CN102569703A - Diaphragm and lithium ion battery applying diaphragm - Google Patents
Diaphragm and lithium ion battery applying diaphragm Download PDFInfo
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- CN102569703A CN102569703A CN2012100223886A CN201210022388A CN102569703A CN 102569703 A CN102569703 A CN 102569703A CN 2012100223886 A CN2012100223886 A CN 2012100223886A CN 201210022388 A CN201210022388 A CN 201210022388A CN 102569703 A CN102569703 A CN 102569703A
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- barrier film
- diaphragm
- battery
- lithium ion
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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
Abstract
The invention provides a diaphragm and a lithium ion battery applying the diaphragm. The diaphragm comprises a matrix diaphragm, a gel polymer coating and a heat insulation coating, and the surface of the matrix diaphragm dead against an anode sheet is coated with the gel polymer coating; and the surface of the matrix diaphragm dead against a cathode sheet is coated with the heat insulation coating. The lithium ion battery provided in the invention comprises the diaphragm. According to the lithium ion battery provided in the invention, the surface of the matrix diaphragm dead against the anode sheet is coated with the gel polymer coating, so the diaphragm can be tightly applied with the anode and the cathode, thereby the deposition of lithium on the cathode is uniform, the dendrite formation is inhibited, the safety of the battery is improved, and the life of the battery is prolonged; and the surface of the matrix diaphragm dead against the cathode sheet is coated with the heat insulation coating, so the heat stability and mechanical performances of the diaphragm are improved, thereby the safety of the battery is improved.
Description
Technical field
The present invention relates to the novel power supply technical field, relate in particular to a kind of barrier film and use the lithium ion battery of this barrier film.
Background technology
Along with the progress of information, material and energy technology, lithium ion battery is with advantages such as its high-energy-density, long circulation life, memory-less effect, safe and reliable and fast charging and dischargings and become the focus of novel power supply technical research.Lithium ion battery is made up of positive plate, negative plate, electrolyte, barrier film and battery case.
Wherein, barrier film is one of crucial interior layer assembly in the lithium ion battery as " the 3rd utmost point " of battery.Barrier film is positioned in the middle of the positive plate and negative plate of lithium ion battery; Be the part of lithium ion battery most critical, the topmost function of battery diaphragm is positive plate and the negative plate in the separate batteries, prevents that positive plate from directly contacting the generation short circuit with negative plate; Simultaneously; Because have a large amount of tortuous micropores that connect in the barrier film, the ionophore in the electrolyte can freely pass through in micropore, migration forms the inside battery galvanic circle between positive plate and negative plate; Electronics then moves between both positive and negative polarity through the external circuit and forms electric current, supplies the external equipment utilization.In addition, barrier film has the defencive function of automatically shutting down, because battery short circuit raises internal temperature of battery under the improper situation, when internal temperature of battery arrived closed pore temperature, the barrier film micropore can pass through by inaccessible blocking-up electric current.
At present, in the normally used lithium ion battery, barrier film and both positive and negative polarity are only realized faint applying through the faint surface tension that barrier film produces; In this case, the uniformity of electrode interface is difficult to guarantee, occurs problems such as barrier film fold, bubble coalescence, die opening be inhomogeneous easily; In use current density is inhomogeneous to cause battery; Electrode polarization increases, even the part occurs and analyse problems such as lithium, influences the life-span of battery; Simultaneously; Because the barrier film that present lithium ion battery uses is the TPO barrier film normally; And the thermal stability of TPO barrier film is limited, though this barrier film the closed pore phenomenon can occur under specified temp, along with the barrier film melting phenomenon can take place for the rising of battery temperature; Barrier film fusion meeting causes the short circuit of inside battery moment occurrence of large-area, causes battery blast on fire.In addition, the mechanicalness of TPO barrier film is also relatively poor, is occurring membrane ruptures very easily occurring under the external force situation, and membrane ruptures can cause the short circuit of inside battery moment occurrence of large-area equally, causes battery blast on fire.
Summary of the invention
In view of this, the invention provides a kind of barrier film and use the lithium ion battery of this barrier film, in order to solve electrode interface lack of homogeneity and the limited problem of barrier film thermal stability in the present lithium ion battery.Its technical scheme is following:
A kind of barrier film comprises: matrix barrier film, gel polymer coating and heat insulating coat;
Surface-coated over against positive plate on the said matrix barrier film has said gel polymer coating;
Surface-coated over against negative plate on the said matrix barrier film has said heat insulating coat.
Preferably, the gelatin polymer of said gel polymer coating is any or the combination in any in Kynoar, polytetrafluoroethylene, esters of acrylic acid, the fluoropolymer.
The thickness of said gel polymer coating is 1-5 μ m.
Preferably, the employed material of said heat insulating coat is pottery or organic aromatic substance.
The thickness of said heat insulating coat is 2-9 μ m.
A kind of lithium ion battery comprises above-mentioned barrier film.
Barrier film provided by the invention and the lithium ion battery of using this barrier film, through on the matrix barrier film over against the surface-coated gel polymer coating of positive plate, on the matrix barrier film over against the surface-coated heat insulating coat of negative plate; Make barrier film and electrode to fit tightly; Thereby make lithium more even, suppress dendrite and form, simultaneously in the deposition of negative pole; Improved barrier film thermal stability and mechanical performance, thus improved battery fail safe, prolonged life-span of battery.In addition, barrier film provided by the invention has reduced electrostatic phenomenon to a certain extent through on the matrix barrier film, applying gel polymer coating and heat insulating coat, has improved barrier film ionic conductivity and wettability, has improved the pliability of barrier film.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
The membrane configuration sketch map that Fig. 1 provides for the embodiment of the invention one.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one
The embodiment of the invention one provides a kind of barrier film, and is as shown in Figure 1, and this barrier film comprises: matrix barrier film 11, gel polymer coating 12 and heat insulating coat 13.Surfaces coated over against positive plate 14 on the matrix barrier film 11 is covered with gel polymer coating 12, and the surfaces coated over against negative plate 15 on the matrix barrier film 11 is covered with heat insulating coat 13.
In the present embodiment, the gelatin polymer of gel polymer coating 12 is any one or the combination in any in Kynoar, polytetrafluoroethylene, esters of acrylic acid, the fluoropolymer.It is above-mentioned several kinds that present embodiment does not limit employed gelatin polymer, as long as employed material can play the effect of gelatin polymer.
The preparation method of gel polymer coating 12 is: gelatin polymer is dissolved in the solvent of soluble polymer; Solid content is 1%-20%; Form colloidal sol shape glue; Colloidal sol shape glue is coated on the matrix barrier film 11 surface over against positive plate 13, forms gel polymer coating 12, the thickness of gel polymer coating 12 is about 1-5 μ m.
In the present embodiment, heat insulating coat 13 employed materials are that a kind of particle mean size is the pottery of 0.01-10 μ m, and certainly, present embodiment does not limit heat insulating coat 13 employed materials, as long as employed material is the heat insulation type material.Heat insulating coat 13 employed materials also can be organic aromatic substance.
The preparation method of heat insulating coat 13 is: the ceramic material of being selected for use or organic heat-barrier material and binding agent are dissolved in the solvent by proportioning; Form suspended nitride; The solid content of suspended nitride is 1%-30%; Then slurry is coated on the matrix barrier film 11 over against the surface of negative plate 15, the back that is heating and curing forms heat insulating coat 13, and the thickness of heat insulating coat 13 is 2-9 μ m.Wherein, binding agent is Kynoar, polyoxyethylene, polyacrylonitrile etc.
In the present embodiment, matrix barrier film 11 can be for the for example common TPO barrier film of microporous barrier, weave film, non-woven film for example nonwoven fabrics, composite membrane, diaphragm paper, laminate etc.
The preparation technology of gel polymer coating and heat insulating coat adopts aqueous slurry to apply in the embodiment of the invention, and perhaps, any use aqueous slurry coating in gel polymer coating and the heat insulating coat, another employing oil are that slurry applies.Comparing and all using oil in the prior art is that slurry applies, and the preparation technology that the present invention adopted can reduce cost, and also can reduce to the injury of operating personnel's health with to environment damage.
Embodiment two
The embodiment of the invention two provides a kind of lithium ion battery, and this lithium ion battery comprises the barrier film that embodiment one provides, and also comprises positive plate, negative plate, electrolyte and battery case.
In the present embodiment, the surperficial coated gel polymer coating over against positive plate on the matrix barrier film of barrier film helps the electrolyte infiltration, and this gel polymer coating can merge rapidly in lithium ion battery; Barrier film and pole piece can be fitted tightly; Make barrier film fixing smooth, can in electric core production and use, not produce fold, improved the interface; Reduce the probability that Li dendrite produces, prolonged the life-span of battery.
In addition; If only on the matrix barrier film of barrier film over against the surface-coated gel polymer coating of positive plate; The static of barrier film is more serious, and ionic conductivity and wettability are also poor slightly, on the matrix barrier film of barrier film, can reduce electrostatic phenomenon to a certain extent over against negative plate surface-coated heat insulating coat; Improve the practicality of barrier film, can improve barrier film ionic conductivity and wettability to a certain extent simultaneously.Though apply the applying effect that the gel polymerisation coating can be improved the interface separately, suppress the formation of Li dendrite, improve the fail safe of battery to a certain extent; The inside micro-short circuit problem that dendrite causes but this improvement only can be avoided, when battery temperature arrived 130-170 degree centigrade, barrier film still can deform; Cause battery explosion; After having added heat insulating coat, can the heat resisting temperature of barrier film be brought up to more than 250 degrees centigrade, thereby guarantee the fail safe of battery.
Because battery release heat in charging and discharging process; Especially when short circuit or overcharging, have a large amount of heats and emit, in this case; Barrier film can deform and/or break; Distortion and/or break after barrier film can't play the positive plate of isolating in the battery and the effect of negative plate, the short circuit of battery occurrence of large-area, thus explosion caused.In order to prevent the generation of above-mentioned situation; The battery that the embodiment of the invention provides passes through the heat insulating coat in the surface-coated of the matrix barrier film of barrier film, makes to support that when temperature reaches the barrier film fusing point barrier film is indeformable, has promptly improved the thermal stability of barrier film; Simultaneously; Heat insulating coat has improved the mechanical strength of barrier film, again because negative pole generally is the heat production source of inside lithium ion cell, so heat insulating coat and negative plate over against.In addition, when on the matrix barrier film at barrier film only during over against the surface-coated heat insulating coat of negative plate, the pliability of barrier film is poor slightly, on the surface of positive plate, is applying the pliability that gel polymer coating can improve barrier film to a certain extent on the matrix barrier film.
In the lithium ion battery that the embodiment of the invention two provides; Through on the matrix barrier film of barrier film over against the surface-coated gel polymer coating of positive plate, on the matrix barrier film of barrier film,, make barrier film and electrode to fit tightly over against the surface-coated heat insulating coat of negative plate; Thereby make lithium more even in the deposition of negative pole; Suppress dendrite and form, improved the thermal stability and the mechanical performance of barrier film simultaneously, thus improved battery fail safe, prolonged life-span of battery.In addition, the barrier film in the lithium ion battery provided by the invention has reduced electrostatic phenomenon to a certain extent, has improved barrier film ionic conductivity and wettability, has improved the pliability of barrier film through coating adhesive polymer coating and heat insulating coat on the matrix barrier film.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (6)
1. a barrier film is characterized in that, comprising: matrix barrier film, gel polymer coating and heat insulating coat;
Surface-coated over against positive plate on the said matrix barrier film has said gel polymer coating;
Surface-coated over against negative plate on the said matrix barrier film has said heat insulating coat.
2. barrier film according to claim 1 is characterized in that, the gelatin polymer of said gel polymer coating is any one or the combination in any in Kynoar, polytetrafluoroethylene, esters of acrylic acid, the fluoropolymer.
3. barrier film according to claim 2 is characterized in that, the thickness of said gel polymer coating is 1-5 μ m.
4. barrier film according to claim 3 is characterized in that, the employed material of said heat insulating coat is pottery or organic aromatic substance.
5. barrier film according to claim 4 is characterized in that, the thickness of said heat insulating coat is 2-9 μ m.
6. a lithium ion battery is characterized in that, comprises like any described barrier film among the claim 1-5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100223886A CN102569703A (en) | 2012-02-01 | 2012-02-01 | Diaphragm and lithium ion battery applying diaphragm |
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| CN2012100223886A CN102569703A (en) | 2012-02-01 | 2012-02-01 | Diaphragm and lithium ion battery applying diaphragm |
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| CN102569703A true CN102569703A (en) | 2012-07-11 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751462A (en) * | 2012-07-16 | 2012-10-24 | 中国海诚工程科技股份有限公司 | Power lithium ion battery and composite diaphragm thereof |
| CN104037378A (en) * | 2014-05-28 | 2014-09-10 | 中国乐凯集团有限公司 | Secondary lithium-ion battery separator and application thereof |
| CN104143615A (en) * | 2013-08-26 | 2014-11-12 | 河南师范大学 | Lithium ion battery composite diaphragm and preparation method thereof |
| CN105895845A (en) * | 2014-11-21 | 2016-08-24 | 深圳市天和顺科技有限公司 | Preparation methods of gel electrolyte separator and lithium ion battery |
| CN106159167A (en) * | 2015-05-13 | 2016-11-23 | 丰田自动车株式会社 | Nonaqueous electrolytic solution secondary battery |
| CN109244567A (en) * | 2018-06-28 | 2019-01-18 | 何伟成 | A kind of macromolecule heat-seal electrode coating improving lithium ion battery security |
| CN109690839A (en) * | 2016-07-22 | 2019-04-26 | 魁北克电力公司 | Flexible electrode-spacer element and preparation method thereof |
| CN116230944A (en) * | 2023-05-05 | 2023-06-06 | 四川新能源汽车创新中心有限公司 | Thermal-insulation pre-lithiation functional layer and lithium ion battery thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006164873A (en) * | 2004-12-10 | 2006-06-22 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolytic solution secondary battery |
| CN101916837A (en) * | 2010-08-31 | 2010-12-15 | 天津工业大学 | Preparation method of composite diaphragm of gel polymer lithium ion battery |
| CN102117905A (en) * | 2009-12-30 | 2011-07-06 | 上海比亚迪有限公司 | Composite diaphragm, preparation method and battery thereof |
-
2012
- 2012-02-01 CN CN2012100223886A patent/CN102569703A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006164873A (en) * | 2004-12-10 | 2006-06-22 | Matsushita Electric Ind Co Ltd | Non-aqueous electrolytic solution secondary battery |
| CN102117905A (en) * | 2009-12-30 | 2011-07-06 | 上海比亚迪有限公司 | Composite diaphragm, preparation method and battery thereof |
| CN101916837A (en) * | 2010-08-31 | 2010-12-15 | 天津工业大学 | Preparation method of composite diaphragm of gel polymer lithium ion battery |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751462A (en) * | 2012-07-16 | 2012-10-24 | 中国海诚工程科技股份有限公司 | Power lithium ion battery and composite diaphragm thereof |
| CN102751462B (en) * | 2012-07-16 | 2015-06-17 | 中国海诚工程科技股份有限公司 | Power lithium ion battery and composite diaphragm thereof |
| CN104143615A (en) * | 2013-08-26 | 2014-11-12 | 河南师范大学 | Lithium ion battery composite diaphragm and preparation method thereof |
| CN104143615B (en) * | 2013-08-26 | 2016-08-03 | 河南师范大学 | A kind of lithium ion battery composite separation membrane and preparation method thereof |
| CN104037378A (en) * | 2014-05-28 | 2014-09-10 | 中国乐凯集团有限公司 | Secondary lithium-ion battery separator and application thereof |
| CN105895845A (en) * | 2014-11-21 | 2016-08-24 | 深圳市天和顺科技有限公司 | Preparation methods of gel electrolyte separator and lithium ion battery |
| CN106159167A (en) * | 2015-05-13 | 2016-11-23 | 丰田自动车株式会社 | Nonaqueous electrolytic solution secondary battery |
| CN106159167B (en) * | 2015-05-13 | 2018-09-28 | 丰田自动车株式会社 | Nonaqueous electrolytic solution secondary battery |
| CN109690839A (en) * | 2016-07-22 | 2019-04-26 | 魁北克电力公司 | Flexible electrode-spacer element and preparation method thereof |
| CN109690839B (en) * | 2016-07-22 | 2022-06-03 | 魁北克电力公司 | Flexible electrode-separator element and method for the production thereof |
| CN109244567A (en) * | 2018-06-28 | 2019-01-18 | 何伟成 | A kind of macromolecule heat-seal electrode coating improving lithium ion battery security |
| CN116230944A (en) * | 2023-05-05 | 2023-06-06 | 四川新能源汽车创新中心有限公司 | Thermal-insulation pre-lithiation functional layer and lithium ion battery thereof |
| CN116230944B (en) * | 2023-05-05 | 2023-09-01 | 四川新能源汽车创新中心有限公司 | Thermal-insulation pre-lithiation functional layer and lithium ion battery thereof |
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Application publication date: 20120711 |