CN103811810A - Modified polyvinylidene fluoride vinyl gel polymer electrolyte as well as preparation method thereof - Google Patents
Modified polyvinylidene fluoride vinyl gel polymer electrolyte as well as preparation method thereof Download PDFInfo
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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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Abstract
The invention provides a modified polyvinylidene fluoride vinyl gel polymer electrolyte as well as a preparation method thereof. The preparation method comprises the following steps: preparing to obtain an MCM-48 mesoporous molecular sieve, mixing and stirring polyvinylidene fluoride, an organic solvent and the MCM-48 mesoporous molecular sieve uniformly, warming to 30-50 DEG C, stirring for 30-100 minutes so as to obtain slurry, pouring the slurry on a base plate, drying so as to obtain a polyvinylidene fluoride microporous film, and immersing the polyvinylidene fluoride microporous film in electrolyte for 5-60 minutes under an inert condition. The modified polyvinylidene fluoride vinyl gel polymer electrolyte which is modified by the MCM-48 mesoporous molecular sieve has favorable conductivity and mechanical intensity, is good in safety, and is environment-friendly, and the preparation method is simple in technological process.
Description
Technical field
The present invention relates to electrochemical field, relate in particular to a kind of modified polyvinylidene fluoride-based gel polymer dielectric and preparation method thereof.
Background technology
Along with the development of various new forms of energy, the miniaturization development of portable electric appts and the widespread demand of electric automobile to large-capacity high-power chemical power source.A kind of research and development of the novel battery material with high-rate charge-discharge capability become of crucial importance.But safety problem is the bottleneck of the large capacity of restriction, high power lithium ion cell application always.Wherein, the problem such as burning, blast that leakage, electrolyte oxidation decomposition and the thermal runaway etc. that now widely used liquid electrolyte produces cause is the main potential safety hazard of battery.
The advantage of the liquid electrolyte of current routine is that conductivity is high, but inflammable owing to containing, volatile organic solvent, it discharges fuel gas in charge and discharge process, particularly under some unconventional condition of work, (discharge and recharge as high-power, super-charge super-discharge etc.) produces large calorimetric meeting and accelerates the generation of gas, cause inner pressure of battery to increase, Leakage Gas, blast even on fire, thereby there is serious potential safety hazard.The studied persons of advantage such as polymer electrolyte lithium-ion battery is safe because having, nothing is leaked, leakage current is little pay attention to.Because conductivity under solid polymer electrolyte room temperature is lower by (10
-5~ 10
-4s/cm), use application to be restricted, thereby gel polymer electrolyte become research emphasis.
Gel polymer electrolyte is made up of polymer, small molecule solvent (plasticizer) and inorganic salts etc., conventionally turned into forming by chemical crosslinking isogel between Van der Waals force and polymer, there is the processing characteristics that polymer is good, and contain liquid electrolyte, and there is high conductivity at room temperature, can serve as barrier film, replace liquid electrolyte, and because polymer has thermoplasticity, plastic, make gel polymer electrolyte there is good application prospect in the field such as lithium ion battery, capacitor.But due to the existence of small-molecule substance, make gel polymer electrolyte have the shortcomings such as chemistry, electrochemical stability and thermal stability are poor, and mechanical property is lower.
Summary of the invention
Given this, the present invention aims to provide a kind of modified polyvinylidene fluoride-based gel polymer dielectric and preparation method thereof.Described modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte is to carry out modification with mesopore molecular sieve, and Kynoar (PVDF) the base gel polymer electrolyte after modification possesses higher conductivity, and fail safe is good, environmental friendliness.Preparation method's technological process provided by the invention is simple.
First aspect, the invention provides a kind of modified polyvinilidene fluoride (PVDF) base method for preparing gel polymer electrolyte, comprises the following steps:
(1) prepare MCM-48 mesopore molecular sieve:
By CTAB (CTAB), after deionized water and NaOH mixed dissolution, be warming up to 20 ~ 50 ℃, constant temperature stirs 30 ~ 120min, add tetraethoxysilane, continue to stir 4 ~ 5h, obtain mixture, wherein, described CTAB (CTAB): deionized water: NaOH: the amount ratio of tetraethoxysilane is (0.55 ~ 0.7) g:(65 ~ 80) ml:(0.4 ~ 0.5) g:1g, mixture is moved in closed reactor, static crystallization 3 ~ 12h at 80 ~ 120 ℃, be dried after filtration with after washing, obtain presoma, presoma is warming up to 500 ~ 600 ℃, constant temperature calcining 4 ~ 10h, obtain MCM-48 mesopore molecular sieve.
(2) prepare Kynoar (PVDF) microporous barrier:
After MCM-48 mesopore molecular sieve mixing and stirring prepared by Kynoar (PVDF), organic solvent and step (1), be warming up to 30 ~ 50 ℃, stir 30 ~ 100min, obtain slurry, wherein, the amount ratio of described Kynoar (PVDF), described organic solvent and described MCM-48 mesopore molecular sieve is 10g:(30 ~ 150) ml:(0.5 ~ 3) g, described slurry is cast on substrate, after vacuumize, obtains Kynoar (PVDF) microporous barrier.
(3) in the glove box that is full of inert gas, the Kynoar of step (2) (PVDF) microporous barrier is dipped in to 5 ~ 60min in electrolyte, obtain modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte.
Step of the present invention (1) is prepared the process of MCM-48 mesopore molecular sieve for template for CTAB (CTAB), prepare the process that model is the molecular sieve of MCM-48, wherein, CTAB (CTAB) plays stay in place form and directed agents, be removed in the process that presoma is placed in to high-temperature roasting, thereby open the duct of molecular sieve, make the molecular sieve obtaining there is a large amount of holes and high specific area.
Preferably, the programming rate that is warming up to 500 ~ 600 ℃ described in is 3 ~ 5 ℃/min.
Preferably, described being dried is at 70 ~ 90 ℃ of dry 12 ~ 48h.
Step of the present invention (2) obtains after slurry through cast and dry for Kynoar (PVDF), organic solvent and MCM-48 mesopore molecular sieve are mixed according to a certain ratio, the process that obtains Kynoar (PVDF) microporous barrier of compound MCM-48 mesopore molecular sieve, in this preparation process, the effect of organic solvent is as plasticizer.
Preferably, the weight average molecular weight of described Kynoar (PVDF) is 10 ~ 500,000.Kynoar (PVDF) has good mechanical strength, and thermal stability and chemical stability can improve mechanical performance and the stability of prepared gel electrolyte as the base material of gel polymer electrolyte.
Preferably, described organic solvent is 1-METHYLPYRROLIDONE (NMP) or DMF (DMF).
Preferably, described inert gas is nitrogen or argon gas.
Preferably, described vacuumize is vacuumize 24 ~ 48h at 60 ~ 100 ℃.
Preferably, pressure when described vacuumize is 0.01MPa.Vacuum degree in dry run is more high better, in Kynoar (PVDF) microporous membrane structure obtaining after dry, due to adding of mesopore molecular sieve, make Kynoar (PVDF) microporous barrier there is good pore space structure, not only there is a large amount of micropores on surface, and also have many interconnective micropores in lower face, be beneficial to and improve electrolytical conductivity.
Preferably, the thickness of described Kynoar (PVDF) microporous barrier is 30 ~ 50 μ m.
Preferably, substrate is glass plate or polyfluortetraethylene plate.
Step (3) is to be prepared the process of modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte by Kynoar (PVDF) microporous barrier of compound MCM-48 mesopore molecular sieve.MCM-48 mesopore molecular sieve is the mesopore molecular sieve of Emission in Cubic, there is comparatively homogeneous aperture and good long-range order, its three-dimensional open-framework has good transmission performance, meet minimal face helical structure, be difficult for causing absorption molecule moving disorder, MCM-48 mesopore molecular sieve is added, be beneficial to the conductivity and the mechanical stability that improve Kynoar (PVDF) base gel polymer electrolyte.
Preferably, described electrolyte is by lithium hexafluoro phosphate (LiPF
6), ethylene carbonate (EC) and propene carbonate (PC) composition.Electrolyte is contained in the glove box that is full of inert gas.
Preferably, described ethylene carbonate (EC): the volume ratio of propene carbonate (PC) is 1:1 ~ 1:5.
Preferably, described lithium hexafluoro phosphate (LiPF
6) molar concentration be 0.5 ~ 1.5mol/L.
Preferably, inert gas is nitrogen or argon gas.
Second aspect, the invention provides a kind of modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte, and this electrolyte is prepared by said method.
The invention provides a kind of modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte and preparation method thereof, there is following beneficial effect:
(1) because MCM-48 mesopore molecular sieve has higher specific area and abundant hole, and Kynoar (PVDF) is mechanical strength and the base material that has good stability, Kynoar (PVDF) base gel polymer electrolyte after the modification of MCM-48 mesopore molecular sieve provided by the invention possesses higher conductivity, security performance is high, has good power density, life-span and specific capacity;
(2) Kynoar provided by the invention (PVDF) base method for preparing gel polymer electrolyte is simple and quick, possesses low cost, and the feature such as environmental friendliness;
(3) Kynoar provided by the invention (PVDF) base gel polymer electrolyte can be used as the solid electrolyte of lithium ion battery.
Embodiment
The following stated is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Embodiment mono-
Modified polyvinilidene fluoride (PVDF) base method for preparing gel polymer electrolyte, comprises the following steps:
(1) prepare MCM-48 mesopore molecular sieve:
Take 0.6g CTAB (CTAB), be dissolved in 65mL deionized water, then add 0.47g NaOH, be warming up to constant temperature stirring 60min at 30 ℃ and make its dissolving, slowly add 1.0g tetraethoxysilane, continue to stir 4h, obtain mixture, gained mixture is moved in the closed reactor of teflon gasket, in baking oven in 100 ℃ of static crystallization 6h, filter, after washing, at 80 ℃, dry 36h obtains presoma, presoma is placed in to Muffle furnace, be warming up to 550 ℃ with the programming rate of 5 ℃/min, roasting 8h, remove template, obtain MCM-48 mesopore molecular sieve.
(2) prepare Kynoar (PVDF) microporous barrier of compound MCM-48 mesopore molecular sieve:
10g Kynoar (PVDF) (weight average molecular weight is 300,000) is dissolved in to 60mL 1-METHYLPYRROLIDONE (NMP), stir, the MCM-48 mesopore molecular sieve that adds 1.0g step (1) to prepare, be warmed up to 40 ℃ and stir 60min, mix, obtain slurry, slurry is evenly cast on clean glass plate, dry 36h under the vacuum condition of 80 ℃ and 0.01MPa, obtains Kynoar (PVDF) microporous barrier of compound MCM-48, and thickness is 45 μ m.
(3) Kynoar (PVDF) microporous barrier of being prepared by step (2) is put into and is immersed electrolyte 30min, and electrolyte is by LiPF
6, EC and PC composition, the volume ratio of EC:PC is 1:1, LiPF
6molar concentration be 1mol/L, electrolyte is contained in the glove box that is full of argon gas, takes out and obtain modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte.
Embodiment bis-
Modified polyvinilidene fluoride (PVDF) base method for preparing gel polymer electrolyte, comprises the following steps:
(1) prepare MCM-48 mesopore molecular sieve:
Take 0.65g CTAB (CTAB), be dissolved in 75mL deionized water, then add 0.5g NaOH, be warming up to constant temperature stirring 30min at 20 ℃ and make its dissolving, slowly add 1.0g tetraethoxysilane, continue to stir 5h, obtain mixture, gained mixture is moved in the closed reactor of teflon gasket, in baking oven in 120 ℃ of static crystallization 3h, filter, after washing, at 70 ℃, dry 48h obtains presoma, presoma is placed in to Muffle furnace, be warming up to 500 ℃ with the programming rate of 3 ℃/min, roasting 10h, remove template, obtain MCM-48 mesopore molecular sieve.
(2) prepare Kynoar (PVDF) microporous barrier of compound MCM-48 mesopore molecular sieve:
10g Kynoar (PVDF) (weight average molecular weight is 100,000) is dissolved in to 30mL 1-METHYLPYRROLIDONE (NMP), stir, the MCM-48 mesopore molecular sieve that adds 0.5g step (1) to prepare, be warmed up to 30 ℃ and stir 100min, mix, obtain slurry, slurry is evenly cast on clean glass plate, dry 48h under the vacuum condition of 60 ℃ and 0.01MPa, obtains Kynoar (PVDF) microporous barrier of compound MCM-48, and thickness is 35 μ m.
(3) Kynoar (PVDF) microporous barrier of being prepared by step (2) is put into and is immersed electrolyte 5min, and electrolyte is by LiPF
6, EC and PC composition, the volume ratio of EC:PC is 1:3, LiPF
6molar concentration be 1.5mol/L, electrolyte is contained in the glove box that is full of argon gas, takes out and obtain modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte.
Embodiment tri-
Modified polyvinilidene fluoride (PVDF) base method for preparing gel polymer electrolyte, comprises the following steps:
(1) prepare MCM-48 mesopore molecular sieve:
Take 0.55g CTAB (CTAB), be dissolved in 65mL deionized water, then add 0.4g NaOH, be warming up to constant temperature stirring 120min at 50 ℃ and make its dissolving, slowly add 1.0g tetraethoxysilane, continue to stir 4h, obtain mixture, gained mixture is moved in the closed reactor of teflon gasket, in baking oven in 80 ℃ of static crystallization 12h, filter, after washing, at 90 ℃, dry 12h obtains presoma, presoma is placed in to Muffle furnace, be warming up to 600 ℃ with the programming rate of 4 ℃/min, roasting 4h, remove template, obtain MCM-48 mesopore molecular sieve.
(2) prepare Kynoar (PVDF) microporous barrier of compound MCM-48 mesopore molecular sieve:
10g Kynoar (PVDF) (weight average molecular weight is 500,000) is dissolved in to 150mL N, dinethylformamide (DMF), stir, the MCM-48 mesopore molecular sieve that adds 3.0g step (1) to prepare, is warmed up to 30 ℃ and stirs 70min, mix, obtain slurry, slurry is evenly cast on clean glass plate, dry 40h under the vacuum condition of 75 ℃ and 0.01MPa, Kynoar (PVDF) microporous barrier that obtains compound MCM-48, thickness is 50 μ m.
(3) Kynoar (PVDF) microporous barrier of being prepared by step (2) is put into and is immersed electrolyte 60min, and electrolyte is by LiPF
6, EC and PC composition, the volume ratio of EC:PC is 1:5, LiPF
6molar concentration be 0.5mol/L, electrolyte is contained in the glove box that is full of argon gas, takes out and obtain modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte.
Embodiment tetra-
Modified polyvinilidene fluoride (PVDF) base method for preparing gel polymer electrolyte, comprises the following steps:
(1) prepare MCM-48 mesopore molecular sieve:
Take 0.7g CTAB (CTAB), be dissolved in 80mL deionized water, then add 0.5g NaOH, be warming up to constant temperature stirring 85min at 50 ℃ and make its dissolving, slowly add 1.0g tetraethoxysilane, continue to stir 4.5h, obtain mixture, gained mixture is moved in the closed reactor of teflon gasket, in baking oven in 110 ℃ of static crystallization 7h, filter, after washing, at 80 ℃, dry 30h obtains presoma, presoma is placed in to Muffle furnace, be warming up to 550 ℃ with the programming rate of 5 ℃/min, roasting 8h, remove template, obtain MCM-48 mesopore molecular sieve.
(2) prepare Kynoar (PVDF) microporous barrier of compound MCM-48 mesopore molecular sieve:
10g Kynoar (PVDF) (weight average molecular weight is 400,000) is dissolved in to 120mL N, dinethylformamide (DMF), stir, the MCM-48 mesopore molecular sieve that adds 3.0g step (1) to prepare, is warmed up to 50 ℃ and stirs 30min, mix, obtain slurry, slurry is evenly cast on clean glass plate, dry 24h under the vacuum condition of 100 ℃ and 0.01MPa, Kynoar (PVDF) microporous barrier that obtains compound MCM-48, thickness is 30 μ m.
(3) Kynoar (PVDF) microporous barrier of being prepared by step (2) is put into and is immersed electrolyte 40min, and electrolyte is by LiPF
6, EC and PC composition, the volume ratio of EC:PC is 1:1, LiPF
6molar concentration be 1.2mol/L, electrolyte is contained in the glove box that is full of argon gas, takes out and obtain modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte.
Comparative example
For unmodified Kynoar (PVDF) the base method for preparing gel polymer electrolyte contrasting, comprise the following steps:
(1) 10g Kynoar (PVDF) (weight average molecular weight is 300,000) is dissolved in to 80mL 1-METHYLPYRROLIDONE (NMP), 1-METHYLPYRROLIDONE (NMP) is as plasticizer, being warmed up to 40 ℃ is uniformly mixed, obtain slurry, slurry is cast on clean glass plate equably, be placed under the vacuum condition of 80 ℃ and 0.01MPa after dry 36h, obtain Kynoar (PVDF) gel mould, thickness is 45 μ m.
(2) Kynoar (PVDF) gel mould of being prepared by step (1) immerses 30min in electrolyte, and electrolyte is by LiPF
6, EC and PC composition, the volume ratio of EC:PC is 1:2, LiPF
6molar concentration be 1mol/L, electrolyte is contained in the glove box that is full of argon gas, takes out and obtain unmodified Kynoar (PVDF) base gel polymer electrolyte.
Test implementation example
For the application performance of modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte prepared by the present invention is described, provide following method of testing and data:
(1) conductivity test: add the electrolyte preparing between two stainless steel blocking electrodes, form polymer dielectric blocking electrode system, do ac impedance measurement, obtain the complex impedance plane graph of GPE, curve is body impedance in the intersection value of high frequency region and transverse axis.According to body impedance (R
b) and ionic conductivity (σ) between relation:
σ=d/(S×R
b)
Can calculate ionic conductivity, thickness, S that wherein d is polymer dielectric are the contact area of polymer dielectric electrolyte and electrode.
The conductivity data of test implementation example one ~ tetra-modified polyvinilidene fluoride (PVDF) the base gel polymer electrolyte of preparation and comparative example's unmodified Kynoar (PVDF) base gel polymer electrolyte is in table 1 as stated above.
The conductivity data table of table 1 Kynoar (PVDF) base gel polymer electrolyte
| Sample | Embodiment mono- | Embodiment bis- | Embodiment tri- | Embodiment tetra- | Comparative example |
| Conductivity (ms/cm) | 2.8 | 2.5 | 3.2 | 2.2 | 0.8 |
From table 1 data, the present invention adopts the conductivity of modified polyvinilidene fluoride (PVDF) base gel polymer electrolyte prepared by the modification of MCM-48 mesopore molecular sieve to be significantly higher than unmodified Kynoar (PVDF) base gel polymer electrolyte.
(2) charge-discharge test:
Unmodified Kynoar (PVDF) base gel polymer electrolyte prepared by the modified polyvinilidene fluoride making (PVDF) base gel polymer electrolyte and comparative example is assembled into lithium ion battery, is operating as: take 9g LiCoO
2, 0.5g graphite agent KS-6 and 0.5g Kynoar (PVDF, product type is FR905), and add 70g 1-METHYLPYRROLIDONE (NMP), fully stir and make it to become the slurry mixing.Then by slurry blade coating on the aluminium foil cleaning through ethanol, under 0.01MPa, be dried to constant weight in 100 ℃, and be pressed into LiCoO in 12MPa pressure lower roll
2electrode, and be cut into anodal disk.Take anodal disk as anodal, lithium sheet is as negative pole, use respectively Kynoar (PVDF) the base gel polymer electrolyte of embodiment mono-~ tetra-preparation and comparative example's unmodified Kynoar (PVDF) base gel polymer electrolyte to be placed between both positive and negative polarity as solid electrolyte, on stamping machine, button cell is made in sealing, obtains lithium ion battery.
In the voltage range of 2.5 ~ 4.2V, utilize charge-discharge test instrument to carry out 0.1C charge-discharge test to the above-mentioned lithium ion battery assembling, obtain specific discharge capacity and the discharging efficiency of 3th, data are in table 2.
The charge-discharge test tables of data of table 2 Kynoar (PVDF) base gel polymer electrolyte
As shown in Table 2, assemble the specific discharge capacity of 3th of the lithium ion battery obtaining as solid electrolyte take Kynoar (PVDF) the base gel polymer electrolyte of the embodiment of the present invention one ~ tetra-preparation as 112～120mAh/g, discharging efficiency is 93% ~ 96%, use comparative example's unmodified Kynoar (PVDF) base gel polymer electrolyte to assemble the lithium ion battery obtaining and be significantly improved, illustrate that the present invention utilizes mesopore molecular sieve modification to make discharging and recharging of Kynoar (PVDF) base gel polymer electrolyte and the equal performance of efficiency is improved.
To sum up, because MCM-48 mesopore molecular sieve has higher specific area and abundant pore space structure, the present invention prepares Kynoar (PVDF) base gel polymer electrolyte by the modification of MCM-48 mesopore molecular sieve, and the conductivity of Kynoar (PVDF) the base gel polymer electrolyte after modification and application performance and the security performance of battery prepared therefrom are improved.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (9)
1. a modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes, is characterized in that, comprises the following steps:
(1) prepare MCM-48 mesopore molecular sieve:
To after CTAB, deionized water and NaOH mixed dissolution, be warming up to 20 ~ 50 ℃, constant temperature stirs 30 ~ 120min, adds tetraethoxysilane, continues to stir 4 ~ 5h, obtain mixture, mixture is moved in closed reactor, and static crystallization 3 ~ 12h at 80 ~ 120 ℃, is dried after filtration with after washing, obtain presoma, presoma is warming up to 500 ~ 600 ℃, and constant temperature calcining 4 ~ 10h, obtains MCM-48 mesopore molecular sieve; Wherein, described CTAB: deionized water: NaOH: the amount ratio of tetraethoxysilane is (0.55 ~ 0.7) g:(65 ~ 80) ml:(0.4 ~ 0.5) g:1g;
(2) prepare polyvinylidene fluoride microporous film:
After MCM-48 mesopore molecular sieve mixing and stirring prepared by Kynoar, organic solvent and step (1), be warming up to 30 ~ 50 ℃, stir 30 ~ 100min, obtain slurry, described slurry is cast on substrate, after vacuumize, obtain polyvinylidene fluoride microporous film; Wherein, the amount ratio of described Kynoar, described organic solvent and described MCM-48 mesopore molecular sieve is 10g:(30 ~ 150) ml:(0.5 ~ 3) g;
(3) in the glove box that is full of inert gas, the polyvinylidene fluoride microporous film of step (2) is dipped in to 5 ~ 60min in electrolyte, obtain modified polyvinylidene fluoride-based gel polymer dielectric.
2. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, is characterized in that, in step (1), described in to be warming up to the programming rate of 500 ~ 600 ℃ be 3 ~ 5 ℃/min.
3. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, is characterized in that, in step (1), described being dried is at 70 ~ 90 ℃ of dry 12 ~ 48h.
4. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, is characterized in that, in step (2), the weight average molecular weight of described Kynoar is 10 ~ 500,000.
5. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, is characterized in that, in step (2), the thickness of described polyvinylidene fluoride microporous film is 30 ~ 50 μ m.
6. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, is characterized in that, in step (2), described organic solvent is 1-METHYLPYRROLIDONE or DMF.
7. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, is characterized in that, in step (2), described vacuumize is vacuumize 24 ~ 48h at 60 ~ 100 ℃.
8. modified polyvinylidene fluoride-based gel method for preparing polymer electrolytes as claimed in claim 1, it is characterized in that, in step (2), described electrolyte is made up of lithium hexafluoro phosphate, ethylene carbonate and propene carbonate, described ethylene carbonate: the volume ratio of propene carbonate is 1:1 ~ 1:5, the molar concentration of described lithium hexafluoro phosphate is 0.5 ~ 1.5mol/L.
9. a modified polyvinylidene fluoride-based gel polymer dielectric, is characterized in that, is the modified polyvinylidene fluoride-based gel polymer dielectric that method prepares as claimed in claim 1.
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| CN114530630A (en) * | 2022-02-17 | 2022-05-24 | 中国科学院物理研究所 | Low-solvent polymer electrolyte, preparation method thereof, electrode and solid-state battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114530630A (en) * | 2022-02-17 | 2022-05-24 | 中国科学院物理研究所 | Low-solvent polymer electrolyte, preparation method thereof, electrode and solid-state battery |
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