(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 四川大學(xué) 匹茲堡學(xué)院，成都 610207)
摘 要: 分別采用固相法和溶膠-退火法合成了AgNbO3顆粒(分別定義為AgNO3-1和AgNO3-2)，使用多巴胺對(duì)該顆粒進(jìn)行表面修飾后，再以此為填充物，與P(VDF-HFP)聚合物基體復(fù)合，制備不同AgNbO3填料比的(Dop@AgNbO3)-P(VDF-HFP)復(fù)合材料。采用X射線衍射分析儀(XRD)、掃描電子顯微鏡(SEM)、紅外光譜儀、阻抗分析儀和鐵電工作站等表征了AgNbO3顆粒及其復(fù)合物的物相、微觀結(jié)構(gòu)，探究填料合成工藝及含量對(duì)復(fù)合材料介電及儲(chǔ)能性能的影響規(guī)律。結(jié)果表明：同一種填料合成工藝下制備的(Dop@AgNbO3)- P(VDF-HFP)復(fù)合物，隨著填料比增加，能量密度呈現(xiàn)先增加后減小的趨勢(shì)，在填料比6%(體積分?jǐn)?shù))時(shí)獲得最高儲(chǔ)能密度。此外，在相同的填料比下，基于溶膠-退火法合成的AgNbO3顆粒由于粒徑較小，粒度分布較窄，比表面積較大，使得(Dop@AgNbO3-2)-P(VDF-HFP)復(fù)合物的整體介電和儲(chǔ)能性能優(yōu)于(Dop@AgNbO3-1)-P(VDF-HFP)復(fù)合材料。例如，6% (Dop@AgNbO3-2)-P(VDF-HFP)復(fù)合材料在1 kHz時(shí)的介電常數(shù)為17.6，介電損耗小于0.05；在電場(chǎng)80 kV/mm下的有效能量密度和效率分別為0.46 J/cm3和71.35%。
關(guān)鍵字: AgNbO3；介電復(fù)合材料；P(VDF-HFP)；介電常數(shù)；能量密度
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Pittsburgh Instiute, Sichuan University, Chengdu 610207, China）
Abstract:The AgNbO3 micro-nano particles synthetized by traditional solid-state method (AgNbO3-1) and sol-gel method (AgNbO3-2) were modified with dopamine and then filled with P(VDF-HFP) matrix to prepare Dop@AgNbO3-P(VDF-HFP) nanocomposites. X-ray diffraction analyzer (XRD), scanning electron microscope (SEM), infrared spectrometer, impedance and ferroelectric analyzer were used to characterize the phase and microstructure of AgNbO3 particles and their composites. The influences of synthesis process and loading of AgNbO3 fillers on the dielectric and energy storage performance of composites were explored. The results show that when the Dop@AgNbO3)-P(VDF-HFP) composite is prepared under the same AgNbO3 particles synthesis process, the energy density first increases and then decreases with increasing the filler loading, and the highest energy density is obtained at 6% AgNbO3 filler loading. In addition, at the same fillers loading, (Dop@AgNbO3-2)-P(VDF-HFP) composites show superior dielectric and energy storage performance compared with (Dop@AgNbO3-1)-P(VDF-HFP) composites due to a smaller particle size, narrower particle size distribution and larger specific surface area of AgNbO3-2 particles. For instance, at 1k Hz, the dielectric constant and loss of 6% (Dop@AgNbO3-2)-P(VDF-HFP) composite are 17.6 and 0.05, respectively. At the electric field of 80 kV/mm, the discharged energy density and efficiency are 0.46 J/cm3 and 71.35%, respectively.
Key words: AgNbO3; dielectric composites; P(VDF-HFP); dielectric constant; energy density
