化瓦纳酸纳米带具有稳定的结构和快速离子扩散作为准固态离子电池的阴极
Penghua Liang1,2,3, Kongjun Zhu1, Yu Rao1,4
1State Key Laboratory of Mechanics and Control for Aerospace Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, People's Republic of China.
ACS applied materials & interfaces
|May 2, 2024
概括
化瓦纳酸盐 (CaVO-2) 作为水性离子电池 (AZIB) 的高性能阴极. 它的纳米结构和中间层水增强了离子运输,使其具有高容量和快速充电.
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:
- 水性离子电池 (AZIB) 对可持续的储能充满希望.
- 开发高性能阴极材料对于推进AZIB技术至关重要.
- 化金属氧化物由于其可调节的结构和离子传输特性,提供了潜在的潜力.
研究的目的:
- 作为AZIBs的阴极材料,研究水合瓦纳酸盐 (CaVO-2).
- 了解结构水和Ca2+插入在离子运输动力学上的作用.
- 为了评估CaVO-2在水态和准固态AZIB中的电化学性能.
主要方法:
- 化瓦纳酸纳米丝带 (CaVO-2) 的合成.
- 电化学表征包括静电循环和速率能力测试.
- 密度函数理论 (DFT) 计算以建模离子扩散机制.
- 用水凝电解质制造和测试准固态AZIB.
主要成果:
- CaVO-2纳米丝带表现出增强的Zn2+运输,由于缩短的扩散路径和结构水所促进的层间间距离增加.
- DFT计算证实了Ca2+和水的纳入后离子扩散动力学的改进.
- 带有CaVO-2阴极的AZIB提供329.6mAhg-1在200mAg-1的高特异性容量和出色的速率能力 (147mAhg-1在10Ag-1).
- 准固态AZIB表现出了显著的稳定性,在1万个循环中保持了162mAhg-1,在5Ag-1时保持了10,000mAhg-1.
结论:
- 化瓦纳酸盐 (CaVO-2) 是AZIBs的高效阴极材料.
- 层间结构水和Ca2+离子的存在显著提高了离子扩散和电池性能.
- 这项工作为设计高性能离子电池的先进阴极材料提供了可行的策略,包括固态配置.
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