CN109830643A - Reduce the film and its preparation method and application of lithium battery interface impedance - Google Patents
Reduce the film and its preparation method and application of lithium battery interface impedance Download PDFInfo
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- 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 present invention provides a kind of films and its preparation method and application for reducing lithium battery interface impedance.The method that preparation of the present invention reduces the film of lithium battery interface impedance is to mix ionic liquid, lithium salts and organic solvent, and obtained mixed electrolytic solution is coated on pole piece, to be reduced the film of lithium battery interface impedance.This method is not only simple and easy, it can operate at normal temperature, and ionic liquid and lithium salts can be made in pole piece homogeneous film formation, and then the compatibility between solid electrolyte and electrode can be effectively improved, and significantly reduce the interface impedance between solid electrolyte and electrode, the mobility of lithium ion is improved, while certain flame retardant effect can also be played.
Description
Technical field
The present invention relates to solid state cell technology field, in particular to a kind of film for reducing lithium battery interface impedance and its preparation
Methods and applications.
Background technique
Lithium secondary battery with output power, energy density is high, cyclicity is superior, memory-less effect and environmental pollution etc. are all
More advantages are widely applied in daily life, become the first choice of the rechargable power supplies of portable electronic product, are recognized as
It is most competitive Vehicular dynamic battery.But lithium secondary battery is permitted using inflammable volatile organic liquid electrolyte presence
More safety problems.Currently, the method solved is to replace organic liquid electrolyte using solid electrolyte material.However, solid-state
There are biggish grain boundary resistance inside electrolyte, preparation method is relatively complicated, and after assembled battery, solid electrolyte and sector electrode
Face poor compatibility, interface impedance are big, it might even be possible to which big tens times to electrolyte internal driving even hundreds of times, lithium ion is in electricity
There is biggish energy barrier, these features all seriously limit the solid-state using solid electrolyte for migration at the electrolyte interface of pole
The large-scale application of lithium battery.
Summary of the invention
The present invention is proposed based on following problems and discovery:
To reduce interface impedance, interface size such as ionic liquid etc. is added between solid electrolyte and pole piece, but
Inventor has found in practice process, if being directly added dropwise or being sprayed on pole piece or lithium foil or solid electrolyte with ionic liquid
On, it often cannot uniformly be spread out because of ionic liquid dosage seldom (account for pole piece weight 1~10%), influence interface impedance
Reduced effect；And if preparation reduces the film of lithium battery interface impedance after directly mixing ionic liquid and organic solvent, can go out
The anion of existing ionic liquid causes in conjunction with lithium ion can be less with lithium ion in lithium electronics charge and discharge process, and lithium battery is not
It can work normally；And preparation reduces the film of lithium battery interface impedance after individually mixing ionic liquid with lithium salts, and can be due to liquid
Body viscosity is excessive and lithium battery is caused to be unable to regular picture.
In view of this, the present invention is directed to propose a kind of prepare the method for reducing the film of lithium battery interface impedance, to reduce admittedly
The impedance of state electrolyte and electrode interface.In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The present invention proposes a kind of method for preparing and reducing the film of lithium battery interface impedance.According to an embodiment of the invention, should
Method are as follows: ionic liquid, lithium salts and organic solvent are mixed, and obtained mixed electrolytic solution is coated on pole piece, so as to
To the film for reducing lithium battery interface impedance.
Further, the additive amount of the ionic liquid is 1~95wt% of the mixed electrolytic solution, and the lithium salts adds
Dosage is 1~80wt% of the mixed electrolytic solution,
Further, the additive amount of the ionic liquid is 5~70wt% of the mixed electrolytic solution, and the lithium salts adds
Dosage is 1~40wt% of the mixed electrolytic solution,
Further, the additive amount of the ionic liquid is 10~20wt% of the mixed electrolytic solution, the lithium salts
Additive amount is 2~10wt% of the mixed electrolytic solution.
Further, the ionic liquid be selected from pyridines, pyroles, quaternary ammonium salt, imidazoles, piperidines,
TFSI-、FSI-、PF6 -And BF4 -At least one of.
Further, the lithium salts be selected from lithium hexafluoro phosphate, lithium perchlorate, hexafluoroarsenate lithium, LiODFB,
Dioxalic acid lithium borate, lithium acetate, lithium fluoride, LiBF4, double pentafluoroethyl group sulfimide lithiums, bis trifluoromethyl sulfimide
At least one of lithium and double fluorine sulfimide lithiums,
Further, the organic solution be selected from acetone, tetrahydrofuran, methyl phenyl ethers anisole, toluene, dimethylbenzene, dichlorotoleune,
Acetonitrile, dimethyl acetamide, dimethylformamide, butyl butyrate, ethylene carbonate, propene carbonate, dimethyl carbonate, carbonic acid
At least one of methyl ethyl ester, normal propyl alcohol, isopropanol, N-Methyl pyrrolidone and pyrroles.
Further, the method for the coating is drop-coating, knife coating, spray coating method or infusion method.
Further, it is coated on pole piece after in dry environments mixing ionic liquid, lithium salts and organic solvent, in 0
The organic solvent is set to volatilize at~300 DEG C, to be reduced the film of lithium battery interface impedance.
Further, the film for reducing lithium battery interface impedance with a thickness of 1~300 micron.
Compared with the existing technology, the method that preparation of the present invention reduces the film of lithium battery interface impedance has following excellent
Gesture:
The method for the film that preparation of the present invention reduces lithium battery interface impedance is not only simple and easy, can be at normal temperature
Operation, and can make ionic liquid and lithium salts in pole piece homogeneous film formation, so can be effectively improved solid electrolyte and
Compatibility between electrode, and the interface impedance between solid electrolyte and electrode is significantly reduced, the mobility of lithium ion is improved,
Certain flame retardant effect can also be played simultaneously；It is assembled using the pole piece that surface is formed with the film of reduction lithium battery interface impedance
The solid state lithium battery arrived is not only highly-safe, also have stable output power, higher energy density, superior cyclicity and
Longer service life.
Another object of the present invention is to propose a kind of film for reducing lithium battery interface impedance, to reduce solid state lithium battery
Interface impedance.In order to achieve the above objectives, the technical scheme of the present invention is realized as follows: the present invention proposes a kind of reduction lithium battery
The film of interface impedance.According to an embodiment of the invention, the film of the reduction lithium battery interface impedance reduces lithium electricity using above-mentioned preparation
The method of the film of pond interface impedance obtains.
Compared with the existing technology, the film of the present invention for reducing lithium battery interface impedance has the advantage that the present invention
The film of the described reduction lithium battery interface impedance is not only preferable with the interface compatibility of solid electrolyte and electrode, but also can be with
The interface impedance for significantly reducing solid electrolyte and electrode, improves the mobility of lithium ion, and can also play certain resistance
Combustion effect；It is not only highly-safe that the film of the reduction lithium battery interface impedance is used for solid state lithium battery, lithium battery can also be made to have
There are stable output power, higher energy density, superior cyclicity and longer service life.
Another object of the present invention is to propose a kind of lithium battery, to further increase the advantage of solid state lithium battery.For up to
To above-mentioned purpose, the technical scheme of the present invention is realized as follows: the present invention proposes a kind of lithium battery, implementation according to the present invention
Example, reduction lithium battery circle which is had the film of above-mentioned reduction lithium battery interface impedance or obtained using above-mentioned preparation method
The film of face impedance.
Compared with the existing technology, lithium battery of the present invention has the advantage that solid in lithium battery of the present invention
The interface impedance of state electrolyte and electrode is small, and the mobility of ion is high, has more stable output power, higher energy density
With superior cyclicity, highly-safe, the service life is longer.
Another object of the present invention is to propose a kind of vehicle, to further increase the competitiveness of vehicle.It is above-mentioned to reach
Purpose, the technical scheme of the present invention is realized as follows: the present invention proposes a kind of vehicle, according to an embodiment of the invention, the vehicle
Have above-mentioned lithium battery.Compared with the existing technology, the safety of vehicle of the present invention is higher, and course continuation mileage is longer.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the charge and discharge time diagram of the battery of a comparative example of the invention；
Fig. 2 is volume change schematic diagram of the battery of a comparative example of the invention in charge and discharge process；
Fig. 3 is the charge and discharge time diagram of the battery of one embodiment of the invention；
Fig. 4 is volume change schematic diagram of the battery of one embodiment of the invention in charge and discharge process.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
According to the first aspect of the invention, the invention proposes a kind of sides of film for preparing reduction lithium battery interface impedance
Method.According to an embodiment of the invention, this method are as follows: mix ionic liquid, lithium salts and organic solvent, and obtained mixing is electric
It solves liquid to be coated on pole piece, to be reduced the film of lithium battery interface impedance.
Inventors have found that if being directly added dropwise or being sprayed on pole piece or lithium foil or on solid electrolyte with ionic liquid,
It often cannot uniformly be spread out because of ionic liquid dosage seldom (account for pole piece weight 1~10%), influence interface impedance drop
Low effect；And if preparation reduces the film of lithium battery interface impedance after directly mixing ionic liquid and organic solvent, it may appear that
The anion of ionic liquid causes in conjunction with lithium ion can be less with lithium ion in lithium electronics charge and discharge process, and lithium battery cannot
It works normally；And preparation reduces the film of lithium battery interface impedance after individually mixing ionic liquid with lithium salts, and can be due to liquid
Viscosity is excessive and lithium battery is caused to be unable to regular picture.By directly mixing ionic liquid and lithium salts with organic solvent in the present invention
It is coated on pole piece after conjunction, it is not only simple and easy and can operate at normal temperature, ionic liquid and lithium salts can also be made in pole piece
Surface homogeneous film formation, and then the interface impedance between solid electrolyte and electrode can be significantly reduced, improve the migration of lithium ion
Rate, while improving the flame retardant effect of the compatibility between solid electrolyte and electrode and solid state lithium battery.
It is retouched in detail below with reference to method of the embodiment to the film that the above-mentioned preparation of the present invention reduces lithium battery interface impedance
It states.
A specific embodiment according to the present invention, the additive amount of ionic liquid can for mixed electrolytic solution 1~
95wt%, for example, can for 5~80wt%, 10~75wt%, 20~60wt%, 1wt%, 8wt%, 16wt%, 24wt%,
32wt%, 40wt%, 48wt%, 56wt%, 64wt%, 72wt%, 80wt%, 88wt% or 95wt% etc., the addition of lithium salts
Amount can be mixed electrolytic solution 1~80wt%, such as can for 9~72wt%, 16~63wt%, 1wt%, 7wt%,
14wt%, 21wt%, 28wt%, 35wt%, 42wt%, 49wt%, 56wt%, 63wt%, 70wt%, 77wt% or 80wt%
Deng.In the present invention by the way that ionic liquid and lithium salts are mixed with organic solvent after, be not only easier to ionic liquid and lithium salts in pole
Piece surface uniformly coats, and organic solvent is volatile, so as to make ionic liquid and lithium salts in pole piece homogeneous film formation,
Also, inventor can dramatically increase ionic liquid, lithium salts it has furthermore been found that the mass ratio of ionic liquid and organic solvent is excessive
The viscosity of the mixed liquor formed with organic solvent, is unfavorable for ionic liquid and lithium salts in pole piece homogeneous film formation, and if lithium salts
Excessive with the mass ratio of organic solvent, the coating on pole piece will appear packet or even fall off, and pass through control lithium in the present invention
Salt and ionic liquid are above-mentioned additive amount, it can be ensured that ionic liquid and lithium salts can be in pole piece homogeneous film formations, and are formed
Film can be effectively reduced the interface impedance between solid electrolyte and electrode, improve ionic mobility.Preferably, ionic liquid
Additive amount can be preferably mixed electrolytic solution 5~70wt%, the additive amount of lithium salts can be preferably mixed electrolytic solution 1~
40wt%；It is highly preferred that the additive amount of ionic liquid can be 10~20wt% of mixed electrolytic solution, the additive amount of lithium salts can be with
For 2~10wt% of mixed electrolytic solution, by control lithium salts and ionic liquid it is above-mentioned additive amount in the present invention, can not only makes
The mixed liquor that ionic liquid, lithium salts and organic solvent are formed has viscosity preferably, to further be conducive to ionic liquid
With lithium salts in pole piece homogeneous film formation, more available lithium ion can also be provided, to further avoid ionic liquid
Anion causes in conjunction with lithium ion can be less with lithium ion in lithium electronics charge and discharge process, causes lithium battery cannot normal work
Make, it is possible thereby to further decrease the interface impedance between solid electrolyte and electrode, improves the mobility of lithium ion.
The type of another specific embodiment according to the present invention, intermediate ion liquid of the present invention is not particularly restricted, this
Field technical staff can select according to actual needs.For example, ionic liquid can be for selected from pyridines, pyroles, season
Ammonium salt class, imidazoles, piperidines, TFSI-、FSI-、PF6 -And BF4 -At least one of.It is possible thereby to which solid state electrolysis is effectively reduced
Interface impedance between matter and pole piece improves ionic mobility.
Another specific embodiment according to the present invention, the type of lithium salts is not particularly restricted in the present invention, this field
Technical staff can select according to actual needs.For example, lithium salts can be for selected from lithium hexafluoro phosphate (LiPF6), perchloric acid
Lithium (LiClO4), hexafluoroarsenate lithium (LiAsF6), LiODFB (LiODFB), dioxalic acid lithium borate (LiBOB), acetic acid
Lithium, lithium fluoride (LiF), LiBF4 (LiBF4), double pentafluoroethyl group sulfimide lithiums (LiBETI), bis trifluoromethyl sulphonyl
At least one of imine lithium (LiTFSI) and double fluorine sulfimide lithiums (LiFSI).It is possible thereby to provide more available lithiums from
Son, and then effectively ionic liquid is avoided to influence the mobility of ion and the regular picture of lithium battery in conjunction with lithium ion.
Another specific embodiment according to the present invention, the type of organic solvent is not particularly restricted in the present invention, this
Field technical staff can select according to actual needs.For example, organic solution be selected from acetone, tetrahydrofuran, methyl phenyl ethers anisole,
Toluene, dimethylbenzene, dichlorotoleune, acetonitrile, dimethyl acetamide, dimethylformamide, butyl butyrate, ethylene carbonate, carbonic acid
At least one of acrylic ester, dimethyl carbonate, methyl ethyl carbonate, normal propyl alcohol, isopropanol, N-Methyl pyrrolidone and pyrroles.
Thus not only ionic liquid and lithium salts can be made to be uniformly distributed in pole piece, can also had by removing organic solvent volatilization
Solvent.
Another specific embodiment according to the present invention, the method that coats is not particularly restricted in the present invention, this field
Technical staff can select according to actual needs.For example, coating method can for drop-coating, knife coating, spray coating method or
Infusion method etc..
Another specific embodiment according to the present invention, can be in dry environments by ionic liquid, lithium salts and organic molten
It is coated on pole piece after agent mixing, so that organic solvent is volatilized at 0~300 DEG C, to be reduced lithium battery interface impedance
Film.It is possible thereby to further increase the operability of the method for the film of preparation reduction lithium battery interface impedance.
Another specific embodiment according to the present invention, the thickness for reducing the film of lithium battery interface impedance can be 1
~300 microns, such as can be 5~250 microns, 12~200 microns, 18~150 microns, 1 micron, 12 microns, 23 microns, 34
Micron, 45 microns, 56 microns, 67 microns, 78 microns, 89 microns, 100 microns, 111 microns, 122 microns, 133 microns, it is 144 micro-
Rice, 155 microns, 166 microns, 177 microns, 188 microns, 199 microns, 210 microns, 221 microns, 232 microns, 243 microns,
254 microns, 265 microns, 276 microns, 287 microns, 298 microns or 300 microns etc..Inventors have found that if film is blocked up, it is real
The impedance on border is very big, cause the multiplying power of battery very poor in addition can not charge, and if lepthymenia, poor mechanical properties, very
It is easy to produce the micro-short circuit even short circuit of battery.It can ensured by control film with a thickness of 1~300 micron in the present invention
Film significantly reduces the interface impedance between solid electrolyte and pole piece while having preferable mechanical performance, improve Ion transfer
Rate, so that it is guaranteed that the solid state lithium battery safety with higher of the film with the reduction lithium battery interface impedance, stable defeated
Power, higher energy density, superior cyclicity and longer service life out.
In conclusion the method that the preparation of the above embodiment of the present invention reduces the film of lithium battery interface impedance is not only simple easy
Row, can operate, and ionic liquid and lithium salts can be made in pole piece homogeneous film formation, and then can effectively change at normal temperature
Compatibility between kind solid electrolyte and electrode, and the interface impedance between solid electrolyte and electrode is significantly reduced, it improves
The mobility of lithium ion, while certain flame retardant effect can also be played；Being formed with using surface reduces lithium battery interface impedance
Film the solid state lithium battery that assembles of pole piece it is not only highly-safe, also have stable output power, higher energy close
Degree, superior cyclicity and longer service life.
According to the second aspect of the invention, the invention proposes a kind of films for reducing lithium battery interface impedance.According to this
The embodiment of invention, the method that the film of the reduction lithium battery interface impedance reduces the film of lithium battery interface impedance using above-mentioned preparation
It obtains.The film of the reduction lithium battery interface impedance is not only preferable with the interface compatibility of solid electrolyte and electrode, but also can
To significantly reduce the interface impedance of solid electrolyte and electrode, the mobility of lithium ion is improved, and can also play certain
Fire retardation；It is not only highly-safe that the film of the reduction lithium battery interface impedance is used for solid state lithium battery, lithium battery can also be made
With stable output power, higher energy density, superior cyclicity and longer service life.It should be noted that
Technical characteristic described in the method for the film of lithium battery interface impedance is reduced in the present invention for above-mentioned preparation and effect is equally suitable
For the film of the reduction lithium battery interface impedance, details are not described herein again.
According to the third aspect of the present invention, the invention proposes a kind of lithium batteries.According to an embodiment of the invention, the lithium
The reduction lithium battery interface impedance that battery is had the film of above-mentioned reduction lithium battery interface impedance or obtained using above-mentioned preparation method
Film.The interface impedance of solid electrolyte and electrode is small in the lithium battery, and the mobility of ion is high, has more stable output work
Rate, higher energy density and superior cyclicity, highly-safe, the service life is longer.It should be noted that needle in the present invention
The film institute of film and the reduction lithium battery interface impedance obtained using above-mentioned preparation method to above-mentioned reduction lithium battery interface impedance
The technical characteristic and effect of description are equally applicable to the reduction lithium battery, and details are not described herein again.
According to the fourth aspect of the present invention, the invention proposes a kind of vehicles.According to an embodiment of the invention, the vehicle
With above-mentioned lithium battery.The vehicle is using the lithium battery of the above-mentioned film for having and reducing lithium battery interface impedance, and not only safety is more
Height, and course continuation mileage is longer, can significantly improve user experience.It should be noted that being directed to above-mentioned reduction lithium in the present invention
Technical characteristic and effect described in battery are equally applicable to the vehicle, and details are not described herein again.
A specific embodiment according to the present invention, the concrete type of vehicle is not particularly restricted in the present invention, ability
Field technique personnel can select according to actual needs.For example, the vehicle can be electric car, electric bicycle, electronic
Motorcycle or electro-tricycle etc., it is possible thereby to sufficiently meet the needs of users.
The solution of the present invention is explained below in conjunction with embodiment.It will be understood to those of skill in the art that following
Embodiment is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.Particular technique or item are not specified in embodiment
Part, it described technology or conditions or is carried out according to the literature in the art according to product description.Agents useful for same or instrument
Production firm person is not specified in device, and being can be with conventional products that are commercially available.
Comparative example 1
Under -40 DEG C of environment of dew point, by 1g PP14TFSI (ionic liquid) drop coating is on lithium foil (pole piece), solid-state in tiling
Dielectric film, last stacked on positive (NCM811) pole piece.Assembled battery carries out charge-discharge test.Charge and discharge time and battery
Capacity difference is as illustrated in fig. 1 and 2.
Comparative example 2
Under -40 DEG C of environment of dew point, by 4.6g tetrahydrofuran, 0.5g propene carbonate, 0.5g dimethyl carbonate and 2g
PP14TFSI (ionic liquid), is mixed with magnetic stirrer；On lithium foil and pole piece, 25 DEG C volatilize drop coating to organic solvent
Afterwards, solid electrolyte membrane in tiling, last stacked on positive (NCM811) pole piece.Assembled battery carries out charge-discharge test.It surveys
Test result is shown in Table 2.
Comparative example 3
Under -40 DEG C of environment of dew point, by 1.5g tetrahydrofuran, 0.5g propene carbonate, 0.5g dimethyl carbonate and 2g
PP14TFSI (ionic liquid), is mixed with magnetic stirrer；On lithium foil and pole piece, 25 DEG C volatilize drop coating to organic solvent
Afterwards, solid electrolyte membrane in tiling, last stacked on positive (NCM811) pole piece.Assembled battery carries out charge-discharge test.It surveys
Test result is shown in Table 2.
Embodiment 1
Under -40 DEG C of environment of dew point, by 4.6g tetrahydrofuran, 0.5g propene carbonate, 0.5g dimethyl carbonate, 1g
PP14TFSI (ionic liquid) and 0.3gLiTFSI, is mixed with magnetic stirrer；Drop coating on lithium foil and pole piece, 25 DEG C to
After organic solvent volatilization, solid electrolyte membrane in tiling, last stacked on positive (NCM811) pole piece.Assembled battery is filled
Discharge test.Charge and discharge time and battery capacity difference are as shown in Figures 3 and 4.
Embodiment 2
Under -40 DEG C of environment of dew point, by 4.6g tetrahydrofuran, 2g PP14TFSI (ionic liquid) and 0.6gLiTFSI is used
Magnetic stirrer mixes；Drop coating on lithium foil and pole piece, 25 DEG C after organic solvent volatilization after, solid electrolyte in tiling
Film, last stacked on positive (NCM811) pole piece.Assembled battery carries out charge-discharge test.Test result is shown in Table 2.
Embodiment 3
Under -40 DEG C of environment of dew point, by 1.5g tetrahydrofuran, 2gPP14TFSI (ionic liquid) and 0.6gLiTFSI, uses magnetic
Power blender stirs and evenly mixs；Drop coating on lithium foil and pole piece, 25 DEG C after organic solvent volatilization after, solid electrolyte membrane in tiling,
Last stacked on positive (NCM811) pole piece.Assembled battery carries out charge-discharge test.Test result is shown in Table 2.
The raw material composition and ratio of table 1 comparative example 1-3 and embodiment 1-3
The comprehensive performance for the lithium battery that table 2 comparative example 1-3 and embodiment 1-3 is prepared
Conclusion:
In conjunction with table 1-2 and Fig. 1-4 it is found that the obtained membrane impedance of embodiment 1 is minimum, first time discharge capacity and circulation
Number highest, embodiment 2 are taken second place, and by the test result of comparative example 1-3 it is found that only with ionic liquid or using ionic liquid
The lithium battery first time discharge capacity and cycle-index that the film that the mixed liquor of body and organic solvent obtains is formed are poor.As a result,
Using the impedance that ionic liquid and lithium salts are mixed to the film that re-coating is prepared in the method on anode pole piece with organic solvent
Minimum, and the discharge capacity of the lithium battery with the film and cycle performance are more preferable, i.e. the film with ionic liquid and lithium salts can be with
The interface impedance between solid electrolyte and electrode is significantly reduced, lithium battery can be obviously improved by being used for solid state lithium battery
Charge and discharge time and battery capacity.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of prepare the method for reducing the film of lithium battery interface impedance, which is characterized in that
Ionic liquid, lithium salts and organic solvent are mixed, and obtained mixed electrolytic solution is coated on pole piece, to be dropped
The film of low lithium battery interface impedance.
2. the method according to claim 1, wherein the additive amount of the ionic liquid is the mixed electrolytic solution
1~95wt%, the additive amount of the lithium salts is 1~80wt% of the mixed electrolytic solution,
Optionally, the additive amount of the ionic liquid is 5~70wt% of the mixed electrolytic solution, and the additive amount of the lithium salts is
1~40wt% of the mixed electrolytic solution,
Optionally, the additive amount of the ionic liquid is 10~20wt% of the mixed electrolytic solution, the additive amount of the lithium salts
For 2~10wt% of the mixed electrolytic solution.
3. method according to claim 1 or 2, which is characterized in that the ionic liquid be selected from pyridines, pyroles,
Quaternary ammonium salt, imidazoles, piperidines, TFSI-、FSI-、PF6 -And BF4 -At least one of.
4. method according to claim 1 or 2, which is characterized in that the lithium salts is selected from lithium hexafluoro phosphate, perchloric acid
Lithium, hexafluoroarsenate lithium, LiODFB, dioxalic acid lithium borate, lithium acetate, lithium fluoride, LiBF4, double pentafluoroethyl groups
At least one of sulfimide lithium, bis trifluoromethyl sulfimide lithium and double fluorine sulfimide lithiums,
Optionally, the organic solution be selected from acetone, tetrahydrofuran, methyl phenyl ethers anisole, toluene, dimethylbenzene, dichlorotoleune, acetonitrile,
Dimethyl acetamide, dimethylformamide, butyl butyrate, ethylene carbonate, propene carbonate, dimethyl carbonate, methyl ethyl carbonate
At least one of ester, normal propyl alcohol, isopropanol, N-Methyl pyrrolidone and pyrroles.
5. the method according to claim 1, wherein the method for the coating is drop-coating, knife coating, spray coating method
Or infusion method.
6. the method according to claim 1, wherein in dry environments by ionic liquid, lithium salts and organic molten
It is coated in pole piece after agent mixing, so that the organic solvent is volatilized, at 0~300 DEG C to be reduced lithium battery interface
The film of impedance.
7. method according to claim 1 or 6, which is characterized in that the film for reducing lithium battery interface impedance
With a thickness of 1~300 micron.
8. a kind of film for reducing lithium battery interface impedance, which is characterized in that the film for reducing lithium battery interface impedance is using power
Benefit requires the described in any item methods of 1-7 to be prepared.
9. a kind of lithium battery, which is characterized in that the lithium battery has reduction lithium battery interface impedance according to any one of claims 8
The film of film or the reduction lithium battery interface impedance being prepared using the described in any item methods of claim 1-7.
10. a kind of vehicle, which is characterized in that the vehicle has lithium battery as claimed in claim 9.
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| CN110518250A (en) * | 2019-09-06 | 2019-11-29 | 深圳先进技术研究院 | Plasticizing anode of high positive active material carrying capacity and preparation method thereof, solid state battery |
| CN114420896A (en) * | 2020-10-28 | 2022-04-29 | 中国科学院上海硅酸盐研究所 | High-rate lithium battery negative electrode piece and preparation method and application thereof |
| CN114530635A (en) * | 2021-06-30 | 2022-05-24 | 湘潭大学 | Method for treating garnet type solid electrolyte and anode interface by ionic liquid |
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