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用于高性能水性离子电池的W-doped VO2
Guangxu Yang1, Shuhua Yang1, Jinfeng Sun1
1School of Material Science and Engineering, University of Jinan, Jinan 250022, China. yangshuhua78@163.com.
Physical chemistry chemical physics : PCCP
|September 14, 2023
概括
研究人员为水性离子电池 (AZIB) 开发了 tungsten-doped 二氧化 (W-VO2). 这种正极材料表现出改进的动力学,高能量密度和长周期寿命,为更安全,更具成本效益的能源存储铺平了道路.
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) 对安全和低成本的储能充满希望.
- 开发具有快速动力学和高能量密度的稳定阴极对于AZIBs至关重要.
- 纯二氧化 (VO2) 阴极在实际应用中面临性能限制.
研究的目的:
- 为了合成和表征 tungsten-doped 二氧化 (W-VO2) 作为AZIBs的阴极材料.
- 研究W兴奋剂对VO2的结构稳定性和电化学动力学的影响.
- 为了评估AZIB中的W-VO2阴极的能量密度,速率能力和周期寿命.
主要方法:
- 对于W-doped VO2 (W-VO2) 材料的一步热水合成方法.
- 结构分析以确认W插入和格子扩张.
- 电化学测试包括充放电循环,速率能力测试和长期循环稳定性测量.
主要成果:
- 由于W6+预插入和W-O键形成,W-VO2表现出扩大的格子间距和稳定的结构.
- 在0.2 A g-1下达到340.2 mA h g-1的高特异容量.
- 证明了出色的高速率能力 (186.9 mA h g-1 在 10 A g-1) 和长期循环稳定性 (2000 个循环后保持 76.5%).
结论:
- 兴奋剂显著提高了AZIBs中VO2阴极的电化学性能.
- 与纯VO2相比,W-VO2阴极提供了更好的动力学,高能量密度和更高的周期寿命.
- 这种W兴奋剂策略为AZIBs开发先进的高能和稳定的阴极提供了可行的途径.
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