CN115663288A - Electrolyte for improving hard carbon cycle stability and application of electrolyte in energy storage sodium ion battery - Google Patents
Electrolyte for improving hard carbon cycle stability and application of electrolyte in energy storage sodium ion battery Download PDFInfo
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- CN115663288A CN115663288A CN202211637354.8A CN202211637354A CN115663288A CN 115663288 A CN115663288 A CN 115663288A CN 202211637354 A CN202211637354 A CN 202211637354A CN 115663288 A CN115663288 A CN 115663288A
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- electrolyte
- sodium
- hard carbon
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- cycle stability
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 64
- 229910021385 hard carbon Inorganic materials 0.000 title claims abstract description 40
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 37
- 238000004177 carbon cycle Methods 0.000 title claims abstract description 21
- 238000004146 energy storage Methods 0.000 title claims abstract description 10
- 239000002000 Electrolyte additive Substances 0.000 claims abstract description 11
- 239000003960 organic solvent Substances 0.000 claims abstract description 9
- 239000011734 sodium Substances 0.000 claims abstract description 7
- 159000000000 sodium salts Chemical class 0.000 claims abstract description 7
- -1 ether compound Chemical class 0.000 claims description 28
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 24
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 8
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 4
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 claims description 4
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 claims description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 claims description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-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
- VCCATSJUUVERFU-UHFFFAOYSA-N sodium bis(fluorosulfonyl)azanide Chemical compound FS(=O)(=O)N([Na])S(F)(=O)=O VCCATSJUUVERFU-UHFFFAOYSA-N 0.000 claims description 2
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 claims description 2
- 229910001488 sodium perchlorate Inorganic materials 0.000 claims description 2
- 229910001495 sodium tetrafluoroborate Inorganic materials 0.000 claims description 2
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 claims description 2
- YLKTWKVVQDCJFL-UHFFFAOYSA-N sodium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Na+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F YLKTWKVVQDCJFL-UHFFFAOYSA-N 0.000 claims 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 2
- 229910052708 sodium Inorganic materials 0.000 abstract 2
- 229910001610 cryolite Inorganic materials 0.000 description 20
- IOXPXHVBWFDRGS-UHFFFAOYSA-N hept-6-enal Chemical compound C=CCCCCC=O IOXPXHVBWFDRGS-UHFFFAOYSA-N 0.000 description 20
- 230000014759 maintenance of location Effects 0.000 description 16
- 238000009472 formulation Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 7
- 230000001351 cycling effect Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- QXZNUMVOKMLCEX-UHFFFAOYSA-N [Na].FC(F)(F)S(=O)(=O)NS(=O)(=O)C(F)(F)F Chemical compound [Na].FC(F)(F)S(=O)(=O)NS(=O)(=O)C(F)(F)F QXZNUMVOKMLCEX-UHFFFAOYSA-N 0.000 description 1
- 125000005910 alkyl carbonate group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical compound FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229940091252 sodium supplement Drugs 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
Landscapes
- Secondary Cells (AREA)
Abstract
The invention discloses an electrolyte for improving hard carbon cycle stability and application thereof in an energy storage sodium ion battery, relates to the technical field of battery electrolytes, and discloses an electrolyte for improving hard carbon cycle stability 3 AlF 6 The electrolyte additive accounts for 0.1-2.0 wt%, the sodium salt accounts for 10-20 wt%, and the organic solvent accounts for 80-90 wt%. The invention aims to design and develop an electrolyte system for forming a stable SEI film on the surface of a hard carbon cathode aiming at poor circulation stability of the conventional energy storage sodium battery, so that the circulation stability of the energy storage sodium battery is improved.
Description
Technical Field
The invention relates to the technical field of battery electrolyte, in particular to electrolyte for improving hard carbon cycle stability and application thereof in an energy storage sodium ion battery.
Background
With the increasingly widespread use of lithium ion batteries, lithium resources, which are not abundant in the earth crust, will not be able to meet the growing huge demand, and in this context, sodium ion batteries, which have the same working principle and similar battery components as lithium ion batteries, are receiving attention again. The sodium ion battery has the advantages of low cost, environmental friendliness and the like, so the sodium ion battery has strong competitiveness in the aspect of replacing a lithium ion battery to be applied to the field of large-scale energy storage. However, the sodium ion battery has the problems of low coulombic efficiency, poor cycle stability and the like for the first time, and further application of the sodium ion battery is limited.
The sodium ion battery is low in cost, raw materials are easy to obtain, and therefore the sodium ion battery is suitable for large-scale application, one of the most suitable application scenes is an energy storage power station, the hard carbon material has the advantages of high safety, high multiplying power, low expansion, long cycle and the like, and is the optimal choice of the current sodium ion battery cathode material, but in the cycle process of the battery, the current electrolyte can generate an unstable SEI film at the hard carbon cathode, and the formation and breakage of the SEI film can influence the cycle stability of the hard carbon.
Aiming at the problems, the novel sodium ion battery electrolyte is invented, and the cycling stability of the hard carbon negative electrode is improved.
Disclosure of Invention
The invention aims to solve the technical problem that the electrolyte for improving the cycle performance of the sodium-ion battery is designed aiming at the defects of the existing electrolyte system, and a stable SEI film can be formed on the surface of a hard carbon cathode, so that the cycle stability of the battery is improved.
The invention is realized by the following technical scheme: the electrolyte for improving the hard carbon cycle stability comprises an organic solvent, a sodium salt and an electrolyte additive, wherein the molecular formula of the electrolyte additive is Na 3 AlF 6 The electrolyte additive is 0.1-2.0 wt%, the sodium salt is 10-20 wt%, and the organic solvent is 80-90 wt%.
Preferably, the organic solvent is an ether compound.
Preferably, the organic solvent is an ester compound.
Preferably, the ether compound is one or more than one of tetrahydrofuran, 1,3-dioxolane, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether.
Preferably, the ester compound is one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate.
Preferably, the sodium salt is one or more compounds selected from sodium hexafluorophosphate, sodium perchlorate, sodium tetrafluoroborate, sodium bis (fluorosulfonyl) imide and sodium bis (trifluoromethylsulfonyl) imide.
Preferably, the energy storage sodium ion battery contains any electrolyte.
The invention has the beneficial effects that: (1) The electrolyte additive added in the invention can be used as a sodium supplement additive, so that the first coulombic efficiency of the sodium-ion battery is improved; (2) The aluminum in the electrolyte additive can coat the surface of the anode of the layered oxide to inhibit the collapse of the anode; al (aluminum) 3+ Can be embedded into the hard carbon cathode, can increase the pores of the hard carbon and is beneficial to Na + Embedding, improving the battery capacity; (3) Fluorine in the electrolyte additive can form fluoro-ester or fluoro-ether, so that the thermal stability of the electrolyte can be improved; (4) The electrolyte additive added in the invention can be used as a film forming additive to form a stable SEI film on a negative electrode; the main components of the SEI film of the solid electrolyte of the ester electrolyte comprise alkyl carbonate, naF and organic components; the main components of the SEI film of the ether electrolyte solid electrolyte comprise polyether and NaF components; the SEI film of the formed ester and ether electrolyte system has good mechanical stability, and can effectively inhibit the decomposition of the electrolyte at the negative electrode.
Detailed Description
The specific techniques or conditions not indicated in the examples are all conventional methods or techniques or conditions described in the literature of the field or according to the product specifications. The reagents and instruments used are conventional products which are available from normal commercial vendors, not indicated by manufacturers.
In one embodiment, an electrolyte for improving the cycle stability of hard carbon comprises the following formula: 12.5g of sodium hexafluorophosphate, 87.4g of tetrahydrofuran, 0.1g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example two, an electrolyte for improving the cycle stability of hard carbon, which has the following formulation: 12.5g of sodium hexafluorophosphate, 87.25g of tetrahydrofuran, 0.25g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example three, an electrolyte for improving the hard carbon cycle stability, whose formulation is as follows: 12.5g of sodium hexafluorophosphate, 87g of tetrahydrofuran, 0.5g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example four, an electrolyte for improving the hard carbon cycle stability, whose formulation is as follows: 12.5g of sodium hexafluorophosphate, 86.5g of tetrahydrofuran, 1.0g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example five, an electrolyte for improving hard carbon cycle stability, having the following formulation: 12.5g sodium hexafluorophosphate, 86.25g tetrahydrofuran, 1.25g sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example six, an electrolyte for improving hard carbon cycle stability, having the following formulation: 12.5g of sodium hexafluorophosphate, 86g of tetrahydrofuran, 1.5g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example seven, an electrolyte for improving hard carbon cycle stability, having the following formulation: 12.5g of sodium hexafluorophosphate, 85.5g of tetrahydrofuran, 2.0g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Comparative example one, an electrolyte, which differs from example one only in that: no sodium hexafluoroaluminate is added; the formula is as follows: 12.5g of sodium hexafluorophosphate, 87.5g of tetrahydrofuran; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
The performance was verified as follows
Na[Ni 1/3 Fe 1/3 Mn 1/3 ]O 2 The anode is hard carbon, the cathode is hard carbon, and the hard carbon and the electrolyte are assembled into a battery as a comparison sample, and the electrochemical performance of the battery is tested.
And (4) carrying out cycle test on the prepared battery, cycling for 200 times, recording the discharge capacity of the battery at the first time and the 200 th time, and calculating the discharge retention rate. Discharge retention = first discharge capacity/200 th discharge capacity × 100%, the results are shown in table 1.
TABLE 1 discharge retention results
| Item | Number of cycles | Discharge retention rate |
| Example one | 200 | 73.5% |
| Example two | 200 | 88.6% |
| EXAMPLE III | 200 | 89.7% |
| Example four | 200 | 91.5% |
| EXAMPLE five | 200 | 93.6% |
| EXAMPLE six | 200 | 95.1% |
| EXAMPLE seven | 200 | 91.0% |
| Comparative example 1 | 200 | 65.2% |
The storage performance of the prepared battery was tested, and the capacity retention rate and the capacity recovery rate of the prepared battery were measured after storing the battery at 60 ℃ for seven days.
TABLE 2 Capacity Retention and Capacity Retention results
| Item | Temperature of | Days of storage | Capacity retention rate | Capacity ofRecovery rate |
| Example one | 60 | 7 | 81.1% | 85.9% |
| Example two | 60 | 7 | 81.9% | 86.7% |
| EXAMPLE III | 60 | 7 | 82.6% | 87.0% |
| Example four | 60 | 7 | 84% | 87.3% |
| EXAMPLE five | 60 | 7 | 85.6% | 88.0% |
| EXAMPLE six | 60 | 7 | 87.5% | 89.5% |
| EXAMPLE seven | 60 | 7 | 83% | 87.2% |
| Comparative example 1 | 60 | 7 | 80% | 85% |
The sodium ion battery has the most excellent cycle performance by adding sodium hexafluoroaluminate in a proportion of 0.1wt% to 2wt% as seen from the comparison of examples one to seven, and the cycle life of the sodium ion battery can be improved by adding sodium hexafluoroaluminate as seen from the comparison of comparative example one to examples one to seven.
Example eight, an electrolyte for improving the cycle stability of hard carbon, which has the following formulation: 12.5g of sodium hexafluorophosphate, 87.4g of tetrahydrofuran, 0.1g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example nine, an electrolyte for improving the stability of hard carbon, whose formulation is as follows: 12.5g of sodium hexafluorophosphate, 87.25g of tetrahydrofuran, 0.25g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example ten, an electrolyte for improving hard carbon cycle stability, having the following formulation: 12.5g sodium hexafluorophosphate, 87gEC 0.45 :PC 0.45 :DMC 0.1 0.5g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example eleven, an electrolyte for improving hard carbon cycle stability, having the following formulation: 12.5g sodium hexafluorophosphate, 86.5gEC 0.45 :PC 0.45 :DMC 0.1 1.0g of sodium hexafluoroaluminate; mixing the above components uniformlyAnd obtaining the sodium ion battery electrolyte.
Example twelve, an electrolyte for improving hard carbon cycling stability, having the following formulation: 12.5g sodium hexafluorophosphate, 86.25gEC 0.45 :PC 0.45 :DMC 0.1 1.25g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example thirteen, an electrolyte for improving hard carbon cycle stability, the formulation of which is as follows: 12.5g sodium hexafluorophosphate, 86gEC 0.45 :PC 0.45 :DMC 0.1 1.5g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Example fourteen, an electrolyte for improving hard carbon cycle stability, whose formulation is as follows: 12.5g sodium hexafluorophosphate, 85.5gEC 0.45 :PC 0.45 :DMC 0.1 2.0g of sodium hexafluoroaluminate; the components are uniformly mixed to obtain the sodium ion battery electrolyte.
Comparative example eight, an electrolyte, which differs from example eight only in that: no sodium hexafluoroaluminate is added; the formula is as follows: 12.5 sodium hexafluorophosphate, 87.5EC 0.45 :PC 0.45 :DMC 0.1 (ii) a The components are uniformly mixed to obtain the sodium ion battery electrolyte.
The performance was verified as follows
Na[Ni 1/3 Fe 1/3 Mn 1/3 ]O 2 The positive electrode is hard carbon, the negative electrode is hard carbon, the hard carbon and the electrolyte are assembled into a battery as a comparison sample, and the electrochemical performance of the battery is tested.
And (4) carrying out cycle test on the prepared battery, cycling for 200 times, recording the discharge capacity of the battery at the first time and the 200 th time, and calculating the discharge retention rate. Discharge retention = first discharge capacity/200 th discharge capacity × 100%, the results are shown in table 3.
TABLE 3 discharge retention results
| Item | Number of cycles | Discharge retention rate |
| Example eight | 200 | 70.3% |
| Example nine | 200 | 80.5% |
| Example ten | 200 | 84.2% |
| EXAMPLE eleven | 200 | 89.1% |
| Example twelve | 200 | 91.5% |
| EXAMPLE thirteen | 200 | 92.3% |
| Example fourteen | 200 | 90% |
| Comparative example eight | 200 | 55.6% |
The storage performance of the prepared battery was tested, and the capacity retention rate and the capacity recovery rate of the prepared battery were measured after storing the battery at 60 ℃ for seven days.
TABLE 4 Capacity Retention and Capacity Retention results
| Item | Temperature of | Days of storage | Capacity retention rate | Rate of capacity recovery |
| Example eight | 60 | 7 | 80.3% | 84.9% |
| Example nine | 60 | 7 | 81.6% | 85.2% |
| Example ten | 60 | 7 | 82.1% | 86.7% |
| EXAMPLE eleven | 60 | 7 | 83.5% | 87.5% |
| Example twelve | 60 | 7 | 85.0% | 88.0% |
| EXAMPLE thirteen | 60 | 7 | 86.9% | 88.5% |
| Example fourteen | 60 | 7 | 83% | 87.0% |
| Comparative example eight | 60 | 7 | 79% | 84.5% |
The sodium ion battery has the most excellent cycle performance by adding sodium hexafluoroaluminate in the proportion of 0.1wt% to 2wt% as seen from the eighth to fourteenth comparison examples, and the cycle life of the sodium ion battery can be improved by adding sodium hexafluoroaluminate as seen from the eighth to fourteenth comparison examples. And compared with the ester electrolyte, the ether electrolyte has better overall performance and can form a more stable SEI film.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.
Claims (7)
1. The electrolyte for improving the hard carbon cycle stability comprises an organic solvent, a sodium salt and an electrolyte additive, and is characterized in that the molecular formula of the electrolyte additive is Na 3 AlF 6 The electrolyte additive accounts for 0.1-2.0 wt%, the sodium salt accounts for 10-20 wt%, and the organic solvent accounts for 80-90 wt%.
2. The electrolyte for improving hard carbon cycle stability of claim 1, wherein the organic solvent is an ether compound.
3. The electrolyte for improving hard carbon cycle stability of claim 1, wherein the organic solvent is an ester compound.
4. The electrolyte for improving the hard carbon cycle stability of claim 2, wherein the ether compound is one or more of tetrahydrofuran, 1,3-dioxolane, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether.
5. The electrolyte for improving the hard carbon cycle stability of claim 3, wherein the ester compound is one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate.
6. The electrolyte for improving the hard carbon cycle stability of claim 1, wherein the sodium salt is one or more compounds selected from the group consisting of sodium hexafluorophosphate, sodium perchlorate, sodium tetrafluoroborate, sodium bis (fluorosulfonyl) imide and sodium bis (trifluoromethanesulfonyl) imide.
7. An energy storage sodium ion battery comprising the electrolyte of claims 1-6.
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| CN202211637354.8A CN115663288A (en) | 2022-12-20 | 2022-12-20 | Electrolyte for improving hard carbon cycle stability and application of electrolyte in energy storage sodium ion battery |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015144108A (en) * | 2013-12-27 | 2015-08-06 | 旭硝子株式会社 | Surface-modified lithium-containing complex oxide for lithium ion secondary battery positive electrode |
| CN114497706A (en) * | 2020-10-26 | 2022-05-13 | 株式会社半导体能源研究所 | Secondary battery and electronic device |
| CN114725514A (en) * | 2022-04-07 | 2022-07-08 | 北京化工大学 | Lithium or sodium ion battery electrolyte additive and application thereof |
| CN114865088A (en) * | 2022-06-10 | 2022-08-05 | 厦门首能科技有限公司 | Electrolyte for improving cycle performance of sodium ion battery |
| CN115084653A (en) * | 2022-06-15 | 2022-09-20 | 哈尔滨工业大学 | Composite electrolyte additive for improving safety and cycle performance of sodium (lithium) ion energy storage battery |
| CN115312892A (en) * | 2022-10-10 | 2022-11-08 | 宁德新能源科技有限公司 | Electrochemical device and electronic apparatus |
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- 2022-12-20 CN CN202211637354.8A patent/CN115663288A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015144108A (en) * | 2013-12-27 | 2015-08-06 | 旭硝子株式会社 | Surface-modified lithium-containing complex oxide for lithium ion secondary battery positive electrode |
| CN114497706A (en) * | 2020-10-26 | 2022-05-13 | 株式会社半导体能源研究所 | Secondary battery and electronic device |
| CN114725514A (en) * | 2022-04-07 | 2022-07-08 | 北京化工大学 | Lithium or sodium ion battery electrolyte additive and application thereof |
| CN114865088A (en) * | 2022-06-10 | 2022-08-05 | 厦门首能科技有限公司 | Electrolyte for improving cycle performance of sodium ion battery |
| CN115084653A (en) * | 2022-06-15 | 2022-09-20 | 哈尔滨工业大学 | Composite electrolyte additive for improving safety and cycle performance of sodium (lithium) ion energy storage battery |
| CN115312892A (en) * | 2022-10-10 | 2022-11-08 | 宁德新能源科技有限公司 | Electrochemical device and electronic apparatus |
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Application publication date: 20230131 |