Entropy-assisted low-electrical-conductivity pyrochlore for capacitive energy storage
文献类型：期刊论文
| 作者 | Luo, Zixi2; Lan, Shun2; Yang, Bingbing1,2; Yang, Yueyang2; Zhou, Zhifang2; Liu, Yiqian2; Dou, Lvye2; Zhang, Min2 ; Nan, Ce -Wen2; Lin, Yuan -Hua2
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| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2024-08-15 |
| 卷号 | 275 |
| 关键词 | High entropy Insulation Pyrochlore Energy storage |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2024.120079 |
| 通讯作者 | Lan, Shun(15311753562@163.com) ; Lin, Yuan -Hua(linyh@tsinghua.edu.cn) |
| 英文摘要 | Capacitors with high energy storage performances are highly desired for the miniaturization, lightweight, and integration of high-end pulse systems. However, the trade-off between dielectric constant and breakdown strength restricts further performance optimization. To improve energy storage properties, a new tactic with rising attention, the high-entropy concept, has been demonstrated to suppress leakage current and enlarge the breakdown strength. However, the mechanisms connecting the insulation properties and entropy are still unclear. Herein, we successfully fabricated a series of entropy-modulated Cd2Nb2O7-based pyrochlore ceramics via the doping of multiple elements, and high-entropy pure pyrochlore was obtained due to the entropy-stabilization effect. Our results revealed that the insulation properties are distinctly enhanced via the enlarged carrier transport barriers and reduced carrier concentration, which should be attributed to entropy-induced large lattice distortion, grain-refining, and fewer defects. The optimized insulation properties significantly enhance breakdown strength from 148 kV cm-1 to 457 kV cm-1. A high energy density of 2.29 J cm-3 with a high energy efficiency of 88% is thus achieved in the high-entropy ceramic, which is 150% higher than the pristine material. This work indicates the effectiveness of high-entropy design in the improvement of energy storage performance, which could be applied to other insulation-related functionalities. |
| WOS关键词 | PHASE ; RELAXATION ; PEROVSKITE ; EVOLUTION ; CONSTANT ; OXIDES ; FILMS |
| 资助项目 | National Key Research Program of China[2021YFB3800601] ; Basic Science Center Project of the National Natural Science Foundation of China[52388201] ; National Natural Science Foundation of China[52102275] ; Shuimu Tsinghua Scholar Program of Tsinghua University |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001251941000001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Key Research Program of China ; Basic Science Center Project of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; Shuimu Tsinghua Scholar Program of Tsinghua University |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/136487]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Lan, Shun; Lin, Yuan -Hua |
| 作者单位 | 1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 2.Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Zixi,Lan, Shun,Yang, Bingbing,et al. Entropy-assisted low-electrical-conductivity pyrochlore for capacitive energy storage[J]. ACTA MATERIALIA,2024,275. |
| APA | Luo, Zixi.,Lan, Shun.,Yang, Bingbing.,Yang, Yueyang.,Zhou, Zhifang.,...&Lin, Yuan -Hua.(2024).Entropy-assisted low-electrical-conductivity pyrochlore for capacitive energy storage.ACTA MATERIALIA,275. |
| MLA | Luo, Zixi,et al."Entropy-assisted low-electrical-conductivity pyrochlore for capacitive energy storage".ACTA MATERIALIA 275(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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