Research on cross-linked polypropylene polymer dielectric for high temperature energy storage applications
In recent years,rapid development of electromagnetic ejection technology and electric vehi-cle industry requires urgent improvement of thin film dielectric capacitors with high temperature resistance and high energy storage performance.Therefore,the cross-linked antioxidants-linked poly-propylene(PPHP)was heat treated to form a cross-linked three-dimensional network,so as to im-prove the high temperature resistance,high voltage resistance,dielectric properties and energy sto-rage properties of polypropylene.It was found that compared with bidirectional tensile polypropylene(BOPP)and PPHP,the breakdown field strength of grafted cross-linking antioxidant polypropylene(CPP)after heat treatment could reach 1 105 MV/m at room temperature and 647 MV/m at 130℃.At room temperature,the dielectric constant is about 3.0,the dielectric loss is below 0.01,and the energy density is 9.13 J/cm3 under the electric field intensity of 600 MV/m,and the energy release efficiency reaches 94.3%.
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