KNbO_(3)纳米线/P(VDF–HFP)&PMMA复合薄膜的储能性质  

Energy Storage Performance of KNbO_(3)Nanofiber/P(VDF–HFP)&PMMA Composite Films

作　　者：郇宇 王晓智 彭博 朱元娜[1] HUAN Yu;WANG Xiaozhi;PENG Bo;ZHU Yuanna(School of Materials Science and Engineering,University of Jinan,Jinan 25022,China)

机构地区：[1]济南大学材料科学与工程学院,济南250022

出　　处：《硅酸盐学报》2024年第4期1320-1325,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52072150);泰山学者工程;山东省自然科学基金重大基础研究项目(ZR2022ZD39)。

摘　　要：高性能的铁电纳米材料经常被填充进聚合物,来提高聚合物电容器的储能性质。通过水热法合成了结晶性好、长径比高的KNbO_(3)纳米线,并与偏氟乙烯–六氟丙烯和聚甲基丙烯酸甲酯聚合物复合制备了复合薄膜。KNbO_(3)纳米线大幅度提高了复合薄膜的极化强度,略微降低了复合薄膜的击穿场强。当KNbO_(3)纳米线的填充量为7.5%(质量分数)时,储能性能达到最优值,此时复合薄膜的储能密度为14.3 J/cm^(3),储能效率为72%。本工作证实KNbO_(3)纳米线填料可以有效增强复合薄膜的储能性质。Introduction Polymer–based dielectrics with ultrahigh power density,good flexibility and easy-processing have attracted much attention in powering electronics such as capacitor,power transmission,pulsed power systems and microelectronic systems.However,the low energy density affects the application in electronics industry.Recently,introducing the ferroelectric ceramic fillers with a high dielectric constant into the polymer matrix can improve the dielectric constant of polymer composite dielectric materials.In general,the microscopy of fillers has a great influence on the energy storage performance of polymer–based dielectric capacitors.One-dimensional nanomaterials are potential to fabricating the high-performance polymer-based dielectric capacitors due to their quantum size effect,surface effect and macroscopic quantum tunneling effect.When one-dimensional nano-ferroelectric materials are introduced into the composites,a high length−diameter ratio can reduce the specific surface area and enhance the dispersion in the polymer matrix.Also,the composites can obtain better energy storage properties with a lower filler content due to its large electric dipole.In this paper,KNbO_(3)nanofibers with a good crystalline and a high length-diameter ratio were firstly synthesized via hydrothermal reaction.Polymer-based dielectric capacitors were then fabricated with KNbO_(3)nanofibers and poly(vinylidene fluoride-co-hexafluoropropylene)&polymethyl methacrylate(P(VDF–HFP)&PMMA)polymers.The recoverable energy storage density and energy storage efficiency were analyzed.Methods For the synthesis of KNbO_(3)nanofibers,36 g KOH and 1 g Nb_(2)O_(5) were mixed in a 60 mL beaker and then were stirred for 1 h.Afterwards,the solution was transferred to a 100 mL reactor for hydrothermal reaction at 180℃for 12 h.The particles were washed using deionized water and ethanol for several times and dried at 60℃for 12 h.Finally,the composite films were prepared through a solution-casting method.0.9 g P(VDF−HFP)and 0.1 g PMMA were

关 键 词：聚合物储能电容器 纳米线 铌酸钾 铁电材料 

分 类 号：TQ174[化学工程—陶瓷工业]