Back to Search
Start Over
Revealing Na+‐coordination induced Failure Mechanism of Metal Sulfide Anode for Sodium Ion Batteries.
- Source :
- Angewandte Chemie International Edition; Jul2024, Vol. 63 Issue 27, p1-11, 11p
- Publication Year :
- 2024
-
Abstract
- Metal sulfide (MS) is regarded as a promising candidate of the anode materials for sodium‐ion battery (SIB) with ideal capacity and low cost, yet still suffers from the inferior cycling stability and voltage degradation. Herein, the coordination relationship between the discharge product Na2S with the Na+ (NaPF6) in the electrolyte, is revealed as the root cause for the cycling failure of MS. Na+‐coordination effect assistants the dissolution of Na2S, further delocalizing Na2S from the reaction interface under the function of electric field, which leads to the solo oxidation of the discharge product element metal without the participation of Na2S. Besides, the higher highest occupied molecular orbital of Na2S suggest the facilitated Na2S solo oxidation to produce sodium polysulfides (NaPSs). Based on these, lowering the Na+ concentration of the electrolyte is proposed as a potential improvement strategy to change the coordination environment of Na2S, suppressing the side reactions of the solo‐oxidation of element metal and Na2S. Consequently, the enhanced conversion reaction reversibility and prolonged cycle life are achieved. This work renders in‐depth perception of failure mechanism and inspiration for realizing advanced conversion‐type anode. [ABSTRACT FROM AUTHOR]
- Subjects :
- METAL sulfides
SODIUM ions
METAL fractures
FRONTIER orbitals
METAL products
ANODES
Subjects
Details
- Language :
- English
- ISSN :
- 14337851
- Volume :
- 63
- Issue :
- 27
- Database :
- Complementary Index
- Journal :
- Angewandte Chemie International Edition
- Publication Type :
- Academic Journal
- Accession number :
- 178094253
- Full Text :
- https://doi.org/10.1002/anie.202403463