材料科学
电化学
水溶液
化学工程
阳极
电极
电解质
X射线光电子能谱
化学
物理化学
工程类
作者
Anagha Pradeep,Bachu Sravan Kumar,N Abharana,T. Nandakumar,Amartya Mukhopadhyay
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2023-11-01
卷期号:170 (11): 110531-110531
标识
DOI:10.1149/1945-7111/ad0a7f
摘要
In the contexts of easing the handling/storage and facilitating “aqueous” processing of Na-titanate based electrodes (as potential anodes for Na-ion batteries), the present work compares the compositional/phase/structural stability of Na 2 Ti 3 O 7 , Na 2 Ti 6 O 13 and “Bi-phase NTO” (having ∼72 wt%Na 2 Ti 3 O 7 + ∼28 wt%Na 2 Ti 6 O 13 ) upon being exposed to air and water. This reveals the long-term air/water-stability of Na 2 Ti 6 O 13 and “Bi-phase NTO”, having the Na 2 Ti 6 O 13 component at/closer to particle surface and the Na 2 Ti 3 O 7 component (primarly, at/closer to core) with shrunk lattice parameters; thus, rendering “aqueous” processing of electrodes feasible even for “Bi-phase NTO”, unlike for Na 2 Ti 3 O 7 . Furthermore, the usage of Na-alginate binder, as rendered possible by “aqueous” processing, bestows the “Bi-phase NTO” electrode with vastly superior chemical, mechanical and electrochemical stability, as compared to the usage of PVDF for “non-aqueous” processing. As confirmed by top-view/cross-section electron microscopy, depth-profiling XPS and in-situ / operando stress measurements during rest (post cell-assembly), as well as electrochemical cycling, this is primarily due to the deterioration/decomposition and swelling of PVDF in contact with cyclic carbonate-based electrolyte. Overall, this work reveals that the superior air/water-stability of “Bi-phase NTO” electrodes not only aids in storage/handling, but also facilitates cost-effective and environment/health-friendly “aqueous processing” of Na-titanate based anodes for Na-ion batteries, where the usage of Na-alginate as binder bestows further stability.
科研通智能强力驱动
Strongly Powered by AbleSci AI