短距离订购的VO6氧化物与无氧空缺的框架提高离子电池性能
Weikang Jiang1,2, Kaiyue Zhu2,3, Weili Xie2,3
1Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Small (Weinheim an der Bergstrasse, Germany)
|May 3, 2025
概括
研究人员通过专注于[VO6]八面体并消除氧气空缺,优化了氧化物阴极用于水性离子电池 (AZIB). 这一策略提高了先进电池性能的容量和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于的正极对水性离子电池 (AZIB) 是有前途的,因为其理论容量很高.
- 在开发高性能阴极和AZIBs有效设计原则方面仍然存在挑战.
- 氧化瓦纳中的结构性构建块显著影响电池容量和稳定性.
研究的目的:
- 为了研究结构性构建块 ([VO4], [VO5], [VO6]) 在AZIBs的基氧化物中的作用.
- 了解氧气空缺如何影响氧化阴极的稳定性.
- 设计和合成一个优化的氧化瓦纳阴极,以提高AZIB性能.
主要方法:
- 对[VO4]四面体,[VO5]方形金字塔和[VO6]八面体对阴极性能贡献的分析.
- 研究氧气空缺对[VO6]构建块稳定性的影响.
- 无形氧化物 (无ZVO-O_v) 与无氧空位[VO6]八面体的合成.
主要成果:
- [VO6]八面体在瓦纳氧化物中的其他构建块相比,表现出更高的容量和稳定性.
- 氧气空隙通过增加暴露的位来破坏[VO6]八面体的稳定.
- 合成的无ZVO-O_v阴极实现了高特异容量 (483mAhg-1在0.3Ag-1时) 和优异的容量保留 (94%在150个循环后).
结论:
- 排列在短距离的有序链中的无氧空缺[VO6]八面体最大限度地利用了活性站点.
- 在原子和框架层面的合理设计对于开发高性能基氧化物至关重要.
- 这些发现为AZIB技术的实际应用铺平了道路.
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