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Single Cobalt Atoms Decorated N-doped Carbon Polyhedron Enabled Dendrite-Free Sodium Metal Anode
Small Methods ( IF 10.7 ) Pub Date : 2021-09-17 , DOI: 10.1002/smtd.202100833
Yijuan Li 1 , Pan Xu 2 , Jirong Mou 3 , Shoufeng Xue 3 , Shaoming Huang 1 , Junhua Hu 4 , Quanfeng Dong 2 , Chenghao Yang 3 , Meilin Liu 5
Affiliation  

Uncontrollable growth of sodium dendrites during the sodium deposition and stripping processes remains a huge challenge for achieving high-performance sodium metal batteries (SMBs), which results in ineffective utilization of metallic Na, low Coulombic efficiency, and inferior cycling life. Here, a single Co atom uniformly decorated porous nitrogen-doped carbon polyhedron (CoSA@NC) matrix has been fabricated and introduced to control the Na growth and achieve uniform Na nucleation/deposition. Cryo-electron microscopy and in situ optical microscopy techniques have been utilized to analyze the morphology change of metallic Na during plating/stripping processes. The single Co atoms evenly embedded in NC electrodes can provide stable Na-philic sites for Na ions adsorption, which is helpful to guide the uniform sodium deposition and prevent Na dendrites growth. This work thus provides an effective solution to inhibit Na dendrite growth and control Na nucleation behavior from the perspective of atomic level, towards the fabrication of high-safety and long-cycling SMBs.

中文翻译:

单钴原子装饰的 N 掺杂碳多面体启用无枝晶钠金属阳极

在钠沉积和剥离过程中钠枝晶的不可控生长仍然是实现高性能钠金属电池(SMB)的巨大挑战,这导致金属钠的利用率低、库仑效率低和循环寿命差。在这里,单个 Co 原子均匀修饰多孔氮掺杂碳多面体(Co SA@NC) 矩阵已被制造并引入以控制 Na 生长并实现均匀的 Na 成核/沉积。低温电子显微镜和原位光学显微镜技术已被用于分析金属钠在电镀/剥离过程中的形态变化。均匀嵌入NC电极中的单个Co原子可以为Na离子吸附提供稳定的亲钠位点,有助于引导钠的均匀沉积,防止钠枝晶的生长。因此,这项工作为从原子水平的角度抑制钠枝晶生长和控制钠成核行为提供了一种有效的解决方案,以制备高安全性和长循环的 SMB。
更新日期:2021-11-12
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