通过Na+/空隙排序和稳定离子存储通过过渡金属蜂排序来实现意想不到的高工作电压
Yao Wang1, Junteng Jin1, Xudong Zhao2,3
1Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
这项研究表明,在分层氧化物阴极中控制的离子/空位排序可以提高工作电压和能量密度. 这一突破为开发耐用,高性能离子电池提供了新的途径.
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:
- 在多层氧化物阴极中,离子/空隙排序通常与结构稳定性降低和较慢的离子扩散有关.
- 这种订单的潜在好处在很大程度上在先进的阴极材料的开发中未被探索.
研究的目的:
- 为了研究Na+/空位排序在离子分层氧化物阴极中的未开发的优势.
- 开发一种具有优化双排序的正极材料,以提高电化学性能.
主要方法:
- 一种P2-Na0.8Cu0.22Li0.08Mn0.67O2 (NCLMO-12h) 材料的合成,具有受控的Na+/空位和过渡金属 (TM) 蜂顺序.
- 电化学表征包括静电循环和in situ/ex situ分析.
- 使用先进的表征技术进行结构和化学状态分析.
主要成果:
- NCLMO-12h阴极显示了中度的Na+/空位和TM蜂巢排序,增强了工作电压和结构完整性.
- 与无序材料相比,双排序的NCLMO-12h显示了增强的工作电压 (3.51V),~20%更高的能量密度,以及出色的循环稳定性 (在500个循环后保持86.5%).
- 解决了固体溶液反应,接近"零应变"的行为,特定电荷补偿机制和可逆的Li迁移.
结论:
- 控制的Na+/空位排序可能是有益的,打破了对其有害影响的传统理解.
- 这些发现为设计高能和长寿命的离子层氧化物阴极提供了一种新的策略.
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