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调节VO2中的晶体方向,用于具有增强伪容量的水性电池
Weijia Wang1, Cheng Feng1, Lin Lei1
1State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China.
ACS applied materials & interfaces
|February 20, 2024
概括
在阴极中调整二氧化瓦纳 (VO) 晶体的方向可以提高水性电池的性能. 基醇衍生 (110) 导向的 VO2 阴极显著提高了能量储存能力和周期稳定性.
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:
- 水性电池对储能充满希望,但在阴极速率能力和循环稳定性方面存在局限性.
- 阴极材料的晶体方向是影响电化学性能的关键因素,但尚未得到充分探索.
研究的目的:
- 开发具有可控制晶体方向的二氧化瓦纳 (VO) 阴极,以提高水性电池性能.
- 研究不同晶体面对离子储存机制的影响.
主要方法:
- 使用各种聚合物 (甘油,红醇,西醇,曼尼醇) 调整VO2晶体方向的水热合成.
- 描述VO2的形态和晶体结构.
- 使用定制的VO2阴极对水性电池进行电化学测试.
主要成果:
- 克西醇衍生的VO2呈现出以 (110) 为导向的结构,具有超薄的纳米板形态.
- 与 (001) 导向的 VO2 (61.6%) 相比, (110) 导向的 VO2 显示出增强的伪容量 (76.1%).
- 带有 (110) -VO2阴极的水性电池实现了高可逆容量,在0.5 A g-1时达到317 mAh g-1,在10 A g-1时达到220 mAh g-1,在2000个循环中保持了81.0%的容量.
结论:
- 展示了简单的合成方法来定制VO2晶体的方向.
- 对不同VO2面上的Zn2+存储机制的理解得到了进一步的发展.
- 量身定制的VO2晶体方向为开发高性能水性电池的先进阴极材料提供了一个有希望的战略.
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