CN109065949B - high-stability lithium battery electrolyte and lithium ion battery - Google Patents
high-stability lithium battery electrolyte and lithium ion battery Download PDFInfo
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- CN109065949B CN109065949B CN201810810618.2A CN201810810618A CN109065949B CN 109065949 B CN109065949 B CN 109065949B CN 201810810618 A CN201810810618 A CN 201810810618A CN 109065949 B CN109065949 B CN 109065949B
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 80
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 20
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 19
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 39
- -1 phosphazene lithium salt compound Chemical class 0.000 claims abstract description 25
- 239000000654 additive Substances 0.000 claims abstract description 18
- 230000000996 additive effect Effects 0.000 claims abstract description 18
- 125000001153 fluoro group Chemical group F* 0.000 claims abstract description 18
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 18
- 239000003960 organic solvent Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 11
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 4
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 4
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 4
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- WWILRPFXQMNZAX-UHFFFAOYSA-N 1,1,1-trifluoro-3-methylsulfinylpropane Chemical compound CS(=O)CCC(F)(F)F WWILRPFXQMNZAX-UHFFFAOYSA-N 0.000 claims description 2
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 claims description 2
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 2
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 2
- YEVQZPWSVWZAOB-UHFFFAOYSA-N 2-(bromomethyl)-1-iodo-4-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=CC=C(I)C(CBr)=C1 YEVQZPWSVWZAOB-UHFFFAOYSA-N 0.000 claims description 2
- DSMUTQTWFHVVGQ-UHFFFAOYSA-N 4,5-difluoro-1,3-dioxolan-2-one Chemical compound FC1OC(=O)OC1F DSMUTQTWFHVVGQ-UHFFFAOYSA-N 0.000 claims description 2
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 2
- SJHAYVFVKRXMKG-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2-oxide Chemical compound CC1COS(=O)O1 SJHAYVFVKRXMKG-UHFFFAOYSA-N 0.000 claims description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 2
- IYOMQTGPEVJQDR-UHFFFAOYSA-N B([O-])(O)O.[Li+].C(CC(=O)O)(=O)O.C(CC(=O)O)(=O)O Chemical compound B([O-])(O)O.[Li+].C(CC(=O)O)(=O)O.C(CC(=O)O)(=O)O IYOMQTGPEVJQDR-UHFFFAOYSA-N 0.000 claims description 2
- VGGLSTPSXPEEPR-UHFFFAOYSA-N CC(CO1)OC1=O.F.F.F Chemical compound CC(CO1)OC1=O.F.F.F VGGLSTPSXPEEPR-UHFFFAOYSA-N 0.000 claims description 2
- HHNHBFLGXIUXCM-GFCCVEGCSA-N cyclohexylbenzene Chemical compound [CH]1CCCC[C@@H]1C1=CC=CC=C1 HHNHBFLGXIUXCM-GFCCVEGCSA-N 0.000 claims description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 2
- AILKHAQXUAOOFU-UHFFFAOYSA-N hexanenitrile Chemical compound CCCCCC#N AILKHAQXUAOOFU-UHFFFAOYSA-N 0.000 claims description 2
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 claims description 2
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 2
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 claims description 2
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 238000000354 decomposition reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 22
- 239000002000 Electrolyte additive Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 229910020784 Co0.2O2 Inorganic materials 0.000 description 2
- 229910013716 LiNi Inorganic materials 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 229940125782 compound 2 Drugs 0.000 description 1
- 229940126214 compound 3 Drugs 0.000 description 1
- 229940125898 compound 5 Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 206010016766 flatulence Diseases 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical group FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a high-stability lithium battery electrolyte and a lithium ion battery, which comprise an organic solvent, a lithium salt electrolyte, a film forming additive and a lithium salt additive with the mass fraction of 0.1-10%, wherein the lithium salt additive is a fluoro organic phosphazene lithium salt compound. The organic phosphazene lithium salt compound added in the invention is beneficial to forming a film on a positive electrode and a negative electrode, especially forming a stable interface film under high voltage, preventing the oxidation reaction of the electrolyte and the surface of the material, and inhibiting the decomposition of the electrolyte, thereby ensuring the full play of the electrical property of the lithium ion battery.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and particularly relates to a high-stability lithium battery electrolyte and a lithium ion battery.
Background
The lithium ion battery as a novel green high-energy battery has the advantages of high single voltage, high energy and power density, long service life, no memory effect, no pollution and the like, and is widely applied to daily life of people. However, as the lithium ion battery is increasingly marketed, the demand of people for the performance of the battery is higher and higher, especially the demand of the lithium battery for high energy density is an important embodiment of the practical application value of the lithium ion battery. The improvement of the working voltage of the lithium battery is one of effective ways for improving the energy density of the lithium battery, but the main problem in the application process is that the electrochemical stability window of the carbonate-based electrolyte for commercial use at present is low, and when the battery reaches about 4.5V (vs. Li/Li +), the electrolyte can be subjected to severe oxidative decomposition, so that the capacity of the battery is rapidly attenuated, and therefore, the improvement of the stability of the electrolyte under high voltage is of great importance.
Therefore, the novel organic phosphazene lithium salt compound is added, and the additive is favorable for forming a film on a positive electrode and a negative electrode, improves the oxidation resistance of the electrolyte, forms a stable and compact interface film under high voltage, prevents the oxidation reaction of the electrolyte and the surface of a material, and inhibits the decomposition of the electrolyte, thereby ensuring the full play of the electrical property of the lithium ion battery.
Disclosure of Invention
in view of the problems in the background art, an object of the present invention is to provide a high-stability lithium battery electrolyte and a lithium ion battery, which can improve the energy density of the lithium battery, and can also form a film on the surfaces of the positive and negative electrodes to prevent the oxidation reaction of the electrolyte on the surfaces of the electrodes, thereby inhibiting the decomposition of the electrolyte, and improving the cycle stability and the electrical performance of the battery.
In order to achieve the purpose, the invention adopts the technical scheme that:
The high-stability lithium battery electrolyte comprises an organic solvent, a lithium salt electrolyte, a film forming additive and a lithium salt additive with the mass fraction of 0.1-10%, wherein the lithium salt additive is a fluoro organic phosphazene lithium salt compound, and the structural formula of the fluoro organic phosphazene lithium salt compound is as follows:
wherein R1 and R2 are alkyl groups having 1 to 4 carbon atoms or partially or completely fluorinated alkyl groups.
In a further scheme, the added mass of the film forming additive accounts for 0.1-5% of the total mass of the electrolyte, the added mass of the organic solvent accounts for 60-85% of the total mass of the electrolyte, and the balance is lithium salt electrolyte.
In a further scheme, the film forming additive is at least one of vinylene carbonate, ethylene sulfate, 1, 3-propane sultone, fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, propylene carbonate trifluoride, acrylonitrile, propylene sulfite, ethylene carbonate, dimethyl sulfoxide, 3,3, 3-trifluoropropylmethyl sulfoxide, cyclohexylbenzene and trioctyl phosphate.
in a further scheme, the organic solvent is one or a mixture of diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propylene carbonate, ethyl acetate, ethyl propionate, hexanenitrile and N-N-dimethylformamide.
Further, the lithium salt electrolyte is at least one of lithium hexafluorophosphate, lithium bis (oxalato) borate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethanesulfonyl) imide, lithium tetrafluoroborate, lithium difluorooxalato borate, lithium dimalonate borate, and the like.
In a further scheme, the concentration of the lithium salt electrolyte is 0.8-1.5 mol/L.
Another object of the present invention is to provide a lithium ion battery comprising the electrolyte as described above.
The invention adds the fluoro organic phosphazene lithium salt compound as the lithium salt additive, and the fluoro organic phosphazene lithium salt compound can form an organic film on the surfaces of the anode and the cathode due to the fluoro benzene ring group, and simultaneously improves the oxidation resistance of the electrolyte and forms a stable and compact interfacial film under high voltage to prevent the oxidation reaction of the electrolyte and the material surface, thereby ensuring the full play of the electrical property of the lithium ion battery.
in addition, the number of carbon atoms in the straight-chain alkyl group or the partially or completely fluorinated alkyl group in the fluorinated organic phosphazene lithium salt compound added in the invention is 1-4, because if the alkyl chain is increased, the viscosity and the solubility of the electrolyte are increased.
Compared with the prior art, the electrolyte contains the special lithium salt additive which is a fluoro organic phosphazene lithium salt compound, can effectively improve the electrochemical window and stability of the electrolyte, has higher oxidation resistance and decomposition energy, and improves the voltage resistance of the electrolyte. Meanwhile, the combination of the electrolyte additive and the film additive can effectively improve the matching of an electrode material and an electrolyte and can effectively form a stable SEI film.
The electrolyte can improve the energy density of the lithium battery, and can form a film on the surfaces of the positive electrode and the negative electrode to prevent the oxidation reaction of the electrolyte on the surface of the electrode, thereby better inhibiting the decomposition of the electrolyte and improving the cycle stability and the full play of the electrical property of the battery.
therefore, the high-voltage electrolyte provided by the invention has high pressure resistance, no flatulence and good matching performance, and can prolong the cycle life of the lithium battery.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in detail with reference to the embodiments.
The positive active material of the lithium battery used in the embodiment of the invention is selected from a ternary material (LiNi)0.6Mn0.2Co0.2O2) The cathode material is artificial graphite, and the material of the diaphragm is a 2400 diaphragm of Celgard company. The lithium ion battery assembled by the electrolyte containing different electrolyte additives is taken as an example, and the lithium ion battery assembled by the conventional electrolyte containing no electrolyte additive is taken as a comparative example.
Comparative example 1:
The preparation steps of the conventional electrolyte are as follows:
(1) In an argon-atmosphere glove box, Ethylene Carbonate (EC): ethyl Methyl Carbonate (EMC): diethyl carbonate (DEC) ═ 3: 5: 2 (vol%) to obtain a ternary mixed solvent, which accounts for 60-85% of the total weight;
(2) an appropriate amount of LiPF with the concentration of lithium salt electrolyte of 1mol/L6Adding the electrolyte into the ternary mixed solvent to obtain a blank electrolyte;
(3) And adding a film forming additive accounting for 0.1-5% of the total mass of the electrolyte into the blank electrolyte to obtain the basic electrolyte.
example 1:
In the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 1 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 2:
In the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 2 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 3:
In the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 3 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 4:
In the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 4 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 5:
In the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 5 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 6:
in the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 6 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 7:
in the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 7 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Example 8:
in the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 8 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
example 9:
In the same way as the comparative example 1, the basic electrolyte prepared in the comparative example 1 is slowly added with the fluoro organic phosphazene lithium salt compound 9 which accounts for 0.5 percent of the total mass of the electrolyte and has the structural formula shown in the specification, and the mixture is uniformly mixed and stands for later use.
Preparing a lithium ion battery:
LiNi is selected as the positive electrode active material0.6Mn0.2Co0.2O2the negative electrode material was artificial graphite, and the lithium ion battery was assembled by using a 2400 separator of Celgard corporation and injecting the electrolytes prepared in comparative example 1 and examples 1 to 9, respectively.
And (3) testing electrical properties:
And (3) cycle performance testing, namely performing charge-discharge cycle testing on 10 assembled lithium ion battery samples at working voltages of 3.0-4.4V and 0.5C/0.5C, wherein the cut-off voltage is 2.7-4.4V. Then storing at 60 deg.C for seven days, comparing internal resistance and capacity change. Specific results are shown in table 1.
TABLE 1 Electrical Properties parameters
the electrolyte prepared in the embodiments 1 to 9 and the electrolyte prepared in the comparative example 1 are compared with each other in the same manner to obtain the lithium battery, and it is found that the electrolyte of the present invention can effectively improve the first coulombic efficiency of the lithium battery due to the addition of the fluoro organophosphazene lithium salt compound, and can also improve the cycle life of the battery at high temperature and the stability of the electrolyte at high temperature.
The above embodiments are preferred embodiments of the present invention, but the gate embodiments are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. The high-stability lithium battery electrolyte comprises an organic solvent, a lithium salt electrolyte and a film-forming additive, and is characterized in that: the lithium salt additive is 0.1-10% by mass, and the lithium salt additive is a fluoro organic phosphazene lithium salt compound, and the structural formula of the fluoro organic phosphazene lithium salt compound is as follows:
Wherein R1 and R2 are alkyl groups having 1 to 4 carbon atoms or partially or completely fluorinated alkyl groups.
2. the electrolyte of claim 1, wherein: the adding mass of the film forming additive accounts for 0.1-5% of the total mass of the electrolyte, the adding mass of the organic solvent accounts for 60-85% of the total mass of the electrolyte, and the balance is lithium salt electrolyte.
3. The electrolyte of claim 1, wherein: the film forming additive is at least one of vinylene carbonate, ethylene sulfate, 1, 3-propane sultone, fluoroethylene carbonate, 1, 2-difluoroethylene carbonate, propylene carbonate trifluoride, acrylonitrile, propylene sulfite, ethylene carbonate, dimethyl sulfoxide, 3,3, 3-trifluoropropylmethyl sulfoxide, cyclohexylbenzene and trioctyl phosphate.
4. The electrolyte of claim 1, wherein: the organic solvent is one or a mixture of diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, propylene carbonate, ethyl acetate, ethyl propionate, hexanenitrile and N-N-dimethylformamide.
5. The electrolyte of claim 1, wherein: the lithium salt electrolyte is at least one of lithium hexafluorophosphate, lithium bis (oxalato) borate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethanesulfonyl) imide, lithium tetrafluoroborate, lithium difluorooxalato borate and lithium dimalonate borate.
6. The electrolyte of claim 1, wherein: the concentration of the lithium salt electrolyte is 0.8-1.5 mol/L.
7. A lithium ion battery, characterized by: comprising an electrolyte as claimed in any of claims 1 to 6.
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| CN201810810618.2A CN109065949B (en) | 2018-07-19 | 2018-07-19 | high-stability lithium battery electrolyte and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810618.2A CN109065949B (en) | 2018-07-19 | 2018-07-19 | high-stability lithium battery electrolyte and lithium ion battery |
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| US9478828B2 (en) * | 2012-12-04 | 2016-10-25 | Samsung Sdi Co., Ltd. | Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same |
| WO2016095116A1 (en) * | 2014-12-17 | 2016-06-23 | Basf Corporation | Electrolyte compositions for rechargeable lithium ion batteries |
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