Preparation And Research On Energy Storage Performance Of Barium Titanate/Polyaniline/Polyimide Composite Film

With the rapid development of the electronics industry,the research and development of key materials for high-energy storage devices is attracting more and more attention from scientific and technological workers in the materials field.The demand for materials with small size and large energy storage density has promoted the development of the microcapacitor industry.However,all organic polymer materials have a low dielectric constant,while traditional ceramic materials have high dielectric loss and poor flexibility.In order to improve the respective problems of polymers and inorganic ceramics,these two materials with different characteristics are combined together.The polymer-based composite functional material doped with inorganic particles is prepared.In order to make the composite material have better dielectric and mechanical properties,this paper selects the matrix material-polyimide(PI),which has excellent dielectric and mechanical properties and has very good application prospects in the microelectronics industry.Matrix,polyaniline(PANI)is added to the PI system,and a polyaniline/polyimide composite film is prepared by the coating process.The optimal ratio of performance was selected to add inorganic ceramic nano-barium titanate(BT)particles to study the energy storage characteristics of the composite film.The specific research content is as follows:(1)The PANI/PI composite film was prepared by coating and thermal imidization.The scanning electron microscope results showed that PANI was evenly distributed in the PI matrix;the tensile modulus of the film doped with 10wt.%PANI was the highest,2161 MPa;The dielectric test results showed that with the increase of PANI doping,the dielectric constant of the PANI/PI composite film showed a trend of first increasing and then decreasing,and the breakdown field strength continued to decrease.When PANI is a PANI/PI composite film with a doping amount of 10 wt.%at a frequency of 10~3Hz,the dielectric constant reaches 5.54,the breakdown field strength is 989.19 k V/cm,and the discharge energy density is 10 wt.%PANI/PI The maximum component composite film is 0.57 J/cm~3.According to the energy storage formula,the energy storage density of the film is about 0.24 J/cm~3,which is about 10%higher than the pure PI film.(2)PANI was selected as a 10 wt.%component,and BT particles of different mass fractions were doped into the PI matrix to prepare BT/PANI/PI composite films,and their properties were characterized.Scanning electron microscopy results show that BT particles can be uniformly compounded into the film;the tensile modulus of the composite film gradually decreases with the increase of the BT content,and the tensile modulus of the film with a doping content of 5 wt.%is 1906 MPa;the composite film With the increase of the BT content,the dielectric constant of BT presents a continuous increase,and the breakdown field strength continues to decrease.When the BT/PANI/PI composite film with a BT doping amount of 5 wt.%is at a frequency of 10~3Hz,the dielectric constant reaches 12.3,the breakdown field strength is 836.18 k V/cm,and the 5 wt.%addition amount of BT/The PANI/PI composite film has the largest discharge energy density,0.86 J/cm~3;the energy storage density calculated according to the energy storage formula is about 0.38 J/cm~3,which is about 73%higher than the pure film.