CN109888387B - Capacitor battery electrolyte and preparation method thereof - Google Patents
Capacitor battery electrolyte and preparation method thereof Download PDFInfo
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- CN109888387B CN109888387B CN201910104361.3A CN201910104361A CN109888387B CN 109888387 B CN109888387 B CN 109888387B CN 201910104361 A CN201910104361 A CN 201910104361A CN 109888387 B CN109888387 B CN 109888387B
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- lithium
- capacitor battery
- electrolyte
- battery electrolyte
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- 239000003990 capacitor Substances 0.000 title claims abstract description 34
- 239000003792 electrolyte Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 8
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims abstract description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 7
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims abstract description 6
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 claims abstract description 6
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 6
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims abstract description 6
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 claims abstract description 6
- 229940014800 succinic anhydride Drugs 0.000 claims abstract description 6
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- DFPAKSUCGFBDDF-UHFFFAOYSA-N Nicotinamide Chemical compound NC(=O)C1=CC=CN=C1 DFPAKSUCGFBDDF-UHFFFAOYSA-N 0.000 claims description 16
- 229960003966 nicotinamide Drugs 0.000 claims description 8
- 235000005152 nicotinamide Nutrition 0.000 claims description 8
- 239000011570 nicotinamide Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 4
- PQAMFDRRWURCFQ-UHFFFAOYSA-N 2-ethyl-1h-imidazole Chemical compound CCC1=NC=CN1 PQAMFDRRWURCFQ-UHFFFAOYSA-N 0.000 claims description 3
- WTAYIFXKJBMZLY-XZABIIKCSA-N OCC(O)CO.OCC(O)CO.OCC(O)CO.OCC(O)CO.OCC(O)CO.OCC(O)CO.CCCCCCCC\C=C/CCCCCCCC(O)=O Chemical compound OCC(O)CO.OCC(O)CO.OCC(O)CO.OCC(O)CO.OCC(O)CO.OCC(O)CO.CCCCCCCC\C=C/CCCCCCCC(O)=O WTAYIFXKJBMZLY-XZABIIKCSA-N 0.000 claims description 3
- XLYDDTRTCYCGPT-UHFFFAOYSA-N difluoromethylsilane Chemical compound FC(F)[SiH3] XLYDDTRTCYCGPT-UHFFFAOYSA-N 0.000 claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract description 12
- XRRDNAZMVAXXQP-UHFFFAOYSA-N difluoro(dimethyl)silane Chemical compound C[Si](C)(F)F XRRDNAZMVAXXQP-UHFFFAOYSA-N 0.000 abstract description 6
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 12
- 239000002904 solvent Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 229920000223 polyglycerol Polymers 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 125000004494 ethyl ester group Chemical group 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- SYRDSFGUUQPYOB-UHFFFAOYSA-N [Li+].[Li+].[Li+].[O-]B([O-])[O-].FC(=O)C(F)=O Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-].FC(=O)C(F)=O SYRDSFGUUQPYOB-UHFFFAOYSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Secondary Cells (AREA)
- Primary Cells (AREA)
Abstract
The invention discloses a capacitor battery electrolyte, comprising: 15 parts of lithium hexafluorophosphate, 1 part of lithium difluorooxalato borate, 0.2 part of lithium tetrafluoroborate, 0.2 part of lithium difluorophosphate, 23.3 parts of ethylene carbonate, 57.3 parts of methyl ethyl carbonate, 1 part of succinic anhydride, 2 parts of 1, 3-propane sultone and 0.05 part of difluoro dimethylsilane. The invention also provides a preparation method of the capacitor battery electrolyte. The invention can improve the low-temperature performance of the capacitor battery and can inhibit the generation of hydrofluoric acid.
Description
Technical Field
The invention relates to electrolyte for various electrochemical energy storage devices, in particular to electrolyte for a capacitor battery and a preparation method thereof.
Background
The capacitor battery is a combination of a super capacitor and a lithium battery (one pole or two poles of the capacitor battery are added with super capacitor electrode materials), and compared with the lithium battery, the capacitor battery has the advantages of lower use temperature and high charging and discharging speed. However, the electrolyte of the capacitor battery at present mainly refers to the electrolyte of a lithium battery, so that the low-temperature performance of the capacitor battery is limited, and lithium hexafluorophosphate in the electrolyte is easy to generate hydrofluoric acid, so that the performance and the service life of the battery are influenced. Therefore, it is desirable to design a capacitor battery electrolyte that can overcome the above-mentioned drawbacks to some extent.
Disclosure of Invention
An object of the present invention is to provide a capacitor battery electrolyte and a method for preparing the same, which can improve low-temperature performance of a capacitor battery and can suppress generation of hydrofluoric acid.
To achieve these objects and other advantages in accordance with the present invention, there is provided a capacitor battery electrolyte comprising the following raw materials in parts by weight:
15 parts of lithium hexafluorophosphate, 1 part of lithium difluorooxalato borate, 0.2 part of lithium tetrafluoroborate, 0.2 part of lithium difluorophosphate, 23.3 parts of ethylene carbonate, 57.3 parts of methyl ethyl carbonate, 1 part of succinic anhydride, 2 parts of 1, 3-propane sultone and 0.05 part of difluoro dimethylsilane.
Preferably, the capacitor battery electrolyte further comprises: 0.1 part of polyglycerol ester.
Preferably, in the capacitor battery electrolyte, the polyglycerol ester is hexapolyglycerol monooleate.
Preferably, the capacitor battery electrolyte further comprises:
0.03 part of nicotinamide and 0.08 part of imidazole acid ethyl ester.
The invention also provides a preparation method of the capacitor battery electrolyte, which comprises the following steps:
step one, mixing the ethylene carbonate and the methyl ethyl carbonate in parts by weight to obtain a solvent, and equally dividing the solvent into two parts;
dissolving the lithium hexafluorophosphate, the lithium difluorooxalate borate, the lithium tetrafluoroborate and the lithium difluorophosphate in the first solvent to obtain a first solution;
dissolving the succinic anhydride, the 1, 3-propane sultone, the difluoro dimethylsilane, the hexa-polyglycerol monooleate, the nicotinamide and the imidazole acid ethyl ester in parts by weight in a second solvent to obtain a second solution;
and step four, dripping the second solution into the first solution, wherein the dripping process comprises a fast stage and a slow stage, the time ratio of the fast stage to the slow stage is 1:2, the volume ratio of the second solution consumed in the fast stage and the slow stage is 1:1, and a 0.3T constant magnetic field is applied to the first solution in the dripping process.
Preferably, in the preparation method of the capacitor battery electrolyte, the volume ratio of the first part of solvent to the second part of solvent is 5: 1.
The invention at least comprises the following beneficial effects:
according to the electrolyte disclosed by the invention, the difluorodimethylsilane, the hexaglycerol monooleate, the nicotinamide and the ethyl imidazolide are added, so that residual water in the electrolyte can be prevented from contacting with a fluorine-containing electrolyte, the generation of hydrofluoric acid can be inhibited, the generated hydrofluoric acid can be neutralized, the situation that the hydrofluoric acid generates gas by a side reaction in a battery to block the movement of lithium ions, the performance and the service life of the battery are further influenced, the moving speed of the lithium ions under a low-temperature condition can be improved, and the low-temperature performance of the battery is improved. In the preparation method of the capacitor battery electrolyte, the difluoromethylsilane, the hexaglycerol monooleate, the nicotinamide and the imidazole acid ethyl ester can be fully dispersed in the electrolyte to more fully play a role by adopting respective dissolution, quick-slow dropwise addition and constant magnetic field treatment.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
The capacitor battery electrolyte comprises the following raw materials in parts by weight:
15 parts of lithium hexafluorophosphate, 1 part of lithium difluorooxalato borate, 0.2 part of lithium tetrafluoroborate, 0.2 part of lithium difluorophosphate, 23.3 parts of ethylene carbonate, 57.3 parts of methyl ethyl carbonate, 1 part of succinic anhydride, 2 parts of 1, 3-propane sultone, 0.05 part of difluoromethylsilane, 0.1 part of polyglycerol ester, 0.03 part of nicotinamide and 0.08 part of ethyl imidazolate.
The polyglycerol ester is hexapolyglycerol monooleate.
The preparation method of the capacitor battery electrolyte comprises the following steps:
step one, mixing the ethylene carbonate and the ethyl methyl carbonate in parts by weight to obtain a solvent, and dividing the solvent into two parts, wherein the volume ratio of the first part of the solvent to the second part of the solvent is 5: 1.
Dissolving the lithium hexafluorophosphate, the lithium difluorooxalate borate, the lithium tetrafluoroborate and the lithium difluorophosphate in the first solvent to obtain a first solution;
dissolving the succinic anhydride, the 1, 3-propane sultone, the difluoro dimethylsilane, the hexa-polyglycerol monooleate, the nicotinamide and the imidazole acid ethyl ester in parts by weight in a second solvent to obtain a second solution;
and step four, dripping the second solution into the first solution, wherein the dripping process comprises a fast stage and a slow stage, the time ratio of the fast stage to the slow stage is 1:2, the volume ratio of the second solution consumed in the fast stage and the slow stage is 1:1, and a 0.3T constant magnetic field is applied to the first solution in the dripping process.
Comparative example 1
Difluoro dimethylsilane, hexa-polyglycerol monooleate, nicotinamide and ethyl imidate were not added, and the rest of the parameters were identical to those in example 1, and the process was also identical.
Comparative example 2
All the raw materials were directly mixed without performing the dissolution, the rapid-slow dropping and the constant magnetic field treatment, and the remaining parameters were completely the same as those in example 1, and the process was also completely the same.
Test of
The electrolytes were prepared by the methods of the above example 1, comparative example 1 and comparative example 2, and a positive electrode sheet was made of graphite and activated carbon as positive electrode materials and a negative electrode sheet was made of LTO and activated carbon as negative electrode materials, all of which were used to fabricate a capacitor cell (cylindrical steel can cell, diameter 15mm, height 50mm) according to a conventional method. The internal resistance of the capacitor battery obtained by testing is obviously reduced, and the alternating current internal resistance results are shown in table 1, and the results of the discharge capacity retention rate at minus 40 ℃ and minus 20 ℃ are respectively shown in table 2 and table 3.
TABLE 1
TABLE 2
| RT discharge capacity mAh | Discharge capacity mAh at-40 ℃ | Retention of discharge capacity at-40 DEG C | |
| Example 1 | 510.9 | 333.10 | 65.20％ |
| Comparative example 1 | 500.5 | 115.62 | 23.10％ |
| Comparative example 2 | 506.3 | 177.21 | 35.00％ |
TABLE 3
| RT discharge capacity mAh | Discharge capacity mAh at-20 DEG C | Retention of discharge capacity at-20 DEG C | |
| Example 1 | 510.9 | 424.15 | 83.02％ |
| Comparative example 1 | 500.5 | 202.84 | 40.53％ |
| Comparative example 2 | 506.3 | 243.13 | 48.03％ |
As can be seen from Table 1, the alternating current internal resistance of the capacitor battery is lower in the example 1, and as can be seen from tables 2 and 3, the capacity retention rate of the capacitor battery at-40 ℃ and-20 ℃ in the example 1 is higher than that of the capacitor battery in the comparative examples 1 and 2, so that the alternating current internal resistance of the capacitor battery can be obviously reduced, and the low-temperature performance of the capacitor battery can be improved.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the capacitor cell electrolyte of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (1)
1. The capacitor battery electrolyte is characterized by comprising the following raw materials in parts by weight:
15 parts of lithium hexafluorophosphate, 1 part of lithium difluorooxalato borate, 0.2 part of lithium tetrafluoroborate, 0.2 part of lithium difluorophosphate, 23.3 parts of ethylene carbonate, 57.3 parts of methyl ethyl carbonate, 1 part of succinic anhydride, 2 parts of 1, 3-propane sultone, 0.05 part of difluoromethylsilane, 0.1 part of hexaglycerol monooleate, 0.03 part of nicotinamide and 0.08 part of ethyl imidazolate.
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| CN201910104361.3A CN109888387B (en) | 2019-02-01 | 2019-02-01 | Capacitor battery electrolyte and preparation method thereof |
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| CN109888387B true CN109888387B (en) | 2021-10-08 |
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| CN112599852A (en) * | 2020-12-16 | 2021-04-02 | 漳州华锐锂能新能源科技有限公司 | Electrolyte for lithium ion battery and lithium ion battery comprising same |
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2019
- 2019-02-01 CN CN201910104361.3A patent/CN109888387B/en active Active
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| JP4450550B2 (en) * | 2002-11-21 | 2010-04-14 | 三井化学株式会社 | Non-aqueous electrolyte and secondary battery using the same |
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Effective date of registration: 20240403 Address after: 430000 No. 37, Tianyuan street, Dongxihu District, Wuhan City, Hubei Province Patentee after: Wuhan Haocheng lithium Technology Co.,Ltd. Country or region after: China Address before: No.18 Xiaguang Road, Mashan street, Binhu District, Wuxi City, Jiangsu Province Patentee before: WUXI CAPATTERY TECHNOLOGY Co.,Ltd. Country or region before: China |