CN112329310A - TiO 22Dimension pair TiO2Modeling and simulation method for influence of dielectric property of PVDF composite material - Google Patents
TiO 22Dimension pair TiO2Modeling and simulation method for influence of dielectric property of PVDF composite material Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 116
- 239000002033 PVDF binder Substances 0.000 title claims abstract description 111
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 90
- 238000004088 simulation Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 29
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 99
- 230000005684 electric field Effects 0.000 claims abstract description 96
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 82
- 238000009826 distribution Methods 0.000 claims abstract description 50
- 239000002114 nanocomposite Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 22
- 230000005686 electrostatic field Effects 0.000 claims description 3
- 239000000945 filler Substances 0.000 abstract description 42
- 230000015556 catabolic process Effects 0.000 abstract description 22
- 238000004146 energy storage Methods 0.000 abstract description 9
- 230000007246 mechanism Effects 0.000 abstract description 8
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- 238000009827 uniform distribution Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 239000002070 nanowire Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- -1 poly(vinylidene fluoride) Polymers 0.000 description 2
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- 239000011247 coating layer Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
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Abstract
TiO 22Dimension pair TiO2A modeling and simulation method for dielectric property influence of PVDF composite material belongs to the technical field of composite material dielectric property research and is used for solving the problem that TiO can not be intuitively reflected in the prior art2The internal microscopic property distribution of the PVDF composite material cannot be better analyzed and determined2Influence of filler appearance on the dielectric properties of the composite material. The invention adopts a finite element method to treat TiO2The structure and the performance of a PVDF composite material system are simulated and simulated, a two-dimensional model and a three-dimensional model are established, the breakdown mechanism of the composite material is systematically researched from the aspects of electric field intensity, leakage current density and system energy density distribution, the influence of the filler morphology on the dielectric performance of the composite material is further researched, and the simulation result shows that the one-dimensional TiO composite material is subjected to simulation and simulation2The PVDF composite material has stronger breakdown resistance. One aspect of the method of the invention is used inThe mechanism of improving the dielectric property of the composite material is researched systematically, and on the other hand, the development of the composite material with high energy storage density can be guided, so that the research and development cost is reduced, and the research and development period is shortened.
Description
Technical Field
The invention relates to the technical field of research on dielectric properties of composite materials, in particular to TiO2Dimension pair TiO2A modeling and simulation method for dielectric property influence of a PVDF composite material.
Technical Field
With the rapid development of the electronic industry, people have increasingly growing demand for electrical energy storage devices, wherein energy storage capacitors are receiving more and more attention by virtue of the advantages of fast charging and discharging and high energy storage density. In the field of small-scale energy storage, particularly in the field of microelectronics, dielectric capacitors still dominate the market due to the advantages of instantaneous response characteristics, high power density and permission to operate at high frequency (GHz).
In recent years, some researches show that the appearance of the filler can obviously improve the dielectric property of the composite material. Although these studies have made some new progress, failing to systematically study the mechanism of dielectric property enhancement is difficult to provide theoretical guidance for the subsequent traditional experimental study. Therefore, the analog computation of the composite material is gradually emphasized, and the current analog computation of the composite material is mainly divided into a phase field method and a finite element method.
Document [1 ]]The influence of the filler morphology on the dielectric property of the composite material is researched in a two-dimensional model by adopting a phase field method, and the mechanism of improving the dielectric property of the material by the self dielectric constant and the arrangement mode of the spherical filler is researched, but the filler morphology research cannot effectively simulate the filler with complex morphology due to the limitation of the two-dimensional model; document [2 ]]The electric field intensity distribution of the composite material is simulated by adopting a finite element method, and the electric field distribution of the composite material with or without a coating layer is compared to show that the Al is coated on the filler2O3The layer can effectively reduce the size of a high electric field area in the composite material; through analog simulation calculation, on one hand, the dielectric property promotion mechanism of the material can be researched, on the other hand, the composite material with high energy storage density can be guided to be developed, the research and development cost is reduced, and the research and development period is shortened. Although the above studies have made some new progress, the mechanism of improving the dielectric properties of the composite material has not been studied systematically.
Disclosure of Invention
In view of the above problems, the present invention provides a TiO compound2Dimension pair TiO2A modeling and simulation method for dielectric property influence of PVDF composite material is used for solving the problem that TiO can not be intuitively reflected in the prior art2The internal microscopic property distribution of the PVDF composite material cannot be better analyzed and determined2Filler phaseThe appearance of the composite material has influence on the dielectric property of the composite material.
step one, respectively establishing TiO with different dimensions by adopting a finite element method2Of TiO 22A PVDF nanocomposite system model;
step two, for TiO with different dimensions2Of TiO 22Performing analog simulation on the dielectric property of the PVDF nano composite material; the dielectric properties include electric field strength, leakage current density, and energy density;
acquiring an analog simulation result, wherein the analog simulation result comprises electric field intensity distribution, leakage current density distribution and energy density distribution;
step four, carrying out numerical analysis according to the simulation result to obtain TiO with different dimensions2To TiO 22Conclusion of the influence of the dielectric properties of the PVDF nanocomposite.
Further, modeling and simulation are performed by using a COMSOL5.4 simulation platform.
Further, the different dimensions in step one include zero dimension and one dimension.
Further, the composite system model in the first step includes a three-dimensional model and a two-dimensional model.
Further, the composite material system model adopts a current conservation model in an electrostatic field module of a COMSOL5.4 simulation platform, namely TiO2And PVDF with dielectric constants of 48 and 8.26, respectively, and a conductivity of 10, respectively-10S/m and 10-15S/m，TiO2The volume fraction of doping was 5%.
Further, the three-dimensional model size is 100nm × 100nm × 100 nm.
Further, TiO with different dimensions in the fourth step2To TiO 22The conclusion of the influence of the dielectric property of the PVDF nano composite material is as follows: compared with zero-dimensional, one-dimensional TiO2PVDF is able to significantly improve and homogenize local electric fields, leakage current density and energy density.
The beneficial technical effects of the invention are as follows: using finite element method to treat TiO2The structure and the performance of a PVDF composite material system are simulated and simulated, a two-dimensional model and a three-dimensional model are established, the breakdown mechanism of the composite material is systematically researched from the aspects of electric field intensity, leakage current density and system energy density distribution, and the influence of the filler morphology on the dielectric performance of the composite material is further researched. Research results show that the zero-dimensional TiO is compared under the condition of 5 vol% doping2PVDF composite, one-dimensional TiO2The electric field intensity, the leakage current density and the system energy density of the PVDF composite material are distributed more uniformly, the distortion is smaller, the areas with high electric field intensity, leakage current density and energy density are obviously reduced, and the simulation result shows that the one-dimensional TiO composite material has the advantages of uniform distribution, small distortion, high electric field intensity, small leakage current density and small energy density, and the one-2The PVDF composite material has stronger breakdown resistance.
Drawings
The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used throughout the figures to indicate like or similar parts. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to further explain the principles and advantages of the invention.
FIG. 1 shows a TiO compound2Dimension pair TiO2A schematic flow chart of a modeling and simulation method for the influence of dielectric property of the PVDF composite material;
FIG. 2 shows TiO2A schematic diagram of a PVDF nanocomposite three-dimensional model;
FIG. 3 shows zero-dimensional and one-dimensional TiO data in the simulation result of the three-dimensional model2PVDF surface electric field intensity distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 4 shows zero-dimensional and one-dimensional TiO data in the simulation result of the three-dimensional model2PVDF surface leakage current density distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 5 shows zero-dimensional and one-dimensional TiO data in the simulation result of the three-dimensional model2PVDF surface energy DensityA distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 6 shows zero-dimensional and one-dimensional TiO data in the simulation result of the two-dimensional model2PVDF internal electric field intensity distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 7 shows post-processed zero-dimensional and one-dimensional TiO in two-dimensional model simulation results2PVDF internal electric field intensity distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 8 shows zero-dimensional and one-dimensional TiO data in the simulation results of two-dimensional model2PVDF internal leakage current density distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 9 shows post-processed zero-dimensional and one-dimensional TiO in two-dimensional model simulation results2PVDF internal leakage current density distribution diagram; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 10 shows zero-dimensional and one-dimensional TiO data in the simulation results of two-dimensional model2PVDF internal energy density profile; wherein, diagram (a) represents the zero dimension; FIG. (b) represents one dimension;
FIG. 11 shows post-processed zero-dimensional and one-dimensional TiO in two-dimensional model simulation results2PVDF internal energy density profile; wherein, diagram (a) represents the zero dimension; the graph (b) shows one dimension.
Detailed Description
Exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure. It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
FIG. 1 shows a TiO compound2Dimension pair TiO2Schematic flow diagram of a method for modeling and simulating the dielectric properties of a/PVDF composite, as shown in fig. 1, comprising the steps of:
step one, respectively establishing TiO with different dimensions by adopting a finite element method2Of TiO 22PVDF nanocomposite models; wherein the different dimensions include zero dimension and one dimension; the model comprises a three-dimensional model and a two-dimensional model, wherein the model adopts a current conservation model in an electrostatic field module of a COMSOL5.4 simulation platform, TiO2And PVDF with dielectric constants of 48 and 8.26, respectively, and a conductivity of 10, respectively-10S/m and 10-15S/m，TiO2The volume fraction of doping is 5%, and the three-dimensional model size is 100nm multiplied by 100 nm;
step two, for TiO with different dimensions2Of TiO 22Performing analog simulation on the dielectric property of the PVDF nano composite material; the dielectric properties include electric field strength, leakage current density, and energy density;
acquiring an analog simulation result, wherein the analog simulation result comprises electric field intensity distribution, leakage current density distribution and energy density distribution;
step four, carrying out numerical analysis according to the simulation result to obtain TiO with different dimensions2To TiO 22The conclusion of the influence of the dielectric property of the PVDF nano composite material is drawn; the conclusion is that: compared with zero-dimensional, one-dimensional TiO2PVDF is able to significantly improve and homogenize local electric fields, leakage current density and energy density.
Further, modeling and simulation are performed by using a COMSOL5.4 simulation platform.
Detailed description of the preferred embodiment
TiO of different dimensions2Modeling and imitation of PVDF nano composite material three-dimensional modelTrue:
1) to study TiO2Dimension pair TiO2Effect of PVDF nanocomposite dielectric Properties by use of COMSOL on zero and one-dimensional TiO respectively2The electric field of the doped nanocomposite was simulated.
TiO2The three-dimensional model of the/PVDF nano composite material is shown in figure 2, the size of the model is 100nm multiplied by 100nm, a sphere represents an internal filler, and the rest space represents a matrix. In the simulation, a terminal 1000V is added on the upper polar plate, the lower polar plate is grounded, and the other polar plates are electrically insulated. Using a current conservation model, zero-dimensional TiO2One-dimensional TiO 22PVDF dielectric constants 48, 48 and 8.26, respectively, and conductivities 10, respectively-10S/m、10-10S/m、10-15S/m, wherein the TiO is spherical2Diameter 25 nm, TiO2Nanowire aspect ratio 1:5, TiO2The volume fraction of doping is unified to 5%.
For linear materials, the key to improving the energy storage capacity is to improve the dielectric constant and breakdown resistance of the material. The general strategy is to combine the high breakdown strength of the polymer material with the high dielectric constant of the inorganic filler, and to control the doping content, so that the composite material can obtain high dielectric and improve the breakdown resistance, thereby improving the energy storage density of the composite material.
The difference in dielectric constant between the filler and the polymer matrix can lead to a redistribution of the electric field in the nanocomposite. In order to research the mechanism of filler dimension on improving the breakdown resistance of the composite material, zero-dimensional TiO and one-dimensional TiO are respectively treated2The PVDF composite material was subjected to finite element simulation and the electric field distribution is shown in FIG. 3.
From the electric field distribution in FIG. 3, TiO with different dimensions2The filler is added, so that the electric field distribution on the surface of the material is distorted, distortion is generated, and the high electric field area is in sharp contrast with the adjacent low electric field area.
With zero-dimensional TiO2In contrast, one-dimensional TiO2The effect of the homogenized electric field is more obvious, the strength of the high electric field area on the surface is reduced, and the high electric field area is less and has a smaller range. From the simulation numerical point of viewOn-line TiO2The maximum electric field intensity of the PVDF composite material surface is 0.0326849V/m, compared with that of the spherical TiO2The maximum electric field intensity of the PVDF composite material is reduced by about 1.42 times (0.0463407V/m vs 0.0326849V/m). The zero-dimensional TiO of the invention2Refers to spherical TiO2One-dimensional TiO2Is a linear TiO2。
2) The superposition of high electric fields often causes the increase of leakage current density, respectively for zero-dimensional and one-dimensional TiO2The leakage current density distribution of the PVDF/PVDF composite material is shown in FIG. 4.
From the leakage current distribution in FIG. 4, TiO with different dimensions2The addition of the filler changes the leakage current distribution on the surface of the material, generates distortion, and the high leakage current area is in sharp contrast with the adjacent low leakage current area.
With spherical TiO2In contrast, linear TiO2The effect of homogenizing the leakage current density is more obvious, the high leakage current density area on the surface of the composite material is obviously reduced and has a smaller range, and the simulation numerical value shows that the uniform distribution of the leakage current density on the surface of the composite material is in one-dimensional TiO2The maximum leakage current density of the surface of the PVDF composite material is less than that of spherical TiO2Maximum leakage current density (3.26849 multiplied by 10) on surface of PVDF composite material-17A/m2 vs 4.63407×10-17A/m2) The decrease is about 1.41 times.
3) The superposition of high leakage current can lead the area to generate a large amount of joule heat, improve the local energy density and respectively align to zero-dimensional and one-dimensional TiO2The surface energy density of the/PVDF composite material was subjected to finite element simulation and the results are shown in FIG. 5. From the system energy distribution in FIG. 5, TiO of different dimensions2The filler is added, so that the surface energy distribution of the composite material is changed, and the high-energy-density area is in sharp contrast with the low-energy-density area adjacent to the high-energy-density area.
With spherical TiO2In contrast, linear TiO2The homogenization system has more obvious effect on energy density, and the high energy density area is less and the range is smaller. From the simulation value, linear TiO2The maximum energy density of the surface of the/PVDF composite film is 3.90655 multiplied by 10-14J/m3Comparison of spherical TiO2PVDF, the maximum energy density is reduced by a factor of about 2.01 (3.90655X 10)-14J/m3vs7.85279×10-14J/m3)。
Detailed description of the invention
TiO of different dimensions2Modeling and simulating a PVDF nano composite material two-dimensional model:
1) in the nano composite film, the interface interaction between the filler and the matrix often has a great influence on the dielectric property of the nano composite film, and in order to further research TiO with different dimensions2Interface of filler to nano TiO2The influence of the dielectric property of the PVDF composite film establishes a vertical section two-dimensional model, the size of the model is similar to that of a three-dimensional model, the parameter setting is basically the same, and TiO with different dimensions is established2The doping amount is the same and is 5 vol%. Using COMSOL5.4 to respectively align zero-dimensional and one-dimensional TiO2And performing analog simulation on the electric field intensity in the PVDF composite material.
TiO of different dimensions2The electric field intensity distribution of the/PVDF composite material is shown in FIG. 6. It is clear that TiO varies with the dimensions2Addition of fillers, TiO2The electric field distribution in the PVDF composite film is changed to different degrees, and is basically consistent with the result obtained by a three-dimensional model. In addition, the high electric field area is distributed mainly in TiO in the composite material2One-dimensional TiO at the interface of the PVDF composite film in the direction of the electric field2The effect of the homogenized electric field of PVDF is more obvious, and the high electric field area is less and the range is smaller.
To further study TiO of different dimensions2PVDF composite interface electric field distribution, respectively to zero dimension and one-dimensional TiO2The electric field inside the PVDF composite was post-processed to facilitate a more visual observation of the electric field distribution at the interface, and the results are shown in fig. 7.
The smoother the surface after post-treatment, the more uniform the electric field distribution. The wider the peak is, the larger the high electric field area is, the larger the number of the peak is, the more the local high electric field area is, the larger the difference between the heights of the adjacent peaks is, the larger the voltage difference between the high electric field area and the low electric field area adjacent to the surface is, and the breakdown is easy to form. Different dimension TiO2The electric fields in the PVDF composite film are rearranged, and the high electric field areas are intensively distributed in the TiO2At the interface of the PVDF composite material along an external electric field, when the filler is gathered, the electric field of the area is further enhanced due to the superposition of high electric field areas, and the breakdown is more easily caused.
Clearly, in contrast to the spherical TiO2PVDF composite, linear TiO2The high electric field area of the composite material interface is obviously fewer and has a smaller range, the electric field distribution in the material is more uniform, only a small amount of high electric field is distributed at the two ends of the filler, and the spherical TiO2High electric field regions are intensively distributed at two ends in the direction of the electric field, and a local electric field is gathered near adjacent nano particles along the direction of an external electric field, so that the ultrahigh electric field region is generated, if the adjacent nano particles form channels or clusters along the direction of the electric field, the local electric field is further enhanced, even the adjacent nano particles are lapped with each other to form a conductive path, and therefore TiO is reduced2Breakdown field strength of the PVDF composite.
Linear TiO2Because of the large surface area in the direction perpendicular to the applied electric field, the electric field can be homogenized in a large range. In one dimension only TiO2The nanowire tip has a small increase of an electric field, and it is noted that a local high electric field is generated when the filler tip is too close to the nanowire tip, which also indicates the reason that the filler is uniformly distributed as much as possible in the preparation of the composite material, namely, local electric field distortion caused by filler clusters is avoided, and the local electric field is easy to generate an ultrahigh electric field to cause breakdown.
From the numerical analysis, linear TiO2The average electric field intensity of the interface is 0.0025942V/m and is less than zero-dimensional TiO2Average electric field intensity of (0.0025942V/m vs 0.0032431V/m), notably, in one-dimensional TiO2At the interface, a little abnormally high voltage occurs due to the adjacent TiO2The closer the filler tips are, the higher electric field regions are formed by overlapping the high electric field regions at both ends of the filler, and the electric field is further enhanced if the adjacent nanofillers form channels or clusters along the electric field direction. This is a one-dimensional TiO2The linear Ti is the reason why the PVDF composite film interface generates high electric field, if the curvature of the tip can be reducedO2Greater advantages can be exhibited in avoiding the generation of interfacial high electric field regions and homogenizing the electric field.
2) The superposition of high electric fields inside the material often causes the increase of leakage current, and zero-dimensional and one-dimensional TiO are respectively subjected to the influence of a filler interface on the dielectric property of the composite material for further research2The leakage current density of the/PVDF composite was studied by finite element simulation and the distribution is shown in FIG. 8.
It is clear that TiO varies with the dimensions2Addition of fillers, TiO2The leakage current density distribution in the PVDF composite film is changed to different degrees, and is basically consistent with the result obtained by the three-dimensional model. In addition, the high electric field area is distributed mainly in TiO in the composite material2the/PVDF composite material is arranged in the filler and at the interface of the electric field direction, wherein one-dimensional TiO is arranged in the composite material2The effect of homogenizing leakage current of PVDF is more obvious, and the high electric field area is less and the range is smaller in the filler and at the interface.
To further study TiO of different dimensions2Leakage current density distribution in/PVDF composite material filler and at interface respectively to zero dimension and one-dimensional TiO2The leakage current density distribution in the PVDF composite film is subjected to post-processing so as to observe the leakage current density distribution of the composite material more visually, and the simulation result is shown in figure 9.
From FIG. 9, TiO2From the view of leakage current distribution of the PVDF composite film, the surface peak is mainly concentrated on TiO2Inside the filler and at the interface, spherical TiO2The surface of PVDF post-treated is seriously concave and unsmooth, which shows that the leakage current difference of adjacent areas is too large, and the spherical TiO2PVDF has a weak ability to homogenize leakage current density. The surface peaks inside the spherical filler and at the interface are broad and numerous, illustrating that spherical TiO2The leakage current in the PVDF material is intensively distributed in the filler and an interface, the high leakage current area is more and has a larger range, and the leakage current density with higher and larger range in the composite material can cause the increase of local joule heat, so that the insulation material is melted to accelerate the breakdown process of the composite material.
One-dimensional TiO2/PVThe surface of DF internal leakage current post-treatment is smoother, the surface peak is thinner and less, which shows that one-dimensional TiO2The PVDF has stronger capability of homogenizing leakage current, has a little high leakage current only at the tip of the filler, has less internal high leakage current area and smaller range, has more uniform distribution of leakage current, is difficult to form a conductive path, has less Joule heat caused by high leakage current and is difficult to cause thermal breakdown.
From the numerical analysis, one-dimensional TiO2Average leakage current density of 2.9682 multiplied by 10 of/PVDF composite material-18A/m2Lower than one-dimensional TiO2Average leakage current density (2.9682 x 10) inside PVDF composite filler-18A/m2 vs 3.5318×1010-18A/m2)。
One-dimensional TiO2The uniform and low leakage current density in the PVDF composite material ensures that the system is not easy to generate thermal breakdown and a conductive path, so the one-dimensional TiO2The PVDF composite material has higher breakdown resistance.
3) The high leakage current region causes the region to generate a large amount of joule heat, which in turn causes the local energy density to rise, respectively corresponding to zero and one-dimensional TiO2The energy density distribution of the system in the PVDF composite was simulated as shown in fig. 10.
It is clear that TiO varies with the dimensions2Addition of fillers, TiO2The energy density distribution in the PVDF composite material changes to different degrees and is basically consistent with the obtained result of the three-dimensional model. In addition, the high electric field area is distributed mainly in TiO in the composite material2the/PVDF composite material is arranged at the interface of the filler along the direction of an electric field, wherein one-dimensional TiO is arranged2The effect of energy density of a PVDF homogenization system is more obvious, and the high energy density area is less and the range is smaller.
In order to more intuitively study the energy density at the interface, zero-dimension and one-dimension TiO are respectively studied2The post-treatment results of the internal energy density distribution of the/PVDF composite material are shown in FIG. 11. Zero-dimensional and one-dimensional TiO2The energy density of the system in the PVDF composite material is mainly distributed in TiO2At the interface along the direction of the electric field, the spherical TiO2The surface of the composite material after post-treatment is rough, and the peak is wider, which shows that the spherical TiO is2The larger and more numerous high energy regions of the/PVDF composite interface may result in spherical TiO2The energy of the/PVDF composite material is too high in the area, the generated Joule heat causes the heat loss of the material to be increased, the breakdown process is further accelerated, and finally the breakdown strength is reduced.
With spherical TiO2Linear TiO/PVDF composites2The high energy area of the interface is obviously less, the surface of the post-treatment is smoother, which shows that the energy distribution of the system is more uniform, and only fine peaks exist at the two ends of the filler, which shows that the one-dimensional TiO is2The composite material has a small amount of high-energy regions at two ends of the filler, and one-dimensional TiO2The heat loss of the composite material is not easily increased by compounding, and the breakdown resistance is effectively improved.
In addition, zero-dimensional, one-dimensional TiO2The energy density distribution of the PVDF composite material system is approximately consistent with the electric field distribution of the PVDF composite material system, which shows that the leakage current density near the interface is increased due to the concentrated distribution of the electric field of the interface, and the increase of the leakage current density causes the generation of excessive Joule heat at the interface, so that the energy density of the area is increased.
Numerically, one-dimensional TiO2Average energy density of interface of/PVDF composite material system is 2.2125 multiplied by 10-16J/m3Significantly lower than zero-dimensional TiO2PVDF system interface average energy density (2.2125X 10)-16J/m3 vs 3.73254×10-16J/m3)
Indicating one-dimensional TiO2The PVDF composite material system has low and uniform energy density, can reduce heat loss, slow down the breakdown process and improve the breakdown resistance of the composite material.
The electric field, leakage current and system energy distribution of the nano composite material can influence the breakdown resistance of the composite material, and the invention adopts a finite element method to respectively carry out zero-dimensional and one-dimensional TiO with the same doping amount through two models2Simulating and simulating the electric field intensity, the leakage current density and the energy density of the PVDF composite material, and systematically researching through comparisonTiO is2Influence of the filler morphology on the dielectric property of the PVDF-based composite material. Wherein, one-dimensional TiO2PVDF can significantly improve and homogenize local electric field, leakage current density and interface energy density, theoretically, with zero-dimensional TiO2In contrast, one-dimensional TiO2The maximum specific surface area and the degree of orientation with the same filling amount, and the larger specific surface area perpendicular to the direction of the electric field enables TiO2PVDF has the least influence on the uniform distribution of the Z-axis electric field and the least distortion of the electric field, only a small increase of the electric field exists at the tip of the filler, if the curvature of the tip can be reduced, the one-dimensional TiO has the advantages of2Can show greater advantages in avoiding the generation of interface high electric field area and homogenizing the electric field, thereby improving the TiO2The breakdown resistance of the PVDF nano composite material enables the energy storage density of the composite material to be effectively improved.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
The documents cited in the present invention are as follows:
[1]Wang Y U,Tan D Q.Computational study of filler microstructure and effective property relations in dielectric composites[J].Journal of Applied Physics,2011 109(10):034115.
[2]CHEN J W,WANG X C,et all.High dielectric constant and low dielectric loss poly(vinylidene fluoride)nanocomposites via a small loading of two-dimensional[email protected]hexagonal nanoplates[J].JOURNAL OF MATERIALS CHEMISTRY.C,2018.
Claims (7)
1. TiO 22Dimension pair TiO2The modeling and simulation method for the influence of the dielectric property of the PVDF composite material is characterized by comprising the following steps of:
step one, respectively establishing TiO with different dimensions by adopting a finite element method2Of TiO 22A PVDF nanocomposite system model;
step two, for TiO with different dimensions2Of TiO 22Performing analog simulation on the dielectric property of the PVDF nano composite material; the dielectric properties include electric field strength, leakage current density, and energy density;
acquiring an analog simulation result, wherein the analog simulation result comprises electric field intensity distribution, leakage current density distribution and energy density distribution;
step four, carrying out numerical analysis according to the simulation result to obtain TiO with different dimensions2To TiO 22Conclusion of the influence of the dielectric properties of the PVDF nanocomposite.
2. The TiO of claim 12Dimension pair TiO2The modeling and simulation method for the influence of the dielectric property of the PVDF composite material is characterized by comprising the following steps of: modeling and simulation were performed by using a COMSOL5.4 simulation platform.
3. The TiO of claim 12Dimension pair TiO2The modeling and simulation method for the influence of the dielectric property of the PVDF composite material is characterized by comprising the following steps of: the different dimensions in the step one comprise zero dimension and one dimension.
4. The TiO of claim 32Dimension pair TiO2The modeling and simulation method for the influence of the dielectric property of the PVDF composite material is characterized by comprising the following steps of: the composite material system model in the step one comprises a three-dimensional model and a two-dimensional model.
5. The TiO of claim 42Dimension pair TiO2/PVDThe modeling and simulation method for the influence of the dielectric property of the F composite material is characterized by comprising the following steps of: the composite material system model adopts a current conservation model in an electrostatic field module of a COMSOL5.4 simulation platform, TiO2And PVDF with dielectric constants of 48 and 8.26, respectively, and a conductivity of 10, respectively-10S/m and 10-15S/m，TiO2The volume fraction of doping was 5%.
6. The TiO of claim 42Dimension pair TiO2The modeling and simulation method for the influence of the dielectric property of the PVDF composite material is characterized by comprising the following steps of: the three-dimensional model size is 100nm × 100nm × 100 nm.
7. The TiO of claim 32Dimension pair TiO2The modeling and simulation method for the influence of the dielectric property of the PVDF composite material is characterized by comprising the following steps of: TiO with different dimensions in the fourth step2To TiO 22The conclusion of the influence of the dielectric property of the PVDF nano composite material is as follows: compared with zero-dimensional, one-dimensional TiO2PVDF is able to significantly improve and homogenize local electric fields, leakage current density and energy density.
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