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Chemical presodiation of alloy anodes with improved initial coulombic efficiencies for the advanced sodium-ion batteries.
- Source :
-
Journal of Applied Electrochemistry . Jan2023, Vol. 53 Issue 1, p9-18. 10p. - Publication Year :
- 2023
-
Abstract
- The alloy-type anodes such as P and Sn with high specific capacities are the rising stars for developing advanced sodium-ion batteries (SIBs). However, the low initial coulombic efficiency (ICE) due to the solid electrolyte interphase (SEI) formation and the large volume variation during sodiation/desodiation cycling still limit their practical application. This study reports a facile chemical presodiation method for P and Sn anodes using the sodium biphenyl/tetrahydrofuran (Na-Bp/THF) solution as the presodiation reagent. With a low redox potential of 0.095 V vs. Na/Na+, the Na-Bp/THF reagent is capable of preinserting Na+ into these anodes and compensating for the initial capacity loss. Through adjusting the treatment duration, the degree of presodiation could be feasibly controlled, and the initial CE of a P/C electrode could be significantly increased from 64 to 94%. Surface morphology characterization reveals a more robust NaF-rich SEI layer formed on the presodiated P/C electrode after cycling, which helps to preserve the integrity of the P/C electrode and enables a better cycling performance. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANODES
*SODIUM ions
*SOLID electrolytes
*SURFACE analysis
*REDUCTION potential
*TIN
Subjects
Details
- Language :
- English
- ISSN :
- 0021891X
- Volume :
- 53
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Electrochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 161102664
- Full Text :
- https://doi.org/10.1007/s10800-022-01754-2