CN117219445A - Positive carbon additive stabilized electrolyte and capacitor battery - Google Patents
Positive carbon additive stabilized electrolyte and capacitor battery Download PDFInfo
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- CN117219445A CN117219445A CN202310922953.2A CN202310922953A CN117219445A CN 117219445 A CN117219445 A CN 117219445A CN 202310922953 A CN202310922953 A CN 202310922953A CN 117219445 A CN117219445 A CN 117219445A
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- electrolyte
- additive
- carbon
- capacitor battery
- positive electrode
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 53
- 230000000996 additive effect Effects 0.000 title claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000000654 additive Substances 0.000 title claims abstract description 41
- 239000003990 capacitor Substances 0.000 title claims abstract description 40
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 35
- 229910013870 LiPF 6 Inorganic materials 0.000 claims abstract description 14
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims abstract description 6
- 239000011356 non-aqueous organic solvent Substances 0.000 claims abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 3
- 230000002441 reversible effect Effects 0.000 claims abstract description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 15
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 13
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000006641 stabilisation Effects 0.000 claims description 8
- 238000011105 stabilization Methods 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 229910021385 hard carbon Inorganic materials 0.000 claims description 5
- 239000004966 Carbon aerogel Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-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
- 239000000463 material Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 claims description 2
- 229910013872 LiPF Inorganic materials 0.000 claims description 2
- 101150058243 Lipf gene Proteins 0.000 claims description 2
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical group [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- 239000012046 mixed solvent Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007773 negative electrode material Substances 0.000 claims description 2
- 229910021384 soft carbon Inorganic materials 0.000 claims description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 claims 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims 1
- 238000003421 catalytic decomposition reaction Methods 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000007772 electrode material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000007086 side reaction Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 6
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 4
- 229910011328 LiNi0.6Co0.2Mn0.2O2 Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000001075 voltammogram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 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 description 1
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 238000004768 lowest unoccupied molecular orbital Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000003860 storage Methods 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 belongs to the technical field of batteries, and particularly relates to an anode carbon additive stabilized electrolyte and a capacitor battery. The positive electrode carbon additive stabilizing electrolyte of the capacitor battery comprises lithium hexafluorophosphate LiPF 6 Ammonium tetraethyltetrafluoroborate Et 4 NBF 4 And a solvent system consisting of a non-aqueous organic solvent and an additive. The electrolyte can effectively solve the problems of self-cracking of the carbon additive of the positive electrode of the capacitor battery under the high potential condition, side reactions such as gas production, electrode material falling, electrolyte consumption and the like caused by factors such as electrolyte catalytic decomposition, electrode-electrolyte interface reconstruction and the like, and the problems of expansion deformation, increase of internal resistance, obvious thermal effect, low circulation stability and the like of the battery. The capacitor battery system made of the electrolyte has high specific power and specific energy toExcellent cycle stability. The discharge capacity of the capacitor battery reaches more than 50% of rated capacity under the 10C multiplying power, and the reversible capacity retention rate of the capacitor battery for 100 times of 1C circulation is higher than 85%.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to an anode carbon additive stabilized electrolyte and a capacitor battery.
Background
With the rising endurance requirements of people on various portable electronic products, outdoor energy storage power supplies, electric automobiles and the like, and the rising requirements of heavy-load vehicle driving, portable electric tools and the like on heavy-current power supply performance, development of a high-power chemical power supply system with high specific power and high specific energy is urgent, or the high-power chemical power supply system which is charged in a short time to obtain enough electric quantity is realized, or the current which is as large as possible is provided on the premise of safety and reliability based on the minimum volume/weight, and the high-power chemical power supply system which is widely focused at present comprises a lithium ion battery, a sodium ion battery, a pseudocapacitance capacitor, an ionic capacitor (lithium/sodium/potassium ions and the like), a lead carbon battery and the like. Various high-power chemical power supply systems more or less face some technical problems to be solved when high specific capacity and high specific power performance are considered, and the capability of achieving high-density storage and rapid charge and discharge at the same time is one of the most critical challenges in battery technology.
Considering that lithium ion batteries have high energy density, super capacitors have high power density and long cycle life, in order to develop a high-power chemical power supply system with better performance to meet the requirements of high-power supply products required by the military and civilians, previous literature has shown [ Journal of colloid and interface science.2022,626:395-404; electrochimica acta.2022,413,140165], and adding a carbon additive into the positive electrode of the lithium ion battery can greatly improve the power characteristics and the cycle life of the lithium ion battery without obviously reducing the energy density. However, the self-cracking of the carbon additive of the positive electrode under the high potential condition and the side reaction problems of gas production, electrode material falling, electrolyte consumption and the like caused by factors of electrolyte catalytic decomposition, electrode-electrolyte interface reconstruction and the like, thus leading to expansion deformation, increase of internal resistance, obvious thermal effect and stable circulation of the battery; in addition, if the oxygen-containing functional groups on the surface of the carbon additive are excessive, the internal resistance of the battery may be significantly increased, and the electrochemical stability of the electrolyte may be deteriorated.
Therefore, from the aspects of stability of the carbon additive of the positive electrode and performance improvement of the capacitor battery, a novel electrolyte system needs to be developed, and the novel electrolyte system is not only suitable for the capacitor battery with the working principle of double electric layers of a super capacitor and lithium removal/lithium intercalation of a lithium ion battery, but also has high conductivity, ion diffusion coefficient and thermal stability, and meets the requirement of the high-power capacitor battery system on the use condition.
Disclosure of Invention
The invention solves the problems by adopting the technical scheme that: selectively adopting lithium salt, quaternary ammonium salt, nonaqueous organic solvent and additive for lithium ion battery and super capacitor to prepare the positive carbon additive stabilized electrolyte of the capacitor battery and the capacitor battery.
In a first aspect, the present invention provides a capacitor cell positive carbon additive stabilization electrolyte comprising lithium hexafluorophosphate LiPF 6 Ammonium tetraethyltetrafluoroborate Et 4 NBF 4 And a solvent system consisting of a non-aqueous organic solvent and an additive; the LiPF is 6 The mass concentration of the substances is 0.95 to 1.05mol L -1 ；Et 4 NBF 4 The mass concentration of the substances is 0.05 to 0.25mol L -1 The method comprises the steps of carrying out a first treatment on the surface of the The nonaqueous organic solvent is a mixed solvent composed of cyclic Ethylene Carbonate (EC) and at least one of chain diethyl carbonate (DEC), dimethyl carbonate (DMC) and Ethyl Methyl Carbonate (EMC); the additive is at least one of Vinylene Carbonate (VC) or fluoroethylene carbonate (FEC), and the mass of the additive accounts for 1-5% of the whole electrolyte system.
Preferably, the composition of the carbon additive stabilization electrolyte for the positive electrode of the capacitor cell is as follows: the electrolyte is LiPF 6 、Et 4 NBF 4 The solvent is EC and DEC, the additive is FEC, and the LiPF 6 1.0mol L -1 ，Et 4 NBF 4 0.05mol L -1 The volume ratio of EC to DEC was 1:1 and the FEC mass ratio was 5%.
In a second aspect, the present invention provides a capacitive cell using the capacitive cell positive electrode carbon additive stabilization electrolyte of the first aspect.
Preferably, the positive electrode material of the capacitor cell is lithium manganate (LiMn 2 O 4 ) Lithium cobalt oxide (LiCoO) 2 ) Lithium iron phosphate (LiFePO) 4 ) Or a composite positive electrode material composed of at least one of nickel-cobalt-manganese ternary materials and a carbon additive, wherein the carbon additive is at least one of active carbon, carbon aerogel, carbon nano tube or graphene; the negative electrode material of the capacitor battery is any one or more than two of soft carbon, hard carbon or lithium metal; the separator of the capacitor battery is any one or more than two of Polyethylene (PE) and polypropylene (PP) separators.
Further, the carbon additive accounts for 1-10% of the mass of the composite anode.
Preferably, the capacitor cell positive carbon additive stabilization electrolyte is formulated in an argon atmosphere.
Preferably, the capacitive cell is at 10C (1c=180ma g -1 ) The discharge capacity of the capacitor battery reaches more than 50% of rated capacity, and the reversible capacity retention rate of the capacitor battery is more than 85% after the capacitor battery is cycled for 100 times under 1C.
The invention has the beneficial effects that: the electrolyte prepared by the invention has higher conductivity, wider electrochemical stability window and good safety, the LUMO of the quaternary ammonium salt is lower, and the electrolyte can earlier participate in the formation process of the negative electrode SEI film, and the decomposition product replaces a lithium source required by partial film formation, so that the battery capacity and the first coulombic efficiency are increased; the quaternary ammonium salt belongs to ionic crystals, the addition of the quaternary ammonium salt increases free moving ions in unit volume in the electrolyte, improves the ion migration speed, is beneficial to the formation of an electric double layer, improves the stability of the anode carbon additive under the condition of high potential, accelerates the popularization and the use of the capacitance type lithium ion battery, improves the technical level of the existing enterprise products, serves the iterative upgrading and the application innovation of equipment,
drawings
FIG. 1 is a graph showing a comparison of linear sweep voltammogram test of an electrolyte of the present invention with a commercial electrolyte
In the figure: a-b are carbon additive anodes in commercial base electrolytes (1M LiPF 6 Linear sweep voltammogram under EC/DEC (V/v=1)), c to d are the linear sweep voltammogram of the carbon additive positive electrode under the electrolyte of the present invention, respectively, sweep rate is 0.1mV s -1 ；
The ordinate is current, the unit is mA; the abscissa is voltage, unit V (vs. Li/Li + )。
FIG. 2 is a graph showing the specific discharge capacity of the capacitor cell according to the present invention
In the figure: a to g are each 0.1C (1C=180 mAg) -1 ) Specific discharge capacity curves of the cells at 0.5C, 1C, 2C, 5C, 10C and 0.1C rates;
the ordinate is the specific capacity, and the unit is mAh g -1 The method comprises the steps of carrying out a first treatment on the surface of the The abscissa is the number of cycles without units.
FIG. 3 shows the long cycle performance of the capacitive cell of the present invention
In the figure: a and b are each 0.1C (1c=180 mA g -1 ) And a discharge specific capacity curve of the battery at 1C rate;
the ordinate is the specific capacity, and the unit is mAh g -1 The method comprises the steps of carrying out a first treatment on the surface of the The abscissa is the number of cycles without units.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings and examples, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The reagents, methods and equipment adopted by the invention are all conventional reagents, methods and equipment in the technical field.
Example 1
Preparing electrolyte in argon atmosphere, wherein the electrolyte comprises LiPF 6 、Et 4 NBF 4 The solvent is EC and DEC, the additive is FEC, and the LiPF 6 1.0mol L -1 ，Et 4 NBF 4 0.05mol L -1 The volume ratio of EC to DEC was 1:1 and the FEC mass ratio was 5%.
With lithium nickel cobalt manganate (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) The composite material of the PE and the active carbon is an anode, the hard carbon is a cathode, the PE is a diaphragm, and the capacitor battery is assembled by the electrolyte, wherein the active carbon accounts for 3% of the mass ratio of the whole anode.
In this example, the electrochemical stability window of the electrolyte of the present invention (fig. 1 c) is significantly higher than that of the base electrolyte (fig. 1 a); the initial discharge specific capacity of the obtained capacitor battery under the condition of constant current charge and discharge of 2.5-4.2V under the condition of 0.1C of nickel cobalt lithium manganate is 147.6mAh g -1 The discharge capacity at 10C was 89.3mAh g -1 The method comprises the steps of carrying out a first treatment on the surface of the The capacity of the catalyst is kept at 105.7mAh g after 200 times of 1C circulation -1 Corresponding to a capacity retention of 84.7%.
Example 2
Preparing electrolyte in argon atmosphere, wherein the electrolyte comprises LiPF 6 、Et 4 NBF 4 The solvent is EC and DMC, the additive is FEC, wherein LiPF 6 0.95mol L -1 ，Et 4 NBF 4 0.1mol L -1 The volume ratio of EC to DMC was 1:1 and the FEC mass ratio was 5%.
With lithium nickel cobalt manganate (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) The carbon aerogel composite material is an anode, the hard carbon is a cathode, the PE is a diaphragm, and the capacitor battery is assembled by the electrolyte, wherein the active carbon accounts for 5% of the mass ratio of the whole anode.
In this example, the electrochemical stability window of the electrolyte of the present invention (fig. 1 d) is significantly higher than that of the base electrolyte (fig. 1 b); the initial discharge specific capacity of the obtained capacitor battery under the condition of constant current charge and discharge of 2.5-4.2V under the condition of 0.1C of nickel cobalt lithium manganate is 148.3mAh g -1 Discharge capacity at 10C was 89.8mAh g -1 (FIG. 2); cycling 200 times at 1C keeps the capacity at 107.7mAh g -1 Corresponding to a capacity retention of 82.3% (fig. 3).
Example 3
Preparing electrolyte in argon atmosphere, wherein the electrolyte comprises LiPF 6 、Et 4 NBF 4 The solvent is EC and DEC, the additive is VC, wherein LiPF 6 1.0mol L -1 ，Et 4 NBF 4 0.05mol L -1 The volume ratio of EC to DEC is 1:1, and the VC mass ratio is 2%.
With lithium nickel cobalt manganate (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) The carbon aerogel composite material is an anode, the hard carbon is a cathode, the PE is a diaphragm, and the capacitor battery is assembled with the electrolyte, wherein the active carbon accounts for 3% of the mass ratio of the whole anode.
In this example, the electrochemical stability window of the electrolyte of the present invention (fig. 1 e) is significantly higher than that of the base electrolyte (fig. 1 a); the initial discharge specific capacity of the obtained capacitor battery under the condition of constant current charge and discharge of 2.5-4.2V under the condition of 0.1C of nickel cobalt lithium manganate is 143.8mAh g -1 The discharge capacity at 10C is kept at 87.1mAh g -1 The capacity of the material is kept at 97.4mAh g after 200 times of 1C circulation -1 Corresponding to a capacity retention of 83%.
Claims (6)
1. A positive carbon additive stabilized electrolyte for a capacitor cell, characterized in that the electrolyte comprises lithium hexafluorophosphate LiPF 6 Ammonium tetraethyltetrafluoroborate Et 4 NBF 4 And a solvent system consisting of a non-aqueous organic solvent and an additive; the LiPF is 6 The mass concentration of the substances is 0.95 to 1.05mol L -1 ；Et 4 NBF 4 The mass concentration of the substances is 0.05 to 0.25mol L -1 The method comprises the steps of carrying out a first treatment on the surface of the The nonaqueous organic solvent is a mixed solvent composed of cyclic Ethylene Carbonate (EC) and at least one of chain diethyl carbonate (DEC), dimethyl carbonate (DMC) and Ethyl Methyl Carbonate (EMC); the additive is at least one of Vinylene Carbonate (VC) or fluoroethylene carbonate (FEC), and the mass of the additive accounts for 1-5% of the whole electrolyte system.
2. The capacitive cell positive electrode carbon additive stabilization electrolyte of claim 1, wherein the composition of the capacitive cell positive electrode carbon additive stabilization electrolyte is: the electrolyte is LiPF 6 、Et 4 NBF 4 SolventsFor EC and DEC, the additive is FEC, wherein LiPF 6 1.0mol L -1 ，Et 4 NBF 4 0.05mol L -1 The volume ratio of EC to DEC was 1:1 and the FEC mass ratio was 5%.
3. A capacitive cell characterized in that the capacitive cell uses the capacitive cell positive electrode carbon additive stabilization electrolyte as described in claim 1 or 2; the positive electrode material of the capacitor battery is lithium manganate LiMn 2 O 4 Lithium cobaltate LiCoO 2 Lithium iron phosphate LiFePO 4 Or at least one of the nickel-cobalt-manganese ternary materials and a carbon additive, wherein the carbon additive is at least one of activated carbon, carbon aerogel, carbon nano tube or graphene; the negative electrode material of the capacitor battery is any one or more than two of soft carbon, hard carbon or lithium metal. The diaphragm of the capacitor battery is any one or more than two of polyethylene PE and polypropylene PP diaphragms.
4. The capacitor cell of claim 3, wherein the carbon additive comprises 1-10% of the composite positive electrode by mass.
5. The capacitive cell of claim 3, wherein the capacitive cell positive electrode carbon additive stabilization electrolyte is formulated in an argon atmosphere.
6. The capacitive cell of claim 3, wherein the capacitive cell has a discharge capacity of greater than 50% of rated capacity at 10C and a reversible capacity retention of greater than 85% for 100 cycles at 1C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310922953.2A CN117219445A (en) | 2023-07-26 | 2023-07-26 | Positive carbon additive stabilized electrolyte and capacitor battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310922953.2A CN117219445A (en) | 2023-07-26 | 2023-07-26 | Positive carbon additive stabilized electrolyte and capacitor battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117219445A true CN117219445A (en) | 2023-12-12 |
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|---|---|---|---|
| CN202310922953.2A Pending CN117219445A (en) | 2023-07-26 | 2023-07-26 | Positive carbon additive stabilized electrolyte and capacitor battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117219445A (en) |
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2023
- 2023-07-26 CN CN202310922953.2A patent/CN117219445A/en active Pending
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