CN1700501A - Phosphate polymer Li-ion battery and method for manufacturing the same - Google Patents
Phosphate polymer Li-ion battery and method for manufacturing the same Download PDFInfo
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- CN1700501A CN1700501A CNA2005100354238A CN200510035423A CN1700501A CN 1700501 A CN1700501 A CN 1700501A CN A2005100354238 A CNA2005100354238 A CN A2005100354238A CN 200510035423 A CN200510035423 A CN 200510035423A CN 1700501 A CN1700501 A CN 1700501A
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- Prior art keywords
- polymer
- ion battery
- solvent
- copolymer
- phosphate
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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
-
- 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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
This invention relates to lithium ion battery and its process method filed and specially to one polymer lithium ion process method, which provides lithium ion and processes the lithium imbedded microcosmic salt as activated substance, furthermore, it uses battery as carrier to coat on one polymer layer on its surface under certain temperature and pressure, wherein, the polymer is plastic by the solvent by electrolyte to form stable gel electrolyte layer, wherein, the polymer is fluoroethylene and hexafluoropropylene polymer or epoxyethane, epoxypropane or copolymer.
Description
Technical field:
The present invention relates to lithium ion battery and manufacture method technical field thereof, refer in particular to a kind of phosphate polymer Li-ion battery and manufacture method thereof.
Background technology:
For traditional liquid lithium ionic cell, because the fail safe of after polymerization thing lithium ion battery is good, energy density is high, and is fabricated onto below 3 millimeters easily, so its occupation rate of market is more and more higher.Common lithium ion battery is to be superposeed successively by positive pole, isolation diaphragm, negative pole to form, and its inside is added with electrolyte.Wherein positive and negative electrode is by collector be coated on its surperficial active material and constitute, and isolation diaphragm adopts technologies such as plasticizing, extraction to make the film of micropore, contains lithium salts like this (as LiPF
6) the organic solvent electrolyte can pour into wherein.The active material of negative pole for can embed, the material of removal lithium embedded ion, as graphite, auxiliary substance has adhesive, conductive agent and plasticiser; Anodal movable material is for taking off embedding, repointing the material into lithium ion, as cobalt acid lithium LiCoO
2, LiMn2O4 LiMn
2O
4, auxiliary substance has adhesive, conductive agent and plasticiser.
In the existing four base polymer electrolyte of after polymerization thing lithium battery, solid state electrolysis system and ionic rubber system still are in developing stage fully, and gel polymer electrolyte system preparation technology relative complex, harsh to the ambient humidity requirement.For example: the most frequently used manufacture method of after polymerization thing lithium ion battery adopts the (BELLCORE of U.S. bell communication research institute exactly at present, USA) a kind of plasticizing attitude method for preparing polymer electrolytes (U.S. Patent number is: US 5296318) of announcing in 1994, the advantage of this method is, in whole manufacturing process, the operation of finishing in drying shed is less.The deficiency of its existence is exactly to need extraction and automated production difficulty in its manufacture process.Manufacture for the gel state electrolyte battery is to add can form the prepolymer of gel as monomer in liquid electrolyte, the copolymer of oxirane and expoxy propane for example, cardinal extremity is polymerisable group, carry out polymerization crosslinking in the battery stage then, polymer after crosslinked pins liquid flux and electrolyte, forms gel electrolyte.The difficulty of this method is that the electrolyte viscosity that contains performed polymer becomes big, and the diffusion difficulty causes electrolyte inhomogeneous easily, and the polymerization crosslinking in battery stage also is not easy control.In addition, Chinese invention patent discloses the by name of Sony application: (number of patent application is: 00117653.6), it still is a kind of gel state electrolyte battery to the patent of invention of solid electrolyte cell.The existing deficiency of this method is exactly: contain lithium salts in the electrolyte, and the lithium salts that generally is used for lithium-ion electrolyte is having meeting decomposition under the environment of moisture, battery performance is seriously influenced, cause its operation in drying shed too much, increased manufacturing cost.And, preparation easy dissolve polymer of low boiling point solvent and form gel during gel electrolyte, but because low boiling point solvent has effumability, in applying operation, the gel electrolyte that contains low boiling point solvent is to be difficult to control.If select for use high boiling solvent to prepare gel electrolyte, except high boiling solvent can cause gel electrolyte coating Working Procedure Controlling difficulty, it also can cause the poor performance at low temperatures of battery.
Summary of the invention:
Technical problem to be solved by this invention just is to overcome the deficiency that exists in present product and the manufacture method, provides that a kind of manufacturing process is simple, the phosphate polymer Li-ion battery and the manufacture method thereof of stable performance.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme: anodal among the present invention is active material by lithium ion being provided and can carrying out the phosphate that lithium embedded/took off embedding, because phosphatic raw material is extensive, its cost is lower, and phosphate has very outstanding fail safe and cycle performance.
In addition, among the present invention, in being coated with the polymer of one deck as gel electrolyte layer between positive pole and the barrier film and between negative pole and the barrier film, this polymer is a copolymer from vinylidene fluoride and hexafluoropropylene; The homopolymers of oxirane, expoxy propane or copolymer are perhaps based on its this property polymer of other groups of interpolation.It perhaps is the mixture of above two kinds of materials.
The technical scheme that manufacture method of the present invention adopted is: with polymer (A) copolymer from vinylidene fluoride and hexafluoropropylene, or/and (B) homopolymers of oxirane, expoxy propane or copolymer, be dissolved in a kind of solvent, the solution that will be dissolved with above-mentioned polymer with dipping, spraying, printing, brushing mode is coated in the positive and negative electrode surface of battery then; The positive pole, negative pole and the barrier film that coating are reunited compound superpose, and pack with aluminum-plastic composite membrane, add nonaqueous electrolytic solution therein, after the Vacuum Package, heat, pressurize and carry out plastics processing, make polymer Li-ion battery.
It is positive active material that the present invention at first adopts phosphate, to reduce the cost of product.Secondly, the present invention is carrier with the electrode, and a kind of polymeric layer is coated on its surface, and under uniform temperature and pressure, polymer is formed the stabilizing gel dielectric substrate by the plasticizing of the solvent in the electrolyte.The method applied in the present invention owing to there is not directly to use the electrolyte that contains lithium, has reduced the operation in drying shed, the step that simplifies the operation, and the dielectric substrate stable performance of battery.
Embodiment:
The present invention adopts a kind of lithium electrolyte that do not contain:
(A), copolymer from vinylidene fluoride and hexafluoropropylene (PVDF-HFP), its fusing point is between 138～160 degrees centigrade;
(B), the homopolymers or the copolymer of oxirane, expoxy propane, perhaps based on its this property polymer of other groups of interpolation, its molecular weight is between 5000～50000;
(C), can also be (A) and mixture (B);
After the solvent general solution, be coated to the surface of electrode, then by under suitable temperature, make the solvent swell electrode surface in the electrolyte obtain polymeric layer, form polyelectrolyte floor, add the suitable pressure that gets, make it between electrode and barrier film, form uniform interface.
Particularly, the present invention is made of battery and the aluminium plastic composite packaging film that is used for the battery pack core.Battery comprises: positive pole, negative pole and the barrier film between both positive and negative polarity.
Wherein anodally comprise collector and be coated on active material on the collector by bonding agent that this active material is for providing lithium ion and can carrying out the phosphate that lithium embedded/took off embedding, its chemical formula is LiMPO
4, wherein M is a kind of metallic element.For example iron (Fe) or vanadium (V) certainly, are not limited only to this two kinds of elements.
Negative pole maybe can carry out material that lithium embedded/took off embedding as active material by material with carbon element, and it comprises collector and bonding agent.
Barrier film is that polyolefin is the film that contains micropore of basic material.
The present invention is being coated with the polymer of one deck as gel electrolyte layer between positive pole and the barrier film and between negative pole and the barrier film.This polymer-coated is in the surface of positive and negative electrode.This polymer is above-mentioned A, B, three kinds of materials of C.And painting method of the present invention is to have the solution of above-mentioned polymer to be coated in the positive and negative electrode of battery solvent with dipping, spraying, printing, brushing mode; Then, the positive pole, negative pole and the barrier film that coating are reunited compound superpose,
And pack with aluminum-plastic composite membrane, add nonaqueous electrolytic solution therein, carry out plastics processing after the Vacuum Package; At last, product is repaired subsequent treatment, make polymer Li-ion battery.
The above-mentioned solvent that is used for dissolve polymer in the choice can be very extensive, so long as can dissolve the polymer that will apply, and solvent that simultaneously can the original bonding agent of lysis electrodes can.For example, solvent can adopt one or more in the following solvent: ketones solvents such as acetone, methylethylketone; Esters solvent such as ethyl acetate, methyl acetate; Oxolane, heterocyclic compound solvents such as r butyrolactone; Carbonates such as dimethyl carbonate, ethylene carbonate solvent.But the present invention is not limited to above-mentioned cited solvent.Above-mentioned solvent singly can not use separately, and can select two or more formation mixed solvents, to improve its performance.For example, acetone and isopropyl alcohol by the method pore-creating on coat that is separated, can improve the performance of gel electrolyte battery according to 9: 1 mixed.The control of condition will consider that the physical characteristic of solution is selected suitable application temperature, humidity during for coating, the temperature and humidity when dry.Its single face of thickness that applies is less than 15 microns, and too thick gel layer can cause the increase of battery internal resistance.
Polymer is above-mentioned A, B, three kinds of materials of C, if copolymer from vinylidene fluoride and hexafluoropropylene (PVDF-HFP) uses separately, then its fusing point is between 135～160 degrees centigrade.The selection of fusing point is relevant with the content of hexafluoropropylene, and it also influences the solubility of copolymer from vinylidene fluoride and hexafluoropropylene in solvent, also influences the physical characteristic of gel electrolyte.The molecular weight of polymer can influence the physical characteristic of gel electrolyte equally.If polymer adopts the homopolymers or the copolymer of oxirane, expoxy propane, its molecular weight should be between 5000～50000.Its end group introducing and group (for example carbon-carbon double bond) that can be crosslinked are by its solubility in electrolyte of crosslinked reduction, to form gel.Certainly, the homopolymers of copolymer from vinylidene fluoride and hexafluoropropylene and oxirane, expoxy propane or copolymer can also be mixed and use.
The gelation operation of polymer is to pack with aluminum-plastic composite membrane, and adds nonaqueous electrolytic solution therein, after the Vacuum Package.Under suitable temperature, add suitable pressure, with the formation gel electrolyte, and between barrier film and both positive and negative polarity, form good interface.Above-mentioned suitable temperature is located between the boiling point of solvent in the temperature that forms gelation and the electrolyte.If temperature is too low, can not form gel electrolyte, and too high temperature can cause the electroanalysis solvent vaporization at all, destroy the interface between electrode and the barrier film.The temperature that the present invention recommends is 50 to 110 degrees centigrade.The selection of pressure is also very important, the interface of too little insufficient pressure to form, and too big pressure can increase short risk, the pressure that the present invention recommends is 400～4000kPa.Follow-up battery can change into, and can produce gas owing to change into, and the interface between barrier film and the electrode may be destroyed, thus change into need to do once again after finishing heat, pressurized treatments, to form good interface.
Below be one embodiment of the present of invention:
Negative pole: 97% graphite is active material, and 1.5% SBR (Styrene Butadiene Rubber rubber) is a bonding agent, 1.5% CMC.
Anodal: 85% LiFePO4,9% acetylene carbon black are conductive agent, and 6% poly-inclined to one side fluorine resin (PVDF) is a bonding agent.
Barrier film: the polyolefine material of 40% porosity, thickness are 20 microns.
Electrolyte: the volume ratio of ethyl acetate (EC)/dimethyl carbonate (DMC)/carbonic acid ethyl methyl esters (EMC) is 4: 4: 2,1 mole LiPF
6
Polymer: fusing point is 142 degrees centigrade, and model is the PVDF-HFP of Kynar 2801.
Gel operation: 55 degrees centigrade of temperature, pressure 600kPa.
Prepared cell, its major parameter and performance are as follows:
Battery size: 9070200 (L * W * H=200mm * 7mm * 7mm)
Capacity: 12Ah (0.2C)
Cell thickness: 8.75mm (containing outer aluminum-plastic packaged)
Charging cut-ff voltage: 3.65V
Discharge cut-off voltage: 2.50V
Claims (10)
1, a kind of phosphate polymer Li-ion battery, comprise: positive pole, negative pole and the barrier film between both positive and negative polarity, wherein negative pole maybe can carry out lithium by material with carbon element and embeds/take off the material of embedding as active material, barrier film is that polyolefin is the film that contains micropore of basic material, it is characterized in that: anodal is active material by lithium ion being provided and can carrying out the phosphate that lithium embedded/took off embedding, and chemical formula is LiMPO
4, wherein M is a kind of metallic element.
2, a kind of phosphate polymer Li-ion battery according to claim 1 is characterized in that: in being coated with the polymer of one deck as gel electrolyte layer between positive pole and the barrier film and between negative pole and the barrier film.
3, a kind of phosphate polymer Li-ion battery according to claim 2 is characterized in that: described polymer is a copolymer from vinylidene fluoride and hexafluoropropylene.
4, a kind of phosphate polymer Li-ion battery according to claim 2 is characterized in that: described polymer is the homopolymers or the copolymer of oxirane, expoxy propane, perhaps based on its this property polymer of other groups of interpolation.
5, a kind of phosphate polymer Li-ion battery according to claim 3, it is characterized in that: the fusing point of described copolymer from vinylidene fluoride and hexafluoropropylene is between 135～160 degrees centigrade.
6, a kind of phosphate polymer Li-ion battery according to claim 4 is characterized in that: the homopolymers of described oxirane, expoxy propane or copolymer, its molecular weight is between 5000～50000.
7, a kind of phosphate polymer Li-ion battery according to claim 2, it is characterized in that: described polymer is a kind of mixture, this mixture comprises: copolymer from vinylidene fluoride and hexafluoropropylene, and the homopolymers or the copolymer of oxirane, expoxy propane, perhaps based on its other groups of interpolation polymer-modified.
8, a kind of manufacture method of phosphate polymer Li-ion battery, the negative pole of its battery maybe can carry out lithium by material with carbon element and embed/take off the material of embedding as active material, barrier film is that polyolefin is the film that contains micropore of basic material, it is characterized in that: this battery positive pole is an active material by lithium ion being provided and can carrying out the phosphate that lithium embedded/took off embedding, chemical formula is LiMPO4, wherein M is a kind of metallic element, and in being coated with one layer of polymeric between positive pole and the barrier film and between negative pole and the barrier film, this polymer is:
One, copolymer from vinylidene fluoride and hexafluoropropylene, or/and
Two, the homopolymers of oxirane, expoxy propane or copolymer are perhaps based on its this property polymer of other groups of interpolation;
The process of its coating is:
At first, with polymer dissolution in a kind of solvent;
Secondly, there is the solution of above-mentioned polymer to be coated in the positive and negative electrode surface of battery solvent with dipping, spraying, printing, brushing mode;
Then, the positive pole, negative pole and the barrier film that coating are reunited compound superpose, and pack with aluminum-plastic composite membrane, add nonaqueous electrolytic solution therein, after the Vacuum Package, heat, pressurize and carry out plastics processing;
At last, the subsequent handling to product changes into makes polymer Li-ion battery.
9, the manufacture method of a kind of polymer Li-ion battery according to claim 7 is characterized in that: the solvent that is used for dissolve polymer is one or more of following solvent: acetone, methylethylketone ketones solvent; Ethyl acetate, methyl acetate esters solvent; Oxolane, gamma butyrolactone heterocyclic compound solvent; Dimethyl carbonate, ethylene carbonate carbonates solvent.
10, the manufacture method of a kind of polymer Li-ion battery according to claim 7 is characterized in that: added temperature is 50 to 110 degrees centigrade; Pressure is 400～4000kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100354238A CN1700501A (en) | 2005-06-27 | 2005-06-27 | Phosphate polymer Li-ion battery and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100354238A CN1700501A (en) | 2005-06-27 | 2005-06-27 | Phosphate polymer Li-ion battery and method for manufacturing the same |
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| Publication Number | Publication Date |
|---|---|
| CN1700501A true CN1700501A (en) | 2005-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100354238A Pending CN1700501A (en) | 2005-06-27 | 2005-06-27 | Phosphate polymer Li-ion battery and method for manufacturing the same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420076C (en) * | 2005-12-19 | 2008-09-17 | 南开大学 | Synthesis of lithium ion battery anode material vanadium lithium phosphate using sol-gel method |
| CN101662042A (en) * | 2008-08-29 | 2010-03-03 | 深圳市比克电池有限公司 | Polymer lithium ion battery and preparation method of diaphragm thereof |
| CN101662041A (en) * | 2008-08-29 | 2010-03-03 | 深圳市比克电池有限公司 | Method for preparing gel polymer lithium ion battery |
| CN101276896B (en) * | 2007-03-28 | 2011-12-28 | 三洋电机株式会社 | Non-aqueous electrolyte battery |
| CN101677139B (en) * | 2008-09-19 | 2013-04-03 | 深圳市比克电池有限公司 | Method of preparing gel polymer lithium ion battery |
| CN103222100A (en) * | 2010-09-24 | 2013-07-24 | 积水化学工业株式会社 | Manufacturing method for electrolyte, electrolyte solution, gel electrolyte, electrolyte membrane and gel electrolyte battery, and lithium-on secondary battery |
-
2005
- 2005-06-27 CN CNA2005100354238A patent/CN1700501A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420076C (en) * | 2005-12-19 | 2008-09-17 | 南开大学 | Synthesis of lithium ion battery anode material vanadium lithium phosphate using sol-gel method |
| CN101276896B (en) * | 2007-03-28 | 2011-12-28 | 三洋电机株式会社 | Non-aqueous electrolyte battery |
| CN101662042A (en) * | 2008-08-29 | 2010-03-03 | 深圳市比克电池有限公司 | Polymer lithium ion battery and preparation method of diaphragm thereof |
| CN101662041A (en) * | 2008-08-29 | 2010-03-03 | 深圳市比克电池有限公司 | Method for preparing gel polymer lithium ion battery |
| CN101662042B (en) * | 2008-08-29 | 2014-04-30 | 深圳市比克电池有限公司 | Polymer lithium ion battery and preparation method of diaphragm thereof |
| CN101662041B (en) * | 2008-08-29 | 2014-08-27 | 深圳市比克电池有限公司 | Method for preparing gel polymer lithium ion battery |
| CN101677139B (en) * | 2008-09-19 | 2013-04-03 | 深圳市比克电池有限公司 | Method of preparing gel polymer lithium ion battery |
| CN103222100A (en) * | 2010-09-24 | 2013-07-24 | 积水化学工业株式会社 | Manufacturing method for electrolyte, electrolyte solution, gel electrolyte, electrolyte membrane and gel electrolyte battery, and lithium-on secondary battery |
| CN103222100B (en) * | 2010-09-24 | 2017-09-08 | 积水化学工业株式会社 | Electrolyte, electrolyte, gel electrolyte, dielectric film, the manufacture method of gel electrolyte battery and lithium rechargeable battery |
| US10256497B2 (en) | 2010-09-24 | 2019-04-09 | Sekisui Chemical Co., Ltd. | Electrolyte, electrolyte solution, gel electrolyte, electrolyte membrane, method for manufacturing gel electrolyte battery, and lithium ion secondary battery |
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