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在碳矩阵中嵌入富含空位的VN集群,用于高性能离子电池
Youcun Bai1, Liang Luo2, Wenliang Song3
1Institute for Materials Science and Devices, School of Materials Science & Engineering, Suzhou University of Science & Technology, Suzhou, 215011, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 13, 2024
概括
化/碳复合材料中的空位通过改善动力学和减少极化,显著提高水性电池的性能. 这种新型材料为先进的能量存储提供了高容量和能量密度.
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:
- 化 (VN) 作为水性电池 (AZIB) 的阴极,由于其高容量和能量密度,显示出前景.
- 由于与离子的强烈静电相互作用引起的缓慢反应动力学,阻碍了基于VN的AZIB中的快速充/放电率.
研究的目的:
- 合成和表征空嵌入的化/碳复合物 (Nv-VN/C-SS-2),以提高AZIB的性能.
- 调查空缺在加速反应动力学和增强电化学性能的作用.
主要方法:
- 合成Nv-VN/C-SS-2复合材料. 这些复合材料包括:
- 电化学表征包括容量,能量密度和功率密度测量.
- 密度功能理论 (DFT) 的计算,以了解离子吸附/脱附机制.
主要成果:
- Nv-VN/C-SS-2复合材料表现出加速反应动力学和减少电化学极化.
- DFT计算证实了在Nv-VN/C-SS-2上增强的离子吸附/溶解,增加了活性位点.
- 准固态电池实现了186.5mAhg-1的高容量,能量密度为278.9Whkg-1和功率密度为2375.1Wkg-1.
结论:
- 在优化AZIB中基于VN的阴极的电化学性能方面,空位至关重要.
- 对VN材料的接口工程,特别是通过缺陷创建,为开发高性能能量存储设备提供了可行的策略.
- Nv-VN/C-SS-2材料是下一代AZIB的有希望的候选者.
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