将多余的Na注入P2型分层氧化物阴极中,以在Na-Ion全细胞中实现预化
Kai Fang1, Yonglin Tang1, Junjie Liu1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.
Nano letters
|July 13, 2023
概括
这项研究引入了一种预化策略,通过补偿初始的损失来提高离子全细胞容量. 这种方法提高了P2型阴极的特定容量和能量密度.
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:
- 阴极中的初始 (Na) 损失限制了Na-离子全电池的特定容量,特别是对于Na-缺乏的P2型材料.
- 补偿这种不可逆转的Na损失对于提高能量密度和性能至关重要.
研究的目的:
- 开发和评估P2型阴极的预化策略,以克服初始的Na损失.
- 为了提高Na-ion全电池的特定容量和能量密度.
主要方法:
- 电化学预化被用来将0.32的过剩活性Na注入P2型Na0.67Li0.1Fe0.37Mn0.53O2 (NLFMO) 阴极中.
- 研究了在硬碳 (HC) 下的预化NLFMO阴极的结构变化和电化学性能.
主要成果:
- 预化将NLFMO结构从P2转换为P'2,而不会影响随后的循环稳定性.
- 预先化HC水底下载者NLFMOpreNa全电池实现了125 mAh/g的特异容量,明显高于非预先化电池的61 mAh/g.
- 预化策略展示了通过替代工程方法 (如Na-metal contact) 的可扩展性潜力.
结论:
- 拟议的预化策略有效地弥补了Na-ion全电池中的初始Na损失.
- 这种方法提供了一种可行的方法来增加离子电池的特定容量和能量密度,特别是那些使用缺乏阴极的电池.
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