AU2021105810A4 - A Preparation Method for High-performance Composite Binder of Batteries in the Energy Storage Charging System - Google Patents
A Preparation Method for High-performance Composite Binder of Batteries in the Energy Storage Charging System Download PDFInfo
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- AU2021105810A4 AU2021105810A4 AU2021105810A AU2021105810A AU2021105810A4 AU 2021105810 A4 AU2021105810 A4 AU 2021105810A4 AU 2021105810 A AU2021105810 A AU 2021105810A AU 2021105810 A AU2021105810 A AU 2021105810A AU 2021105810 A4 AU2021105810 A4 AU 2021105810A4
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- 239000011230 binding agent Substances 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000004146 energy storage Methods 0.000 title claims abstract description 17
- 239000002033 PVDF binder Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 23
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 9
- 229920002125 Sokalan® Polymers 0.000 claims description 8
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 8
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004697 Polyetherimide Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920001601 polyetherimide Polymers 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- PIGCSKVALLVWKU-UHFFFAOYSA-N 2-Aminoacridone Chemical compound C1=CC=C2C(=O)C3=CC(N)=CC=C3NC2=C1 PIGCSKVALLVWKU-UHFFFAOYSA-N 0.000 claims description 2
- 241000428352 Amma Species 0.000 claims description 2
- 101000637792 Homo sapiens Solute carrier family 35 member G5 Proteins 0.000 claims description 2
- 229920000557 Nafion® Polymers 0.000 claims description 2
- 229920002319 Poly(methyl acrylate) Polymers 0.000 claims description 2
- 229920002367 Polyisobutene Polymers 0.000 claims description 2
- 102100032019 Solute carrier family 35 member G5 Human genes 0.000 claims description 2
- WKDNYTOXBCRNPV-UHFFFAOYSA-N bpda Chemical compound C1=C2C(=O)OC(=O)C2=CC(C=2C=C3C(=O)OC(C3=CC=2)=O)=C1 WKDNYTOXBCRNPV-UHFFFAOYSA-N 0.000 claims description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- -1 poly (tert-Butyl acrylate-triethoxy vinylsilane Chemical compound 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 229920002312 polyamide-imide Polymers 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920001021 polysulfide Polymers 0.000 claims description 2
- 239000005077 polysulfide Substances 0.000 claims description 2
- 150000008117 polysulfides Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 11
- 239000007774 positive electrode material Substances 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 229910015645 LiMn Inorganic materials 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 abstract 2
- 239000002482 conductive additive Substances 0.000 abstract 1
- 230000008602 contraction Effects 0.000 abstract 1
- 229910014549 LiMn204 Inorganic materials 0.000 description 13
- 239000011267 electrode slurry Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000011888 foil Substances 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 239000011149 active material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000004584 polyacrylic acid Substances 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000012046 mixed solvent Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a preparation method for high-performance composite binder
of batteries in the energy storage charging system, which comprises the following
steps: Step A: Weigh polyvinylidene fluoride (PVDF) and an aqueous binder
according to the ratio of substance amount of 6-9:1-4, and place them in a beaker;
Step B: Under the protection of vacuum or atmosphere environment, place the beaker
on the magnetic mixer, add the rotor and mix for 5-10 minutes; Step C: Take the
evenly mixed composite powder out. The composite binder prepared by the method
can better bond the positive electrode material with conductive additives such as
conductive carbon black to form a conductive network and ion shuttle channel,
meanwhile, it can stabilize the volume expansion and contraction caused by ion
shuttle in the positive electrode material, and significantly improve the charging and
discharging cycle stability characteristics of the battery, the coulomb efficiency during
the process of battery cycle is up to 99%, so as to meet the requirements of the energy
storage charging system for long battery life.
1/2
PEO
PVDF
- LiMn 2Ole~ctrode
PDF35-0782
10 20 30 40 50 60 70 80 90
FG1
FIG.1
Description
1/2
- LiMn 2Ole~ctrode
PDF35-0782
20 30 40 50 60 70 80 90
FG1
FIG.1
A Preparation Method for High-performance Composite Binder of Batteries in the Energy Storage Charging System
Technical Field
[00011 The invention relates to the technical field of battery binder, in particular to a preparation method for high-performance composite binder of batteries in the energy storage charging system.
Background Technology
[00021 In order to effectively protect the ecological environment, lithium-ion batteries with recyclable green energy are widely used in 3C electronic products, electric vehicles, new energy storage and other fields. During the process of preparing the lithium-ion batteries, binder play a critical role in the performance of the battery, which has become one of the important auxiliary materials of lithium-ion batteries. Generally, a binder with a ratio of about 5%~10% of the positive electrode/negative electrode active material is added during the process of preparing the electrode slurry for the preparation of the pole piece. The addition of binder can ensure the uniform dispersion of key active materials in the pole piece and the mechanical integrity of the pole piece, so as to facilitate the transmission of lithium ions and electrons in the battery. Meanwhile, the binder must also maintain the adhesion force between the active material particles and the current collector so that it can be wetted by the organic electrolyte. The binder requires to have good processability and is not easy to burn, it is not only resistant to electrolyte corrosion, but also has stable electrochemical performance.
[0003] With the development and progress of the times, ordinary lithium-ion batteries can no longer meet the basic needs of people's daily life. Especially the batteries in the energy storage charging system require lithium-ion batteries with excellent performance such as large capacity, long cycle life, high power density, high working voltage, low self-discharging performance and environment-friendly. The electrochemical performance of batteries can be improved by exploring and developing new binders. Although the conventional binders can exert the electrochemical performance of batteries normally, the binders will reduce the bonding strength with the progress of electrochemical reactions, and are easy to decompose at high temperature and cause side reactions. Therefore, the batteries prepared by the conventional binder preparation method have poor cycle life of batteries and low first discharging specific capacity.
Summary of the Invention
[0004] The technical problems to be solved by the invention are: The invention provides a preparation method for high-performance composite binder of batteries in the energy storage charging system, so as to solve the technical problems of easy decomposition and instability of battery binder and poor electronic conductivity under long cycle life.
[0005] In order to solve the above technical problems, the technical solutions of the invention are as follows: A preparation method for high-performance composite binder of batteries in the energy storage charging system, which comprises the following steps:
[0006] Step A: Weigh polyvinylidene fluoride (PVDF) and an aqueous binder according to the ratio of substance amount of 6-9:1-4, and place them in a beaker;
[0007] Step B: Under the protection of vacuum or atmosphere environment, isolate the beaker from moisture in the air, place the beaker on the magnetic mixer, and add the rotor and mix evenly to obtain a composite powder;
[0008] Step C: Take the evenly mixed composite powder out.
[0009] Preferably, the aqueous binder in Step A adopts any one of polyethylene glycol (PEG), polyethylene oxide (PEO), polyacrylic acid (PAA), polyvinyl alcohol (PVA), poly (3,4-ethylenedioxythiophene) (PEDOT), polyacrylamide co-dimethylammonium chloride (AMAC), BPDA, bis-[3-(ethylene oxide ethoxy)-2-hydroxypropyl-] polysulfide (BVPS), polyvinylpyrrolidone (PVP), (butyl acrylate) (PBA), polyamide (PA), polyamide-imide (PAI), polymethylmethacrylate (PMMA), polyacrylonitrile -methyl acrylate (AMMA), poly (tert-Butyl acrylate-triethoxy vinylsilane) (TBATEVS), polyimide (PI), polyetherimide (PEI), polyethylmethacrytate, polyacrylonitrile (PAN), epoxy resin, polyurethane (PU), PTFE, PMA, Nafion, PIB, PS and PVC.
[0010] Preferably, in Step B, the mixing time is 5-10 minutes and the mixing temperature is 25°C.
[0011] Preferably, in Step A, the aqueous binder is polyethylene oxide (PEO).
[0012] Preferably, in Step A, the aqueous binder is polyacrylic acid (PAA). The technical effects obtained by adopting the above technical solutions are as follows:
[0013] The invention adopts the above technical solutions, which has the advantages that in Step 1, it adopts an aqueous binder, which is a kind of synthetic binders. Compared with natural binders, synthetic binders are more conducive to strictly control and fix the composition of binders and ensure the consistency of product performance. In Step 2, under the protection of vacuum or atmosphere environment, it uses a magnetic mixer to mix the two binder powders evenly, and the two powders can be mixed evenly through the uniform speed mixing of the rotor. The protection of vacuum or atmosphere environment can isolate the powder from contact with water vapor in the air and prevent the powder from moisture.
[00141 The invention adopts a blending method to prepare a high-performance composite binder. After adopting the method, due to the increase in the mechanical strength of the positive electrode pole piece and the increase in the electronic conductive connection sites, the reversible performance of the battery can be significantly improved, the coulomb efficiency is as high as 99%, and the cycle life of the battery can be prolonged.
Brief Description of Drawings
[0015] The invention will be further described below in combination with the drawings and the embodiments.
[0016] Figure 1 is an X-ray diffraction diagram of LiMn204 positive electrode pole piece of the preparation for composite binder of the Embodiment 1 in Figure 1;
[0017] Figure 2 is a SEM diagram of LiMn204 positive electrode and ordinary binder (a) prepared by the preparation for composite binder (a) of the Embodiment 1 in Figure 2;
[0018] Figure 3 is the first charging and discharging curve (a) at a rate of 0.2C, 150 times of charging and discharging cycle test curve (b) at a rate of 0.2C and electrochemical impedance spectroscopy diagram (c-d) of LiMn204 positive electrode prepared by the composite binder and ordinary binder of the Embodiment 1 in Figure 3.
Detailed Description of the Presently Preferred Embodiments
[0019] The preferred embodiments of the invention will be further described in detail below in combination with the drawings.
[0020] Embodiment 1:
[0021] A preparation method for high-performance composite binder of batteries in the energy storage charging system, which comprises the following steps:
[0022] A: Weigh the powder of PVDF binder and PEO according to the ratio of substance amount of 7:3, and place them in a beaker;
[0023] B: Under the protection of vacuum or atmosphere environment, place the beaker on the magnetic mixer, add the clean and dry rotor and mix evenly for 5 minutes at 25°C to obtain a composite powder;
[0024] C: Take the evenly mixed composite powder out.
[0025] The high-performance composite binder prepared by the above steps can be further assembled into a battery, and the method is as follows:
[0026] Mix the positive electrode material LiMn204, composite powder and conductive carbon black according to the ratio of substance amount of 8:1:1 to prepare a positive electrode slurry. Coat the obtained positive electrode slurry evenly on an aluminum foil current collector, and dry the coated aluminum foil in a vacuum drying oven at 80°C for 12 hours to obtain a positive electrode pole piece, after drying, cut the positive electrode pole piece to the required size of the battery; in a glove box filled with argon gas, assemble the positive electrode pole piece, the mixed solvent electrolyte with a 1mol/L of LiPF6+EC/EMC/DMC (the volume ratio is 1:1:1) and the lithium tablet into a CR2016 button battery.
[0027] By blending PVDF with PEO, the amount of PVDF used in battery assembly can be reduced and the appropriate molecular weight can still be maintained. It can be seen from the LiMn204 positive electrode pole piece prepared with PVDF/PEO composite binder in Figure 1 that the low crystallinity of PEO does not affect the crystal structure of LiMn204, and it dissolves well with PVDF in NMP. The addition of PEO does not affect the conductivity of LiMn204.
[0028] The SEM diagram of LiMn204 positive electrode prepared with PVDF binder and PVDF/PEO composite binder is shown in Figure 2. The LiMn204 active material is uniformly coated on the current collector. Since the pole piece is placed in a vacuum drying oven, after drying, the solvent evaporates, so as to cause micropores on the surface of the pole piece. The addition of PEO connects the microstructure of the pole piece, thus increasing the conductivity of the pole piece.
[0029] At room temperature, place the CR2016 button battery on the Neware battery test instrument to test the electrochemical performance of the battery, the results are shown in Figure 3. The charging and discharging current density is set to 0.2C, and the charging and discharging cut-off voltage is 4.3V and 3V respectively. It can be seen from Figure 3 (a), the first discharging specific capacity of LiMn204 battery prepared with PVDF/PEO composite binder is 12mAh/g, while the first discharging specific capacity of LiMn204 battery prepared with PVDF binder is only 93.7mAh/g. The voltage platform gap of the battery with composite binder is small, which indicates that the battery polarization generated during the electrochemical reaction process of the battery is smaller, which is more conducive to the reversible reaction of the battery. It can also be confirmed from Figure 3 (b). After 150 cycles of charging and discharging, the capacity of the composite binder battery is still 88mAh/g, which is higher than 66mAh/g of the ordinary binder battery, and the coulomb efficiency of 99% is higher than 96% of the ordinary binder battery. With the increase of battery cycle times, the bond strength of the binder decreases. The active material of the positive electrode falls off seriously, resulting in a sharp increase in the internal resistance of the battery and a rapid decrease in the cycle specific capacity of the battery. It indicates that PVDF/PEO composite binder can provide better charging and discharging cycle performance for the battery. In Figure 3 (c), the impedance of the ordinary binder battery is significantly greater than that of the composite binder in Figure 3 (d).
[0030] Embodiment 2:
[0031] A preparation method for high-performance composite binder of batteries in the energy storage charging system, which comprises the following steps:
[0032] A: Weigh the powder of PVDF binder and PAA binder according to the ratio of substance amount of 6:4, and place them in a beaker;
[0033] B: Under the protection of vacuum or atmosphere environment, place the beaker on the magnetic mixer, add the clean and dry rotor and mix evenly for 10 minutes at 25°C to obtain a composite powder;
[0034] C: Take the evenly mixed composite powder out.
[0035] The high-performance composite binder prepared by the above steps can be further assembled into a battery, and the method is as follows:
[0036] After taking the evenly mixed composite powder out, mix the positive electrode material LiMn204, composite powder and conductive carbon black according to the ratio of substance amount of 8:1:1 to prepare a positive electrode slurry; coat the obtained positive electrode slurry evenly on an aluminum foil current collector, and dry the coated aluminum foil in a vacuum drying oven at 80°C for 12 hours to obtain a positive electrode pole piece, after drying, cut the positive electrode pole piece to the required size of the battery; in a glove box filled with argon gas, assemble the positive electrode pole piece, the mixed solvent electrolyte with a 1mol/L
of LiPF 6 +EC/EMC/DMC (the volume ratio is 1:1:1) and the lithium tablet into a
CR2016 button battery.
[00371 By blending PVDF and PAA to prepare a button battery, it can be found that its first discharging specific capacity is higher than that of a single PVDF binder. The composite binder can enhance its anti-electrolyte corrosion capability and maintain the mechanical integrity of the electrode during the charging and discharging process of the battery. Therefore, the PVDF/PAA composite binder can improve the charging and discharging cycle performance of the battery.
[0038] Embodiment 3:
[0039] A preparation method for high-performance composite binder of batteries in the energy storage charging system, which comprises the following steps:
[0040] A: Weigh the powder of PVDF binder and PAN binder according to the ratio of substance amount of 9:1, and place them in a beaker;
[0041] B: Under the protection of vacuum or atmosphere environment, place the beaker on the magnetic mixer, add the clean and dry rotor and mix evenly for 5 minutes at 25°C to obtain a composite powder;
[0042] C: Take the evenly mixed composite powder out.
[0043] The high-performance composite binder prepared by the above steps can be further assembled into a battery, and the method is as follows:
[0044] After taking the evenly mixed composite powder out, mix the positive electrode material LiMn204, composite powder and conductive carbon black according to the ratio of substance amount of 8:1:1 to prepare a positive electrode slurry; coat the obtained positive electrode slurry evenly on an aluminum foil current collector, and dry the coated aluminum foil in a vacuum drying oven at 80°C for 12 hours to obtain a positive electrode pole piece, after drying, cut the positive electrode pole piece to the required size of the battery; in a glove box filled with argon gas, assemble the positive electrode pole piece, the mixed solvent electrolyte with a 1mol/L
of LiPF 6 +EC/EMC/DMC (the volume ratio is 1:1:1) and the lithium tablet into a
CR2016 button battery.
[00451 By blending PVDF and PAA to prepare a button battery, it can be found that the composite binder can provide less impedance for the battery, which is conducive to the reversible reaction and reduce the polarization reaction of the battery. Therefore, the PVDF/PAN composite binder can not only improve the coulomb efficiency of the battery, but also improve the electrochemical performance of the battery.
[0046] In summary, the battery with the composite binder prepared by the invention has the following advantages over the battery with the unblended binder:
[0047] (1) Under the same rate, the first discharging specific capacity is increased to 112mAh/g, and the voltage platform gap is smaller;
[0048] (2) Under the same rate, after 150 times of charging and discharging cycles, it can still have a capacity of 88mAh/g, and the coulomb efficiency is maintained at 99%;
[0049] (3) The impedance of the prepared button battery is greatly reduced.
[0050] Obviously, the above descriptions and records are only examples and are not intended to limit the disclosure, application or use of the invention. Although the embodiments have been described in the embodiments and described in the drawings, the invention is not limited to specific examples described in the drawings and the embodiments as the best modes currently considered to implement the teachings of the invention, and the scope of the invention shall include any embodiments falling within the foregoing descriptions and claims. For those ordinary technical personnel in the technical field to which the invention belongs, several simple deductions or replacements can be made without departing from the concept of the invention, and they should be regarded as the protection scope of the invention.
Claims (5)
1. A preparation method for high-performance composite binder of batteries in the energy storage charging system, which is characterized in that, it comprises the following steps: Step A: weigh polyvinylidene fluoride (PVDF) and an aqueous binder according to the ratio of substance amount of 6-9:1-4, and place them in a beaker; Step B: under the protection of vacuum or atmosphere environment, isolate the beaker from moisture in the air, place the beaker on the magnetic mixer, and add the rotor and mix evenly to obtain a composite powder; Step C: take the evenly mixed composite powder out.
2. A preparation method for high-performance composite binder of batteries in the energy storage charging system as described in claim 1, which is characterized in that: The aqueous binder in Step A adopts any one of polyethylene glycol (PEG), polyethylene oxide (PEO), polyacrylic acid (PAA), polyvinyl alcohol (PVA), poly (3,4-ethylenedioxythiophene) (PEDOT), polyacrylamide co-dimethylammonium chloride (AMAC), BPDA, bis-[3-(ethylene oxide ethoxy)-2-hydroxypropyl-] polysulfide (BVPS), polyvinylpyrrolidone (PVP), (butyl acrylate) (PBA), polyamide (PA), polyamide-imide (PAI), polymethylmethacrylate (PMMA), polyacrylonitrile -methyl acrylate (AMMA), poly (tert-Butyl acrylate-triethoxy vinylsilane) (TBATEVS), polyimide (PI), polyetherimide (PEI), polyethylmethacrytate, polyacrylonitrile (PAN), epoxy resin, polyurethane (PU), PTFE, PMA, Nafion, PIB, PS and PVC.
3. A preparation method for high-performance composite binder of batteries in the energy storage charging system as described in claim 1, which is characterized in that: in Step B, the mixing time is 5-10 minutes and the mixing temperature is 25C.
4. A preparation method for high-performance composite binder of batteries in the energy storage charging system as described in claim 1, which is characterized in that: in Step A, the aqueous binder is polyethylene oxide (PEO).
5. A preparation method for high-performance composite binder of batteries in the energy storage charging system as described in claim 1, which is characterized in that: in Step A, the aqueous binder is polyacrylic acid (PAA).
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| Application Number | Priority Date | Filing Date | Title |
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| AU2021105810A AU2021105810A4 (en) | 2021-08-18 | 2021-08-18 | A Preparation Method for High-performance Composite Binder of Batteries in the Energy Storage Charging System |
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| Application Number | Priority Date | Filing Date | Title |
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| AU2021105810A AU2021105810A4 (en) | 2021-08-18 | 2021-08-18 | A Preparation Method for High-performance Composite Binder of Batteries in the Energy Storage Charging System |
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| Publication Number | Publication Date |
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| AU2021105810A4 true AU2021105810A4 (en) | 2021-10-21 |
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