CN109301329B - Application of dioxime derivatives in preparation of lithium ion battery electrolyte - Google Patents
Application of dioxime derivatives in preparation of lithium ion battery electrolyte Download PDFInfo
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 46
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000654 additive Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims description 27
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims description 22
- 125000000217 alkyl group Chemical group 0.000 claims description 20
- 229910003002 lithium salt Inorganic materials 0.000 claims description 14
- 159000000002 lithium salts Chemical class 0.000 claims description 14
- 239000003960 organic solvent Substances 0.000 claims description 14
- 229910052744 lithium Inorganic materials 0.000 claims description 13
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 12
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 12
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 150000001340 alkali metals Chemical group 0.000 claims description 10
- 125000004432 carbon atom Chemical group C* 0.000 claims description 10
- 229910052736 halogen Inorganic materials 0.000 claims description 10
- 150000002367 halogens Chemical class 0.000 claims description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 9
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims description 8
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 8
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 claims description 8
- WDXYVJKNSMILOQ-UHFFFAOYSA-N 1,3,2-dioxathiolane 2-oxide Chemical compound O=S1OCCO1 WDXYVJKNSMILOQ-UHFFFAOYSA-N 0.000 claims description 5
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 5
- OQXNUCOGMMHHNA-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2,2-dioxide Chemical compound CC1COS(=O)(=O)O1 OQXNUCOGMMHHNA-UHFFFAOYSA-N 0.000 claims description 5
- SJHAYVFVKRXMKG-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2-oxide Chemical compound CC1COS(=O)O1 SJHAYVFVKRXMKG-UHFFFAOYSA-N 0.000 claims description 5
- LXQJDZXMYIZZMQ-UHFFFAOYSA-N but-1-en-3-yne;carbonic acid Chemical compound C=CC#C.OC(O)=O LXQJDZXMYIZZMQ-UHFFFAOYSA-N 0.000 claims description 5
- PQYORWUWYBPJLQ-UHFFFAOYSA-N buta-1,3-diene;sulfurous acid Chemical compound C=CC=C.OS(O)=O PQYORWUWYBPJLQ-UHFFFAOYSA-N 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 claims description 5
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 5
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 5
- 239000006259 organic additive Substances 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 abstract description 6
- 229910001428 transition metal ion Inorganic materials 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract description 2
- 229910021645 metal ion Inorganic materials 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 229910013872 LiPF Inorganic materials 0.000 description 6
- 101150058243 Lipf gene Proteins 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002000 Electrolyte additive Substances 0.000 description 3
- 229910013075 LiBF Inorganic materials 0.000 description 3
- 229910001290 LiPF6 Inorganic materials 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- NFROZCGWBQDMOS-UHFFFAOYSA-N [Na].CC(=NO)C(C)=NO Chemical group [Na].CC(=NO)C(C)=NO NFROZCGWBQDMOS-UHFFFAOYSA-N 0.000 description 2
- JGUQDUKBUKFFRO-CIIODKQPSA-N dimethylglyoxime Chemical compound O/N=C(/C)\C(\C)=N\O JGUQDUKBUKFFRO-CIIODKQPSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical group [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- 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
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- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
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Abstract
The invention discloses application of dioxime derivatives in preparation of lithium ion battery electrolyte, wherein the dioxime derivatives are used as one of additives of the lithium ion battery electrolyte, can form complex precipitation with transition metal ions of a positive electrode material dissolved into the electrolyte in a circulation process, slow down the deposition of the metal ions on the surface of a negative electrode and the growth of a negative electrode SEI, and obviously improve the circulation performance of the lithium ion battery, particularly the lithium ion battery taking a nickel-containing material as the positive electrode material.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to an application of a dioxime derivative in preparation of an electrolyte of a lithium ion battery.
Background
Lithium ion batteries have been widely used in portable electronic products due to their high energy density and long cycle life. Compared with lithium cobaltate and lithium iron phosphate materials, the nickel-containing anode material has become the mainstream of the lithium ion power battery in the field of new energy automobiles due to the higher specific capacity. For example, ternary materials containing nickel and NCA materials are currently the most interesting positive electrode materials of new energy automobile power batteries, and lithium-rich materials are widely considered as the positive electrode materials of next generation power batteries.
The main problems of the lithium battery made of the nickel-containing cathode material in the using process are that the cycle performance is not ideal enough, and the main reasons are the problems of decay of the crystal structure of the nickel-containing material, accumulation of internal stress of secondary particles, dissolution of transition metal elements and the like in the cycle process. The cycle performance of the battery can be improved by carrying out material modification on the nickel-containing material, such as element phase doping and surface coating, on the one hand, and developing a proper electrolyte additive to improve the cycle performance of the nickel-containing material through electrolyte on the other hand.
In the prior art, no report is found about a relevant technology for improving the cycle performance of a nickel-containing positive electrode material by using a dioxime derivative as an electrolyte additive of a lithium ion battery and preparing an electrolyte.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides application of a dioxime derivative in preparation of lithium ion battery electrolyte.
The invention also aims to provide the lithium ion battery electrolyte.
It is yet another object of the present invention to provide a lithium ion battery.
The technical scheme of the invention is as follows:
the application of the dioxime derivative in preparing the electrolyte of the lithium ion battery, the material of the anode of the lithium ion battery contains nickel, and the structural formula of the dioxime derivative is shown in the specification
Wherein,
r1 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
r2 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
x1 is H or an alkali metal,
x2 is H or an alkali metal.
In a preferred embodiment of the present invention, the content of the dioxime derivative in the lithium ion battery electrolyte is 0.01 to 10 wt%.
In a preferred embodiment of the present invention, the lithium ion battery electrolyte further includes a lithium salt, an organic solvent, and an additive.
Further preferably, the lithium salt includes lithium hexafluorophosphate (LiPF)6) Lithium tetrafluoroborate (LiBF)4) At least one of lithium bis (oxalato) borate (LiBOB) and lithium difluoro (oxalato) borate (LiODFB); the organic solvent includes at least one of Ethylene Carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), Methyl Propyl Carbonate (MPC), and Butylene Carbonate (BC); the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, ethylene sulfite, vinyl ethylene sulfite, propylene sulfite, dimethyl sulfate and propylene sulfate.
The other technical scheme of the invention is as follows:
the electrolyte of lithium ion battery, the material of the anode of the lithium ion battery contains nickelContaining a dioxime derivative having the structural formula
Wherein,
r1 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
r2 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
x1 is H or an alkali metal,
x2 is H or an alkali metal.
In a preferred embodiment of the present invention, the content of the dioxime derivative is 0.01 to 10 wt%.
In a preferred embodiment of the present invention, a lithium salt, an organic solvent and an additive are further included.
Further preferably, the lithium salt includes lithium hexafluorophosphate (LiPF)6) Lithium tetrafluoroborate (LiBF)4) At least one of lithium bis (oxalato) borate (LiBOB) and lithium difluoro (oxalato) borate (LiODFB); the organic solvent includes at least one of Ethylene Carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), Methyl Propyl Carbonate (MPC), and Butylene Carbonate (BC); the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, ethylene sulfite, vinyl ethylene sulfite, propylene sulfite, dimethyl sulfate and propylene sulfate.
The invention adopts another technical scheme as follows:
a lithium ion battery, the material of the positive electrode of which contains nickel, comprises the lithium ion battery electrolyte.
The invention has the beneficial effects that: the dioxime derivative is used as one of the additives of the lithium ion battery electrolyte, can form complex precipitation with the transition metal ions of the anode material dissolved into the electrolyte in the circulation process, slows down the deposition of the metal ions on the surface of the cathode and the growth of the SEI of the cathode, and obviously improves the circulation performance of the lithium ion battery, particularly the lithium ion battery taking a nickel-containing material as the anode material.
Drawings
FIG. 1 is a graph comparing the retention of cycle capacity of example 6 of the present invention, comparative example 1 and comparative example 2.
Detailed Description
The technical solution of the present invention is further illustrated and described by the following detailed description.
In the following examples, the organic solvent is selected from organic solvents known to those skilled in the art, and for the convenience of the present invention, EC + EMC is selected, and the mass ratio of the two is 3: 7.
In the following examples, the electrolyte lithium salt was selected from lithium hexafluorophosphate (LiPF)6) For convenience of explanation of the present invention, the lithium salt LiPF is fixed6The concentration of (2) is 1 mol/L.
Example 1
Preparing an electrolyte: 3.00g EC and 7.00g EMC were mixed in an argon atmosphere glove box with a water content of < 5ppm, after which 1.39g LiPF, which was thoroughly dried, were slowly added to the mixed solution6Wait for LiPF6After complete dissolution, 0.115g of dimethylglyoxime was added and mixed uniformly to obtain an electrolyte.
The electrolyte comprises the following components: lithium salt LiPF6Concentration 1.0 mol. L-1The mass ratio of the organic solvent EC to EMC is 3 to 7, and the mass percentage of the additive dimethylglyoxime in the total amount of the electrolyte is 1 percent.
The battery is a purchased flexible package battery without liquid injection, and the lithium ion battery is obtained by injecting the electrolyte. The positive electrode material used by the battery is a nickel cobalt lithium manganate material, the negative electrode material is a modified natural graphite material, the designed capacity of the battery is 1000mAh, and the liquid injection amount of the battery is 4.0 g. And (3) carrying out charge-discharge cycle test on the battery on a charge-discharge instrument, wherein the test temperature is 25 ℃, the cycle multiplying power is 1C, and the charge-discharge voltage is 3.0-4.2V. The capacity retention of the battery after cycling was calculated. The calculation formula is as follows:
the nth cycle capacity retention (%) (nth cycle discharge capacity/first cycle discharge capacity) × 100%.
Example 2
In this embodiment, the additive is dimethylglyoxime monolithium, and the dimethylglyoxime monolithium accounts for 1% by mass of the total amount of the electrolyte. The rest of the procedure was the same as in example 1.
Example 3
In this embodiment, the additive is dimethylglyoxime dilithium, and the dimethylglyoxime dilithium accounts for 1% by mass of the total amount of the electrolyte. The rest of the procedure was the same as in example 1.
Example 4
In this embodiment, the additive is dimethylglyoxime monolithium, and the dimethylglyoxime monolithium accounts for 0.01% of the total amount of the electrolyte. The rest of the procedure was the same as in example 1.
Example 5
In this embodiment, the additive is dimethylglyoxime monolithium, and the dimethylglyoxime monolithium accounts for 10% by mass of the total amount of the electrolyte. The rest of the procedure was the same as in example 1.
Example 6
In this embodiment, the additive is dimethylglyoxime monolithium and vinylene carbonate, wherein dimethylglyoxime monolithium accounts for 1% by weight of the total amount of the electrolyte, and vinylene carbonate accounts for 1% by weight of the total amount of the electrolyte. The rest of the procedure was the same as in example 1.
Example 7
In this embodiment, the additive is dimethylglyoxime monosodium salt, and the dimethylglyoxime monosodium salt accounts for 1% of the total amount of the electrolyte by mass. The rest of the procedure was the same as in example 1.
Comparative example 1
In the comparative example, the electrolyte is selected from a basic electrolyte without any additive, and the electrolyte comprises the following components: lithium salt LiPF6Concentration 1.0 mol. L-1And the mass ratio of the organic solvent EC to EMC is 3 to 7. The rest of the procedure was the same as in example 1.
Comparative example 2
In the comparative example, vinylene carbonate is used as an additive, and the vinylene carbonate accounts for 2% by mass of the total amount of the electrolyte. The rest of the procedure was the same as in example 1.
Table 1 examples 1-7 and comparative examples 1-2 performance test results:
| retention ratio of 400 cycles capacity (%) | |
| Example 1 | 78.3 |
| Example 2 | 92.5 |
| Example 3 | 88.4 |
| Example 4 | 82.3 |
| Example 5 | 92.3 |
| Example 6 | 95.9 |
| Example 7 | 90.3 |
| Comparative example 1 | 68.4 |
| Comparative example 2 | 86.6 |
As can be seen from comparative example 1, the electrolyte battery without the additive was poor in cycle performance, and the capacity retention rate of the battery after 400 cycles was only 68.4%. Compared with the comparative example 1, the battery cycle performance is improved to different degrees by adding the dioxime derivatives as the electrolyte additive, wherein the improvement effect of the mono-lithium salt additive is better. From example 4, it is not preferable that the concentration of the additive is too low, and the too low concentration of the additive is insufficient to precipitate transition metal ions in the electrolyte. From examples 2 and 5, when the additive reaches a suitable concentration, the battery cycle has a significant improvement effect, and the battery cycle is not further improved by continuously increasing the concentration of the additive.
From example 6, it can be seen that the dioxime derivative additive can be used in combination with conventional additives such as vinylene carbonate, which can achieve better effects and further improve the cycle performance of the battery. As shown in fig. 1, when vinylene carbonate alone is used as an additive, the cycle decay of the battery is accelerated after the battery is cycled for a certain number of cycles, and the cycle capacity of the battery with vinylene carbonate and dimethylglyoxime monolithium salt added as additives is kept very stable.
It is obvious to those skilled in the art that the technical solution of the present invention can still obtain the same or similar technical effects as the above embodiments when changed within the following scope, and still fall into the protection scope of the present invention:
the structural formula of the dioxime derivative is shown as
Wherein,
r1 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
r2 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
x1 is H or an alkali metal,
x2 is H or an alkali metal.
In the electrolyte of the lithium ion battery, the content of the dioxime derivative is 0.01 to 10 weight percent, and the electrolyte of the lithium ion battery also comprises lithium salt, organic solvent and additive. The lithium salt includes lithium hexafluorophosphate (LiPF)6) Lithium tetrafluoroborate (LiBF)4) At least one of lithium bis (oxalato) borate (LiBOB) and lithium difluoro (oxalato) borate (LiODFB); the organic solvent includes at least one of Ethylene Carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), Methyl Propyl Carbonate (MPC), and Butylene Carbonate (BC); the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, ethylene sulfite, vinyl ethylene sulfite, propylene sulfite, dimethyl sulfate and propylene sulfate.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (7)
1. The application of the dioxime derivative in preparing the electrolyte of the lithium ion battery, the material of the anode of the lithium ion battery contains nickel, and the method is characterized in that: the structural formula of the dioxime derivative is shown as
Wherein,
r1 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
r2 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
x1 is an alkali metal and X1 is,
x2 is an alkali metal;
the lithium ion battery electrolyte also comprises lithium salt, organic solvent and additive.
2. The use of claim 1, wherein: in the lithium ion battery electrolyte, the content of the dioxime derivative is 0.01-10 wt%.
3. The use of claim 1, wherein: the lithium salt comprises at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium difluoro (oxalato) borate; the organic solvent comprises at least one of ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate and butylene carbonate; the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, ethylene sulfite, vinyl ethylene sulfite, propylene sulfite, dimethyl sulfate and propylene sulfate.
4. The utility model provides a lithium ion battery electrolyte, the anodal material of this lithium ion battery is nickel, its characterized in that: containing dioxime derivatives, the structural formula of the dioxime derivatives is
Wherein,
r1 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
r2 is H, halogen, alkyl with 1-5 carbon atoms or halogenated alkyl,
x1 is an alkali metal and X1 is,
x2 is an alkali metal;
the lithium ion battery electrolyte also comprises lithium salt, organic solvent and additive.
5. The lithium ion battery electrolyte of claim 4, wherein: the content of the dioxime derivatives is 0.01-10 wt%.
6. The lithium ion battery electrolyte of claim 4, wherein: the lithium salt comprises at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis (oxalato) borate and lithium difluoro (oxalato) borate; the organic solvent comprises at least one of ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate and butylene carbonate; the additive comprises at least one of vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, ethylene sulfite, vinyl ethylene sulfite, propylene sulfite, dimethyl sulfate and propylene sulfate.
7. The utility model provides a lithium ion battery, the material of its positive pole is nickel, its characterized in that: a lithium ion battery electrolyte according to any of claims 4 to 6.
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| CN109301329A (en) | 2019-02-01 |
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