本文關(guān)鍵詞： 多孔Ba_(0.6)Sr_(0.4)TiO_3粉體 Ba_(0.6)Sr_(0.4)TiO_3/PVDF復(fù)合材料 介電常數(shù) 擊穿場(chǎng)強(qiáng) 儲(chǔ)能密度　出處：《北京化工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文首先通過(guò)直接沉淀法制備了在室溫下處于順電相的鈦酸鍶鋇BaxSr1-xTiO3 (x=0.2、0.3、0.5和0.6)納米粉體；借助液相澆鑄法制備成BaxS1-xTiO3/PVDF系列復(fù)合材料,對(duì)其性能測(cè)試發(fā)現(xiàn)Ba0.6Sr0.4TiO3的納米粉體制備的復(fù)合材料具有高的材料儲(chǔ)能密度。將該粉體作為原料,采用溶膠-凝膠法在其表面上包覆了同質(zhì)的多孔Ba0.6Sr0.4TiO3層,研究了Ba0.6Sr0.4TiO3多孔包覆層與被包覆粉體的比例、造孔劑P123和反應(yīng)溫度對(duì)制備多孔粉體的影響,通過(guò)測(cè)量多孔Ba0.6Sr0.4TiO3粉體與PVDF復(fù)合制備Ba0.6Sr0.4TiO3/PVDF的電性能,并通過(guò)電滯回線測(cè)量分析了添加多孔粉體對(duì)復(fù)合材料儲(chǔ)能密度提高的機(jī)制。采用直接沉淀法可以制備出立方相,形貌為球形的50nm BaxSr1-xTiO3粉體(x=0.2、0.3、0.5和0.6)。在1 kHz下,當(dāng)BaxSr1-xTiO3粉體的添加比例為7 vol%時(shí),BaxSr1-xTiO3/PVDF復(fù)合材料的介電常數(shù)均在14左右,其中Ba0.6Sr0.4TiO3/PVDF復(fù)合材料擊穿場(chǎng)強(qiáng)為219.24 kV·mm-1,根據(jù)測(cè)量的電滯回線計(jì)算的儲(chǔ)能密度,達(dá)到2.91 J·cm3,為純PVDF儲(chǔ)能密度的1.68倍。采用溶膠-凝膠法在溶膠生成溫度為65℃、造孔劑P123用量與包覆層粉體的比例為0.1、包覆層與所包覆粉體的比例為2：1的條件下可以生成同質(zhì)多孔Ba0.6Sr0.4TiO3。多孔Ba0.6Sr0.4TiO3粉體的添加量為7 vo1%時(shí),制備的Ba0.6Sr0.4TiO3/PVDF復(fù)合材料的介電常數(shù)為15,擊穿場(chǎng)強(qiáng)達(dá)到289.64 kV·mm-1,根據(jù)復(fù)合材料的電滯回線可計(jì)算出儲(chǔ)能密度為3.70J·Cm-3,是純PVDF儲(chǔ)能密度的2.14倍；進(jìn)一步提高復(fù)合材料中Ba0.6Sr0.4TiO3粉體的添加比例時(shí),復(fù)合材料的介電常數(shù)雖有所提高,但是擊穿場(chǎng)強(qiáng)和儲(chǔ)能密度均有所下降。多孔Ba0.6Sr0.4TiO3粉體比表面的增加能夠使聚合物產(chǎn)生一定的拉伸,導(dǎo)致晶格位錯(cuò),從而捕獲更多的電子使得擊穿場(chǎng)強(qiáng)增加,且粉體的順電性可以降低材料的剩余極化強(qiáng)度,進(jìn)而提高復(fù)合材料的儲(chǔ)能密度。
[Abstract]:In this paper, the nanocrystalline powders of barium strontium titanate (BaxSr1-xTiO3) and barium strontium titanate (BaxSr1-xTiO3) at room temperature were prepared by direct precipitation method, and BaxS1-xTiO3/PVDF series composites were prepared by liquid phase casting. It was found that the composite prepared by nano-powder of Ba0.6Sr0.4TiO3 had high energy storage density. The composite was coated with homogeneous porous Ba0.6Sr0.4TiO3 layer on the surface by sol-gel method. The effects of the ratio of porous coating layer of Ba0.6Sr0.4TiO3 and coated powder, the pore-making agent P123 and reaction temperature on the preparation of porous powder were studied. The electrical properties of Ba0.6Sr0.4TiO3/PVDF prepared by composite of porous Ba0.6Sr0.4TiO3 powder and PVDF were measured. The mechanism of adding porous powder to increase the energy storage density of composites was analyzed by hysteretic loop measurement. The cubic phase of 50nm BaxSr1-xTiO3 powder with spherical morphology was prepared by direct precipitation method. The dielectric constant of BaxSr1-xTiO3 / PVDF composites is about 14 when the addition ratio of BaxSr1-xTiO3 powder is 7 vol%, and the breakdown field strength of Ba0.6Sr0.4TiO3/PVDF composites is 219.24 kV 路mm-1.The energy density calculated from the measured hysteresis loop is used to calculate the energy storage density of BaxSr1-xTiO3 / PVDF composites, and the dielectric constant of BaxSr1-xTiO3 / PVDF composites is about 14. The energy density of pure PVDF was 1.68 times that of pure PVDF. The sol-gel method was used at 65 鈩，

本文編號(hào)：1544833