Article(id=1319973055011602925, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, articleNumber=null, orderNo=null, doi=10.14062/j.issn.0454-5648.20230656, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1693411200000, receivedDateStr=2023-08-31, revisedDate=1698076800000, revisedDateStr=2023-10-24, acceptedDate=null, acceptedDateStr=null, onlineDate=1792635700227, onlineDateStr=2026-10-22, pubDate=1713542400000, pubDateStr=2024-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792635700227, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792635700227, creator=13701087609, updateTime=1792635700227, updator=13701087609, issue=Issue{id=1319973019079000285, tenantId=1146029695717560320, journalId=1263187385517883426, year='2024', volume='52', issue='4', pageStart='1171', pageEnd='1476', issueExtLink='null', onlineDate='null', pubDate='1713542400000', pubDateStr='2024-04-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792635691661, creator='13701087609', updateTime=1792641833008, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1319998777822396474, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1319998777822396475, tenantId=1146029695717560320, journalId=1263187385517883426, issueId=1319973019079000285, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1320, endPage=1325, ext={EN=ArticleExt(id=1319973055191957998, articleId=1319973055011602925, tenantId=1146029695717560320, journalId=1263187385517883426, language=EN, title=Energy Storage Performance of KNbO3 Nanofiber/P(VDF-HFP)&PMMA Composite Films, columnId=1321894869182828764, journalTitle=Journal of the Chinese Ceramic Society, columnName=Special Issue on Dielectric Energy Storage Materials—Research Article, runingTitle=null, highlight=null, articleAbstract=
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, KNbO3 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 KNbO3 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 KNbO3 nanofibers, 36 g KOH and 1 g Nb2O5 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 dissolved in 10 mL N,N-Dimethylacetamide (DMAC) at 80 ℃. KNbO3 nanofibers with different mass fractions (x=0, 2.5%, 5.0%, 7.5%, and 10.0%) were dispersed in the DMAC solution under magnetically stirring to obtain the mixture, and then the mixture was added into the P(VDF-HFP)&PMMA solutions. The composite films were prepared by a tape casting and subsequently dried at 90 ℃. The thickness of the prepared films was 20 μm. Au electrodes (2 mm in diameter) were sputtered on the composite films for the coming electrical measurements.

Results and discussion

Based on the crystal structure of the KNbO3 nanofibers detected by XRD, the nanofibers exhibit a pure orthorhombic perovskite structure in coincidence with the standard JCPDS 32-0822. A high diffraction intensity reflects a good crystallinity of KNbO3 nanofibers. In addition, the widen diffraction peaks show the small size of KNbO3 nanofibers. From the TEM and SEM images, KNbO3 nanofibers have a uniform microscopy with a diameter of 10-20 nm and the length of ~500 nm. The distinct lattice fingers and selected area electron diffraction patterns confirm a good crystallinity of KNbO3 nanofibers. Besides, all the elements uniformly distribute for KNbO3 nanofibers.

The frequency-dependent dielectric constants of composite films with x of 0, 2.5%, 5.0%, 7.5%, and 10.0% are 2.8, 5.2, 6.1, 8.2, and 11.5, respectively. KNbO3 nanofibers enhance the dielectric properties of composite films because of the intense ferroelectricity and the Maxwell-Wagner-Sillars interface effect. In addition, all the films exhibit a low dielectric loss, indicating the superior breakdown strength.

The polarization intensity at the same external electric field increases with the increase of KNbO3 nanofiber fillers. Besides, the breakdown electric field reduces as the KNbO3 nanofibers increases because a severe electric field deformation nearby KNbO3 nanofiber fillers generates a high local electric field distribution. Therefore, the energy storage density firstly increases and then decreases, achieving an optimal value of 14.3 J/cm3 when 7.5% (in mass fraction) KNbO3 nanofibers are doped in the composite films. Also, the energy storage efficiency of the optimized composites is 72%.

Conclusions

The ferroelectric nano-materials were filled into the polymers to enhance the energy storage performance of composite capacitors. KNbO3 nanofibers prepared by a hydrothermal method exhibited a high aspect ratio and a good crystallinity. KNbO3 nanofibers were mixed with P(VDF-HFP)&PMMA polymers to prepare KNbO3/P(VDF-HFP)&PMMA composite films. The polarization strength of composite films was enhanced. Meanwhile, the breakdown strength of composite films slightly degraded. Therefore, the optimum energy storage density of 14.3 J/cm3 and efficiency of 72% were achieved when 7.5% KNbO3 nanofibers were doped in the composite films. The results indicated that KNbO3 nanofibers could effectively enhance the energy storage performance of composite capacitors.

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HUAN Yu (1990-), female, Ph.D., Associate Professor. E-mail:

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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KNbO3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。KNbO3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KNbO3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/cm3,储能效率为72%。本工作证实KNbO3纳米线填料可以有效增强复合薄膜的储能性质。

, authors=郇宇, 王晓智, 彭博, 朱元娜, authorsList=郇宇, 王晓智, 彭博, 朱元娜, authorCompany=null, correspAuthors=null, authorNote=

郇宇(1990—),女,博士,副教授。

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KNbO3纳米线/P(VDF-HFP)&PMMA复合薄膜的储能性质
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郇宇 , 王晓智 , 彭博 , 朱元娜
硅酸盐学报 | 电介质储能材料专刊—研究论文 2024,52(4): 1320-1325
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硅酸盐学报 |电介质储能材料专刊—研究论文 2024 , 52 (4) : 1320 -1325
KNbO3纳米线/P(VDF-HFP)&PMMA复合薄膜的储能性质
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郇宇 , 王晓智, 彭博, 朱元娜
作者信息
  • 济南大学材料科学与工程学院,济南 250022
作者简介:

郇宇(1990—),女,博士,副教授。

Energy Storage Performance of KNbO3 Nanofiber/P(VDF-HFP)&PMMA Composite Films
Yu HUAN , Xiaozhi WANG, Bo PENG, Yuanna ZHU
Affiliations
  • School of Materials Science and Engineering, University of Jinan, Jinan 25022, China
  • HUAN Yu (1990-), female, Ph.D., Associate Professor. E-mail:

出版时间: 2024-04-20 doi: 10.14062/j.issn.0454-5648.20230656
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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KNbO3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。KNbO3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KNbO3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/cm3,储能效率为72%。本工作证实KNbO3纳米线填料可以有效增强复合薄膜的储能性质。

聚合物储能电容器  /  纳米线  /  铌酸钾  /  铁电材料
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, KNbO3 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 KNbO3 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 KNbO3 nanofibers, 36 g KOH and 1 g Nb2O5 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 dissolved in 10 mL N,N-Dimethylacetamide (DMAC) at 80 ℃. KNbO3 nanofibers with different mass fractions (x=0, 2.5%, 5.0%, 7.5%, and 10.0%) were dispersed in the DMAC solution under magnetically stirring to obtain the mixture, and then the mixture was added into the P(VDF-HFP)&PMMA solutions. The composite films were prepared by a tape casting and subsequently dried at 90 ℃. The thickness of the prepared films was 20 μm. Au electrodes (2 mm in diameter) were sputtered on the composite films for the coming electrical measurements.

Results and discussion

Based on the crystal structure of the KNbO3 nanofibers detected by XRD, the nanofibers exhibit a pure orthorhombic perovskite structure in coincidence with the standard JCPDS 32-0822. A high diffraction intensity reflects a good crystallinity of KNbO3 nanofibers. In addition, the widen diffraction peaks show the small size of KNbO3 nanofibers. From the TEM and SEM images, KNbO3 nanofibers have a uniform microscopy with a diameter of 10-20 nm and the length of ~500 nm. The distinct lattice fingers and selected area electron diffraction patterns confirm a good crystallinity of KNbO3 nanofibers. Besides, all the elements uniformly distribute for KNbO3 nanofibers.

The frequency-dependent dielectric constants of composite films with x of 0, 2.5%, 5.0%, 7.5%, and 10.0% are 2.8, 5.2, 6.1, 8.2, and 11.5, respectively. KNbO3 nanofibers enhance the dielectric properties of composite films because of the intense ferroelectricity and the Maxwell-Wagner-Sillars interface effect. In addition, all the films exhibit a low dielectric loss, indicating the superior breakdown strength.

The polarization intensity at the same external electric field increases with the increase of KNbO3 nanofiber fillers. Besides, the breakdown electric field reduces as the KNbO3 nanofibers increases because a severe electric field deformation nearby KNbO3 nanofiber fillers generates a high local electric field distribution. Therefore, the energy storage density firstly increases and then decreases, achieving an optimal value of 14.3 J/cm3 when 7.5% (in mass fraction) KNbO3 nanofibers are doped in the composite films. Also, the energy storage efficiency of the optimized composites is 72%.

Conclusions

The ferroelectric nano-materials were filled into the polymers to enhance the energy storage performance of composite capacitors. KNbO3 nanofibers prepared by a hydrothermal method exhibited a high aspect ratio and a good crystallinity. KNbO3 nanofibers were mixed with P(VDF-HFP)&PMMA polymers to prepare KNbO3/P(VDF-HFP)&PMMA composite films. The polarization strength of composite films was enhanced. Meanwhile, the breakdown strength of composite films slightly degraded. Therefore, the optimum energy storage density of 14.3 J/cm3 and efficiency of 72% were achieved when 7.5% KNbO3 nanofibers were doped in the composite films. The results indicated that KNbO3 nanofibers could effectively enhance the energy storage performance of composite capacitors.

polymer energy storage capacitor  /  nanofiber  /  potassium niobite  /  ferroelectric materials
郇宇, 王晓智, 彭博, 朱元娜. KNbO3纳米线/P(VDF-HFP)&PMMA复合薄膜的储能性质. 硅酸盐学报, 2024 , 52 (4) : 1320 -1325 . DOI: 10.14062/j.issn.0454-5648.20230656
Yu HUAN, Xiaozhi WANG, Bo PENG, Yuanna ZHU. Energy Storage Performance of KNbO3 Nanofiber/P(VDF-HFP)&PMMA Composite Films[J]. Journal of the Chinese Ceramic Society, 2024 , 52 (4) : 1320 -1325 . DOI: 10.14062/j.issn.0454-5648.20230656
  • 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)
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doi: 10.14062/j.issn.0454-5648.20230656
  • 接收时间:2023-08-31
  • 首发时间:2026-10-22
  • 出版时间:2024-04-20
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  • 收稿日期:2023-08-31
  • 修回日期:2023-10-24
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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)
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    济南大学材料科学与工程学院,济南 250022
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2种不同金属材料的力学参数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
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