在O3型过渡金属氧化物阴极中的负格子扩展,用于高度稳定的离子电池
Tong Zhang1, Meng Ren1, Yaohui Huang1
1Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, 300071, Tianjin, China.
Angewandte Chemie (International ed. in English)
|January 3, 2024
概括
这项研究揭示了新型离子电池阴极Na$_{0.9}$Ni$_{0.32}$Zn$_{0.08}$Fe$_{0.1}$Mn$_{0.3}$Ti$_{0.2}$O$_{2}$的负格子扩张,使P3→OP2相位过渡能够提高循环稳定性.
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
- 固态化学 固态化学
背景情况:
- 离子电池的多层过渡金属氧化物 (TMO) 阴极由于离子提取/插入过程中的晶格变化而遭受微观结构降解和容量衰减.
- 在这些材料中,轻微的滑动和显著的体积变化是常见的问题,限制了它们的实际应用.
研究的目的:
- 研究一种新型O3型Ni基分层阴极材料的结构演变和电化学性能.
- 了解网格膨胀/收缩背后的机制及其对离子电池循环稳定性的影响.
主要方法:
- 合成和表征 Na$_{0.9}$Ni$_{0.32}$Zn$_{0.08}$Fe$_{0.1}$Mn$_{0.3}$Ti$_{0.2}$O$_{2}$ 阴极材料. 这是一个很好的方法.
- 现场/外现场电化学分析和结构研究 (例如,X射线衍射) 以监测循环期间的相变和晶格变化.
- 袋式离子电池电池的制造和测试.
主要成果:
- 在离子提取时观察到负格子扩张,归因于弱的Zn-O杂交和增强的介层O-O排斥.
- 确定了P3→OP2间生长阶段过渡,减轻了晶格应变,导致体积变化最小 (2.4%的板间间距,总体1.9%).
- 经过3600个循环后,表现出极好的循环稳定性,具有144.9mAh的高特异性容量和93%的容量保留.
结论:
- 开发的基于Ni的分层阴极表现出了显著的结构稳定性和电化学性能,这是由于负格子膨胀和相位过渡.
- 这些发现为设计用于离子电池的高性能分层氧化物阴极提供了一个有希望的策略.
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