CN104861897A - Conductive binding agent and lithium ion battery - Google Patents
Conductive binding agent and lithium ion battery Download PDFInfo
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- CN104861897A CN104861897A CN201510182332.0A CN201510182332A CN104861897A CN 104861897 A CN104861897 A CN 104861897A CN 201510182332 A CN201510182332 A CN 201510182332A CN 104861897 A CN104861897 A CN 104861897A
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- ion battery
- lithium ion
- conductive polymer
- binding agent
- conductive adhesive
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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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Abstract
The invention provides a conductive binding agent and a lithium ion battery. The conductive binding agent comprise, by weight, 0.5-5% of a conventional binding agent, 0.5-5% of a conductive conjugated polymer, 0.001-2% of a dopant and 89-98% of an organic solvent. According to the invention, the conductive binding agent for lithium ion batteries is prepared with a mature conductive polymer system. The conductive binding agent has adhesiveness and also electronic conductivity. With the redox properties of the conductive binding agent, the binding function can be performed, and the conducting function can be performed between the positive and negative electrodes of the lithium ion battery. Therefore, the dose of a traditional conductive additive can be reduced, and lithium ion battery specific capacity can be improved.
Description
Technical field
The invention belongs to new forms of energy field of lithium, particularly a kind of conductive adhesive and a kind of lithium ion battery.
Background technology
Along with popularizing of the mobile internet device such as smart mobile phone and notebook computer, the popularization of the electric vehicle such as electric bicycle and battery-operated motor cycle, and the development of the aeronautical and space technology such as unmanned plane and space probe, performance of lithium ion battery is faced with higher demand for development, and volume is little, energy density height has become the research direction of high performance lithium ion battery.
Because high-energy type lithium ion battery is at the advanced information processing terminal. most important in the grand strategy such as equipment and electromobile field, although extremely the energy density of the current commercial lithium ion battery of the concern of people has reached 150 ~ 200W h/kg, the shortcoming of conventional lithium ion battery binding agent:
1. possesses physical bond performance;
2., as a kind of adhesion component, do not possess charge-discharge characteristic;
3. under the prerequisite of fixing positive and negative electrode weight, binding agent only participates in composition battery electrode as auxiliary material, and shared weight percent is higher, and corresponding positive and negative electrode active material can corresponding minimizing, the specific storage of reduction lithium ion battery;
4. binding agent itself does not possess conductivity, needs additionally to add conductive additive.
Conjugated conductive polymer is as a kind of novel functional materials, the characteristics such as its electromagnetism light, determine its application in different field, and by being increased sharply its doping specific conductivity, several even tens orders of magnitude can be increased, because conductive conjugated polymer has polymkeric substance simultaneously, inorganic semiconductor, the characteristic of metallic conductor, there is huge potential commercial application prospect, wherein poly-phenylene vinylene (ppv) and polyparaphenylene's acetylene and derivative thereof, there is good electron mobility, although itself is poorly soluble, but can by introducing long-chain flexible group, as alkyl and alkoxyl group, improve polymkeric substance solvent borne in organic solvent.Conduction conductive conjugated polymer through doping has oxidation-reduction catalysis function, ultimate principle is exactly the receiving and losing electrons of conjugated conductive polymer self, the potential difference that itself exists, conjugated conductive polymer is as the main component in lithium cell binding agent, under the prerequisite not increasing active substance, the redox discharge and recharge of polymkeric substance self as active substance, can improve the circulation volume of battery.
Summary of the invention
The object of this invention is to provide and a kind ofly possess the binding agent of charging/discharging function and the lithium ion battery of heavy body.
For realizing above object, technical scheme of the present invention is:
A kind of conductive adhesive, comprising: conventional binders, conjugated conductive polymer, doping agent and organic solvent, its weight percent is: conventional binders 0.5-5%; Conjugated conductive polymer 0.5-5%; Doping agent 0.001-2%; Organic solvent 89-98%.
Described conventional binders be lithium ion battery tradition binding agent PVDF and PTFE mono-kind and more than.
Described conjugated conductive polymer be poly-phenylene vinylene (ppv) and polyparaphenylene's acetylene and derivative thereof any one and more than.
Described doping agent is the compound of the long-chain flexible group containing Witco 1298 Soft Acid.
Described organic solvent is containing aniline, thiophene, any one solvent of pyrroles.
The preparation method of described conjugated conductive polymer is: with phenylenevinylene or to phenylenevinylene for raw material, add doping agent in raw material, by adding initiator, in a heated condition, polymerization reaction take place, generates conjugated conductive polymer poly-phenylene vinylene (ppv) or polyparaphenylene's acetylene.
Described initiator be thiosulphate one and more than.
A kind of based lithium-ion battery positive plate, comprise positive active material and conductive adhesive of the present invention, preparation method is: 1, add dried powders of one or both mixing of PVDF and PTFE in a solvent and conjugated conductive polymer is poly-to vinylbenzene or polyparaphenylene's acetylene or two kinds of mixing, the weight ratio that wherein PVDF and PTFE mono-kind and above conventional binders and conjugated conductive polymer account for binding agent is respectively 0.1-5%, 0.1-10%, is mixed with the conductive bond agent solution of 4-8wt%; 2, in binder solution, add positive active material mixing 100-300min, be mixed with the slurry that solid content is 65-75%, make positive plate in the mode of transfer coating or extrusion coated.
The weight ratio of described binder solution and positive active material is 1:1.8-3.
A kind of lithium ion battery, comprises negative pole, barrier film, shell, electrolytic solution and positive plate of the present invention.
The invention has the beneficial effects as follows:
1, the present invention uses ripe conductive polymer systems to prepare lithium ion battery conductive adhesive; Except possessing cohesiveness, also there is electron conduction, and the redox characteristic of conductive adhesive itself, the effect that can play bonding can play again the effect of conduction in lithium ion battery plus-negative plate, thus reducing the consumption of conventional conductive additive, the specific storage of lithium ion battery can also be improved.
2, the present invention is with PVDF, the lithium ion battery tradition binding agents such as PTFE with possess the poly-phenylene vinylene (ppv) of conductive characteristic and polyparaphenylene's acetylene and derivative mechanically mixing thereof, by long-chain flexible group such as Witco 1298 Soft Acids to the doping of conjugated conductive polymer, be dissolved in organic solvent after conjugated conductive polymer is adulterated, use as binding agent, traditional technology processing procedure and equipment can be utilized to prepare based lithium-ion battery positive plate and lithium ion battery, conductive adhesive lithium ion battery does not need the production and processing technology changing existing lithium ion battery, existing installation can be utilized completely.
3, in conjugated conductive polymer doping process of the present invention, number of electrons does not change, but is decomposed by the long-chain flexible group protonic acid that adulterates and produce hydrogen ion and negatively charged ion enters main chain, thus makes conjugated conductive polymer present solubility in organic solution.
Embodiment
Further illustrate one embodiment of the present invention below.
Embodiment 1:
1, with phenylenevinylene or to phenylenevinylene for raw material, add Witco 1298 Soft Acid in raw material, by adding initiator (Sulfothiorine etc.), in a heated condition, polymerization reaction take place, generates conjugated conductive polymer poly-phenylene vinylene (ppv) or polyparaphenylene's acetylene.
2, with nitrogen methyl-2-pyrrolidone (NMP) for solvent, add PVDF dried powder and conjugated conductive polymer poly-to vinylbenzene or polyparaphenylene's acetylene, wherein PVDF and conjugated conductive polymer account for weight of binder ratio as binding agent and are respectively 0.5%, 0.5%, are mixed with the conductive adhesive glue of 4-8wt%;
In conductive adhesive glue, add the positive active material mixing 120min of 1.8-3 times of conductive adhesive glue weight, be mixed with the slurry that solid content is 65-75%;
Make pole piece in the mode of transfer coating or extrusion coated, through cutting, reeling, refill and be made into battery work in-process, baking, fluid injection, activate, change into after the lithium ion battery of charged embodiment 1.
Embodiment 2:
1, with phenylenevinylene or to phenylenevinylene for raw material, add Witco 1298 Soft Acid in raw material, by adding initiator (Sulfothiorine etc.), in a heated condition, polymerization reaction take place, generates conjugated conductive polymer poly-phenylene vinylene (ppv) or polyparaphenylene's acetylene.
2, with nitrogen methyl-2-pyrrolidone (NMP) for solvent, add PVDF dried powder and conjugated conductive polymer poly-to vinylbenzene or polyparaphenylene's acetylene, wherein PVDF and conjugated conductive polymer account for weight of binder ratio as binding agent and are respectively 0.5%, 1.5%, are mixed with the conductive adhesive glue of 4-8wt%;
In conductive adhesive glue, add the positive active material mixing 240min of adhesive gelatin 1.8-3 times of conductive adhesive weight, be mixed with the slurry that solid content is 65-75%;
Make pole piece in the mode of transfer coating or extrusion coated, through cutting, reeling, refill and be made into battery work in-process, baking, fluid injection, activate, change into after the lithium ion battery of charged embodiment 2.
Comparative example
With nitrogen methyl-2-pyrrolidone (NMP) for solvent, add PVDF dried powder, wherein PVDF accounts for positive pole powder weight ratio is 0.5-2%; Be mixed with the adhesive gelatin of 4-8wt%;
In adhesive gelatin, add the positive active material 240min of 1.8-3 times of adhesive gelatin weight, be mixed with the slurry that solid content is 65-75%;
Make pole piece in the mode of transfer coating or extrusion coated, through cutting, reeling, refill and be made into battery work in-process, baking, fluid injection, activate, change into after charged comparative example's lithium ion battery.
Lithium ion battery prepared by embodiment 1,2 and comparative example 1 is carried out internal resistance, volume capacity ratio and cycle performance aspect to test, result is as follows:
Above-described embodiment is only and technological thought of the present invention and feature is described, it describes comparatively concrete and detailed, its object is to enable those of ordinary skill in the art understand content of the present invention and implement according to this, therefore only the scope of the claims of the present invention can not be limited with this, it should be noted that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made, i.e. all any amendments done according to the embodiment of the present invention, equivalent variations and modification, all still belong in the scope of technical scheme of the present invention.
Claims (10)
1. a conductive adhesive, comprising: conventional binders, conjugated conductive polymer, doping agent and organic solvent, and its weight percent is: conventional binders 0.5-5%; Conjugated conductive polymer 0.5-5%; Doping agent 0.001-2%; Organic solvent 89-98%.
2. conductive adhesive according to claim 1, described conventional binders be lithium ion battery tradition binding agent PVDF and PTFE mono-kind and more than.
3. conductive adhesive according to claim 1, described conjugated conductive polymer be poly-phenylene vinylene (ppv) and polyparaphenylene's acetylene and derivative thereof any one and more than.
4. conductive adhesive according to claim 1, described doping agent is the compound of the long-chain flexible group containing Witco 1298 Soft Acid.
5. conductive adhesive according to claim 1, described organic solvent is containing aniline, thiophene, any one solvent of pyrroles.
6. conductive adhesive according to claim 1, the preparation method of described conjugated conductive polymer is: with phenylenevinylene or to phenylenevinylene for raw material, add doping agent in raw material, by adding initiator, in a heated condition, polymerization reaction take place, generates conjugated conductive polymer poly-phenylene vinylene (ppv) or polyparaphenylene's acetylene.
7. conductive adhesive according to claim 6, described initiator be thiosulphate one and more than.
8. a based lithium-ion battery positive plate, comprise positive active material and the conductive adhesive described in any one of claim 1-7, preparation method is: 1, add dried powders of one or both mixing of PVDF and PTFE in a solvent and conjugated conductive polymer is poly-to vinylbenzene or polyparaphenylene's acetylene or two kinds of mixing, the weight ratio that wherein PVDF and PTFE mono-kind and above conventional binders and conjugated conductive polymer account for binding agent is respectively 0.1-5%, 0.1-10%, is mixed with the conductive bond agent solution of 4-8wt%; 2, in binder solution, add positive active material mixing 100-300min, be mixed with the slurry that solid content is 65-75%, make positive plate in the mode of transfer coating or extrusion coated.
9. based lithium-ion battery positive plate according to claim 8, the weight ratio of described binder solution and positive active material is 1:1.8-3.
10. a lithium ion battery, comprises negative pole, barrier film, shell, electrolytic solution and the positive plate described in any one of claim 8-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510182332.0A CN104861897A (en) | 2015-04-16 | 2015-04-16 | Conductive binding agent and lithium ion battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105355922A (en) * | 2015-11-03 | 2016-02-24 | 百顺松涛（天津）动力电池科技发展有限公司 | Polyindole crosslinked polyvinylidene fluoride binder and lithium ion battery applying the same |
| CN105418894A (en) * | 2016-01-19 | 2016-03-23 | 上海海事大学 | Novel thermoplastic polymer binder |
| CN105655593A (en) * | 2016-03-25 | 2016-06-08 | 中国科学院长春应用化学研究所 | Conductive adhesive for positive electrode of lithium-sulfur battery and preparation method of conductive adhesive |
| CN109411761A (en) * | 2018-12-03 | 2019-03-01 | 中南民族大学 | The multifunctional unit combination electrode slurry and preparation method of the polymer containing active carbonyl group |
| CN109755574A (en) * | 2017-11-02 | 2019-05-14 | 南京知博工业科技有限公司 | A kind of compound binding agent |
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| CN101630729A (en) * | 2009-04-16 | 2010-01-20 | 华中科技大学 | Composite electrode materials for high power lithium secondary battery and preparation method thereof |
| CN103754858A (en) * | 2014-01-10 | 2014-04-30 | 纪效波 | Hard carbon cathode material for power energy storage battery and preparation method thereof |
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2015
- 2015-04-16 CN CN201510182332.0A patent/CN104861897A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101630729A (en) * | 2009-04-16 | 2010-01-20 | 华中科技大学 | Composite electrode materials for high power lithium secondary battery and preparation method thereof |
| CN103754858A (en) * | 2014-01-10 | 2014-04-30 | 纪效波 | Hard carbon cathode material for power energy storage battery and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105355922A (en) * | 2015-11-03 | 2016-02-24 | 百顺松涛（天津）动力电池科技发展有限公司 | Polyindole crosslinked polyvinylidene fluoride binder and lithium ion battery applying the same |
| CN105418894A (en) * | 2016-01-19 | 2016-03-23 | 上海海事大学 | Novel thermoplastic polymer binder |
| CN105655593A (en) * | 2016-03-25 | 2016-06-08 | 中国科学院长春应用化学研究所 | Conductive adhesive for positive electrode of lithium-sulfur battery and preparation method of conductive adhesive |
| CN109755574A (en) * | 2017-11-02 | 2019-05-14 | 南京知博工业科技有限公司 | A kind of compound binding agent |
| CN109411761A (en) * | 2018-12-03 | 2019-03-01 | 中南民族大学 | The multifunctional unit combination electrode slurry and preparation method of the polymer containing active carbonyl group |
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Application publication date: 20150826 |