摘要
为探究纳米复合电介质的陷阱分布特性及其对储能性能的提升机理,本文制备三种聚丙烯纳米复合电介质,并测试其理化、介电及储能特性。测试结果表明,掺杂氮化硼纳米片的试样具有更高的熔融温度、结晶度、极化强度、电阻率、击穿强度及储能密度。分析发现,聚丙烯纳米复合电介质电导率的电场依赖性符合指数陷阱下的跳跃电导模型,其温度依赖性满足Meyer-Neldel补偿规则,这表明纳米复合电介质中的指数型分布陷阱与基体的机理相同。同时,拟合结果表明纳米掺杂主要改变最深陷阱能级,其与结晶度成正比,并基于缨状微束模型解释了陷阱能级增大和储能密度提升的机理。纳米粒子引入的有序紧密的界面区会束缚分子运动,进而阻碍电荷输运和能量积累,表现为电导率下降和击穿强度提高,最终实现储能性能的提升。
In order to explore the trap distribution characteristics of nanocomposite dielectrics and its mechanism of improving energy storage performance,three polypropylene nanocomposite dielectrics are prepared,and their physicochemical,dielectric and energy storage properties are tested.The test results show that the samples doped with boron nitride nanosheets have higher melting temperature,crystallinity,polarization strength,resistivity,breakdown strength and energy storage density.The experimental results show that the electric field dependence of pure polypropylene and nanocomposites conforms to the hopping conductance model under the exponential trap.The temperature dependence meets the Meyer-Neldel compensation rule,which indicates that the mechanism of exponential distribution trap in nanocomposite dielectric is the same as that of matrix.The fitting results show that nano-doping mainly changes the deepest trap energy in the composites,which is proportional to the crystallinity.The mechanism of increasing trap energy level and energy storage density is explained based on fringed microbeam model.This indicates that the ordered and tight interfacial region of the nanocomposites will restrict the movement of molecules,thus hindering charge transport and energy accumulation,which will improve the resistivity and breakdown strength of the material,and finally realize the improvement of energy storage performance.
作者
张源朔
闵道敏
高梓巍
朱远惟
王诗航
ZHANG Yuanshuo;MIN Daomin;GAO Ziwei;ZHU Yuanwei;WANG Shihang(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049)
出处
《电气技术》
2023年第9期11-19,共9页
Electrical Engineering
基金
国家自然科学基金面上项目(52077162)
国家自然科学基金委员会与中国工程物理研究院联合基金项目(U1830131)
电力设备电气绝缘国家重点实验室课题(EIPE22301)。
关键词
聚丙烯纳米复合电介质
电导率
陷阱分布特性
击穿强度
储能性能
polypropylene nanocomposites
conductivity
trap distribution characteristic
break-down strength
energy storage performance
