part, dimethylacetamide 18-24 part, dimethyl ether 3-8 part, methyl pyrrolidone 55-65 part.
3. Kynoar assistant composition according to claim 2, is characterized in that, comprises the compound of following weight portion: nylon acid methyl esters 9-11 part, dimethylacetamide 20-22 part, dimethyl ether 4-6 part, methyl pyrrolidone 58-62 part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610059537.4A CN105514441B (en) | 2016-01-28 | 2016-01-28 | A kind of Kynoar assistant composition |
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|---|---|---|---|
| CN201610059537.4A CN105514441B (en) | 2016-01-28 | 2016-01-28 | A kind of Kynoar assistant composition |
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| CN105514441A true CN105514441A (en) | 2016-04-20 |
| CN105514441B CN105514441B (en) | 2017-12-01 |
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|---|---|---|---|
| CN201610059537.4A Active CN105514441B (en) | 2016-01-28 | 2016-01-28 | A kind of Kynoar assistant composition |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6358901B1 (en) * | 1998-01-21 | 2002-03-19 | Rhodia Chimie | Paint stripping composition |
| CN103282478A (en) * | 2010-12-15 | 2013-09-04 | 罗地亚（中国）投资有限公司 | Fluoropolymer compositions |
| CN103666334A (en) * | 2013-04-26 | 2014-03-26 | 杭州金色能源科技有限公司 | Glue for lithium-ion battery rolling core and preparation method of glue |
-
2016
- 2016-01-28 CN CN201610059537.4A patent/CN105514441B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6358901B1 (en) * | 1998-01-21 | 2002-03-19 | Rhodia Chimie | Paint stripping composition |
| CN103282478A (en) * | 2010-12-15 | 2013-09-04 | 罗地亚（中国）投资有限公司 | Fluoropolymer compositions |
| CN103666334A (en) * | 2013-04-26 | 2014-03-26 | 杭州金色能源科技有限公司 | Glue for lithium-ion battery rolling core and preparation method of glue |
Non-Patent Citations (2)
| Title |
|---|
| LFW2007等: ""二甲基乙酰胺"", 《百度百科网》 * |
| 百科ROBOT等: ""二丙二醇二甲醚"", 《百度百科网》 * |
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| CN105514441B (en) | 2017-12-01 |
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