在氧化中具有竞争力的降氧化工学,用于超快速和持久的存储
Xiaobo Ding1, Jianhao Lin1, Huiying Huang1
1School of Environment and Energy, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510640, People's Republic of China.
Nano-micro letters
|August 10, 2023
概括
氧化阳极由于过度减少,其稳定性不佳. 将纳入VNbO4阳极可以防止这种情况,提高循环寿命,并使高功率的离子电池成为可能.
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:
- 氧化 (Nb2O5) 阳极由于速度能力和安全性,对高功率的离子电池具有前景.
- 低周期稳定性和未揭示的机制阻碍了Nb2O5阳极的实际应用.
研究的目的:
- 为了确定Nb2O5阳极容量损失背后的机制.
- 开发一种提高Nb2O5阳极循环稳定的策略.
- 为了创建一个新的阳极材料,用于先进的能量存储.
主要方法:
- 证明Nb5+过度减少是导致产能减弱的原因.
- 将纳入Nb2O5中,形成一个VNbO4阳极.
- 在离子电池和电容器中对VNbO4阳极进行电化学测试.
主要成果:
- VNbO4阳极表现出可逆的V3+/V2+氧化还原对,抑制了Nb5+过度还原.
- 在VNbO4中增强的电子迁移改善了内在电子导电性.
- VNbO4在0.1 A g-1下提供了206.1 mAh g-1,在1.0 A g-1下2000个循环后保留了93.4%,在1.0 A g-1下保持了206.1 mAh g-1.
- 组装的离子电容器实现了44Wh kg-1 在5.8kW kg-1.
结论:
- 过度减少Nb5+是Nb2O5阳极容量损失的主要原因.
- 使用具有竞争力的氧化还原策略的VNbO4阳极显著提高了循环稳定性和性能.
- 这项工作为设计下一代能源存储的超快速和耐用阳极提供了洞察力.
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