在V2PS10的Mg-Ion储存中通过选择性键裂解的联合阴离子-阴离子氧化还原来获得访问
Matthew A Wright1,2, T Wesley Surta1, Jae A Evans1
1Department of Chemistry, University of Liverpool, L69 7ZD, Liverpool, UK.
Angewandte Chemie (International ed. in English)
|March 6, 2024
概括
研究人员开发了一种新的阴极材料V2PS10,用于可充电电池. 这种材料能够实现快速的离子扩散和高容量,克服了电池开发的先前限制.
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:
- 电池由于的丰富性和高能量密度潜力,对储能充满希望.
- 由于缺乏合适的阴极和缓慢的离子扩散动力学,发展受到阻碍.
- 2+与宿主结构之间的强烈相互作用阻碍了有效的离子运输.
研究的目的:
- 推出V2PS10作为可充电电池的新型正极材料.
- 调查V2PS10.10中快速离子扩散背后的机制.
- 了解电池性能中阴离子和阴离子氧化还原过程的作用.
主要方法:
- 电化学测试以确定可循环容量和离子扩散率.
- X射线光电子光谱 (XPS) 和X射线吸收光谱 (XAS) 来识别氧化还原机制.
- 最大方法 (MEM) 分析,密度函数理论 (DFT) 和预测状态密度 (PDOS) 用于结构和电子表征.
主要成果:
- V2PS10实现了100 mAh g-1的可循环容量,并具有快速的Mg2+扩散 (7.2 x 10^-11到4 x 10^-14 cm2 s-1).
- 快速插入机制归因于通过可逆S-S键裂变的V位子阴离子还氧化和 (S2) 2-位子阳离子还氧化.
- 结构分析显示空间分离的阴离子和阳离子氧化还原过程,促进可逆的Mg插入.
结论:
- V2PS10显示出作为高性能电池的阴极材料的巨大潜力.
- 独特的氧化还原机制涉及S-S键裂变和空间分离的氧化还原点,使Mg2+的快速运输成为可能.
- 在Mg位点占用和电子转移位置之间的协同效应提高了电池的性能.
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