High performance of HNaV6O16·4H2O nanobelts for aqueous zinc-ion batteries with in-situ phase transformation by Zn(CF3SO3)2 electrolyte

• 作者: Chao Guan Fang Hu Xin Yu Hai-Lian Chen Gui-Hong Song Kai Zhu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 448-456
• 页数: 9页
• 语种: 英文

摘要

Zn(CF3SO3)2 as an electrolyte has been widely used to improve the electrochemical performance for ZIBs due to that the bulky CF3SO3-can reduce the solvation effect of Zn2+ and promote the ionic diffusion.Herein,we found that Zn(CF3SO3)2 electrolyte can induce different electrochemical mechanisms from ZnSO4 electrolyte.Compared to the ZnSO4 electrolyte,the HNaV6O16·4H2O electrode with Zn(CF3SO3)2 electrolyte exhibits a high capacity of 444 mAh·g-1 at 500 mA·g-1 with a capacity retention of 92.3％ after 80 cycles.Even,at a high rate of 5 A·g-1,the HNaV6O16·4H2O electrode delivers an initial discharge capacity of 328 mAh·g-1 with a capacity reten-tion of 93.7％ after 1000 cycles.Differing from the mechanism with ZnSO4 electrolyte,the excellent cycle stability of HNaV6O16·4H2O electrode can be attributed to the in-situ phase transformation to ZnxV2O5·nH2O based on the co-intercalation of Zn2+/H+.