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- Title
Sorbitol-Electrolyte-Additive Based Reversible Zinc Electrochemistry.
- Authors
Qiong Sun; Hai-Hui Du; Tian-Jiang Sun; Dian-Tao Li; Min Cheng; Jing Liang; Hai-Xia Li; Zhan-Liang Tao
- Abstract
The unstable zinc (Zn)/electrolyte interfaces formed by undesired dendrites and parasitic side reactions greatly hinder the development of aqueous zinc ion batteries. Herein, the hydroxy-rich sorbitol was used as an additive to reshape the solvation structure and modulate the interface chemistry. The strong interactions among sorbitol and both water molecules and Zn electrode can reduce the free water activity, optimize the solvation shell of water and Zn2+ ions, and regulate the formation of local water (H2O)-poor environment on the surface of Zn electrode, which effectively inhibit the decomposition of water molecules, and thus, achieve the thermodynamically stable and highly reversible Zn electrochemistry. As a result, the assembled Zn/Zn symmetric cells with the sorbitol additive realized an excellent cycling life of 2000 h at 1 mA·cm–2 and 1 mAh·cm–2, and over 250 h at 5 mA·cm–2 and 5 mAh·cm–2. Moreover, the Zn/Cu asymmetric cells with the sorbitol additive achieved a high Coulombic efficiency of 99.6%, obtaining a better performance than that with a pure 2 mol·L–1 ZnSO4 electrolyte. And the constructed Zn/poly1, 5-naphthalenediamine (PNDA) batteries could be stably discharged for 2300 cycles at 1 A·g–1 with an excellent capacity retention rate. This result indicates that the addition of 1 mol·L–1 non-toxic sorbitol into a conventional ZnSO4 electrolyte can successfully protect the Zn anode interface by improving the electrochemical properties of Zn reversible deposition/decomposition, which greatly promotes its cycle performance, providing a new approach in future development of high performance aqueous Zn ion batteries.
- Subjects
ELECTROCHEMISTRY; SOLVATION; THERMODYNAMICS; SORBITOL; ELECTROLYTES
- Publication
Journal of Electrochemistry, 2024, Vol 30, Issue 7, p1
- ISSN
1006-3471
- Publication type
Article
- DOI
10.61558/2993-074X.3447