CN110204473A - A kind of double center cation liquid and preparation method thereof for lithium battery - Google Patents
A kind of double center cation liquid and preparation method thereof for lithium battery Download PDFInfo
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Abstract
The invention belongs to Ionic liquids technologies fields, and in particular to a kind of double center cation liquid and preparation method thereof for lithium battery.Introducing-the CH in ionic liquid structural formula2‑O‑CH2(OEG), facilitate Li+More efficient migration can dissolve more lithium salts, and that reinforces cation transports effect, and conductivity can be improved as lithium battery electrolytes.The design of double center cations has higher chemical and thermal stability, is added in organic electrolyte as additive, can prepare nonflammable electrolyte system, improve the thermal stability of lithium battery compared to the design of unilateral chain simultaneously.
Description
Technical field
The invention belongs to Ionic liquids technologies fields, and in particular to a kind of double center cation liquid for lithium battery and
Preparation method.
Background technique
Ionic liquid, also known as ionic liquid at room temperature or room temperature molten salt, also known as nonaqueous ionic liquid, liquid organic salt
Deng.It is generally acknowledged that it is the liquid being made of completely cation and anion, having for liquid is rendered as in room temperature or near room temperature
Machine salt.
Ionic liquid causes extensive concern in many fields of chemical as a kind of novel ionizing solvent.Closely
Nian Lai, dication type ionic liquid are attracted wide attention with its excellent performance.Dication type ionic liquid is most significant
Property be embodied in fabulous thermal stability, in addition, also having the excellent performances such as high density, high viscosity and broader liquid journey.It can
For high temperature organic reaction, novel fire-resistant lubricants, GC stationary phase, all-solid-state dye-sensitized solar cell,
Potential electrolyte catalyzes and synthesizes, the complexing of selectivity and refines mercury, and potential application field is extremely extensive.
Lall etc. has synthesized a series of double ammoniums and more ammonium cation phosphorus by anion exchange with more ammonium cation chlorides
Hydrochlorate type ionic liquid.Shreeve etc. has synthesized the double pyridine ion liquids of coupling type.Armstrong etc. has synthesized a series of right
Claim and asymmetric double cationic ion liquid.
However, existing ionic liquid is used for electrolyte system, the rate charge-discharge reduced performance of battery will lead to, this is
Due to the diffusion coefficient ratio Li of ionic liquid cation+It is much larger, when carrying out charge and discharge to battery, rate of cation diffusion ratio Li+
Fastly, it migrates fast cation to be just attached to around C cathode, and is further embedded into C cathode, form blocking layer, prevent Li+It is embedding
Enter and deviates from.
Summary of the invention
The present invention devises a kind of double center cation liquid for lithium battery, introduced in ionic liquid structural formula-
CH2-O-CH2(OEG), facilitate Li+More efficient migration can be led to solve existing ionic liquid for electrolyte system
The problem of sending a telegraph the rate charge-discharge reduced performance in pond.Double center cation liquid are in addition to itself can be used as lithium battery electrolysis
It outside liquid, is also used as additive and is added to prepare nonflammable electrolyte system in organic electrolyte, improve lithium battery
Thermal stability, when being added in organic electrolyte, compared with the common ion liquid addictive without functional group,
The cycle performance of battery can be improved.
The double center cation liquid of pyrroles provided by the invention, structural formula are as follows:
Wherein, n=1-4.
Double center cations of the invention can dissolve more lithium salts, that reinforces cation transports effect by introducing OEG group
Fruit, to improve conductivity.The design of double center cations simultaneously compared to the design of unilateral chain, have it is higher chemically and thermally
Stability, while better compatibility is had based on cathode of the ionic liquid of pyrrolidines for lithium battery.
The present invention also provides the double center cation liquid of pyrroles: [DiMPy1O] [TFSI], [DiMPy2O] [TFSI],
The preparation method of [DiMPy3O] [TFSI], [DiMPy4O] [TFSI], the specific steps of the double center cation liquid synthesis of pyrroles
It is as follows:
(1) chloride and 1- methylpyrrole are dissolved in 10 milliliters of distillation acetonitriles, return stirring is greater than 4 hours.Then
Reaction mixture is cooled to room temperature, is stirred overnight.Solvent is rotated to vacuumize and remove after product is washed three times with 15 milliliters of ether
Remaining solvent is removed, intermediate product is obtained.
Wherein, chloride is two (chloroethyl) ethers, bis- (2- chloroethoxy) ethane of 1,2-, the chloro- 2- of 1- (2- ((2- chloroethene oxygen
Base) ethyoxyl) ethyoxyl) ethane or 1, bis- (2- (2- chloroethoxy) ethyoxyl) ethane of 2-, mole with 1- methylpyrrole
Than for 1:2.0-2.5.
(2) intermediate product obtained by step (1) is taken, is dissolved in 8 ml deionized waters, slight excess of two (trifluoro is added
Sulfonyloxy methyl) imine lithium (two (trimethyl fluoride sulfonyl) imine lithiums, (two (trimethyl fluoride sulfonyl) imine lithium (two (trifluoromethyl sulphurs
Acyl) molar ratio of imine lithium and intermediate product is 2.1:1).Mixed solution is stirred at room temperature overnight, halide anion is filled
Divide exchange, is extracted with 30 milliliters of methylene chloride.Organic layer is obtained, is added 10 milliliters of saturated brine, after sufficiently shaking up standing
Lower organic layer is taken, so three times using saturated salt solution repeated washing, organic layer is then taken to use anhydrous magnesium sulfate and activity
Charcoal is removed water, is purified.Gained organic layer further passes through alumina column chromatography method and purifies and be concentrated, and obtains under reduced pressure final
Product, the double center cation liquid brown liquids of pyrroles.
The method that the present invention synthesizes the double center cation type ionic liquids of pyrroles, operates economical and convenient, without by-product, produces
Product easy purification.Products obtained therefrom has good thermal stability.By the hydrocarbon chain length for adjusting two cation connection bases of connection
And change the structure of anions and canons, the physical and chemical performance of dication type ionic liquid can be adjusted.
The double center cation liquid of pyrroles prepared by the present invention are used to can be used as additive to original when lithium ion battery
Electrolyte is modified and adulterates, and with the raising of the ionic liquid constituents ratio, can effectively improve the fire-retardant of lithium battery
Ability greatly improves the security performance of battery.
Ionic liquid of the invention is modified and adulterates to carbonates electrolyte as additive, the carbonates
Electrolyte includes propene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) or carbonic acid
Methylethyl ester (EMC) etc., wherein common electrolyte solvent system is the electrolyte of EC-DMC or EC-DEC system, ion
Liquid is 40-50% as the dosage of additive.
The double center cation liquid of the pyrroles can also be with 1- ethyl-3-methylimidazole dicyan amine salt ([MImEt]
[DCA]) ionic liquid and lithium salts be designed to ternary electrolyte, by designing and optimizing, improve the electric conductivity of lithium ion battery
And safety.
Wherein, ionic liquid: the structural formula of [MImEt] [DCA] isIt can be used as cosolvent.
The lithium salts of use are as follows: two (trimethyl fluoride sulfonyl) imine lithiums (LiTFSI), lithium perchlorate (LiClO4), hexafluorophosphoric acid
Lithium (LiPF6)。
The dosage of lithium salts are as follows: the double center cation liquid/1- ethyl-3-methylimidazoles two of 0.5M LiTFSI in pyrroles
Cyanamide salt.
Specific application method are as follows: the ionic liquid and [MImEt] [DCA] ionic liquid for synthesizing lithium salts and the present invention
(wherein the weight ratio of ionic liquid of the invention and [MImEt] [DCA] ionic liquid is fixed as 1:1), is continuously stirring to uniformly
Ionic liquid/[MImEt] [DCA]/0.5M of (LiTFSI is completely dissolved in ionic liquid), i.e. preparation cost invention
The ternary electrolyte of LiTFSI composition.
Advantages of the present invention:
With conventional organic solvents and electrolyte phase ratio, ionic liquid of the invention has the advantages that following protrusion:
(1) liquid state range is wide, from below or near to room temperature to 300 degrees Celsius or more, it is non-combustible, have high thermal stability and
Chemical stability is easily separated with other materials, can be recycled；
(2) ionic liquid is tasteless, non-ignitable, and vapour pressure is very small, non-volatile, lost using, will not evaporate in storage, can
To be recycled, volatile organic compounds problem of environmental pollution is eliminated；
(3) conductivity is high, and electrochemical window is big, can be used as the electrolyte of many substance electrochemical research；
(4) its dissolubility to inorganic matter, organic matter and polymer, and its acid are adjusted by the design of zwitterion
Degree is adjustable to super acid；
(5) there is biggish polarity Modulatory character, viscosity is low, and density is big, can form two-phase or heterogeneous system, be suitable for
It separates solvent or constitutes reaction-separation coupling new system.
Detailed description of the invention
Fig. 1 is that the ternary electrolyte system E3a being made into the ionic liquid synthesized with embodiment 1 carries out flammable test
Effect picture.
Fig. 2 is to [DiMPy1O] [TFSI] ionic liquid of the synthesis of embodiment 1 in controllable environment hothouse in 25 DEG C, 30
DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, the results of conductivity measurement curve under different temperatures.
Fig. 3 is to E3a electrolyte in controllable environment hothouse in 25 DEG C, 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, difference
At a temperature of results of conductivity measurement curve.
Specific embodiment
Embodiment 1
(1) two (chloroethyl) ethers (4.06 grams, 28.4mmol) and (5.13 grams, 60.2mmol) of 1- methylpyrrole are dissolved
In 10 milliliters of distillation acetonitriles, return stirring 4 hours.Gained mixture is cooled to room temperature, is stirred overnight.Solvent is rotated,
After product is washed three times with 15 milliliters of ether, vacuumizes and remove remaining solvent, obtain required compound 1, the 1'- (bis- (second of oxygen
- 2 1- yl of base)) molybdenyl dichloride (1- methylpyrrole -1- base) salt (yield: 8.05g, yield 90.5%) yellow liquid.
(2) last step products therefrom 1,1'- (oxygen is bis- (- 2 1- yl of ethyl)) molybdenyl dichloride (1- methylpyrrole -1- is taken
Base) salt (1.85 grams, 5.9mmol), it is dissolved in 8 ml deionized waters, it is sub- that slight excess of two (trimethyl fluoride sulfonyls) is added
Amine lithium (LiTFSI, 3.55 grams, 12.37mmol).Mixed solution is stirred at room temperature overnight, and exchanges halide anion sufficiently,
It is extracted with 30 milliliters of methylene chloride.Organic layer is obtained, is added 10 milliliters of saturated brine, sufficiently shaking up standing Hou Qu lower layer has
Then machine layer so three times using saturated salt solution repeated washing takes organic layer to be removed using anhydrous magnesium sulfate and active carbon
Water, purifying.Gained organic layer further passes through alumina column chromatography method and purifies and be concentrated under reduced pressure to final products.1,1'-
(oxygen is bis- (ethyl -2,1- yl)) bis- (1- methylpyrrole -1- base) double trifluoromethanesulfonimide salt, [DiMPy1O] [TFSI]
(yield: 3.32 grams, 70.2%) it is used as brown liquid.
The infrared spectrum of product [DiMPy1O] [TFSI]: 3563cm-1(w),2973cm-1,2901(C-H,s),
2386.94cm-1,1931.99-1797.99cm-1,1633.0cm-1 1476.73cm-1, (s=o, s), 1351.76cm-1(C-N,
w),1186.75cm-1(C-O,s),1055.42cm-1(C-F,s),999.41-876.99cm-1,789.95-740.46cm-1,
645.75-571.02cm-1.
1H NMR nucleus magnetic hydrogen spectrum: (300MHz, CDCl3):δ(ppm)3.96(m,4H),3.85–3.51(m,12H),3.04
(s,6H),2.19(m,8H).13C NMR nuclear-magnetism carbon spectrum: (300MHz, CDCl3):δ(ppm)124.02,121.9,117.7,
114.44,69.33,64.41,63.98,61.81,47.93,20.84.
The ionic liquid and [MImEt] [DCA] for first synthesizing the present embodiment according to the weight ratio of 1:1 mix, then will be appropriate
LiTFSI be added thereto, and be continuously stirring to LiTFSI and be completely dissolved in ionic liquid, be prepared into [DiMPy1O]
[TFSI]/[MImEt] [DCA]/0.5M LiTFSI ternary electrolyte (abbreviation E3a).
Fig. 1 is the flammable test effect that the ternary electrolyte system (E3a) being made into the ionic liquid with synthesis carries out
Figure.I.e. by lighting sample and recording its autoignition time (SET), flammability test is carried out.Ionic liquid is carried out with open fire bright
It burns, calcination 1s or more drops back from fire source, which is not ignited, and does not also volatilize, it was demonstrated that the ionic liquid itself is no
It is flammable, and thermal stability with higher.
Using dual electrode cell and Gamry potentiostat, to electrolyte in 25 DEG C to 70 DEG C controllable environment hothouses
Ionic conductivity is characterized.Use 0.1mol/kg KCl aqueous solution as standard solution calibration instrument conductivity value.Then use
The equipment measures [DiMPy1O] [TFSI] self-conductive rate, while also surveying to the conductivity of E3a ternary electrolyte
Amount.
Wherein, Fig. 2 be controllable environment hothouse in [DiMPy1O] [TFSI] ionic liquid 25 DEG C, 30 DEG C, 40 DEG C,
50 DEG C, 60 DEG C, 70 DEG C, the results of conductivity measurement figure under different temperatures.[DiMPy1O] [TFSI] self-conductive rate exists in Fig. 2
Conductivity is 1.23mS/cm at 25 DEG C, and conductivity is 7.39mS/cm at 70 DEG C.
Fig. 3 is to E3a electrolyte in controllable environment hothouse in 25 DEG C, 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, difference
At a temperature of conductivity measurement.The conductivity of E3a ternary electrolyte conductivity at 25 DEG C rises to 8.1mS/cm, electricity at 70 DEG C
Conductance rises to 26.6mS/cm.
Embodiment 2
[DiMPy2O] [TFSI] is prepared using similar method in embodiment 1:
1,2- bis- (2- chloroethoxy) ethane (2.99g, 16mmol), 1- methylpyrrole (2.86g, 33.6mmol) obtain
Between product (5.43g, yield 95.1%)；
Intermediate product (4.08g, 11.4mmol) and LiTFSI (6.49g, 22.6mmol) is taken to obtain final product [DiMPy2O]
[TFSI] (6.49g, yield 67.1%)；
The infrared spectrum of product [DiMPy2O] [TFSI]: 3563cm-1(w),2964cm-1,2902.84(C-H,s),
2379.03cm-1,1931.76-1798.58cm-1(w),1634.43cm-1,1463.43cm-1, (s=o, s), 1352.48cm-1
(C-N,w),1193.83cm-1(C-O,s),1054.56cm-1(C-F,s),953.83-877.41cm-1,789.69-
739.92cm-1.
1H NMR nucleus magnetic hydrogen spectrum (300MHz, CDCl3):δ(ppm)3.84(m,4H),3.73–3.50(m,16H),3.03(s,
6H),2.17(m,8H).13C NMR nuclear-magnetism carbon composes (300MHz, CDCl3):δ(ppm)124.02,121.9,117.7,114.44,
70.2,65.4,65.0,63.5,48.6,21.1.
The ionic liquid and [MImEt] [DCA] for first synthesizing embodiment 2 according to the weight ratio of 1:1 mix, then will be suitable
LiTFSI is added thereto, and is continuously stirring to LiTFSI and is completely dissolved in ionic liquid, be prepared into [DiMPy2O] [TFSI]/
The ternary electrolyte (abbreviation E4a) of [MImEt] [DCA]/0.5M LiTFSI.
The conductivity of E4a ternary electrolyte conductivity at 25 DEG C rises to 9.74mS/cm, and conductivity rises at 70 DEG C
28.5mS/cm。
Embodiment 3
[DiMPy3O] [TFSI] is prepared using similar method in embodiment 1:
The chloro- 2- of 1- (2- ((2- chloroethoxy) ethyoxyl) ethyoxyl) ethane (4.01g, 17.3mmol), 1- methylpyrrole
(3.14g, 36.9mmol) obtains intermediate product (6.58g, yield 94.5%)；
Intermediate product (2.01g, 5.0mmol) and LiTFSI (3.02g, 10.5mmol) is taken to obtain final product [DiMPy3O]
[TFSI] (3.17g, yield 71%)；
The infrared spectrum of product [DiMPy3O] [TFSI]: 3563cm-1(w),2973cm-1,2877.73(C-H,s),
2387.01cm-1,1931.61-1797.99cm-1(w),1673.96cm-1,1462.84cm-1, (s=o, s), 1352.42cm-1
(C-N,w),1193.55cm-1(C-O,s),1056.58cm-1(C-F,s),998.26-877.85cm-1,789.24-
741.40cm-1.
1H NMR nucleus magnetic hydrogen spectrum ((300MHz, CDCl3):δ(ppm)3.87(m,4H),3.75–3.54(m,20H),3.08
(s,6H),2.21(m,8H).13C NMR nuclear-magnetism carbon composes (300MHz, CDCl3):δ(ppm)124.02,121.9,117.7,
114.44,70.63,70.16,65.50,64.90,48.69,21.2.
The ionic liquid and [MImEt] [DCA] for first synthesizing embodiment 3 according to the weight ratio of 1:1 mix, then will be suitable
LiTFSI is added thereto, and is continuously stirring to LiTFSI and is completely dissolved in ionic liquid, be prepared into [DiMPy3O] [TFSI]/
The ternary electrolyte (abbreviation E5a) of [MImEt] [DCA]/0.5M LiTFSI.
The conductivity of E5a ternary electrolyte conductivity at 25 DEG C rises to 6.95mS/cm, and conductivity rises at 70 DEG C
22.1mS/cm。
Embodiment 4
[DiMPy4O] [TFSI] is prepared using similar method in embodiment 1:
Bis- (2- (2- chloroethoxy) ethyoxyl) ethane (3.02g, 11mmol) of 1,2-, 1- methylpyrrole (2.00g,
23.5mmol), intermediate product (4.02g, yield 82.4%) is obtained；
Intermediate product (2.66g, 6.0mmol) and LiTFSI (3.58g, 12.5mmol) is taken to obtain final product [DiMPy4O]
[TFSI] (3.97g, yield 70.9%)；
The infrared spectrum of product [DiMPy4O] [TFSI]: 3542cm-1(w),2880.44(C-H,s),2387.01cm-1,
1932.03-1723.60cm-1(w),1673.96cm-1,1462.71cm-1, (s=o, s), 1352.47cm-1(C-N,w),
1193.89cm-1(C-O,s),1056.94cm-1(C-F,s),998.59-839.90cm-1,789.16-740.05cm-1.
1H NMR nucleus magnetic hydrogen spectrum ((300MHz, CDCl3):δ(ppm)3.87(m,4H),3.73–3.52(m,24H),3.11
(s,6H),2.20(m,8H).13C NMR nuclear-magnetism carbon composes ((300MHz, CDCl3):δ(ppm)124.02,121.9,117.7,
114.44,70.3,70.0,65.50,64.90,48.7,21.2.
The ionic liquid and [MImEt] [DCA] for first synthesizing embodiment 4 according to the weight ratio of 1:1 mix, then will be suitable
LiTFSI is added thereto, and is continuously stirring to LiTFSI and is completely dissolved in ionic liquid, be prepared into [DiMPy4O] [TFSI]/
The ternary electrolyte (abbreviation E6a) of [MImEt] [DCA]/0.5M LiTFSI.
The conductivity of E6a ternary electrolyte conductivity at 25 DEG C rises to 4.68mS/cm, and conductivity rises at 70 DEG C
16.37mS/cm。
Double center cation ionic liquid physical properties that 1- of embodiment of the present invention embodiment 4 synthesizes are shown in Table 1.
Table 1
The present invention has also investigated double center cation ionic liquids of the synthesis of embodiment 1- embodiment 4 in various polarity and non-
Solubility situation in polar organic solvent, test result are shown in Table 2.
Table 2
M: expression can be miscible with the solvent
I: expression cannot be miscible with the solvent
Wherein, dimethyl sulfoxide (DMSO), acetonitrile (MeCN), methanol (MeOH), deionized water (H2), O ether (Et2O), two
Chloromethanes (DCM), ethyl acetate (EtOAc), acetone (Acetone), tetrahydrofuran (THF) and hexane (Hexane).
Embodiment 5
The ionic liquid of the embodiment of the present invention 1 is entrained in EC-DMC electrolyte solvent, ionic liquid content is 40%,
Mixed type electrolyte has incombustibility.
Embodiment 6
The ionic liquid of the embodiment of the present invention 1 is entrained in EC-DMC electrolyte solvent, ionic liquid content is 50%,
Obtained electrolyte is applied on graphite electrode, and stable SEI film can be formed.
Embodiment 7
(1) two (chloroethyl) ethers (4.28 grams, 30mmol) and 1- methylpyrrole (5.13 grams, 60.2mmol) are dissolved in
In 10 milliliters of distillation acetonitriles, return stirring 4 hours.Gained mixture is cooled to room temperature, is stirred overnight.Solvent is rotated, is produced
After object is washed three times with 15 milliliters of ether, vacuumizes and remove remaining solvent, obtain required compound 1, the 1'- (bis- (ethyls -2 of oxygen
1- yl)) molybdenyl dichloride (1- methylpyrrole -1- base) salt (yield: 7.51g, yield 84%) yellow liquid.Yield is substantially reduced
?.
(2) last step products therefrom 1,1'- (oxygen is bis- (- 2 1- yl of ethyl)) molybdenyl dichloride (1- methylpyrrole -1- is taken
Base) salt (1.85 grams, 5.9mmol), it is dissolved in 8 ml deionized waters, it is sub- that slight excess of two (trimethyl fluoride sulfonyls) is added
Amine lithium (LiTFSI, 3.22 grams, 11.21mmol).Mixed solution is stirred at room temperature overnight, and exchanges halide anion sufficiently,
It is extracted with 30 milliliters of methylene chloride.It obtains organic layer and obtains organic layer, be added 10 milliliters of saturated brine, sufficiently shake up standing
After take lower organic layer, so three times using saturated salt solution repeated washing, then take organic layer using anhydrous magnesium sulfate and work
Property charcoal is removed water, is purified.Gained organic layer further passes through alumina column chromatography method and purifies and be concentrated under reduced pressure to final
Product.Bis- (1- methylpyrrole -1- base) the double trifluoromethanesulfonimide salt of 1,1'- (oxygen is bis- (ethyl -2,1- yl)),
[DiMPy1O] [TFSI] (yield: 3.02 grams, 63%) it is used as brown liquid.Yield significantly reduces.
Claims (9)
1. a kind of double center cation liquid of pyrroles, which is characterized in that the molecular structural formula of the ionic liquid is as follows:
Wherein, n=1-4.
2. a kind of preparation method of the double center cation liquid of pyrroles as described in claim 1, which is characterized in that the preparation
Method and step is as follows:
(1) chloride and 1- methylpyrrole are dissolved in 10 milliliters of distillation acetonitriles, return stirring is greater than 4 hours；Gained reaction
Mixture is cooled to room temperature, and is stirred overnight, and solvent is rotated, and after product is washed three times with 15 milliliters of ether, it is remaining to vacuumize removing
Solvent, obtain intermediate product；
(2) intermediate product obtained by step (1) is taken, is dissolved in 8 ml deionized waters, according to two (trimethyl fluoride sulfonyl) imine lithiums
Molar ratio with intermediate product is that two (trimethyl fluoride sulfonyl) imine lithiums are added in 2.1:1, and mixed solution was stirred at room temperature
Night exchanges halide anion sufficiently, is extracted with 30 milliliters of methylene chloride, and organic layer is obtained, and 10 milli of saturated brine is added
It rises, takes lower organic layer after sufficiently shaking up standing, three times using saturated salt solution repeated washing, then take organic layer to use anhydrous
Magnesium sulfate and active carbon are removed water, are purified, and gained organic layer is purified and is concentrated by alumina column chromatography method, and decompression obtains double
Center cation liquid brown liquid.
3. the preparation method of the double center cation liquid of pyrroles as claimed in claim 2, it is characterised in that: step (1) is described
Chloride is two (chloroethyl) ethers, bis- (2- chloroethoxy) ethane of 1,2-, the chloro- 2- of 1- (2- ((2- chloroethoxy) ethyoxyl) second
Oxygroup) ethane or 1, bis- (2- (2- chloroethoxy) ethyoxyl) ethane of 2-, the molar ratio with 1- methylpyrrole is 1:2.0-
2.5。
4. a kind of application of the double center cation liquid of pyrroles as described in claim 1, which is characterized in that during the pyrroles is double
Heart-yang ionic liquid is modified and adulterates to original electrolyte as additive, or is designed to other ionic liquids and lithium salts
For ternary electrolyte.
5. the application of the double center cation liquid of pyrroles as claimed in claim 4, which is characterized in that the double center cations of pyrroles
Liquid is modified and adulterates to carbonates electrolyte as additive, wherein the double center cation volumes of pyrroles are
40-50%.
6. the application of the double center cation liquid of pyrroles as claimed in claim 5, which is characterized in that the carbonates electrolysis
Liquid includes propene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC) or methyl
Ethyl ester (EMC).
7. the application of the double center cation liquid of pyrroles as claimed in claim 5, which is characterized in that the carbonates electrolysis
Liquid is the electrolyte of EC-DMC or EC-DEC system.
8. the application of the double center cation liquid of pyrroles as claimed in claim 4, which is characterized in that heart-yang during the pyrroles is double
Ionic liquid and 1- ethyl-3-methylimidazole dicyan amine salt ([MImEt] [DCA]) and lithium salts are designed to ternary electrolyte.
9. the application of the double center cation liquid of pyrroles as claimed in claim 8, which is characterized in that [MImEt] [DCA]
Structural formula are as follows:The lithium salts are as follows: two (trimethyl fluoride sulfonyl) imine lithiums (LiTFSI), lithium perchlorate
(LiClO4) or lithium hexafluoro phosphate (LiPF6), wherein concentration of the lithium salts in ternary dielectric is 0.5M；During pyrroles is double heart-yangs from
The mass ratio of sub- liquid and 1- ethyl-3-methylimidazole dicyan amine salt is 1:1.
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