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通过V2O5的双离子间隙大幅提升速率能力,使离子快速存储成为可能
Dongmei Dai1, Ying Chen2, Bao Li1,3
1Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions (Ministry of Education), School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|November 30, 2024
概括
研究人员使用双离子策略增强了水性离子电池 (AZIB). 氧化 (V2O5) 中的和离子提高了先进的储能电极性能,容量和稳定性.
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:
- 分层氧化 (V2O5) 是水性离子电池 (AZIB) 的一个有前途的阴极.
- 挑战包括结构脆弱性和缓慢的Zn2+离子迁移,限制电池性能.
- 强大的静电相互作用阻碍了V2O5阴极中的有效离子传输.
研究的目的:
- 为了提高AZIB中的V2O5基阴极的性能.
- 为了克服缓慢的Zn2+迁移和结构不稳定的局限性.
- 探索使用Mn2+和Zn2+的双联策略.
主要方法:
- 通过双离子间置策略合成 (Mn0.13Zn0.03) V2O5 (MZVO) 材料.
- 使用循环电压测量和静电电荷-放电循环研究了电化学性能.
- 利用密度函数理论 (DFT) 计算来理解离子迁移机制.
- 运用X射线衍射 (XRD) 来阐明反应机制.
主要成果:
- MZVO电极在0.1 A g-1下实现了463 mAh g-1的高可逆容量.
- 经过1000次10A g-1循环后,表现出极好的循环稳定性,94%的容量保持率.
- 展示了卓越的速率能力,在20 A g-1下提供256 mAh g-1.
- DFT的计算证实了Mn2+增强的Zn2+迁移和Zn2+改善的结构稳定性.
- 操作XRD揭示了Zn2+插入/提取过程中的两相反应机制.
结论:
- 双离子策略有效地提高了AZIBs的V2O5阴极性能.
- MZVO提供了一个强大而高效的阴极材料,用于高性能水性储能.
- 这项工作为设计用于未来电池应用的改性层状金属氧化物提供了洞察力.
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