过渡金属空隙和位置工程使得可逆的阳离子氧化还原反应用于储存
Congcong Cai1, Xinyuan Li1, Jiantao Li2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China.
Nature communications
|January 3, 2025
概括
带有离子和空缺的双注射层过渡金属氧化物增强了阳离子氧化还原反应和结构稳定性,从而提高了储存能力. 这一策略通过创建特定的轨道配置和固定离子来防止材料降解来提高性能.
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:
- 在分层过渡金属氧化物中的阳离子氧化还原反应可以显著增加能量储存能力.
- 然而,挑战包括不可逆转的氧气释放和高电压的结构不稳定性,限制了实际应用.
研究的目的:
- 开发一种新的兴奋剂策略,以提高阴离子氧化还原反应的可逆性,并改善用于储存的分层氧化物的结构稳定性.
- 调查双Mg离子和空位兴奋剂以及部分过渡金属离子迁移对电化学性能的影响.
主要方法:
- 合成了一种新的分层氧化物材料,Na 0.67 Mn 0.011 [Mg 0.1 □ 0.07 Mn 0.83 ]O 2 ,使用双重兴奋剂方法.
- 描述了材料的结构和电化学特性,重点关注阳离子氧化还原行为和循环稳定性.
- 利用理论见解来解释Mg离子,空位和固定Mn离子在提高性能方面的作用.
主要成果:
- 离子和空位的双重兴奋剂策略成功地创造了无结合的O2p轨道,促进了高氧氧氧还氧化能力.
- 部分Mn离子迁移到Na位点起到了"子"的作用,在深度化过程中有效地抑制了板块滑动和裂形成.
- 与未使用片的对应物相比,经过修改的电极材料表现出更强的放电能力和更好的循环利用性.
结论:
- 开发的兴奋剂策略为设计稳定的分层氧化物电极提供了一个有前途的途径,用于先进的储存,具有高度可逆的阴离子氧化还原反应.
- 这项工作提供了通过战略性离子和空隙兴奋剂来控制阴离子氧化还原活性和分层材料的结构完整性的基本见解.
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