通过Na-Site Mg替换离子电池来调整P2结构的阴极材料
Qin-Chao Wang1, Jing-Ke Meng1, Xin-Yang Yue1
1Department of Materials Science , Fudan University , Shanghai , 200433 , People's Republic of China.
Journal of the American Chemical Society
|December 19, 2018
概括
(Mg) 离子通过作为支柱和破坏充电顺序来稳定P2型层氧化物阴极. 这增强了结构稳定性,并促进了可逆氧氧还原,导致更光滑的电压配置和更好的性能.
科学领域:
- 材料科学
- 电化学
- 无机化学
背景情况:
- P2型层氧化物通常在离子电池中表现出多个电压平原.
- 这归因于Na+/空位排序的超结构,由Na-Na静电相互作用和过渡金属电荷排序产生的.
- 这些问题限制了这些正极材料的电化学性能和稳定性.
研究的目的:
- 为提高电化学性能的离子电池设计新的P2型层氧化物阴极材料.
- 研究离子对Na0.7[Mn0.6Ni0.4]O2的结构和电化学特性的影响.
- 促进可逆氧氧化还原并实现平滑的电压配置.
主要方法:
- 用Mg合的P2类层氧化物的合成:Na0.7Mg0.05[Mn0.6Ni0.2Mg0.15]O2.
- 使用X射线衍射 (XRD) 和其他技术进行结构性表征.
- 电化学性能评估,包括循环稳定性,速率能力和电压配置文件.
主要成果:
- 在Na和过渡金属位点引入的Mg离子稳定了分层结构,作为"支柱"并破坏了电荷排序.
- 兴奋剂产生"Na-O-Mg"和"Mg-O-Mg"配置,促进离子O2p特性和可逆氧氧还原.
- 添加材料 (Na0.7Mg0.05[Mn0.6Ni0.2Mg0.15]O2) 具有光滑的电压配置,高结构稳定性,在高速率和高切断电压 (4.2V) 时具有优越的容量保留.
- 在充电后形成新的P2阶段,与未被替代材料中的O2阶段不同.
结论:
- 兴奋剂是一种有效的策略,可以克服P2型层氧化物对离子电池的限制.
- 增强的电化学性能归因于结构稳定和促进氧氧还原活性.
- 这项工作为设计高性能离子电池的先进分层阴极材料开辟了新的途径.
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